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android / platform / external / chromium_org / third_party / WebKit / bfe3590 / . / Source / core / rendering / RenderBox.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "core/rendering/RenderBox.h"
#include <math.h>
#include <algorithm>
#include "HTMLNames.h"
#include "core/dom/Document.h"
#include "core/editing/htmlediting.h"
#include "core/html/HTMLElement.h"
#include "core/html/HTMLFrameOwnerElement.h"
#include "core/html/HTMLHtmlElement.h"
#include "core/html/HTMLTextAreaElement.h"
#include "core/frame/Frame.h"
#include "core/frame/FrameView.h"
#include "core/page/EventHandler.h"
#include "core/page/Page.h"
#include "core/platform/graphics/GraphicsContextStateSaver.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderBoxRegionInfo.h"
#include "core/rendering/RenderFlexibleBox.h"
#include "core/rendering/RenderFlowThread.h"
#include "core/rendering/RenderGeometryMap.h"
#include "core/rendering/RenderGrid.h"
#include "core/rendering/RenderInline.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderLayerCompositor.h"
#include "core/rendering/RenderListMarker.h"
#include "core/rendering/RenderRegion.h"
#include "core/rendering/RenderTableCell.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderView.h"
#include "platform/geometry/FloatQuad.h"
#include "platform/geometry/TransformState.h"
using namespace std;
namespace WebCore {
using namespace HTMLNames;
// Used by flexible boxes when flexing this element and by table cells.
typedef WTF::HashMap<const RenderBox*, LayoutUnit> OverrideSizeMap;
static OverrideSizeMap* gOverrideHeightMap = 0;
static OverrideSizeMap* gOverrideWidthMap = 0;
// Used by grid elements to properly size their grid items.
static OverrideSizeMap* gOverrideContainingBlockLogicalHeightMap = 0;
static OverrideSizeMap* gOverrideContainingBlockLogicalWidthMap = 0;
// Size of border belt for autoscroll. When mouse pointer in border belt,
// autoscroll is started.
static const int autoscrollBeltSize = 20;
static const unsigned backgroundObscurationTestMaxDepth = 4;
bool RenderBox::s_hadOverflowClip = false;
static bool skipBodyBackground(const RenderBox* bodyElementRenderer)
{
ASSERT(bodyElementRenderer->isBody());
// The <body> only paints its background if the root element has defined a background independent of the body,
// or if the <body>'s parent is not the document element's renderer (e.g. inside SVG foreignObject).
RenderObject* documentElementRenderer = bodyElementRenderer->document().documentElement()->renderer();
return documentElementRenderer
&& !documentElementRenderer->hasBackground()
&& (documentElementRenderer == bodyElementRenderer->parent());
}
RenderBox::RenderBox(ContainerNode* node)
: RenderBoxModelObject(node)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
, m_intrinsicContentLogicalHeight(-1)
, m_inlineBoxWrapper(0)
{
setIsBox();
}
RenderBox::~RenderBox()
{
}
LayoutRect RenderBox::borderBoxRectInRegion(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
if (!region)
return borderBoxRect();
// Compute the logical width and placement in this region.
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(region, cacheFlag);
if (!boxInfo)
return borderBoxRect();
// We have cached insets.
LayoutUnit logicalWidth = boxInfo->logicalWidth();
LayoutUnit logicalLeft = boxInfo->logicalLeft();
// Now apply the parent inset since it is cumulative whenever anything in the containing block chain shifts.
// FIXME: Doesn't work right with perpendicular writing modes.
const RenderBlock* currentBox = containingBlock();
RenderBoxRegionInfo* currentBoxInfo = currentBox->renderBoxRegionInfo(region);
while (currentBoxInfo && currentBoxInfo->isShifted()) {
if (currentBox->style()->direction() == LTR)
logicalLeft += currentBoxInfo->logicalLeft();
else
logicalLeft -= (currentBox->logicalWidth() - currentBoxInfo->logicalWidth()) - currentBoxInfo->logicalLeft();
currentBox = currentBox->containingBlock();
region = currentBox->clampToStartAndEndRegions(region);
currentBoxInfo = currentBox->renderBoxRegionInfo(region);
}
if (cacheFlag == DoNotCacheRenderBoxRegionInfo)
delete boxInfo;
if (isHorizontalWritingMode())
return LayoutRect(logicalLeft, 0, logicalWidth, height());
return LayoutRect(0, logicalLeft, width(), logicalWidth);
}
void RenderBox::clearRenderBoxRegionInfo()
{
if (isRenderFlowThread())
return;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->removeRenderBoxRegionInfo(this);
}
void RenderBox::willBeDestroyed()
{
clearOverrideSize();
clearContainingBlockOverrideSize();
RenderBlock::removePercentHeightDescendantIfNeeded(this);
ShapeOutsideInfo::removeInfo(this);
RenderBoxModelObject::willBeDestroyed();
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isFloating()) {
RenderBlock* parentBlock = 0;
for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
if (curr->isRenderBlock()) {
RenderBlock* currBlock = toRenderBlock(curr);
if (!parentBlock || currBlock->containsFloat(this))
parentBlock = currBlock;
}
}
if (parentBlock) {
RenderObject* parent = parentBlock->parent();
if (parent && parent->isFlexibleBoxIncludingDeprecated())
parentBlock = toRenderBlock(parent);
parentBlock->markSiblingsWithFloatsForLayout(this);
parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
s_hadOverflowClip = hasOverflowClip();
RenderStyle* oldStyle = style();
if (oldStyle) {
// The background of the root element or the body element could propagate up to
// the canvas. Just dirty the entire canvas when our style changes substantially.
if (diff >= StyleDifferenceRepaint && node() &&
(isHTMLHtmlElement(node()) || node()->hasTagName(bodyTag))) {
view()->repaint();
if (oldStyle->hasEntirelyFixedBackground() != newStyle->hasEntirelyFixedBackground())
view()->compositor()->rootFixedBackgroundsChanged();
}
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifferenceLayout && parent() && oldStyle->position() != newStyle->position()) {
markContainingBlocksForLayout();
if (oldStyle->position() == StaticPosition)
repaint();
else if (newStyle->hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
if (isFloating() && !isOutOfFlowPositioned() && newStyle->hasOutOfFlowPosition())
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (newStyle && isBody())
view()->repaint();
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// Horizontal writing mode definition is updated in RenderBoxModelObject::updateFromStyle,
// (as part of the RenderBoxModelObject::styleDidChange call below). So, we can safely cache the horizontal
// writing mode value before style change here.
bool oldHorizontalWritingMode = isHorizontalWritingMode();
RenderBoxModelObject::styleDidChange(diff, oldStyle);
RenderStyle* newStyle = style();
if (needsLayout() && oldStyle) {
RenderBlock::removePercentHeightDescendantIfNeeded(this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isOutOfFlowPositioned() && newStyle->hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != newStyle->marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
if (RenderBlock::hasPercentHeightContainerMap() && firstChild()
&& oldHorizontalWritingMode != isHorizontalWritingMode())
RenderBlock::clearPercentHeightDescendantsFrom(this);
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasOverflowClip() && oldStyle && newStyle && oldStyle->effectiveZoom() != newStyle->effectiveZoom() && layer()) {
if (int left = layer()->scrollableArea()->scrollXOffset()) {
left = (left / oldStyle->effectiveZoom()) * newStyle->effectiveZoom();
layer()->scrollableArea()->scrollToXOffset(left);
}
if (int top = layer()->scrollableArea()->scrollYOffset()) {
top = (top / oldStyle->effectiveZoom()) * newStyle->effectiveZoom();
layer()->scrollableArea()->scrollToYOffset(top);
}
}
// Our opaqueness might have changed without triggering layout.
if (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfTextOrColorChange || diff == StyleDifferenceRepaintLayer) {
RenderObject* parentToInvalidate = parent();
for (unsigned i = 0; i < backgroundObscurationTestMaxDepth && parentToInvalidate; ++i) {
parentToInvalidate->invalidateBackgroundObscurationStatus();
parentToInvalidate = parentToInvalidate->parent();
}
}
if (isRoot() || isBody())
document().view()->recalculateScrollbarOverlayStyle();
updateShapeOutsideInfoAfterStyleChange(*style(), oldStyle);
updateGridPositionAfterStyleChange(oldStyle);
}
void RenderBox::updateShapeOutsideInfoAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
const ShapeValue* shapeOutside = style.shapeOutside();
const ShapeValue* oldShapeOutside = oldStyle ? oldStyle->shapeOutside() : RenderStyle::initialShapeOutside();
Length shapeMargin = style.shapeMargin();
Length oldShapeMargin = oldStyle ? oldStyle->shapeMargin() : RenderStyle::initialShapeMargin();
// FIXME: A future optimization would do a deep comparison for equality. (bug 100811)
if (shapeOutside == oldShapeOutside && shapeMargin == oldShapeMargin)
return;
if (!shapeOutside)
ShapeOutsideInfo::removeInfo(this);
else
ShapeOutsideInfo::ensureInfo(this)->dirtyShapeSize();
if (shapeOutside || shapeOutside != oldShapeOutside)
markShapeOutsideDependentsForLayout();
}
void RenderBox::updateGridPositionAfterStyleChange(const RenderStyle* oldStyle)
{
if (!oldStyle || !parent() || !parent()->isRenderGrid())
return;
if (oldStyle->gridColumnStart() == style()->gridColumnStart()
&& oldStyle->gridColumnEnd() == style()->gridColumnEnd()
&& oldStyle->gridRowStart() == style()->gridRowStart()
&& oldStyle->gridRowEnd() == style()->gridRowEnd()
&& oldStyle->order() == style()->order()
&& oldStyle->hasOutOfFlowPosition() == style()->hasOutOfFlowPosition())
return;
// It should be possible to not dirty the grid in some cases (like moving an explicitly placed grid item).
// For now, it's more simple to just always recompute the grid.
toRenderGrid(parent())->dirtyGrid();
}
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
RenderStyle* styleToUse = style();
bool isRootObject = isRoot();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isRootObject || isViewObject)
setHasBoxDecorations(true);
setFloating(!isOutOfFlowPositioned() && styleToUse->isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (styleToUse->overflowX() != OVISIBLE && !isRootObject && isRenderBlock()) {
bool boxHasOverflowClip = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
if (isHTMLHtmlElement(document().documentElement())
&& document().body() == node()
&& document().documentElement()->renderer()->style()->overflowX() == OVISIBLE)
boxHasOverflowClip = false;
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasOverflowClip) {
if (!s_hadOverflowClip)
// Erase the overflow
repaint();
setHasOverflowClip();
}
}
setHasTransform(styleToUse->hasTransformRelatedProperty());
setHasReflection(styleToUse->boxReflect());
}
void RenderBox::layout()
{
ASSERT(needsLayout());
RenderObject* child = firstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutStateMaintainer statePusher(view(), this, locationOffset(), style()->isFlippedBlocksWritingMode());
while (child) {
child->layoutIfNeeded();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
statePusher.pop();
invalidateBackgroundObscurationStatus();
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
}
int RenderBox::pixelSnappedClientWidth() const
{
return snapSizeToPixel(clientWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedClientHeight() const
{
return snapSizeToPixel(clientHeight(), y() + clientTop());
}
int RenderBox::pixelSnappedOffsetWidth() const
{
return snapSizeToPixel(offsetWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedOffsetHeight() const
{
return snapSizeToPixel(offsetHeight(), y() + clientTop());
}
bool RenderBox::canDetermineWidthWithoutLayout() const
{
// FIXME: This optimization is incorrect as written.
// We need to be able to opt-in to this behavior only when
// it's guarentted correct.
// Until then disabling this optimization to be safe.
return false;
// FIXME: There are likely many subclasses of RenderBlockFlow which
// cannot determine their layout just from style!
// Perhaps we should create a "PlainRenderBlockFlow"
// and move this optimization there?
if (!isRenderBlockFlow()
// Flexbox items can be expanded beyond their width.
|| isFlexItemIncludingDeprecated()
// Table Layout controls cell size and can expand beyond width.
|| isTableCell())
return false;
RenderStyle* style = this->style();
return style->width().isFixed()
&& style->minWidth().isFixed()
&& (style->maxWidth().isUndefined() || style->maxWidth().isFixed())
&& style->paddingLeft().isFixed()
&& style->paddingRight().isFixed()
&& style->boxSizing() == CONTENT_BOX;
}
LayoutUnit RenderBox::fixedOffsetWidth() const
{
ASSERT(canDetermineWidthWithoutLayout());
RenderStyle* style = this->style();
LayoutUnit width = std::max(LayoutUnit(style->minWidth().value()), LayoutUnit(style->width().value()));
if (style->maxWidth().isFixed())
width = std::min(LayoutUnit(style->maxWidth().value()), width);
LayoutUnit borderLeft = style->borderLeft().nonZero() ? style->borderLeft().width() : 0;
LayoutUnit borderRight = style->borderRight().nonZero() ? style->borderRight().width() : 0;
return width + borderLeft + borderRight + style->paddingLeft().value() + style->paddingRight().value();
}
int RenderBox::scrollWidth() const
{
if (hasOverflowClip())
return layer()->scrollableArea()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style()->isLeftToRightDirection())
return snapSizeToPixel(max(clientWidth(), layoutOverflowRect().maxX() - borderLeft()), x() + clientLeft());
return clientWidth() - min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft());
}
int RenderBox::scrollHeight() const
{
if (hasOverflowClip())
return layer()->scrollableArea()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
return snapSizeToPixel(max(clientHeight(), layoutOverflowRect().maxY() - borderTop()), y() + clientTop());
}
int RenderBox::scrollLeft() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollXOffset() : 0;
}
int RenderBox::scrollTop() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollYOffset() : 0;
}
void RenderBox::setScrollLeft(int newLeft)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped);
}
void RenderBox::setScrollTop(int newTop)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped);
}
void RenderBox::scrollToOffset(const IntSize& offset)
{
ASSERT(hasOverflowClip());
layer()->scrollableArea()->scrollToOffset(offset, ScrollOffsetClamped);
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
rects.append(pixelSnappedIntRect(accumulatedOffset, size()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
quads.append(localToAbsoluteQuad(FloatRect(0, 0, width(), height()), 0 /* mode */, wasFixed));
}
void RenderBox::updateLayerTransform()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransform();
}
LayoutUnit RenderBox::constrainLogicalWidthInRegionByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb, RenderRegion* region) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxWidth().isUndefined())
logicalWidth = min(logicalWidth, computeLogicalWidthInRegionUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb, region));
return max(logicalWidth, computeLogicalWidthInRegionUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb, region));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeLogicalHeightUsing(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = min(logicalHeight, maxH);
}
return max(logicalHeight, computeLogicalHeightUsing(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeContentLogicalHeight(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = min(logicalHeight, maxH);
}
return max(logicalHeight, computeContentLogicalHeight(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = pixelSnappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
{
LayoutRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
if (repaintContainer != this) {
FloatQuad containerRelativeQuad;
if (geometryMap)
containerRelativeQuad = geometryMap->mapToContainer(box, repaintContainer);
else
containerRelativeQuad = localToContainerQuad(FloatRect(box), repaintContainer);
box = containerRelativeQuad.enclosingBoundingBox();
}
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view()->layoutDelta());
return box;
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*)
{
if (!size().isEmpty())
rects.append(pixelSnappedIntRect(additionalOffset, size()));
}
bool RenderBox::canResize() const
{
// We need a special case for <iframe> because they never have
// hasOverflowClip(). However, they do "implicitly" clip their contents, so
// we want to allow resizing them also.
return (hasOverflowClip() || isRenderIFrame()) && style()->resize() != RESIZE_NONE;
}
void RenderBox::addLayerHitTestRects(LayerHitTestRects& layerRects, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const
{
LayoutPoint adjustedLayerOffset = layerOffset + locationOffset();
RenderBoxModelObject::addLayerHitTestRects(layerRects, currentLayer, adjustedLayerOffset, containerRect);
}
void RenderBox::computeSelfHitTestRects(Vector<LayoutRect>& rects, const LayoutPoint& layerOffset) const
{
if (!size().isEmpty())
rects.append(LayoutRect(layerOffset, size()));
}
LayoutRect RenderBox::reflectionBox() const
{
LayoutRect result;
if (!style()->boxReflect())
return result;
LayoutRect box = borderBoxRect();
result = box;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.move(0, box.height() + reflectionOffset());
break;
case ReflectionAbove:
result.move(0, -box.height() - reflectionOffset());
break;
case ReflectionLeft:
result.move(-box.width() - reflectionOffset(), 0);
break;
case ReflectionRight:
result.move(box.width() + reflectionOffset(), 0);
break;
}
return result;
}
int RenderBox::reflectionOffset() const
{
if (!style()->boxReflect())
return 0;
RenderView* renderView = view();
if (style()->boxReflect()->direction() == ReflectionLeft || style()->boxReflect()->direction() == ReflectionRight)
return valueForLength(style()->boxReflect()->offset(), borderBoxRect().width(), renderView);
return valueForLength(style()->boxReflect()->offset(), borderBoxRect().height(), renderView);
}
LayoutRect RenderBox::reflectedRect(const LayoutRect& r) const
{
if (!style()->boxReflect())
return LayoutRect();
LayoutRect box = borderBoxRect();
LayoutRect result = r;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionAbove:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionLeft:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionRight:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
int RenderBox::verticalScrollbarWidth() const
{
if (!hasOverflowClip() || style()->overflowY() == OOVERLAY)
return 0;
return layer()->scrollableArea()->verticalScrollbarWidth();
}
int RenderBox::horizontalScrollbarHeight() const
{
if (!hasOverflowClip() || style()->overflowX() == OOVERLAY)
return 0;
return layer()->scrollableArea()->horizontalScrollbarHeight();
}
int RenderBox::instrinsicScrollbarLogicalWidth() const
{
if (!hasOverflowClip())
return 0;
if (isHorizontalWritingMode() && style()->overflowY() == OSCROLL) {
ASSERT(layer()->scrollableArea() && layer()->scrollableArea()->hasVerticalScrollbar());
return verticalScrollbarWidth();
}
if (!isHorizontalWritingMode() && style()->overflowX() == OSCROLL) {
ASSERT(layer()->scrollableArea() && layer()->scrollableArea()->hasHorizontalScrollbar());
return horizontalScrollbarHeight();
}
return 0;
}
bool RenderBox::scrollImpl(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
RenderLayer* l = layer();
return l && l->scroll(direction, granularity, multiplier);
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
if (scrollImpl(direction, granularity, multiplier)) {
if (stopNode)
*stopNode = node();
return true;
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->scroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
if (scrollImpl(logicalToPhysical(direction, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()),
granularity, multiplier)) {
if (stopNode)
*stopNode = node();
return true;
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (scrollHeight() != clientHeight() || scrollWidth() != clientWidth());
}
bool RenderBox::canBeProgramaticallyScrolled() const
{
Node* node = this->node();
if (node && node->isDocumentNode())
return true;
if (!hasOverflowClip())
return false;
bool hasScrollableOverflow = hasScrollableOverflowX() || hasScrollableOverflowY();
if (scrollsOverflow() && hasScrollableOverflow)
return true;
return node && node->rendererIsEditable();
}
bool RenderBox::usesCompositedScrolling() const
{
return hasOverflowClip() && hasLayer() && layer()->usesCompositedScrolling();
}
void RenderBox::autoscroll(const IntPoint& position)
{
if (layer())
layer()->autoscroll(position);
}
bool RenderBox::autoscrollInProgress() const
{
return frame() && frame()->page() && frame()->page()->autoscrollInProgress(this);
}
// There are two kinds of renderer that can autoscroll.
bool RenderBox::canAutoscroll() const
{
if (node() && node()->isDocumentNode())
return view()->frameView()->isScrollable();
// Check for a box that can be scrolled in its own right.
return canBeScrolledAndHasScrollableArea();
}
// If specified point is in border belt, returned offset denotes direction of
// scrolling.
IntSize RenderBox::calculateAutoscrollDirection(const IntPoint& windowPoint) const
{
if (!frame())
return IntSize();
FrameView* frameView = frame()->view();
if (!frameView)
return IntSize();
IntRect box(absoluteBoundingBoxRect());
box.move(view()->frameView()->scrollOffset());
IntRect windowBox = view()->frameView()->contentsToWindow(box);
IntPoint windowAutoscrollPoint = windowPoint;
if (windowAutoscrollPoint.x() < windowBox.x() + autoscrollBeltSize)
windowAutoscrollPoint.move(-autoscrollBeltSize, 0);
else if (windowAutoscrollPoint.x() > windowBox.maxX() - autoscrollBeltSize)
windowAutoscrollPoint.move(autoscrollBeltSize, 0);
if (windowAutoscrollPoint.y() < windowBox.y() + autoscrollBeltSize)
windowAutoscrollPoint.move(0, -autoscrollBeltSize);
else if (windowAutoscrollPoint.y() > windowBox.maxY() - autoscrollBeltSize)
windowAutoscrollPoint.move(0, autoscrollBeltSize);
return windowAutoscrollPoint - windowPoint;
}
RenderBox* RenderBox::findAutoscrollable(RenderObject* renderer)
{
while (renderer && !(renderer->isBox() && toRenderBox(renderer)->canAutoscroll())) {
if (!renderer->parent() && renderer->node() == renderer->document() && renderer->document().ownerElement())
renderer = renderer->document().ownerElement()->renderer();
else
renderer = renderer->parent();
}
return renderer && renderer->isBox() ? toRenderBox(renderer) : 0;
}
static inline int adjustedScrollDelta(int beginningDelta)
{
// This implemention matches Firefox's.
// http://mxr.mozilla.org/firefox/source/toolkit/content/widgets/browser.xml#856.
const int speedReducer = 12;
int adjustedDelta = beginningDelta / speedReducer;
if (adjustedDelta > 1)
adjustedDelta = static_cast<int>(adjustedDelta * sqrt(static_cast<double>(adjustedDelta))) - 1;
else if (adjustedDelta < -1)
adjustedDelta = static_cast<int>(adjustedDelta * sqrt(static_cast<double>(-adjustedDelta))) + 1;
return adjustedDelta;
}
static inline IntSize adjustedScrollDelta(const IntSize& delta)
{
return IntSize(adjustedScrollDelta(delta.width()), adjustedScrollDelta(delta.height()));
}
void RenderBox::panScroll(const IntPoint& sourcePoint)
{
Frame* frame = this->frame();
if (!frame)
return;
IntPoint lastKnownMousePosition = frame->eventHandler()->lastKnownMousePosition();
// We need to check if the last known mouse position is out of the window. When the mouse is out of the window, the position is incoherent
static IntPoint previousMousePosition;
if (lastKnownMousePosition.x() < 0 || lastKnownMousePosition.y() < 0)
lastKnownMousePosition = previousMousePosition;
else
previousMousePosition = lastKnownMousePosition;
IntSize delta = lastKnownMousePosition - sourcePoint;
if (abs(delta.width()) <= ScrollView::noPanScrollRadius) // at the center we let the space for the icon
delta.setWidth(0);
if (abs(delta.height()) <= ScrollView::noPanScrollRadius)
delta.setHeight(0);
scrollByRecursively(adjustedScrollDelta(delta), ScrollOffsetClamped);
}
void RenderBox::scrollByRecursively(const IntSize& delta, ScrollOffsetClamping clamp)
{
if (delta.isZero())
return;
bool restrictedByLineClamp = false;
if (parent())
restrictedByLineClamp = !parent()->style()->lineClamp().isNone();
if (hasOverflowClip() && !restrictedByLineClamp) {
IntSize newScrollOffset = layer()->scrollableArea()->adjustedScrollOffset() + delta;
layer()->scrollableArea()->scrollToOffset(newScrollOffset, clamp);
// If this layer can't do the scroll we ask the next layer up that can scroll to try
IntSize remainingScrollOffset = newScrollOffset - layer()->scrollableArea()->adjustedScrollOffset();
if (!remainingScrollOffset.isZero() && parent()) {
if (RenderBox* scrollableBox = enclosingScrollableBox())
scrollableBox->scrollByRecursively(remainingScrollOffset, clamp);
Frame* frame = this->frame();
if (frame && frame->page())
frame->page()->updateAutoscrollRenderer();
}
} else if (view()->frameView()) {
// If we are here, we were called on a renderer that can be programmatically scrolled, but doesn't
// have an overflow clip. Which means that it is a document node that can be scrolled.
view()->frameView()->scrollBy(delta);
// FIXME: If we didn't scroll the whole way, do we want to try looking at the frames ownerElement?
// https://bugs.webkit.org/show_bug.cgi?id=28237
}
}
bool RenderBox::needsPreferredWidthsRecalculation() const
{
return style()->paddingStart().isPercent() || style()->paddingEnd().isPercent();
}
IntSize RenderBox::scrolledContentOffset() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->scrollableArea()->scrollOffset();
}
LayoutSize RenderBox::cachedSizeForOverflowClip() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->size();
}
void RenderBox::applyCachedClipAndScrollOffsetForRepaint(LayoutRect& paintRect) const
{
paintRect.move(-scrolledContentOffset()); // For overflow:auto/scroll/hidden.
// Do not clip scroll layer contents to reduce the number of repaints while scrolling.
if (usesCompositedScrolling())
return;
// height() is inaccurate if we're in the middle of a layout of this RenderBox, so use the
// layer's size instead. Even if the layer's size is wrong, the layer itself will repaint
// anyway if its size does change.
LayoutRect clipRect(LayoutPoint(), cachedSizeForOverflowClip());
paintRect = intersection(paintRect, clipRect);
}
void RenderBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
minLogicalWidth = minPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
maxLogicalWidth = maxPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
}
LayoutUnit RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_minPreferredLogicalWidth;
}
LayoutUnit RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_maxPreferredLogicalWidth;
}
bool RenderBox::hasOverrideHeight() const
{
return gOverrideHeightMap && gOverrideHeightMap->contains(this);
}
bool RenderBox::hasOverrideWidth() const
{
return gOverrideWidthMap && gOverrideWidthMap->contains(this);
}
void RenderBox::setOverrideLogicalContentHeight(LayoutUnit height)
{
if (!gOverrideHeightMap)
gOverrideHeightMap = new OverrideSizeMap();
gOverrideHeightMap->set(this, height);
}
void RenderBox::setOverrideLogicalContentWidth(LayoutUnit width)
{
if (!gOverrideWidthMap)
gOverrideWidthMap = new OverrideSizeMap();
gOverrideWidthMap->set(this, width);
}
void RenderBox::clearOverrideLogicalContentHeight()
{
if (gOverrideHeightMap)
gOverrideHeightMap->remove(this);
}
void RenderBox::clearOverrideLogicalContentWidth()
{
if (gOverrideWidthMap)
gOverrideWidthMap->remove(this);
}
void RenderBox::clearOverrideSize()
{
clearOverrideLogicalContentHeight();
clearOverrideLogicalContentWidth();
}
LayoutUnit RenderBox::overrideLogicalContentWidth() const
{
ASSERT(hasOverrideWidth());
return gOverrideWidthMap->get(this);
}
LayoutUnit RenderBox::overrideLogicalContentHeight() const
{
ASSERT(hasOverrideHeight());
return gOverrideHeightMap->get(this);
}
LayoutUnit RenderBox::overrideContainingBlockContentLogicalWidth() const
{
ASSERT(hasOverrideContainingBlockLogicalWidth());
return gOverrideContainingBlockLogicalWidthMap->get(this);
}
LayoutUnit RenderBox::overrideContainingBlockContentLogicalHeight() const
{
ASSERT(hasOverrideContainingBlockLogicalHeight());
return gOverrideContainingBlockLogicalHeightMap->get(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalWidth() const
{
return gOverrideContainingBlockLogicalWidthMap && gOverrideContainingBlockLogicalWidthMap->contains(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalHeight() const
{
return gOverrideContainingBlockLogicalHeightMap && gOverrideContainingBlockLogicalHeightMap->contains(this);
}
void RenderBox::setOverrideContainingBlockContentLogicalWidth(LayoutUnit logicalWidth)
{
if (!gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalWidthMap->set(this, logicalWidth);
}
void RenderBox::setOverrideContainingBlockContentLogicalHeight(LayoutUnit logicalHeight)
{
if (!gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalHeightMap->set(this, logicalHeight);
}
void RenderBox::clearContainingBlockOverrideSize()
{
if (gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap->remove(this);
clearOverrideContainingBlockContentLogicalHeight();
}
void RenderBox::clearOverrideContainingBlockContentLogicalHeight()
{
if (gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap->remove(this);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
if (style()->boxSizing() == CONTENT_BOX)
return width + bordersPlusPadding;
return max(width, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style()->boxSizing() == CONTENT_BOX)
return height + bordersPlusPadding;
return max(height, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
if (style()->boxSizing() == BORDER_BOX)
width -= borderAndPaddingLogicalWidth();
return max<LayoutUnit>(0, width);
}
LayoutUnit RenderBox::adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
if (style()->boxSizing() == BORDER_BOX)
height -= borderAndPaddingLogicalHeight();
return max<LayoutUnit>(0, height);
}
// Hit Testing
bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
LayoutPoint adjustedLocation = accumulatedOffset + location();
// Check kids first.
for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
if (!child->hasLayer() && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation, action)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
}
// Check our bounds next. For this purpose always assume that we can only be hit in the
// foreground phase (which is true for replaced elements like images).
LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
boundsRect.moveBy(adjustedLocation);
if (visibleToHitTestRequest(request) && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
if (!result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect))
return true;
}
return false;
}
// --------------------- painting stuff -------------------------------
void RenderBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutPoint adjustedPaintOffset = paintOffset + location();
// default implementation. Just pass paint through to the children
PaintInfo childInfo(paintInfo);
childInfo.updatePaintingRootForChildren(this);
for (RenderObject* child = firstChild(); child; child = child->nextSibling())
child->paint(childInfo, adjustedPaintOffset);
}
void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
if (paintInfo.skipRootBackground())
return;
RenderObject* rootBackgroundRenderer = rendererForRootBackground();
const FillLayer* bgLayer = rootBackgroundRenderer->style()->backgroundLayers();
Color bgColor = rootBackgroundRenderer->resolveColor(CSSPropertyBackgroundColor);
paintFillLayers(paintInfo, bgColor, bgLayer, view()->backgroundRect(this), BackgroundBleedNone, CompositeSourceOver, rootBackgroundRenderer);
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context) const
{
if (context->paintingDisabled())
return BackgroundBleedNone;
const RenderStyle* style = this->style();
if (!style->hasBackground() || !style->hasBorder() || !style->hasBorderRadius() || borderImageIsLoadedAndCanBeRendered())
return BackgroundBleedNone;
AffineTransform ctm = context->getCTM();
FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
// Because RoundedRect uses IntRect internally the inset applied by the
// BackgroundBleedShrinkBackground strategy cannot be less than one integer
// layout coordinate, even with subpixel layout enabled. To take that into
// account, we clamp the contextScaling to 1.0 for the following test so
// that borderObscuresBackgroundEdge can only return true if the border
// widths are greater than 2 in both layout coordinates and screen
// coordinates.
// This precaution will become obsolete if RoundedRect is ever promoted to
// a sub-pixel representation.
if (contextScaling.width() > 1)
contextScaling.setWidth(1);
if (contextScaling.height() > 1)
contextScaling.setHeight(1);
if (borderObscuresBackgroundEdge(contextScaling))
return BackgroundBleedShrinkBackground;
if (!style->hasAppearance() && borderObscuresBackground() && backgroundHasOpaqueTopLayer())
return BackgroundBleedBackgroundOverBorder;
return BackgroundBleedUseTransparencyLayer;
}
void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this))
return;
LayoutRect paintRect = borderBoxRectInRegion(paintInfo.renderRegion);
paintRect.moveBy(paintOffset);
paintBoxDecorationsWithRect(paintInfo, paintOffset, paintRect);
}
void RenderBox::paintBoxDecorationsWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
{
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
if (!boxShadowShouldBeAppliedToBackground(bleedAvoidance))
paintBoxShadow(paintInfo, paintRect, style(), Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
// To avoid the background color bleeding out behind the border, we'll render background and border
// into a transparency layer, and then clip that in one go (which requires setting up the clip before
// beginning the layer).
RoundedRect border = style()->getRoundedBorderFor(paintRect, view());
stateSaver.save();
paintInfo.context->clipRoundedRect(border);
paintInfo.context->beginTransparencyLayer(1);
}
paintBackgroundWithBorderAndBoxShadow(paintInfo, paintRect, bleedAvoidance);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer)
paintInfo.context->endLayer();
}
void RenderBox::paintBackgroundWithBorderAndBoxShadow(PaintInfo& paintInfo, const LayoutRect& paintRect, BackgroundBleedAvoidance bleedAvoidance)
{
// If we have a native theme appearance, paint that before painting our background.
// The theme will tell us whether or not we should also paint the CSS background.
IntRect snappedPaintRect(pixelSnappedIntRect(paintRect));
bool themePainted = style()->hasAppearance() && !RenderTheme::theme().paint(this, paintInfo, snappedPaintRect);
if (!themePainted) {
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
paintBackground(paintInfo, paintRect, bleedAvoidance);
if (style()->hasAppearance())
RenderTheme::theme().paintDecorations(this, paintInfo, snappedPaintRect);
}
paintBoxShadow(paintInfo, paintRect, style(), Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (bleedAvoidance != BackgroundBleedBackgroundOverBorder && (!style()->hasAppearance() || (!themePainted && RenderTheme::theme().paintBorderOnly(this, paintInfo, snappedPaintRect))) && style()->hasBorder())
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
}
void RenderBox::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, BackgroundBleedAvoidance bleedAvoidance)
{
if (isRoot()) {
paintRootBoxFillLayers(paintInfo);
return;
}
if (isBody() && skipBodyBackground(this))
return;
if (backgroundIsKnownToBeObscured())
return;
paintFillLayers(paintInfo, resolveColor(CSSPropertyBackgroundColor), style()->backgroundLayers(), paintRect, bleedAvoidance);
}
LayoutRect RenderBox::backgroundPaintedExtent() const
{
ASSERT(hasBackground());
LayoutRect backgroundRect = pixelSnappedIntRect(borderBoxRect());
Color backgroundColor = resolveColor(CSSPropertyBackgroundColor);
if (backgroundColor.isValid() && backgroundColor.alpha())
return backgroundRect;
if (!style()->backgroundLayers()->image() || style()->backgroundLayers()->next())
return backgroundRect;
BackgroundImageGeometry geometry;
const_cast<RenderBox*>(this)->calculateBackgroundImageGeometry(style()->backgroundLayers(), backgroundRect, geometry);
return geometry.destRect();
}
bool RenderBox::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
{
if (isBody() && skipBodyBackground(this))
return false;
Color backgroundColor = resolveColor(CSSPropertyBackgroundColor);
if (!backgroundColor.isValid() || backgroundColor.hasAlpha())
return false;
// If the element has appearance, it might be painted by theme.
// We cannot be sure if theme paints the background opaque.
// In this case it is safe to not assume opaqueness.
// FIXME: May be ask theme if it paints opaque.
if (style()->hasAppearance())
return false;
// FIXME: Check the opaqueness of background images.
// FIXME: Use rounded rect if border radius is present.
if (style()->hasBorderRadius())
return false;
// FIXME: The background color clip is defined by the last layer.
if (style()->backgroundLayers()->next())
return false;
LayoutRect backgroundRect;
switch (style()->backgroundClip()) {
case BorderFillBox:
backgroundRect = borderBoxRect();
break;
case PaddingFillBox:
backgroundRect = paddingBoxRect();
break;
case ContentFillBox:
backgroundRect = contentBoxRect();
break;
default:
break;
}
return backgroundRect.contains(localRect);
}
static bool isCandidateForOpaquenessTest(RenderBox* childBox)
{
RenderStyle* childStyle = childBox->style();
if (childStyle->position() != StaticPosition && childBox->containingBlock() != childBox->parent())
return false;
if (childStyle->visibility() != VISIBLE || childStyle->shapeOutside())
return false;
if (!childBox->width() || !childBox->height())
return false;
if (RenderLayer* childLayer = childBox->layer()) {
// FIXME: perhaps this could be less conservative?
if (childLayer->compositingState() != NotComposited)
return false;
// FIXME: Deal with z-index.
if (!childStyle->hasAutoZIndex())
return false;
if (childLayer->hasTransform() || childLayer->isTransparent() || childLayer->hasFilter())
return false;
}
return true;
}
bool RenderBox::foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const
{
if (!maxDepthToTest)
return false;
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!child->isBox())
continue;
RenderBox* childBox = toRenderBox(child);
if (!isCandidateForOpaquenessTest(childBox))
continue;
LayoutPoint childLocation = childBox->location();
if (childBox->isRelPositioned())
childLocation.move(childBox->relativePositionOffset());
LayoutRect childLocalRect = localRect;
childLocalRect.moveBy(-childLocation);
if (childLocalRect.y() < 0 || childLocalRect.x() < 0) {
// If there is unobscured area above/left of a static positioned box then the rect is probably not covered.
if (childBox->style()->position() == StaticPosition)
return false;
continue;
}
if (childLocalRect.maxY() > childBox->height() || childLocalRect.maxX() > childBox->width())
continue;
if (childBox->backgroundIsKnownToBeOpaqueInRect(childLocalRect))
return true;
if (childBox->foregroundIsKnownToBeOpaqueInRect(childLocalRect, maxDepthToTest - 1))
return true;
}
return false;
}
bool RenderBox::computeBackgroundIsKnownToBeObscured()
{
// Test to see if the children trivially obscure the background.
// FIXME: This test can be much more comprehensive.
if (!hasBackground())
return false;
// Table and root background painting is special.
if (isTable() || isRoot())
return false;
// FIXME: box-shadow is painted while background painting.
if (style()->boxShadow())
return false;
LayoutRect backgroundRect = backgroundPaintedExtent();
return foregroundIsKnownToBeOpaqueInRect(backgroundRect, backgroundObscurationTestMaxDepth);
}
bool RenderBox::backgroundHasOpaqueTopLayer() const
{
const FillLayer* fillLayer = style()->backgroundLayers();
if (!fillLayer || fillLayer->clip() != BorderFillBox)
return false;
// Clipped with local scrolling
if (hasOverflowClip() && fillLayer->attachment() == LocalBackgroundAttachment)
return false;
if (fillLayer->hasOpaqueImage(this) && fillLayer->hasRepeatXY() && fillLayer->image()->canRender(this, style()->effectiveZoom()))
return true;
// If there is only one layer and no image, check whether the background color is opaque
if (!fillLayer->next() && !fillLayer->hasImage()) {
Color bgColor = resolveColor(CSSPropertyBackgroundColor);
if (bgColor.isValid() && bgColor.alpha() == 255)
return true;
}
return false;
}
void RenderBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask || paintInfo.context->paintingDisabled())
return;
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintMaskImages(paintInfo, paintRect);
}
void RenderBox::paintClippingMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseClippingMask || paintInfo.context->paintingDisabled())
return;
if (!layer() || layer()->compositingState() != PaintsIntoOwnBacking)
return;
// We should never have this state in this function. A layer with a mask
// should have always created its own backing if it became composited.
ASSERT(layer()->compositingState() != HasOwnBackingButPaintsIntoAncestor);
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintInfo.context->fillRect(pixelSnappedIntRect(paintRect), Color::black);
}
void RenderBox::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
{
// Figure out if we need to push a transparency layer to render our mask.
bool pushTransparencyLayer = false;
bool compositedMask = hasLayer() && layer()->hasCompositedMask();
bool flattenCompositingLayers = view()->frameView() && view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
CompositeOperator compositeOp = CompositeSourceOver;
bool allMaskImagesLoaded = true;
if (!compositedMask || flattenCompositingLayers) {
pushTransparencyLayer = true;
StyleImage* maskBoxImage = style()->maskBoxImage().image();
const FillLayer* maskLayers = style()->maskLayers();
// Don't render a masked element until all the mask images have loaded, to prevent a flash of unmasked content.
if (maskBoxImage)
allMaskImagesLoaded &= maskBoxImage->isLoaded();
if (maskLayers)
allMaskImagesLoaded &= maskLayers->imagesAreLoaded();
paintInfo.context->setCompositeOperation(CompositeDestinationIn);
paintInfo.context->beginTransparencyLayer(1);
compositeOp = CompositeSourceOver;
}
if (allMaskImagesLoaded) {
paintFillLayers(paintInfo, Color(), style()->maskLayers(), paintRect, BackgroundBleedNone, compositeOp);
paintNinePieceImage(paintInfo.context, paintRect, style(), style()->maskBoxImage(), compositeOp);
}
if (pushTransparencyLayer)
paintInfo.context->endLayer();
}
LayoutRect RenderBox::maskClipRect()
{
const NinePieceImage& maskBoxImage = style()->maskBoxImage();
if (maskBoxImage.image()) {
LayoutRect borderImageRect = borderBoxRect();
// Apply outsets to the border box.
borderImageRect.expand(style()->maskBoxImageOutsets());
return borderImageRect;
}
LayoutRect result;
LayoutRect borderBox = borderBoxRect();
for (const FillLayer* maskLayer = style()->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
if (maskLayer->image()) {
BackgroundImageGeometry geometry;
calculateBackgroundImageGeometry(maskLayer, borderBox, geometry);
result.unite(geometry.destRect());
}
}
return result;
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
while (curLayer) {
layers.append(curLayer);
// Stop traversal when an opaque layer is encountered.
// FIXME : It would be possible for the following occlusion culling test to be more aggressive
// on layers with no repeat by testing whether the image covers the layout rect.
// Testing that here would imply duplicating a lot of calculations that are currently done in
// RenderBoxModelObject::paintFillLayerExtended. A more efficient solution might be to move
// the layer recursion into paintFillLayerExtended, or to compute the layer geometry here
// and pass it down.
if (!shouldDrawBackgroundInSeparateBuffer && curLayer->blendMode() != BlendModeNormal)
shouldDrawBackgroundInSeparateBuffer = true;
// The clipOccludesNextLayers condition must be evaluated first to avoid short-circuiting.
if (curLayer->clipOccludesNextLayers(curLayer == fillLayer) && curLayer->hasOpaqueImage(this) && curLayer->image()->canRender(this, style()->effectiveZoom()) && curLayer->hasRepeatXY() && curLayer->blendMode() == BlendModeNormal && !boxShadowShouldBeAppliedToBackground(bleedAvoidance))
break;
curLayer = curLayer->next();
}
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
if (shouldDrawBackgroundInSeparateBuffer)
context->beginTransparencyLayer(1);
Vector<const FillLayer*>::const_reverse_iterator topLayer = layers.rend();
for (Vector<const FillLayer*>::const_reverse_iterator it = layers.rbegin(); it != topLayer; ++it)
paintFillLayer(paintInfo, c, *it, rect, bleedAvoidance, op, backgroundObject);
if (shouldDrawBackgroundInSeparateBuffer)
context->endLayer();
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), op, backgroundObject);
}
static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
{
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data())
return true;
}
return false;
}
void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
{
if (!parent())
return;
if ((style()->borderImage().image() && style()->borderImage().image()->data() == image) ||
(style()->maskBoxImage().image() && style()->maskBoxImage().image()->data() == image)) {
repaint();
return;
}
bool didFullRepaint = repaintLayerRectsForImage(image, style()->backgroundLayers(), true);
if (!didFullRepaint)
repaintLayerRectsForImage(image, style()->maskLayers(), false);
if (hasLayer() && layer()->hasCompositedMask() && layersUseImage(image, style()->maskLayers()))
layer()->contentChanged(MaskImageChanged);
}
bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground)
{
LayoutRect rendererRect;
RenderBox* layerRenderer = 0;
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data() && curLayer->image()->canRender(this, style()->effectiveZoom())) {
// Now that we know this image is being used, compute the renderer and the rect
// if we haven't already
if (!layerRenderer) {
bool drawingRootBackground = drawingBackground && (isRoot() || (isBody() && !document().documentElement()->renderer()->hasBackground()));
if (drawingRootBackground) {
layerRenderer = view();
LayoutUnit rw;
LayoutUnit rh;
if (FrameView* frameView = toRenderView(layerRenderer)->frameView()) {
rw = frameView->contentsWidth();
rh = frameView->contentsHeight();
} else {
rw = layerRenderer->width();
rh = layerRenderer->height();
}
rendererRect = LayoutRect(-layerRenderer->marginLeft(),
-layerRenderer->marginTop(),
max(layerRenderer->width() + layerRenderer->marginWidth() + layerRenderer->borderLeft() + layerRenderer->borderRight(), rw),
max(layerRenderer->height() + layerRenderer->marginHeight() + layerRenderer->borderTop() + layerRenderer->borderBottom(), rh));
} else {
layerRenderer = this;
rendererRect = borderBoxRect();
}
}
BackgroundImageGeometry geometry;
layerRenderer->calculateBackgroundImageGeometry(curLayer, rendererRect, geometry);
layerRenderer->repaintRectangle(geometry.destRect());
if (geometry.destRect() == rendererRect)
return true;
}
}
return false;
}
bool RenderBox::pushContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset, ContentsClipBehavior contentsClipBehavior)
{
if (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseSelfOutline || paintInfo.phase == PaintPhaseMask)
return false;
bool isControlClip = hasControlClip();
bool isOverflowClip = hasOverflowClip() && !layer()->isSelfPaintingLayer();
if (!isControlClip && !isOverflowClip)
return false;
LayoutRect clipRect = isControlClip ? controlClipRect(accumulatedOffset) : overflowClipRect(accumulatedOffset, paintInfo.renderRegion);
RoundedRect clipRoundedRect(0, 0, 0, 0);
bool hasBorderRadius = style()->hasBorderRadius();
if (hasBorderRadius)
clipRoundedRect = style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, size()));
if (contentsClipBehavior == SkipContentsClipIfPossible) {
LayoutRect contentsVisualOverflow = contentsVisualOverflowRect();
if (contentsVisualOverflow.isEmpty())
return false;
// FIXME: Get rid of this slop from here and elsewhere.
// Instead, properly include the outline in visual overflow.
if (RenderView* view = this->view())
contentsVisualOverflow.inflate(view->maximalOutlineSize());
LayoutRect conservativeClipRect = clipRect;
if (hasBorderRadius)
conservativeClipRect.intersect(clipRoundedRect.radiusCenterRect());
conservativeClipRect.moveBy(-accumulatedOffset);
if (hasLayer())
conservativeClipRect.move(scrolledContentOffset());
if (conservativeClipRect.contains(contentsVisualOverflow))
return false;
}
if (paintInfo.phase == PaintPhaseOutline)
paintInfo.phase = PaintPhaseChildOutlines;
else if (paintInfo.phase == PaintPhaseChildBlockBackground) {
paintInfo.phase = PaintPhaseBlockBackground;
paintObject(paintInfo, accumulatedOffset);
paintInfo.phase = PaintPhaseChildBlockBackgrounds;
}
paintInfo.context->save();
if (hasBorderRadius)
paintInfo.context->clipRoundedRect(clipRoundedRect);
paintInfo.context->clip(pixelSnappedIntRect(clipRect));
return true;
}
void RenderBox::popContentsClip(PaintInfo& paintInfo, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset)
{
ASSERT(hasControlClip() || (hasOverflowClip() && !layer()->isSelfPaintingLayer()));
paintInfo.context->restore();
if (originalPhase == PaintPhaseOutline) {
paintInfo.phase = PaintPhaseSelfOutline;
paintObject(paintInfo, accumulatedOffset);
paintInfo.phase = originalPhase;
} else if (originalPhase == PaintPhaseChildBlockBackground)
paintInfo.phase = originalPhase;
}
LayoutRect RenderBox::overflowClipRect(const LayoutPoint& location, RenderRegion* region, OverlayScrollbarSizeRelevancy relevancy)
{
// FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
// here.
LayoutRect clipRect = borderBoxRectInRegion(region);
clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
if (!hasOverflowClip())
return clipRect;
// Subtract out scrollbars if we have them.
if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
clipRect.move(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), 0);
clipRect.contract(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), layer()->scrollableArea()->horizontalScrollbarHeight(relevancy));
return clipRect;
}
LayoutRect RenderBox::clipRect(const LayoutPoint& location, RenderRegion* region)
{
LayoutRect borderBoxRect = borderBoxRectInRegion(region);
LayoutRect clipRect = LayoutRect(borderBoxRect.location() + location, borderBoxRect.size());
RenderView* renderView = view();
if (!style()->clipLeft().isAuto()) {
LayoutUnit c = valueForLength(style()->clipLeft(), borderBoxRect.width(), renderView);
clipRect.move(c, 0);
clipRect.contract(c, 0);
}
// We don't use the region-specific border box's width and height since clip offsets are (stupidly) specified
// from the left and top edges. Therefore it's better to avoid constraining to smaller widths and heights.
if (!style()->clipRight().isAuto())
clipRect.contract(width() - valueForLength(style()->clipRight(), width(), renderView), 0);
if (!style()->clipTop().isAuto()) {
LayoutUnit c = valueForLength(style()->clipTop(), borderBoxRect.height(), renderView);
clipRect.move(0, c);
clipRect.contract(0, c);
}
if (!style()->clipBottom().isAuto())
clipRect.contract(0, height() - valueForLength(style()->clipBottom(), height(), renderView));
return clipRect;
}
LayoutUnit RenderBox::shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock* cb, RenderRegion* region) const
{
RenderRegion* containingBlockRegion = 0;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
LayoutUnit result = cb->availableLogicalWidthForLine(logicalTopPosition, false, containingBlockRegion) - childMarginStart - childMarginEnd;
// We need to see if margins on either the start side or the end side can contain the floats in question. If they can,
// then just using the line width is inaccurate. In the case where a float completely fits, we don't need to use the line
// offset at all, but can instead push all the way to the content edge of the containing block. In the case where the float
// doesn't fit, we can use the line offset, but we need to grow it by the margin to reflect the fact that the margin was
// "consumed" by the float. Negative margins aren't consumed by the float, and so we ignore them.
if (childMarginStart > 0) {
LayoutUnit startContentSide = cb->startOffsetForContent(containingBlockRegion);
LayoutUnit startContentSideWithMargin = startContentSide + childMarginStart;
LayoutUnit startOffset = cb->startOffsetForLine(logicalTopPosition, false, containingBlockRegion);
if (startOffset > startContentSideWithMargin)
result += childMarginStart;
else
result += startOffset - startContentSide;
}
if (childMarginEnd > 0) {
LayoutUnit endContentSide = cb->endOffsetForContent(containingBlockRegion);
LayoutUnit endContentSideWithMargin = endContentSide + childMarginEnd;
LayoutUnit endOffset = cb->endOffsetForLine(logicalTopPosition, false, containingBlockRegion);
if (endOffset > endContentSideWithMargin)
result += childMarginEnd;
else
result += endOffset - endContentSide;
}
return result;
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContent() const
{
if (hasOverrideContainingBlockLogicalWidth())
return overrideContainingBlockContentLogicalWidth();
RenderBlock* cb = containingBlock();
return cb->availableLogicalWidth();
}
LayoutUnit RenderBox::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
{
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
RenderBlock* cb = containingBlock();
return cb->availableLogicalHeight(heightType);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContentInRegion(RenderRegion* region) const
{
if (!region)
return containingBlockLogicalWidthForContent();
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
// FIXME: It's unclear if a region's content should use the containing block's override logical width.
// If it should, the following line should call containingBlockLogicalWidthForContent.
LayoutUnit result = cb->availableLogicalWidth();
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
if (!boxInfo)
return result;
return max<LayoutUnit>(0, result - (cb->logicalWidth() - boxInfo->logicalWidth()));
}
LayoutUnit RenderBox::containingBlockAvailableLineWidthInRegion(RenderRegion* region) const
{
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = 0;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
return cb->availableLogicalWidthForLine(logicalTopPosition, false, containingBlockRegion, availableLogicalHeight(IncludeMarginBorderPadding));
}
LayoutUnit RenderBox::perpendicularContainingBlockLogicalHeight() const
{
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
RenderBlock* cb = containingBlock();
if (cb->hasOverrideHeight())
return cb->overrideLogicalContentHeight();
RenderStyle* containingBlockStyle = cb->style();
Length logicalHeightLength = containingBlockStyle->logicalHeight();
// FIXME: For now just support fixed heights. Eventually should support percentage heights as well.
if (!logicalHeightLength.isFixed()) {
LayoutUnit fillFallbackExtent = containingBlockStyle->isHorizontalWritingMode() ? view()->frameView()->visibleHeight() : view()->frameView()->visibleWidth();
LayoutUnit fillAvailableExtent = containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding);
return min(fillAvailableExtent, fillFallbackExtent);
}
// Use the content box logical height as specified by the style.
return cb->adjustContentBoxLogicalHeightForBoxSizing(logicalHeightLength.value());
}
void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
{
if (repaintContainer == this)
return;
if (RenderView* v = view()) {
if (v->layoutStateEnabled() && !repaintContainer) {
LayoutState* layoutState = v->layoutState();
LayoutSize offset = layoutState->m_paintOffset + locationOffset();
if (style()->hasInFlowPosition() && layer())
offset += layer()->offsetForInFlowPosition();
transformState.move(offset);
return;
}
}
bool containerSkipped;
RenderObject* o = container(repaintContainer, &containerSkipped);
if (!o)
return;
bool isFixedPos = style()->position() == FixedPosition;
bool hasTransform = hasLayer() && layer()->transform();
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
if (hasTransform && !isFixedPos)
mode &= ~IsFixed;
else if (isFixedPos)
mode |= IsFixed;
if (wasFixed)
*wasFixed = mode & IsFixed;
LayoutSize containerOffset = offsetFromContainer(o, roundedLayoutPoint(transformState.mappedPoint()));
bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());
if (mode & UseTransforms && shouldUseTransformFromContainer(o)) {
TransformationMatrix t;
getTransformFromContainer(o, containerOffset, t);
transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
} else
transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
if (containerSkipped) {
// There can't be a transform between repaintContainer and o, because transforms create containers, so it should be safe
// to just subtract the delta between the repaintContainer and o.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
return;
}
mode &= ~ApplyContainerFlip;
o->mapLocalToContainer(repaintContainer, transformState, mode, wasFixed);
}
void RenderBox::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
{
// We don't expect to be called during layout.
ASSERT(!view() || !view()->layoutStateEnabled());
bool isFixedPos = style()->position() == FixedPosition;
bool hasTransform = hasLayer() && layer()->transform();
if (hasTransform && !isFixedPos) {
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
mode &= ~IsFixed;
} else if (isFixedPos)
mode |= IsFixed;
RenderBoxModelObject::mapAbsoluteToLocalPoint(mode, transformState);
}
LayoutSize RenderBox::offsetFromContainer(RenderObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
{
// A region "has" boxes inside it without being their container.
// FIXME: change container() / containingBlock() to count for boxes being positioned relative to the region, not the
// FlowThread. This requires a separate patch as a simple test with such a change in container() causes 129 out of
// 337 regions tests to fail.
ASSERT(o == container() || o->isRenderRegion());
LayoutSize offset;
if (isInFlowPositioned())
offset += offsetForInFlowPosition();
if (!isInline() || isReplaced()) {
if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
RenderBlock* block = toRenderBlock(o);
LayoutRect columnRect(frameRect());
block->adjustStartEdgeForWritingModeIncludingColumns(columnRect);
offset += toSize(columnRect.location());
LayoutPoint columnPoint = block->flipForWritingModeIncludingColumns(point + offset);
offset = toLayoutSize(block->flipForWritingModeIncludingColumns(toLayoutPoint(offset)));
o->adjustForColumns(offset, columnPoint);
offset = block->flipForWritingMode(offset);
if (offsetDependsOnPoint)
*offsetDependsOnPoint = true;
} else
offset += topLeftLocationOffset();
}
if (o->hasOverflowClip())
offset -= toRenderBox(o)->scrolledContentOffset();
if (style()->position() == AbsolutePosition && o->isInFlowPositioned() && o->isRenderInline())
offset += toRenderInline(o)->offsetForInFlowPositionedInline(this);
if (offsetDependsOnPoint)
*offsetDependsOnPoint |= o->isRenderFlowThread();
return offset;
}
InlineBox* RenderBox::createInlineBox()
{
return new InlineBox(this);
}
void RenderBox::dirtyLineBoxes(bool fullLayout)
{
if (m_inlineBoxWrapper) {
if (fullLayout) {
m_inlineBoxWrapper->destroy();
m_inlineBoxWrapper = 0;
} else
m_inlineBoxWrapper->dirtyLineBoxes();
}
}
void RenderBox::positionLineBox(InlineBox* box)
{
if (isOutOfFlowPositioned()) {
// Cache the x position only if we were an INLINE type originally.
bool wasInline = style()->isOriginalDisplayInlineType();
if (wasInline) {
// The value is cached in the xPos of the box. We only need this value if
// our object was inline originally, since otherwise it would have ended up underneath
// the inlines.
RootInlineBox* root = box->root();
root->block()->setStaticInlinePositionForChild(this, root->lineTopWithLeading(), LayoutUnit::fromFloatRound(box->logicalLeft()));
if (style()->hasStaticInlinePosition(box->isHorizontal()))
setChildNeedsLayout(MarkOnlyThis); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
} else {
// Our object was a block originally, so we make our normal flow position be
// just below the line box (as though all the inlines that came before us got
// wrapped in an anonymous block, which is what would have happened had we been
// in flow). This value was cached in the y() of the box.
layer()->setStaticBlockPosition(box->logicalTop());
if (style()->hasStaticBlockPosition(box->isHorizontal()))
setChildNeedsLayout(MarkOnlyThis); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
}
// Nuke the box.
box->remove();
box->destroy();
} else if (isReplaced()) {
setLocation(roundedLayoutPoint(box->topLeft()));
setInlineBoxWrapper(box);
}
}
void RenderBox::deleteLineBoxWrapper()
{
if (m_inlineBoxWrapper) {
if (!documentBeingDestroyed())
m_inlineBoxWrapper->remove();
m_inlineBoxWrapper->destroy();
m_inlineBoxWrapper = 0;
}
}
LayoutRect RenderBox::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
{
if (style()->visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
return LayoutRect();
LayoutRect r = visualOverflowRect();
RenderView* v = view();
if (v) {
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
r.move(v->layoutDelta());
}
if (style()) {
// We have to use maximalOutlineSize() because a child might have an outline
// that projects outside of our overflowRect.
if (v) {
ASSERT(style()->outlineSize() <= v->maximalOutlineSize());
r.inflate(v->maximalOutlineSize());
}
}
computeRectForRepaint(repaintContainer, r);
return r;
}
void RenderBox::computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect& rect, bool fixed) const
{
// The rect we compute at each step is shifted by our x/y offset in the parent container's coordinate space.
// Only when we cross a writing mode boundary will we have to possibly flipForWritingMode (to convert into a more appropriate
// offset corner for the enclosing container). This allows for a fully RL or BT document to repaint
// properly even during layout, since the rect remains flipped all the way until the end.
//
// RenderView::computeRectForRepaint then converts the rect to physical coordinates. We also convert to
// physical when we hit a repaintContainer boundary. Therefore the final rect returned is always in the
// physical coordinate space of the repaintContainer.
RenderStyle* styleToUse = style();
if (RenderView* v = view()) {
// LayoutState is only valid for root-relative, non-fixed position repainting
if (v->layoutStateEnabled() && !repaintContainer && styleToUse->position() != FixedPosition) {
LayoutState* layoutState = v->layoutState();
if (layer() && layer()->transform())
rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
// We can't trust the bits on RenderObject, because this might be called while re-resolving style.
if (styleToUse->hasInFlowPosition() && layer())
rect.move(layer()->offsetForInFlowPosition());
rect.moveBy(location());
rect.move(layoutState->m_paintOffset);
if (layoutState->m_clipped)
rect.intersect(layoutState->m_clipRect);
return;
}
}
if (hasReflection())
rect.unite(reflectedRect(rect));
if (repaintContainer == this) {
if (repaintContainer->style()->isFlippedBlocksWritingMode())
flipForWritingMode(rect);
return;
}
bool containerSkipped;
RenderObject* o = container(repaintContainer, &containerSkipped);
if (!o)
return;
if (isWritingModeRoot() && !isOutOfFlowPositioned())
flipForWritingMode(rect);
LayoutPoint topLeft = rect.location();
topLeft.move(locationOffset());
EPosition position = styleToUse->position();
// We are now in our parent container's coordinate space. Apply our transform to obtain a bounding box
// in the parent's coordinate space that encloses us.
if (hasLayer() && layer()->transform()) {
fixed = position == FixedPosition;
rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
topLeft = rect.location();
topLeft.move(locationOffset());
} else if (position == FixedPosition)
fixed = true;
if (position == AbsolutePosition && o->isInFlowPositioned() && o->isRenderInline()) {
topLeft += toRenderInline(o)->offsetForInFlowPositionedInline(this);
} else if (styleToUse->hasInFlowPosition() && layer()) {
// Apply the relative position offset when invalidating a rectangle. The layer
// is translated, but the render box isn't, so we need to do this to get the
// right dirty rect. Since this is called from RenderObject::setStyle, the relative position
// flag on the RenderObject has been cleared, so use the one on the style().
topLeft += layer()->offsetForInFlowPosition();
}
if (position != AbsolutePosition && position != FixedPosition && o->hasColumns() && o->isRenderBlockFlow()) {
LayoutRect repaintRect(topLeft, rect.size());
toRenderBlock(o)->adjustRectForColumns(repaintRect);
topLeft = repaintRect.location();
rect = repaintRect;
}
// FIXME: We ignore the lightweight clipping rect that controls use, since if |o| is in mid-layout,
// its controlClipRect will be wrong. For overflow clip we use the values cached by the layer.
rect.setLocation(topLeft);
if (o->hasOverflowClip()) {
RenderBox* containerBox = toRenderBox(o);
containerBox->applyCachedClipAndScrollOffsetForRepaint(rect);
if (rect.isEmpty())
return;
}
if (containerSkipped) {
// If the repaintContainer is below o, then we need to map the rect into repaintContainer's coordinates.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
rect.move(-containerOffset);
return;
}
o->computeRectForRepaint(repaintContainer, rect, fixed);
}
void RenderBox::repaintDuringLayoutIfMoved(const LayoutRect& oldRect)
{
if (oldRect.location() != m_frameRect.location()) {
LayoutRect newRect = m_frameRect;
// The child moved. Invalidate the object's old and new positions. We have to do this
// since the object may not have gotten a layout.
m_frameRect = oldRect;
repaint();
repaintOverhangingFloats(true);
m_frameRect = newRect;
repaint();
repaintOverhangingFloats(true);
}
}
void RenderBox::repaintOverhangingFloats(bool)
{
}
void RenderBox::updateLogicalWidth()
{
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues);
setLogicalWidth(computedValues.m_extent);
setLogicalLeft(computedValues.m_position);
setMarginStart(computedValues.m_margins.m_start);
setMarginEnd(computedValues.m_margins.m_end);
}
static float getMaxWidthListMarker(const RenderBox* renderer)
{
#ifndef NDEBUG
ASSERT(renderer);
Node* parentNode = renderer->generatingNode();
ASSERT(parentNode);
ASSERT(parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag));
ASSERT(renderer->style()->textAutosizingMultiplier() != 1);
#endif
float maxWidth = 0;
for (RenderObject* child = renderer->firstChild(); child; child = child->nextSibling()) {
if (!child->isListItem())
continue;
RenderBox* listItem = toRenderBox(child);
for (RenderObject* itemChild = listItem->firstChild(); itemChild; itemChild = itemChild->nextSibling()) {
if (!itemChild->isListMarker())
continue;
RenderBox* itemMarker = toRenderBox(itemChild);
// FIXME: canDetermineWidthWithoutLayout expects us to use fixedOffsetWidth, which this code
// does not do! This check is likely wrong.
if (!itemMarker->canDetermineWidthWithoutLayout() && itemMarker->needsLayout()) {
// Make sure to compute the autosized width.
itemMarker->layout();
}
maxWidth = max<float>(maxWidth, toRenderListMarker(itemMarker)->logicalWidth().toFloat());
break;
}
}
return maxWidth;
}
void RenderBox::computeLogicalWidthInRegion(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
{
computedValues.m_extent = logicalWidth();
computedValues.m_position = logicalLeft();
computedValues.m_margins.m_start = marginStart();
computedValues.m_margins.m_end = marginEnd();
if (isOutOfFlowPositioned()) {
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
computePositionedLogicalWidth(computedValues, region);
return;
}
// If layout is limited to a subtree, the subtree root's logical width does not change.
if (node() && view()->frameView() && view()->frameView()->layoutRoot(true) == this)
return;
// The parent box is flexing us, so it has increased or decreased our
// width. Use the width from the style context.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (hasOverrideWidth() && (style()->borderFit() == BorderFitLines || parent()->isFlexibleBoxIncludingDeprecated())) {
computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
return;
}
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
bool inVerticalBox = parent()->isDeprecatedFlexibleBox() && (parent()->style()->boxOrient() == VERTICAL);
bool stretching = (parent()->style()->boxAlign() == BSTRETCH);
bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inVerticalBox || !stretching);
RenderStyle* styleToUse = style();
Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
RenderBlock* cb = containingBlock();
LayoutUnit containerLogicalWidth = max<LayoutUnit>(0, containingBlockLogicalWidthForContentInRegion(region));
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (isInline() && !isInlineBlockOrInlineTable()) {
// just calculate margins
RenderView* renderView = view();
computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth, renderView);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth, renderView);
if (treatAsReplaced)
computedValues.m_extent = max<LayoutUnit>(floatValueForLength(logicalWidthLength, 0, 0) + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth());
return;
}
// Width calculations
if (treatAsReplaced)
computedValues.m_extent = logicalWidthLength.value() + borderAndPaddingLogicalWidth();
else {
LayoutUnit containerWidthInInlineDirection = containerLogicalWidth;
if (hasPerpendicularContainingBlock)
containerWidthInInlineDirection = perpendicularContainingBlockLogicalHeight();
LayoutUnit preferredWidth = computeLogicalWidthInRegionUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerWidthInInlineDirection, cb, region);
computedValues.m_extent = constrainLogicalWidthInRegionByMinMax(preferredWidth, containerWidthInInlineDirection, cb, region);
}
// Margin calculations.
if (hasPerpendicularContainingBlock || isFloating() || isInline()) {
RenderView* renderView = view();
computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth, renderView);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth, renderView);
} else {
LayoutUnit containerLogicalWidthForAutoMargins = containerLogicalWidth;
if (avoidsFloats() && cb->containsFloats())
containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidthInRegion(region);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
computeInlineDirectionMargins(cb, containerLogicalWidthForAutoMargins, computedValues.m_extent,
hasInvertedDirection ? computedValues.m_margins.m_end : computedValues.m_margins.m_start,
hasInvertedDirection ? computedValues.m_margins.m_start : computedValues.m_margins.m_end);
}
if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
&& !isFloating() && !isInline() && !cb->isFlexibleBoxIncludingDeprecated() && !cb->isRenderGrid()) {
LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(this);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
if (hasInvertedDirection)
computedValues.m_margins.m_start = newMargin;
else
computedValues.m_margins.m_end = newMargin;
}
if (styleToUse->textAutosizingMultiplier() != 1 && styleToUse->marginStart().type() == Fixed) {
Node* parentNode = generatingNode();
if (parentNode && (parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag))) {
// Make sure the markers in a list are properly positioned (i.e. not chopped off) when autosized.
const float adjustedMargin = (1 - 1.0 / styleToUse->textAutosizingMultiplier()) * getMaxWidthListMarker(this);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
if (hasInvertedDirection)
computedValues.m_margins.m_end += adjustedMargin;
else
computedValues.m_margins.m_start += adjustedMargin;
}
}
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth) const
{
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
return fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
RenderView* renderView = view();
marginStart = minimumValueForLength(style()->marginStart(), availableLogicalWidth, renderView);
marginEnd = minimumValueForLength(style()->marginEnd(), availableLogicalWidth, renderView);
return availableLogicalWidth - marginStart - marginEnd;
}
LayoutUnit RenderBox::computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const
{
if (logicalWidthLength.type() == FillAvailable)
return fillAvailableMeasure(availableLogicalWidth);
LayoutUnit minLogicalWidth = 0;
LayoutUnit maxLogicalWidth = 0;
computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
if (logicalWidthLength.type() == MinContent)
return minLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == MaxContent)
return maxLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == FitContent) {
minLogicalWidth += borderAndPadding;
maxLogicalWidth += borderAndPadding;
return max(minLogicalWidth, min(maxLogicalWidth, fillAvailableMeasure(availableLogicalWidth)));
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeLogicalWidthInRegionUsing(SizeType widthType, Length logicalWidth, LayoutUnit availableLogicalWidth,
const RenderBlock* cb, RenderRegion* region) const
{
if (!logicalWidth.isIntrinsicOrAuto()) {
// FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
return adjustBorderBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, availableLogicalWidth, view()));
}
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth());
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
LayoutUnit logicalWidthResult = fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
if (shrinkToAvoidFloats() && cb->containsFloats())
logicalWidthResult = min(logicalWidthResult, shrinkLogicalWidthToAvoidFloats(marginStart, marginEnd, cb, region));
if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(widthType))
return max(minPreferredLogicalWidth(), min(maxPreferredLogicalWidth(), logicalWidthResult));
return logicalWidthResult;
}
static bool columnFlexItemHasStretchAlignment(const RenderObject* flexitem)
{
RenderObject* parent = flexitem->parent();
// auto margins mean we don't stretch. Note that this function will only be used for
// widths, so we don't have to check marginBefore/marginAfter.
ASSERT(parent->style()->isColumnFlexDirection());
if (flexitem->style()->marginStart().isAuto() || flexitem->style()->marginEnd().isAuto())
return false;
return flexitem->style()->alignSelf() == AlignStretch || (flexitem->style()->alignSelf() == AlignAuto && parent->style()->alignItems() == AlignStretch);
}
static bool isStretchingColumnFlexItem(const RenderObject* flexitem)
{
RenderObject* parent = flexitem->parent();
if (parent->isDeprecatedFlexibleBox() && parent->style()->boxOrient() == VERTICAL && parent->style()->boxAlign() == BSTRETCH)
return true;
// We don't stretch multiline flexboxes because they need to apply line spacing (align-content) first.
if (parent->isFlexibleBox() && parent->style()->flexWrap() == FlexNoWrap && parent->style()->isColumnFlexDirection() && columnFlexItemHasStretchAlignment(flexitem))
return true;
return false;
}
bool RenderBox::sizesLogicalWidthToFitContent(SizeType widthType) const
{
// Marquees in WinIE are like a mixture of blocks and inline-blocks. They size as though they're blocks,
// but they allow text to sit on the same line as the marquee.
if (isFloating() || (isInlineBlockOrInlineTable() && !isMarquee()))
return true;
// This code may look a bit strange. Basically width:intrinsic should clamp the size when testing both
// min-width and width. max-width is only clamped if it is also intrinsic.
Length logicalWidth = (widthType == MaxSize) ? style()->logicalMaxWidth() : style()->logicalWidth();
if (logicalWidth.type() == Intrinsic)
return true;
// Children of a horizontal marquee do not fill the container by default.
// FIXME: Need to deal with MAUTO value properly. It could be vertical.
// FIXME: Think about block-flow here. Need to find out how marquee direction relates to
// block-flow (as well as how marquee overflow should relate to block flow).
// https://bugs.webkit.org/show_bug.cgi?id=46472
if (parent()->isMarquee()) {
EMarqueeDirection dir = parent()->style()->marqueeDirection();
if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
return true;
}
// Flexible box items should shrink wrap, so we lay them out at their intrinsic widths.
// In the case of columns that have a stretch alignment, we go ahead and layout at the
// stretched size to avoid an extra layout when applying alignment.
if (parent()->isFlexibleBox()) {
// For multiline columns, we need to apply align-content first, so we can't stretch now.
if (!parent()->style()->isColumnFlexDirection() || parent()->style()->flexWrap() != FlexNoWrap)
return true;
if (!columnFlexItemHasStretchAlignment(this))
return true;
}
// Flexible horizontal boxes lay out children at their intrinsic widths. Also vertical boxes
// that don't stretch their kids lay out their children at their intrinsic widths.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (parent()->isDeprecatedFlexibleBox() && (parent()->style()->boxOrient() == HORIZONTAL || parent()->style()->boxAlign() != BSTRETCH))
return true;
// Button, input, select, textarea, and legend treat width value of 'auto' as 'intrinsic' unless it's in a
// stretching column flexbox.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (logicalWidth.type() == Auto && !isStretchingColumnFlexItem(this) && autoWidthShouldFitContent())
return true;
if (isHorizontalWritingMode() != containingBlock()->isHorizontalWritingMode())
return true;
return false;
}
bool RenderBox::autoWidthShouldFitContent() const
{
if (node() && (node()->hasTagName(inputTag) || node()->hasTagName(selectTag) || node()->hasTagName(buttonTag)
|| isHTMLTextAreaElement(node()) || node()->hasTagName(legendTag)))
return true;
return false;
}
void RenderBox::computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
const RenderStyle* containingBlockStyle = containingBlock->style();
Length marginStartLength = style()->marginStartUsing(containingBlockStyle);
Length marginEndLength = style()->marginEndUsing(containingBlockStyle);
RenderView* renderView = view();
if (isFloating() || isInline()) {
// Inline blocks/tables and floats don't have their margins increased.
marginStart = minimumValueForLength(marginStartLength, containerWidth, renderView);
marginEnd = minimumValueForLength(marginEndLength, containerWidth, renderView);
return;
}
if (containingBlock->isFlexibleBox()) {
// We need to let flexbox handle the margin adjustment - otherwise, flexbox
// will think we're wider than we actually are and calculate line sizes wrong.
// See also http://dev.w3.org/csswg/css-flexbox/#auto-margins
if (marginStartLength.isAuto())
marginStartLength.setValue(0);
if (marginEndLength.isAuto())
marginEndLength.setValue(0);
}
// Case One: The object is being centered in the containing block's available logical width.
if ((marginStartLength.isAuto() && marginEndLength.isAuto() && childWidth < containerWidth)
|| (!marginStartLength.isAuto() && !marginEndLength.isAuto() && containingBlock->style()->textAlign() == WEBKIT_CENTER)) {
// Other browsers center the margin box for align=center elements so we match them here.
LayoutUnit marginStartWidth = minimumValueForLength(marginStartLength, containerWidth, renderView);
LayoutUnit marginEndWidth = minimumValueForLength(marginEndLength, containerWidth, renderView);
LayoutUnit centeredMarginBoxStart = max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
marginStart = centeredMarginBoxStart + marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart + marginEndWidth;
return;
}
// Case Two: The object is being pushed to the start of the containing block's available logical width.
if (marginEndLength.isAuto() && childWidth < containerWidth) {
marginStart = valueForLength(marginStartLength, containerWidth, renderView);
marginEnd = containerWidth - childWidth - marginStart;
return;
}
// Case Three: The object is being pushed to the end of the containing block's available logical width.
bool pushToEndFromTextAlign = !marginEndLength.isAuto() && ((!containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_LEFT)
|| (containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_RIGHT));
if ((marginStartLength.isAuto() && childWidth < containerWidth) || pushToEndFromTextAlign) {
marginEnd = valueForLength(marginEndLength, containerWidth, renderView);
marginStart = containerWidth - childWidth - marginEnd;
return;
}
// Case Four: Either no auto margins, or our width is >= the container width (css2.1, 10.3.3). In that case
// auto margins will just turn into 0.
marginStart = minimumValueForLength(marginStartLength, containerWidth, renderView);
marginEnd = minimumValueForLength(marginEndLength, containerWidth, renderView);
}
RenderBoxRegionInfo* RenderBox::renderBoxRegionInfo(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
// Make sure nobody is trying to call this with a null region.
if (!region)
return 0;
// If we have computed our width in this region already, it will be cached, and we can
// just return it.
RenderBoxRegionInfo* boxInfo = region->renderBoxRegionInfo(this);
if (boxInfo && cacheFlag == CacheRenderBoxRegionInfo)
return boxInfo;
// No cached value was found, so we have to compute our insets in this region.
// FIXME: For now we limit this computation to normal RenderBlocks. Future patches will expand
// support to cover all boxes.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (isRenderFlowThread() || !flowThread || !canHaveBoxInfoInRegion() || flowThread->style()->writingMode() != style()->writingMode())
return 0;
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues, region);
// Now determine the insets based off where this object is supposed to be positioned.
RenderBlock* cb = containingBlock();
RenderRegion* clampedContainingBlockRegion = cb->clampToStartAndEndRegions(region);
RenderBoxRegionInfo* containingBlockInfo = cb->renderBoxRegionInfo(clampedContainingBlockRegion);
LayoutUnit containingBlockLogicalWidth = cb->logicalWidth();
LayoutUnit containingBlockLogicalWidthInRegion = containingBlockInfo ? containingBlockInfo->logicalWidth() : containingBlockLogicalWidth;
LayoutUnit marginStartInRegion = computedValues.m_margins.m_start;
LayoutUnit startMarginDelta = marginStartInRegion - marginStart();
LayoutUnit logicalWidthInRegion = computedValues.m_extent;
LayoutUnit logicalLeftInRegion = computedValues.m_position;
LayoutUnit widthDelta = logicalWidthInRegion - logicalWidth();
LayoutUnit logicalLeftDelta = isOutOfFlowPositioned() ? logicalLeftInRegion - logicalLeft() : startMarginDelta;
LayoutUnit logicalRightInRegion = containingBlockLogicalWidthInRegion - (logicalLeftInRegion + logicalWidthInRegion);
LayoutUnit oldLogicalRight = containingBlockLogicalWidth - (logicalLeft() + logicalWidth());
LayoutUnit logicalRightDelta = isOutOfFlowPositioned() ? logicalRightInRegion - oldLogicalRight : startMarginDelta;
LayoutUnit logicalLeftOffset = 0;
if (!isOutOfFlowPositioned() && avoidsFloats() && cb->containsFloats()) {
LayoutUnit startPositionDelta = cb->computeStartPositionDeltaForChildAvoidingFloats(this, marginStartInRegion, region);
if (cb->style()->isLeftToRightDirection())
logicalLeftDelta += startPositionDelta;
else
logicalRightDelta += startPositionDelta;
}
if (cb->style()->isLeftToRightDirection())
logicalLeftOffset += logicalLeftDelta;
else
logicalLeftOffset -= (widthDelta + logicalRightDelta);
LayoutUnit logicalRightOffset = logicalWidth() - (logicalLeftOffset + logicalWidthInRegion);
bool isShifted = (containingBlockInfo && containingBlockInfo->isShifted())
|| (style()->isLeftToRightDirection() && logicalLeftOffset)
|| (!style()->isLeftToRightDirection() && logicalRightOffset);
// FIXME: Although it's unlikely, these boxes can go outside our bounds, and so we will need to incorporate them into overflow.
if (cacheFlag == CacheRenderBoxRegionInfo)
return region->setRenderBoxRegionInfo(this, logicalLeftOffset, logicalWidthInRegion, isShifted);
return new RenderBoxRegionInfo(logicalLeftOffset, logicalWidthInRegion, isShifted);
}
static bool shouldFlipBeforeAfterMargins(const RenderStyle* containingBlockStyle, const RenderStyle* childStyle)
{
ASSERT(containingBlockStyle->isHorizontalWritingMode() != childStyle->isHorizontalWritingMode());
WritingMode childWritingMode = childStyle->writingMode();
bool shouldFlip = false;
switch (containingBlockStyle->writingMode()) {
case TopToBottomWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case BottomToTopWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case RightToLeftWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
case LeftToRightWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
}
if (!containingBlockStyle->isLeftToRightDirection())
shouldFlip = !shouldFlip;
return shouldFlip;
}
void RenderBox::updateLogicalHeight()
{
m_intrinsicContentLogicalHeight = contentLogicalHeight();
LogicalExtentComputedValues computedValues;
computeLogicalHeight(logicalHeight(), logicalTop(), computedValues);
setLogicalHeight(computedValues.m_extent);
setLogicalTop(computedValues.m_position);
setMarginBefore(computedValues.m_margins.m_before);
setMarginAfter(computedValues.m_margins.m_after);
}
void RenderBox::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
{
computedValues.m_extent = logicalHeight;
computedValues.m_position = logicalTop;
// Cell height is managed by the table and inline non-replaced elements do not support a height property.
if (isTableCell() || (isInline() && !isReplaced()))
return;
Length h;
if (isOutOfFlowPositioned())
computePositionedLogicalHeight(computedValues);
else {
RenderBlock* cb = containingBlock();
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (!hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = cb->style()->writingMode() != style()->writingMode();
computeBlockDirectionMargins(cb,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
// For tables, calculate margins only.
if (isTable()) {
if (hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = shouldFlipBeforeAfterMargins(cb->style(), style());
computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), computedValues.m_extent,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
return;
}
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
bool inHorizontalBox = parent()->isDeprecatedFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL;
bool stretching = parent()->style()->boxAlign() == BSTRETCH;
bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inHorizontalBox || !stretching);
bool checkMinMaxHeight = false;
// The parent box is flexing us, so it has increased or decreased our height. We have to
// grab our cached flexible height.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (hasOverrideHeight() && parent()->isFlexibleBoxIncludingDeprecated())
h = Length(overrideLogicalContentHeight(), Fixed);
else if (treatAsReplaced)
h = Length(computeReplacedLogicalHeight(), Fixed);
else {
h = style()->logicalHeight();
checkMinMaxHeight = true;
}
// Block children of horizontal flexible boxes fill the height of the box.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (h.isAuto() && parent()->isDeprecatedFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL
&& parent()->isStretchingChildren()) {
h = Length(parentBox()->contentLogicalHeight() - marginBefore() - marginAfter() - borderAndPaddingLogicalHeight(), Fixed);
checkMinMaxHeight = false;
}
LayoutUnit heightResult;
if (checkMinMaxHeight) {
heightResult = computeLogicalHeightUsing(style()->logicalHeight(), computedValues.m_extent - borderAndPaddingLogicalHeight());
if (heightResult == -1)
heightResult = computedValues.m_extent;
heightResult = constrainLogicalHeightByMinMax(heightResult, computedValues.m_extent - borderAndPaddingLogicalHeight());
} else {
// The only times we don't check min/max height are when a fixed length has
// been given as an override. Just use that. The value has already been adjusted
// for box-sizing.
ASSERT(h.isFixed());
heightResult = h.value() + borderAndPaddingLogicalHeight();
}
computedValues.m_extent = heightResult;
if (hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = shouldFlipBeforeAfterMargins(cb->style(), style());
computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), heightResult,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
}
// WinIE quirk: The <html> block always fills the entire canvas in quirks mode. The <body> always fills the
// <html> block in quirks mode. Only apply this quirk if the block is normal flow and no height
// is specified. When we're printing, we also need this quirk if the body or root has a percentage
// height since we don't set a height in RenderView when we're printing. So without this quirk, the
// height has nothing to be a percentage of, and it ends up being 0. That is bad.
bool paginatedContentNeedsBaseHeight = document().printing() && h.isPercent()
&& (isRoot() || (isBody() && document().documentElement()->renderer()->style()->logicalHeight().isPercent())) && !isInline();
if (stretchesToViewport() || paginatedContentNeedsBaseHeight) {
LayoutUnit margins = collapsedMarginBefore() + collapsedMarginAfter();
LayoutUnit visibleHeight = viewLogicalHeightForPercentages();
if (isRoot())
computedValues.m_extent = max(computedValues.m_extent, visibleHeight - margins);
else {
LayoutUnit marginsBordersPadding = margins + parentBox()->marginBefore() + parentBox()->marginAfter() + parentBox()->borderAndPaddingLogicalHeight();
computedValues.m_extent = max(computedValues.m_extent, visibleHeight - marginsBordersPadding);
}
}
}
LayoutUnit RenderBox::viewLogicalHeightForPercentages() const
{
if (document().printing())
return static_cast<LayoutUnit>(view()->pageLogicalHeight());
return view()->viewLogicalHeight();
}
LayoutUnit RenderBox::computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit logicalHeight = computeContentAndScrollbarLogicalHeightUsing(height, intrinsicContentHeight);
if (logicalHeight != -1)
logicalHeight = adjustBorderBoxLogicalHeightForBoxSizing(logicalHeight);
return logicalHeight;
}
LayoutUnit RenderBox::computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit heightIncludingScrollbar = computeContentAndScrollbarLogicalHeightUsing(height, intrinsicContentHeight);
if (heightIncludingScrollbar == -1)
return -1;
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar) - scrollbarLogicalHeight());
}
LayoutUnit RenderBox::computeIntrinsicLogicalContentHeightUsing(Length logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (logicalHeightLength.isMinContent() || logicalHeightLength.isMaxContent() || logicalHeightLength.isFitContent()) {
if (isReplaced())
return intrinsicSize().height();
if (m_intrinsicContentLogicalHeight != -1)
return m_intrinsicContentLogicalHeight;
return intrinsicContentHeight;
}
if (logicalHeightLength.isFillAvailable())
return containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding) - borderAndPadding;
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeContentAndScrollbarLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (height.isIntrinsic()) {
if (intrinsicContentHeight == -1)
return -1; // Intrinsic height isn't available.
return computeIntrinsicLogicalContentHeightUsing(height, intrinsicContentHeight, borderAndPaddingLogicalHeight());
}
if (height.isFixed())
return height.value();
if (height.isPercent())
return computePercentageLogicalHeight(height);
if (height.isViewportPercentage())
return valueForLength(height, 0, view());
return -1;
}
bool RenderBox::skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const
{
// For quirks mode and anonymous blocks, we skip auto-height containingBlocks when computing percentages.
// For standards mode, we treat the percentage as auto if it has an auto-height containing block.
if (!document().inQuirksMode() && !containingBlock->isAnonymousBlock())
return false;
return !containingBlock->isTableCell() && !containingBlock->isOutOfFlowPositioned() && containingBlock->style()->logicalHeight().isAuto() && isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode();
}
LayoutUnit RenderBox::computePercentageLogicalHeight(const Length& height) const
{
LayoutUnit availableHeight = -1;
bool skippedAutoHeightContainingBlock = false;
RenderBlock* cb = containingBlock();
const RenderBox* containingBlockChild = this;
LayoutUnit rootMarginBorderPaddingHeight = 0;
while (!cb->isRenderView() && skipContainingBlockForPercentHeightCalculation(cb)) {
if (cb->isBody() || cb->isRoot())
rootMarginBorderPaddingHeight += cb->marginBefore() + cb->marginAfter() + cb->borderAndPaddingLogicalHeight();
skippedAutoHeightContainingBlock = true;
containingBlockChild = cb;
cb = cb->containingBlock();
cb->addPercentHeightDescendant(const_cast<RenderBox*>(this));
}
RenderStyle* cbstyle = cb->style();
// A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
// explicitly specified that can be used for any percentage computations.
bool isOutOfFlowPositionedWithSpecifiedHeight = cb->isOutOfFlowPositioned() && (!cbstyle->logicalHeight().isAuto() || (!cbstyle->logicalTop().isAuto() && !cbstyle->logicalBottom().isAuto()));
bool includeBorderPadding = isTable();
if (isHorizontalWritingMode() != cb->isHorizontalWritingMode())
availableHeight = containingBlockChild->containingBlockLogicalWidthForContent();
else if (hasOverrideContainingBlockLogicalHeight())
availableHeight = overrideContainingBlockContentLogicalHeight();
else if (cb->isTableCell()) {
if (!skippedAutoHeightContainingBlock) {
// Table cells violate what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not. We just always make ourselves
// be a percentage of the cell's current content height.
if (!cb->hasOverrideHeight()) {
// Normally we would let the cell size intrinsically, but scrolling overflow has to be
// treated differently, since WinIE lets scrolled overflow regions shrink as needed.
// While we can't get all cases right, we can at least detect when the cell has a specified
// height or when the table has a specified height. In these cases we want to initially have
// no size and allow the flexing of the table or the cell to its specified height to cause us
// to grow to fill the space. This could end up being wrong in some cases, but it is
// preferable to the alternative (sizing intrinsically and making the row end up too big).
RenderTableCell* cell = toRenderTableCell(cb);
if (scrollsOverflowY() && (!cell->style()->logicalHeight().isAuto() || !cell->table()->style()->logicalHeight().isAuto()))
return 0;
return -1;
}
availableHeight = cb->overrideLogicalContentHeight();
includeBorderPadding = true;
}
} else if (cbstyle->logicalHeight().isFixed()) {
LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle->logicalHeight().value());
availableHeight = max<LayoutUnit>(0, cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeight - cb->scrollbarLogicalHeight(), -1));
} else if (cbstyle->logicalHeight().isPercent() && !isOutOfFlowPositionedWithSpecifiedHeight) {
// We need to recur and compute the percentage height for our containing block.
LayoutUnit heightWithScrollbar = cb->computePercentageLogicalHeight(cbstyle->logicalHeight());
if (heightWithScrollbar != -1) {
LayoutUnit contentBoxHeightWithScrollbar = cb->adjustContentBoxLogicalHeightForBoxSizing(heightWithScrollbar);
// We need to adjust for min/max height because this method does not
// handle the min/max of the current block, its caller does. So the
// return value from the recursive call will not have been adjusted
// yet.
LayoutUnit contentBoxHeight = cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeightWithScrollbar - cb->scrollbarLogicalHeight(), -1);
availableHeight = max<LayoutUnit>(0, contentBoxHeight);
}
} else if (cbstyle->logicalHeight().isViewportPercentage()) {
LayoutUnit heightWithScrollbar = valueForLength(cbstyle->logicalHeight(), 0, view());
if (heightWithScrollbar != -1) {
LayoutUnit contentBoxHeightWithScrollbar = cb->adjustContentBoxLogicalHeightForBoxSizing(heightWithScrollbar);
// We need to adjust for min/max height because this method does not
// handle the min/max of the current block, its caller does. So the
// return value from the recursive call will not have been adjusted
// yet.
LayoutUnit contentBoxHeight = cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeightWithScrollbar - cb->scrollbarLogicalHeight(), -1);
availableHeight = max<LayoutUnit>(0, contentBoxHeight);
}
} else if (isOutOfFlowPositionedWithSpecifiedHeight) {
// Don't allow this to affect the block' height() member variable, since this
// can get called while the block is still laying out its kids.
LogicalExtentComputedValues computedValues;
cb->computeLogicalHeight(cb->logicalHeight(), 0, computedValues);
availableHeight = computedValues.m_extent - cb->borderAndPaddingLogicalHeight() - cb->scrollbarLogicalHeight();
} else if (cb->isRenderView())
availableHeight = viewLogicalHeightForPercentages();
if (availableHeight == -1)
return availableHeight;
availableHeight -= rootMarginBorderPaddingHeight;
LayoutUnit result = valueForLength(height, availableHeight);
if (includeBorderPadding) {
// FIXME: Table cells should default to box-sizing: border-box so we can avoid this hack.
// It is necessary to use the border-box to match WinIE's broken
// box model. This is essential for sizing inside
// table cells using percentage heights.
result -= borderAndPaddingLogicalHeight();
return max<LayoutUnit>(0, result);
}
return result;
}
LayoutUnit RenderBox::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
{
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), shouldComputePreferred);
}
LayoutUnit RenderBox::computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred shouldComputePreferred) const
{
LayoutUnit minLogicalWidth = (shouldComputePreferred == ComputePreferred && style()->logicalMinWidth().isPercent()) || style()->logicalMinWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMinWidth());
LayoutUnit maxLogicalWidth = (shouldComputePreferred == ComputePreferred && style()->logicalMaxWidth().isPercent()) || style()->logicalMaxWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth());
return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
}
LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(Length logicalWidth) const
{
switch (logicalWidth.type()) {
case Fixed:
return adjustContentBoxLogicalWidthForBoxSizing(logicalWidth.value());
case MinContent:
case MaxContent: {
// MinContent/MaxContent don't need the availableLogicalWidth argument.
LayoutUnit availableLogicalWidth = 0;
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
}
case ViewportPercentageWidth:
case ViewportPercentageHeight:
case ViewportPercentageMin:
case ViewportPercentageMax:
return adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, 0, view()));
case FitContent:
case FillAvailable:
case Percent:
case Calculated: {
// FIXME: containingBlockLogicalWidthForContent() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
const LayoutUnit cw = isOutOfFlowPositioned() ? containingBlockLogicalWidthForPositioned(toRenderBoxModelObject(container())) : containingBlockLogicalWidthForContent();
Length containerLogicalWidth = containingBlock()->style()->logicalWidth();
// FIXME: Handle cases when containing block width is calculated or viewport percent.
// https://bugs.webkit.org/show_bug.cgi?id=91071
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, cw, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
if (cw > 0 || (!cw && (containerLogicalWidth.isFixed() || containerLogicalWidth.isPercent())))
return adjustContentBoxLogicalWidthForBoxSizing(minimumValueForLength(logicalWidth, cw));
}
// fall through
case Intrinsic:
case MinIntrinsic:
case Auto:
case Relative:
case ExtendToZoom:
case Undefined:
return intrinsicLogicalWidth();
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeReplacedLogicalHeight() const
{
return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style()->logicalHeight()));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const
{
LayoutUnit minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight());
LayoutUnit maxLogicalHeight = style()->logicalMaxHeight().isUndefined() ? logicalHeight : computeReplacedLogicalHeightUsing(style()->logicalMaxHeight());
return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightUsing(Length logicalHeight) const
{
switch (logicalHeight.type()) {
case Fixed:
return adjustContentBoxLogicalHeightForBoxSizing(logicalHeight.value());
case Percent:
case Calculated:
{
RenderObject* cb = isOutOfFlowPositioned() ? container() : containingBlock();
while (cb->isAnonymous()) {
cb = cb->containingBlock();
toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
}
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (cb->isOutOfFlowPositioned() && cb->style()->height().isAuto() && !(cb->style()->top().isAuto() || cb->style()->bottom().isAuto())) {
ASSERT_WITH_SECURITY_IMPLICATION(cb->isRenderBlock());
RenderBlock* block = toRenderBlock(cb);
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight() - block->scrollbarLogicalHeight();
LayoutUnit newHeight = block->adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, newHeight));
}
// FIXME: availableLogicalHeight() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
LayoutUnit availableHeight;
if (isOutOfFlowPositioned())
availableHeight = containingBlockLogicalHeightForPositioned(toRenderBoxModelObject(cb));
else {
availableHeight = containingBlockLogicalHeightForContent(IncludeMarginBorderPadding);
// It is necessary to use the border-box to match WinIE's broken
// box model. This is essential for sizing inside
// table cells using percentage heights.
// FIXME: This needs to be made block-flow-aware. If the cell and image are perpendicular block-flows, this isn't right.
// https://bugs.webkit.org/show_bug.cgi?id=46997
while (cb && !cb->isRenderView() && (cb->style()->logicalHeight().isAuto() || cb->style()->logicalHeight().isPercent())) {
if (cb->isTableCell()) {
// Don't let table cells squeeze percent-height replaced elements
// <http://bugs.webkit.org/show_bug.cgi?id=15359>
availableHeight = max(availableHeight, intrinsicLogicalHeight());
return valueForLength(logicalHeight, availableHeight - borderAndPaddingLogicalHeight());
}
toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
cb = cb->containingBlock();
}
}
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, availableHeight));
}
case ViewportPercentageWidth:
case ViewportPercentageHeight:
case ViewportPercentageMin:
case ViewportPercentageMax:
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, 0, view()));
case MinContent:
case MaxContent:
case FitContent:
case FillAvailable:
return adjustContentBoxLogicalHeightForBoxSizing(computeIntrinsicLogicalContentHeightUsing(logicalHeight, intrinsicLogicalHeight(), borderAndPaddingHeight()));
default:
return intrinsicLogicalHeight();
}
}
LayoutUnit RenderBox::availableLogicalHeight(AvailableLogicalHeightType heightType) const
{
return constrainLogicalHeightByMinMax(availableLogicalHeightUsing(style()->logicalHeight(), heightType), -1);
}
LayoutUnit RenderBox::availableLogicalHeightUsing(const Length& h, AvailableLogicalHeightType heightType) const
{
if (isRenderView())
return isHorizontalWritingMode() ? toRenderView(this)->frameView()->visibleHeight() : toRenderView(this)->frameView()->visibleWidth();
// We need to stop here, since we don't want to increase the height of the table
// artificially. We're going to rely on this cell getting expanded to some new
// height, and then when we lay out again we'll use the calculation below.
if (isTableCell() && (h.isAuto() || h.isPercent())) {
if (hasOverrideHeight())
return overrideLogicalContentHeight();
return logicalHeight() - borderAndPaddingLogicalHeight();
}
if (h.isPercent() && isOutOfFlowPositioned() && !isRenderFlowThread()) {
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForPositioned(containingBlock());
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(h, availableHeight));
}
LayoutUnit heightIncludingScrollbar = computeContentAndScrollbarLogicalHeightUsing(h, -1);
if (heightIncludingScrollbar != -1)
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar) - scrollbarLogicalHeight());
// FIXME: Check logicalTop/logicalBottom here to correctly handle vertical writing-mode.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (isRenderBlock() && isOutOfFlowPositioned() && style()->height().isAuto() && !(style()->top().isAuto() || style()->bottom().isAuto())) {
RenderBlock* block = const_cast<RenderBlock*>(toRenderBlock(this));
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight() - block->scrollbarLogicalHeight();
return adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
}
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForContent(heightType);
if (heightType == ExcludeMarginBorderPadding) {
// FIXME: Margin collapsing hasn't happened yet, so this incorrectly removes collapsed margins.
availableHeight -= marginBefore() + marginAfter() + borderAndPaddingLogicalHeight();
}
return availableHeight;
}
void RenderBox::computeBlockDirectionMargins(const RenderBlock* containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const
{
if (isTableCell()) {
// FIXME: Not right if we allow cells to have different directionality than the table. If we do allow this, though,
// we may just do it with an extra anonymous block inside the cell.
marginBefore = 0;
marginAfter = 0;
return;
}
// Margins are calculated with respect to the logical width of
// the containing block (8.3)
LayoutUnit cw = containingBlockLogicalWidthForContent();
RenderView* renderView = view();
RenderStyle* containingBlockStyle = containingBlock->style();
marginBefore = minimumValueForLength(style()->marginBeforeUsing(containingBlockStyle), cw, renderView);
marginAfter = minimumValueForLength(style()->marginAfterUsing(containingBlockStyle), cw, renderView);
}
void RenderBox::computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock)
{
LayoutUnit marginBefore;
LayoutUnit marginAfter;
computeBlockDirectionMargins(containingBlock, marginBefore, marginAfter);
containingBlock->setMarginBeforeForChild(this, marginBefore);
containingBlock->setMarginAfterForChild(this, marginAfter);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, RenderRegion* region, bool checkForPerpendicularWritingMode) const
{
if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
return containingBlockLogicalHeightForPositioned(containingBlock, false);
// Use viewport as container for top-level fixed-position elements.
if (style()->position() == FixedPosition && containingBlock->isRenderView()) {
const RenderView* view = static_cast<const RenderView*>(containingBlock);
if (FrameView* frameView = view->frameView()) {
LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
return containingBlock->isHorizontalWritingMode() ? viewportRect.width() : viewportRect.height();
}
}
if (containingBlock->isBox()) {
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread)
return toRenderBox(containingBlock)->clientLogicalWidth();
const RenderBlock* cb = toRenderBlock(containingBlock);
RenderBoxRegionInfo* boxInfo = 0;
if (!region) {
if (containingBlock->isRenderFlowThread() && !checkForPerpendicularWritingMode)
return toRenderFlowThread(containingBlock)->contentLogicalWidthOfFirstRegion();
if (isWritingModeRoot()) {
LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage();
RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
if (cbRegion) {
cbRegion = cb->clampToStartAndEndRegions(cbRegion);
boxInfo = cb->renderBoxRegionInfo(cbRegion);
}
}
} else if (region && flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode()) {
RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
}
return (boxInfo) ? max<LayoutUnit>(0, cb->clientLogicalWidth() - (cb->logicalWidth() - boxInfo->logicalWidth())) : cb->clientLogicalWidth();
}
ASSERT(containingBlock->isRenderInline() && containingBlock->isInFlowPositioned());
const RenderInline* flow = toRenderInline(containingBlock);
InlineFlowBox* first = flow->firstLineBox();
InlineFlowBox* last = flow->lastLineBox();
// If the containing block is empty, return a width of 0.
if (!first || !last)
return 0;
LayoutUnit fromLeft;
LayoutUnit fromRight;
if (containingBlock->style()->isLeftToRightDirection()) {
fromLeft = first->logicalLeft() + first->borderLogicalLeft();
fromRight = last->logicalLeft() + last->logicalWidth() - last->borderLogicalRight();
} else {
fromRight = first->logicalLeft() + first->logicalWidth() - first->borderLogicalRight();
fromLeft = last->logicalLeft() + last->borderLogicalLeft();
}
return max<LayoutUnit>(0, fromRight - fromLeft);
}
LayoutUnit RenderBox::containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
{
if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
return containingBlockLogicalWidthForPositioned(containingBlock, 0, false);
// Use viewport as container for top-level fixed-position elements.
if (style()->position() == FixedPosition && containingBlock->isRenderView()) {
const RenderView* view = static_cast<const RenderView*>(containingBlock);
if (FrameView* frameView = view->frameView()) {
LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
return containingBlock->isHorizontalWritingMode() ? viewportRect.height() : viewportRect.width();
}
}
if (containingBlock->isBox()) {
const RenderBlock* cb = toRenderBlock(containingBlock);
LayoutUnit result = cb->clientLogicalHeight();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && containingBlock->isRenderFlowThread() && flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode())
return toRenderFlowThread(containingBlock)->contentLogicalHeightOfFirstRegion();
return result;
}
ASSERT(containingBlock->isRenderInline() && containingBlock->isInFlowPositioned());
const RenderInline* flow = toRenderInline(containingBlock);
InlineFlowBox* first = flow->firstLineBox();
InlineFlowBox* last = flow->lastLineBox();
// If the containing block is empty, return a height of 0.
if (!first || !last)
return 0;
LayoutUnit heightResult;
LayoutRect boundingBox = flow->linesBoundingBox();
if (containingBlock->isHorizontalWritingMode())
heightResult = boundingBox.height();
else
heightResult = boundingBox.width();
heightResult -= (containingBlock->borderBefore() + containingBlock->borderAfter());
return heightResult;
}
static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth, RenderRegion* region)
{
if (!logicalLeft.isAuto() || !logicalRight.isAuto())
return;
// FIXME: The static distance computation has not been patched for mixed writing modes yet.
if (child->parent()->style()->direction() == LTR) {
LayoutUnit staticPosition = child->layer()->staticInlinePosition() - containerBlock->borderLogicalLeft();
for (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
if (curr->isBox()) {
staticPosition += toRenderBox(curr)->logicalLeft();
if (toRenderBox(curr)->isRelPositioned())
staticPosition += toRenderBox(curr)->relativePositionOffset().width();
if (region && curr->isRenderBlock()) {
const RenderBlock* cb = toRenderBlock(curr);
region = cb->clampToStartAndEndRegions(region);
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(region);
if (boxInfo)
staticPosition += boxInfo->logicalLeft();
}
} else if (curr->isInline()) {
if (curr->isRelPositioned()) {
if (!curr->style()->logicalLeft().isAuto())
staticPosition += curr->style()->logicalLeft().value();
else
staticPosition -= curr->style()->logicalRight().value();
}
}
}
logicalLeft.setValue(Fixed, staticPosition);
} else {
RenderBox* enclosingBox = child->parent()->enclosingBox();
LayoutUnit staticPosition = child->layer()->staticInlinePosition() + containerLogicalWidth + containerBlock->borderLogicalLeft();
for (RenderObject* curr = child->parent(); curr; curr = curr->container()) {
if (curr->isBox()) {
if (curr != containerBlock) {
staticPosition -= toRenderBox(curr)->logicalLeft();
if (toRenderBox(curr)->isRelPositioned())
staticPosition -= toRenderBox(curr)->relativePositionOffset().width();
}
if (curr == enclosingBox)
staticPosition -= enclosingBox->logicalWidth();
if (region && curr->isRenderBlock()) {
const RenderBlock* cb = toRenderBlock(curr);
region = cb->clampToStartAndEndRegions(region);
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(region);
if (boxInfo) {
if (curr != containerBlock)
staticPosition -= cb->logicalWidth() - (boxInfo->logicalLeft() + boxInfo->logicalWidth());
if (curr == enclosingBox)
staticPosition += enclosingBox->logicalWidth() - boxInfo->logicalWidth();
}
}
} else if (curr->isInline()) {
if (curr->isRelPositioned()) {
if (!curr->style()->logicalLeft().isAuto())
staticPosition -= curr->style()->logicalLeft().value();
else
staticPosition += curr->style()->logicalRight().value();
}
}
if (curr == containerBlock)
break;
}
logicalRight.setValue(Fixed, staticPosition);
}
}
void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
{
if (isReplaced()) {
// FIXME: Positioned replaced elements inside a flow thread are not working properly
// with variable width regions (see https://bugs.webkit.org/show_bug.cgi?id=69896 ).
computePositionedLogicalWidthReplaced(computedValues);
return;
}
// QUESTIONS
// FIXME 1: Should we still deal with these the cases of 'left' or 'right' having
// the type 'static' in determining whether to calculate the static distance?
// NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
// FIXME 2: Can perhaps optimize out cases when max-width/min-width are greater
// than or less than the computed width(). Be careful of box-sizing and
// percentage issues.
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
// (block-style-comments in this function and in computePositionedLogicalWidthUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, region);
// Use the container block's direction except when calculating the static distance
// This conforms with the reference results for abspos-replaced-width-margin-000.htm
// of the CSS 2.1 test suite
TextDirection containerDirection = containerBlock->style()->direction();
bool isHorizontal = isHorizontalWritingMode();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
const Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
const Length marginLogicalRight = isHorizontal ? style()->marginRight() : style()->marginBottom();
Length logicalLeftLength = style()->logicalLeft();
Length logicalRightLength = style()->logicalRight();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely:
*
* * The static position for 'left' is the distance from the left edge of the
* containing block to the left margin edge of a hypothetical box that would
* have been the first box of the element if its 'position' property had
* been 'static' and 'float' had been 'none'. The value is negative if the
* hypothetical box is to the left of the containing block.
* * The static position for 'right' is the distance from the right edge of the
* containing block to the right margin edge of the same hypothetical box as
* above. The value is positive if the hypothetical box is to the left of the
* containing block's edge.
*
* But rather than actually calculating the dimensions of that hypothetical box,
* user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block of
* fixed positioned elements is the initial containing block instead of the
* viewport, and all scrollable boxes should be assumed to be scrolled to their
* origin.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computeInlineStaticDistance(logicalLeftLength, logicalRightLength, this, containerBlock, containerLogicalWidth, region);
// Calculate constraint equation values for 'width' case.
computePositionedLogicalWidthUsing(style()->logicalWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
computedValues);
// Calculate constraint equation values for 'max-width' case.
if (!style()->logicalMaxWidth().isUndefined()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalWidthUsing(style()->logicalMaxWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_start = maxValues.m_margins.m_start;
computedValues.m_margins.m_end = maxValues.m_margins.m_end;
}
}
// Calculate constraint equation values for 'min-width' case.
if (!style()->logicalMinWidth().isZero() || style()->logicalMinWidth().isIntrinsic()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalWidthUsing(style()->logicalMinWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_start = minValues.m_margins.m_start;
computedValues.m_margins.m_end = minValues.m_margins.m_end;
}
}
computedValues.m_extent += bordersPlusPadding;
// Adjust logicalLeft if we need to for the flipped version of our writing mode in regions.
// FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && !region && isWritingModeRoot() && isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode() && containerBlock->isRenderBlock()) {
ASSERT(containerBlock->canHaveBoxInfoInRegion());
LayoutUnit logicalLeftPos = computedValues.m_position;
const RenderBlock* cb = toRenderBlock(containerBlock);
LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage();
RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
if (cbRegion) {
cbRegion = cb->clampToStartAndEndRegions(cbRegion);
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(cbRegion);
if (boxInfo) {
logicalLeftPos += boxInfo->logicalLeft();
computedValues.m_position = logicalLeftPos;
}
}
}
}
static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const RenderBox* child, LayoutUnit logicalWidthValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
{
// Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
// along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
if (containerBlock->isHorizontalWritingMode() != child->isHorizontalWritingMode() && containerBlock->style()->isFlippedBlocksWritingMode()) {
logicalLeftPos = containerLogicalWidth - logicalWidthValue - logicalLeftPos;
logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderRight() : containerBlock->borderBottom());
} else
logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderLeft() : containerBlock->borderTop());
}
void RenderBox::shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues& computedValues) const
{
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalLeftValue;
computedValues.m_extent = min(max(preferredMinWidth, availableWidth), preferredWidth);
}
void RenderBox::computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
LogicalExtentComputedValues& computedValues) const
{
if (logicalWidth.isIntrinsic())
logicalWidth = Length(computeIntrinsicLogicalWidthUsing(logicalWidth, containerLogicalWidth, bordersPlusPadding) - bordersPlusPadding, Fixed);
// 'left' and 'right' cannot both be 'auto' because one would of been
// converted to the static position already
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
LayoutUnit logicalLeftValue = 0;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
bool logicalWidthIsAuto = logicalWidth.isIntrinsicOrAuto();
bool logicalLeftIsAuto = logicalLeft.isAuto();
bool logicalRightIsAuto = logicalRight.isAuto();
RenderView* renderView = view();
LayoutUnit& marginLogicalLeftValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
if (!logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three is 'auto': If both 'margin-left' and 'margin-
* right' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values, unless this would make them negative,
* in which case when direction of the containing block is 'ltr' ('rtl'),
* set 'margin-left' ('margin-right') to zero and solve for 'margin-right'
* ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto',
* solve the equation for that value. If the values are over-constrained,
* ignore the value for 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is 'ltr')
* and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'right' in the over constrained
// case because the value is not used for any further calculations.
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth, renderView));
const LayoutUnit availableSpace = containerLogicalWidth - (logicalLeftValue + computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth, renderView) + bordersPlusPadding);
// Margins are now the only unknown
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// Both margins auto, solve for equality
if (availableSpace >= 0) {
marginLogicalLeftValue = availableSpace / 2; // split the difference
marginLogicalRightValue = availableSpace - marginLogicalLeftValue; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftValue = 0;
marginLogicalRightValue = availableSpace; // will be negative
} else {
marginLogicalLeftValue = availableSpace; // will be negative
marginLogicalRightValue = 0;
}
}
} else if (marginLogicalLeft.isAuto()) {
// Solve for left margin
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
marginLogicalLeftValue = availableSpace - marginLogicalRightValue;
} else if (marginLogicalRight.isAuto()) {
// Solve for right margin
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightValue = availableSpace - marginLogicalLeftValue;
} else {
// Over-constrained, solve for left if direction is RTL
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == RTL)
logicalLeftValue = (availableSpace + logicalLeftValue) - marginLogicalLeftValue - marginLogicalRightValue;
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-left' and 'margin-right'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'left' and 'width' are 'auto' and 'right' is not 'auto', then the
* width is shrink-to-fit. Then solve for 'left'
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'left' and 'right' are 'auto' and 'width' is not 'auto', then if
* the 'direction' property of the containing block is 'ltr' set
* 'left' to the static position, otherwise set 'right' to the
* static position. Then solve for 'left' (if 'direction is 'rtl')
* or 'right' (if 'direction' is 'ltr').
* ------------------------------------------------------------------
*
* 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the
* width is shrink-to-fit . Then solve for 'right'
* 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve
* for 'left'
* 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve
* for 'width'
* 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve
* for 'right'
*
* Calculation of the shrink-to-fit width is similar to calculating the
* width of a table cell using the automatic table layout algorithm.
* Roughly: calculate the preferred width by formatting the content
* without breaking lines other than where explicit line breaks occur,
* and also calculate the preferred minimum width, e.g., by trying all
* possible line breaks. CSS 2.1 does not define the exact algorithm.
* Thirdly, calculate the available width: this is found by solving
* for 'width' after setting 'left' (in case 1) or 'right' (in case 3)
* to 0.
*
* Then the shrink-to-fit width is:
* min(max(preferred minimum width, available width), preferred width).
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'right'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
marginLogicalLeftValue = minimumValueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightValue = minimumValueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
const LayoutUnit availableSpace = containerLogicalWidth - (marginLogicalLeftValue + marginLogicalRightValue + bordersPlusPadding);
// FIXME: Is there a faster way to find the correct case?
// Use rule/case that applies.
if (logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 1: (use shrink-to-fit for width, and solve of left)
LayoutUnit logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalRightValue;
computedValues.m_extent = min(max(preferredMinWidth, availableWidth), preferredWidth);
logicalLeftValue = availableSpace - (computedValues.m_extent + logicalRightValue);
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 3: (use shrink-to-fit for width, and no need solve of right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
shrinkToFitWidth(availableSpace, logicalLeftValue, bordersPlusPadding, computedValues);
} else if (logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 4: (solve for left)
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth, renderView));
logicalLeftValue = availableSpace - (computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth, renderView));
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 5: (solve for width)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
if (autoWidthShouldFitContent())
shrinkToFitWidth(availableSpace, logicalLeftValue, bordersPlusPadding, computedValues);
else
computedValues.m_extent = availableSpace - (logicalLeftValue + valueForLength(logicalRight, containerLogicalWidth, renderView));
} else if (!logicalLeftIsAuto && !logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 6: (no need solve for right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth, renderView));
}
}
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(containerBlock);
InlineFlowBox* firstLine = flow->firstLineBox();
InlineFlowBox* lastLine = flow->lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
if (containerBlock->isBox() && toRenderBox(containerBlock)->scrollsOverflowY() && containerBlock->style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft()) {
logicalLeftValue = logicalLeftValue + toRenderBox(containerBlock)->verticalScrollbarWidth();
}
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue;
computeLogicalLeftPositionedOffset(computedValues.m_position, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
}
static void computeBlockStaticDistance(Length& logicalTop, Length& logicalBottom, const RenderBox* child, const RenderBoxModelObject* containerBlock)
{
if (!logicalTop.isAuto() || !logicalBottom.isAuto())
return;
// FIXME: The static distance computation has not been patched for mixed writing modes.
LayoutUnit staticLogicalTop = child->layer()->staticBlockPosition() - containerBlock->borderBefore();
for (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
if (curr->isBox() && !curr->isTableRow())
staticLogicalTop += toRenderBox(curr)->logicalTop();
}
logicalTop.setValue(Fixed, staticLogicalTop);
}
void RenderBox::computePositionedLogicalHeight(LogicalExtentComputedValues& computedValues) const
{
if (isReplaced()) {
computePositionedLogicalHeightReplaced(computedValues);
return;
}
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.4 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-non-replaced-height>
// (block-style-comments in this function and in computePositionedLogicalHeightUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
RenderStyle* styleToUse = style();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
const Length marginBefore = styleToUse->marginBefore();
const Length marginAfter = styleToUse->marginAfter();
Length logicalTopLength = styleToUse->logicalTop();
Length logicalBottomLength = styleToUse->logicalBottom();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely, the static position for 'top' is the
* distance from the top edge of the containing block to the top margin edge
* of a hypothetical box that would have been the first box of the element if
* its 'position' property had been 'static' and 'float' had been 'none'. The
* value is negative if the hypothetical box is above the containing block.
*
* But rather than actually calculating the dimensions of that hypothetical
* box, user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block
* of fixed positioned elements is the initial containing block instead of
* the viewport.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computeBlockStaticDistance(logicalTopLength, logicalBottomLength, this, containerBlock);
// Calculate constraint equation values for 'height' case.
LayoutUnit logicalHeight = computedValues.m_extent;
computePositionedLogicalHeightUsing(styleToUse->logicalHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
computedValues);
// Avoid doing any work in the common case (where the values of min-height and max-height are their defaults).
// see FIXME 2
// Calculate constraint equation values for 'max-height' case.
if (!styleToUse->logicalMaxHeight().isUndefined()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalHeightUsing(styleToUse->logicalMaxHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_before = maxValues.m_margins.m_before;
computedValues.m_margins.m_after = maxValues.m_margins.m_after;
}
}
// Calculate constraint equation values for 'min-height' case.
if (!styleToUse->logicalMinHeight().isZero() || styleToUse->logicalMinHeight().isIntrinsic()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalHeightUsing(styleToUse->logicalMinHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_before = minValues.m_margins.m_before;
computedValues.m_margins.m_after = minValues.m_margins.m_after;
}
}
// Set final height value.
computedValues.m_extent += bordersPlusPadding;
// Adjust logicalTop if we need to for perpendicular writing modes in regions.
// FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode() && containerBlock->isRenderBlock()) {
ASSERT(containerBlock->canHaveBoxInfoInRegion());
LayoutUnit logicalTopPos = computedValues.m_position;
const RenderBlock* cb = toRenderBlock(containerBlock);
LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage() - logicalLeft();
RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
if (cbRegion) {
cbRegion = cb->clampToStartAndEndRegions(cbRegion);
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(cbRegion);
if (boxInfo) {
logicalTopPos += boxInfo->logicalLeft();
computedValues.m_position = logicalTopPos;
}
}
}
}
static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const RenderBox* child, LayoutUnit logicalHeightValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight)
{
// Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
// along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
if ((child->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode())
|| (child->style()->isFlippedBlocksWritingMode() != containerBlock->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()))
logicalTopPos = containerLogicalHeight - logicalHeightValue - logicalTopPos;
// Our offset is from the logical bottom edge in a flipped environment, e.g., right for vertical-rl and bottom for horizontal-bt.
if (containerBlock->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()) {
if (child->isHorizontalWritingMode())
logicalTopPos += containerBlock->borderBottom();
else
logicalTopPos += containerBlock->borderRight();
} else {
if (child->isHorizontalWritingMode())
logicalTopPos += containerBlock->borderTop();
else
logicalTopPos += containerBlock->borderLeft();
}
}
void RenderBox::computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
Length logicalTop, Length logicalBottom, Length marginBefore, Length marginAfter,
LogicalExtentComputedValues& computedValues) const
{
// 'top' and 'bottom' cannot both be 'auto' because 'top would of been
// converted to the static position in computePositionedLogicalHeight()
ASSERT(!(logicalTop.isAuto() && logicalBottom.isAuto()));
LayoutUnit logicalHeightValue;
LayoutUnit contentLogicalHeight = logicalHeight - bordersPlusPadding;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
LayoutUnit logicalTopValue = 0;
bool logicalHeightIsAuto = logicalHeightLength.isAuto();
bool logicalTopIsAuto = logicalTop.isAuto();
bool logicalBottomIsAuto = logicalBottom.isAuto();
RenderView* renderView = view();
LayoutUnit resolvedLogicalHeight;
// Height is never unsolved for tables.
if (isTable()) {
resolvedLogicalHeight = contentLogicalHeight;
logicalHeightIsAuto = false;
} else {
if (logicalHeightLength.isIntrinsic())
resolvedLogicalHeight = computeIntrinsicLogicalContentHeightUsing(logicalHeightLength, contentLogicalHeight, bordersPlusPadding);
else
resolvedLogicalHeight = adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeightLength, containerLogicalHeight, renderView));
}
if (!logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three are 'auto': If both 'margin-top' and 'margin-
* bottom' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values. If one of 'margin-top' or 'margin-
* bottom' is 'auto', solve the equation for that value. If the values
* are over-constrained, ignore the value for 'bottom' and solve for that
* value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'bottom' in the over constrained
// case because the value is not used for any further calculations.
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
const LayoutUnit availableSpace = containerLogicalHeight - (logicalTopValue + logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight, renderView) + bordersPlusPadding);
// Margins are now the only unknown
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// Both margins auto, solve for equality
// NOTE: This may result in negative values.
computedValues.m_margins.m_before = availableSpace / 2; // split the difference
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before; // account for odd valued differences
} else if (marginBefore.isAuto()) {
// Solve for top margin
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
computedValues.m_margins.m_before = availableSpace - computedValues.m_margins.m_after;
} else if (marginAfter.isAuto()) {
// Solve for bottom margin
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before;
} else {
// Over-constrained, (no need solve for bottom)
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-top' and 'margin-bottom'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then
* the height is based on the content, and solve for 'top'.
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'top' and 'bottom' are 'auto' and 'height' is not 'auto', then
* set 'top' to the static position, and solve for 'bottom'.
* ------------------------------------------------------------------
*
* 3. 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then
* the height is based on the content, and solve for 'bottom'.
* 4. 'top' is 'auto', 'height' and 'bottom' are not 'auto', and
* solve for 'top'.
* 5. 'height' is 'auto', 'top' and 'bottom' are not 'auto', and
* solve for 'height'.
* 6. 'bottom' is 'auto', 'top' and 'height' are not 'auto', and
* solve for 'bottom'.
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'bottom'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
computedValues.m_margins.m_before = minimumValueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
computedValues.m_margins.m_after = minimumValueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
const LayoutUnit availableSpace = containerLogicalHeight - (computedValues.m_margins.m_before + computedValues.m_margins.m_after + bordersPlusPadding);
// Use rule/case that applies.
if (logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 1: (height is content based, solve of top)
logicalHeightValue = contentLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight, renderView));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 3: (height is content based, no need solve of bottom)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
logicalHeightValue = contentLogicalHeight;
} else if (logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 4: (solve of top)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight, renderView));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 5: (solve of height)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
logicalHeightValue = max<LayoutUnit>(0, availableSpace - (logicalTopValue + valueForLength(logicalBottom, containerLogicalHeight, renderView)));
} else if (!logicalTopIsAuto && !logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 6: (no need solve of bottom)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
}
}
computedValues.m_extent = logicalHeightValue;
// Use computed values to calculate the vertical position.
computedValues.m_position = logicalTopValue + computedValues.m_margins.m_before;
computeLogicalTopPositionedOffset(computedValues.m_position, this, logicalHeightValue, containerBlock, containerLogicalHeight);
}
void RenderBox::computePositionedLogicalWidthReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.8 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
// To match WinIE, in quirks mode use the parent's 'direction' property
// instead of the the container block's.
TextDirection containerDirection = containerBlock->style()->direction();
// Variables to solve.
bool isHorizontal = isHorizontalWritingMode();
Length logicalLeft = style()->logicalLeft();
Length logicalRight = style()->logicalRight();
Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
Length marginLogicalRight = isHorizontal ? style()->marginRight() : style()->marginBottom();
LayoutUnit& marginLogicalLeftAlias = style()->isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightAlias = style()->isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
/*-----------------------------------------------------------------------*\
* 1. The used value of 'width' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of width is FINAL in that the min/max width calculations
// are dealt with in computeReplacedWidth(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalWidth() + borderAndPaddingLogicalWidth();
const LayoutUnit availableSpace = containerLogicalWidth - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
* of the containing block is 'ltr', set 'left' to the static position;
* else if 'direction' is 'rtl', set 'right' to the static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth, 0); // FIXME: Pass the region.
/*-----------------------------------------------------------------------*\
* 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
* or 'margin-right' with '0'.
\*-----------------------------------------------------------------------*/
if (logicalLeft.isAuto() || logicalRight.isAuto()) {
if (marginLogicalLeft.isAuto())
marginLogicalLeft.setValue(Fixed, 0);
if (marginLogicalRight.isAuto())
marginLogicalRight.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-left' and 'margin-right' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values, unless this would make them negative,
* in which case when the direction of the containing block is 'ltr'
* ('rtl'), set 'margin-left' ('margin-right') to zero and solve for
* 'margin-right' ('margin-left').
\*-----------------------------------------------------------------------*/
LayoutUnit logicalLeftValue = 0;
LayoutUnit logicalRightValue = 0;
RenderView* renderView = view();
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// 'left' and 'right' cannot be 'auto' due to step 3
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
LayoutUnit difference = availableSpace - (logicalLeftValue + logicalRightValue);
if (difference > 0) {
marginLogicalLeftAlias = difference / 2; // split the difference
marginLogicalRightAlias = difference - marginLogicalLeftAlias; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftAlias = 0;
marginLogicalRightAlias = difference; // will be negative
} else {
marginLogicalLeftAlias = difference; // will be negative
marginLogicalRightAlias = 0;
}
}
/*-----------------------------------------------------------------------*\
* 5. If at this point there is an 'auto' left, solve the equation for
* that value.
\*-----------------------------------------------------------------------*/
} else if (logicalLeft.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
// Solve for 'left'
logicalLeftValue = availableSpace - (logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (logicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
// Solve for 'right'
logicalRightValue = availableSpace - (logicalLeftValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (marginLogicalLeft.isAuto()) {
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
// Solve for 'margin-left'
marginLogicalLeftAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalRightAlias);
} else if (marginLogicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
// Solve for 'margin-right'
marginLogicalRightAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalLeftAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth, renderView);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth, renderView);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth, renderView);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth, renderView);
// If the containing block is right-to-left, then push the left position as far to the right as possible
if (containerDirection == RTL) {
int totalLogicalWidth = computedValues.m_extent + logicalLeftValue + logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias;
logicalLeftValue = containerLogicalWidth - (totalLogicalWidth - logicalLeftValue);
}
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for either 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is
* 'ltr') and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: Constraints imposed by the width of the containing block and its content have already been accounted for above.
// FIXME: Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space, so that
// can make the result here rather complicated to compute.
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline containing block because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(containerBlock);
InlineFlowBox* firstLine = flow->firstLineBox();
InlineFlowBox* lastLine = flow->lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftAlias + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
LayoutUnit logicalLeftPos = logicalLeftValue + marginLogicalLeftAlias;
computeLogicalLeftPositionedOffset(logicalLeftPos, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
computedValues.m_position = logicalLeftPos;
}
void RenderBox::computePositionedLogicalHeightReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
// Variables to solve.
Length marginBefore = style()->marginBefore();
Length marginAfter = style()->marginAfter();
LayoutUnit& marginBeforeAlias = computedValues.m_margins.m_before;
LayoutUnit& marginAfterAlias = computedValues.m_margins.m_after;
Length logicalTop = style()->logicalTop();
Length logicalBottom = style()->logicalBottom();
RenderView* renderView = view();
/*-----------------------------------------------------------------------*\
* 1. The used value of 'height' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of height is FINAL in that the min/max height calculations
// are dealt with in computeReplacedHeight(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalHeight() + borderAndPaddingLogicalHeight();
const LayoutUnit availableSpace = containerLogicalHeight - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'top' and 'bottom' have the value 'auto', replace 'top'
* with the element's static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computeBlockStaticDistance(logicalTop, logicalBottom, this, containerBlock);
/*-----------------------------------------------------------------------*\
* 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
* 'margin-bottom' with '0'.
\*-----------------------------------------------------------------------*/
// FIXME: The spec. says that this step should only be taken when bottom is
// auto, but if only top is auto, this makes step 4 impossible.
if (logicalTop.isAuto() || logicalBottom.isAuto()) {
if (marginBefore.isAuto())
marginBefore.setValue(Fixed, 0);
if (marginAfter.isAuto())
marginAfter.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-top' and 'margin-bottom' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values.
\*-----------------------------------------------------------------------*/
LayoutUnit logicalTopValue = 0;
LayoutUnit logicalBottomValue = 0;
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combined.
ASSERT(!(logicalTop.isAuto() || logicalBottom.isAuto()));
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight, renderView);
LayoutUnit difference = availableSpace - (logicalTopValue + logicalBottomValue);
// NOTE: This may result in negative values.
marginBeforeAlias = difference / 2; // split the difference
marginAfterAlias = difference - marginBeforeAlias; // account for odd valued differences
/*-----------------------------------------------------------------------*\
* 5. If at this point there is only one 'auto' left, solve the equation
* for that value.
\*-----------------------------------------------------------------------*/
} else if (logicalTop.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight, renderView);
// Solve for 'top'
logicalTopValue = availableSpace - (logicalBottomValue + marginBeforeAlias + marginAfterAlias);
} else if (logicalBottom.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
// Solve for 'bottom'
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
} else if (marginBefore.isAuto()) {
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight, renderView);
// Solve for 'margin-top'
marginBeforeAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginAfterAlias);
} else if (marginAfter.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight, renderView);
// Solve for 'margin-bottom'
marginAfterAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginBeforeAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth, renderView);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth, renderView);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight, renderView);
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for 'bottom' and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to do this step because we don't end up using
// the value of 'bottom' regardless of whether the values are over-constrained
// or not.
// Use computed values to calculate the vertical position.
LayoutUnit logicalTopPos = logicalTopValue + marginBeforeAlias;
computeLogicalTopPositionedOffset(logicalTopPos, this, computedValues.m_extent, containerBlock, containerLogicalHeight);
computedValues.m_position = logicalTopPos;
}
LayoutRect RenderBox::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit* extraWidthToEndOfLine)
{
// VisiblePositions at offsets inside containers either a) refer to the positions before/after
// those containers (tables and select elements) or b) refer to the position inside an empty block.
// They never refer to children.
// FIXME: Paint the carets inside empty blocks differently than the carets before/after elements.
LayoutRect rect(location(), LayoutSize(caretWidth, height()));
bool ltr = box ? box->isLeftToRightDirection() : style()->isLeftToRightDirection();
if ((!caretOffset) ^ ltr)
rect.move(LayoutSize(width() - caretWidth, 0));
if (box) {
RootInlineBox* rootBox = box->root();
LayoutUnit top = rootBox->lineTop();
rect.setY(top);
rect.setHeight(rootBox->lineBottom() - top);
}
// If height of box is smaller than font height, use the latter one,
// otherwise the caret might become invisible.
//
// Also, if the box is not a replaced element, always use the font height.
// This prevents the "big caret" bug described in:
// <rdar://problem/3777804> Deleting all content in a document can result in giant tall-as-window insertion point
//
// FIXME: ignoring :first-line, missing good reason to take care of
LayoutUnit fontHeight = style()->fontMetrics().height();
if (fontHeight > rect.height() || (!isReplaced() && !isTable()))
rect.setHeight(fontHeight);
if (extraWidthToEndOfLine)
*extraWidthToEndOfLine = x() + width() - rect.maxX();
// Move to local coords
rect.moveBy(-location());
// FIXME: Border/padding should be added for all elements but this workaround
// is needed because we use offsets inside an "atomic" element to represent
// positions before and after the element in deprecated editing offsets.
if (node() && !(editingIgnoresContent(node()) || isTableElement(node()))) {
rect.setX(rect.x() + borderLeft() + paddingLeft());
rect.setY(rect.y() + paddingTop() + borderTop());
}
if (!isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
PositionWithAffinity RenderBox::positionForPoint(const LayoutPoint& point)
{
// no children...return this render object's element, if there is one, and offset 0
if (!firstChild())
return createPositionWithAffinity(nonPseudoNode() ? firstPositionInOrBeforeNode(nonPseudoNode()) : Position());
if (isTable() && nonPseudoNode()) {
LayoutUnit right = contentWidth() + borderAndPaddingWidth();
LayoutUnit bottom = contentHeight() + borderAndPaddingHeight();
if (point.x() < 0 || point.x() > right || point.y() < 0 || point.y() > bottom) {
if (point.x() <= right / 2)
return createPositionWithAffinity(firstPositionInOrBeforeNode(nonPseudoNode()));
return createPositionWithAffinity(lastPositionInOrAfterNode(nonPseudoNode()));
}
}
// Pass off to the closest child.
LayoutUnit minDist = LayoutUnit::max();
RenderBox* closestRenderer = 0;
LayoutPoint adjustedPoint = point;
if (isTableRow())
adjustedPoint.moveBy(location());
for (RenderObject* renderObject = firstChild(); renderObject; renderObject = renderObject->nextSibling()) {
if ((!renderObject->firstChild() && !renderObject->isInline() && !renderObject->isRenderBlockFlow() )
|| renderObject->style()->visibility() != VISIBLE)
continue;
if (!renderObject->isBox())
continue;
RenderBox* renderer = toRenderBox(renderObject);
LayoutUnit top = renderer->borderTop() + renderer->paddingTop() + (isTableRow() ? LayoutUnit() : renderer->y());
LayoutUnit bottom = top + renderer->contentHeight();
LayoutUnit left = renderer->borderLeft() + renderer->paddingLeft() + (isTableRow() ? LayoutUnit() : renderer->x());
LayoutUnit right = left + renderer->contentWidth();
if (point.x() <= right && point.x() >= left && point.y() <= top && point.y() >= bottom) {
if (renderer->isTableRow())
return renderer->positionForPoint(point + adjustedPoint - renderer->locationOffset());
return renderer->positionForPoint(point - renderer->locationOffset());
}
// Find the distance from (x, y) to the box. Split the space around the box into 8 pieces
// and use a different compare depending on which piece (x, y) is in.
LayoutPoint cmp;
if (point.x() > right) {
if (point.y() < top)
cmp = LayoutPoint(right, top);
else if (point.y() > bottom)
cmp = LayoutPoint(right, bottom);
else
cmp = LayoutPoint(right, point.y());
} else if (point.x() < left) {
if (point.y() < top)
cmp = LayoutPoint(left, top);
else if (point.y() > bottom)
cmp = LayoutPoint(left, bottom);
else
cmp = LayoutPoint(left, point.y());
} else {
if (point.y() < top)
cmp = LayoutPoint(point.x(), top);
else
cmp = LayoutPoint(point.x(), bottom);
}
LayoutSize difference = cmp - point;
LayoutUnit dist = difference.width() * difference.width() + difference.height() * difference.height();
if (dist < minDist) {
closestRenderer = renderer;
minDist = dist;
}
}
if (closestRenderer)
return closestRenderer->positionForPoint(adjustedPoint - closestRenderer->locationOffset());
return createPositionWithAffinity(firstPositionInOrBeforeNode(nonPseudoNode()));
}
bool RenderBox::shrinkToAvoidFloats() const
{
// Floating objects don't shrink. Objects that don't avoid floats don't shrink. Marquees don't shrink.
if ((isInline() && !isMarquee()) || !avoidsFloats() || isFloating())
return false;
// Only auto width objects can possibly shrink to avoid floats.
return style()->width().isAuto();
}
bool RenderBox::avoidsFloats() const
{
return isReplaced() || hasOverflowClip() || isHR() || isLegend() || isWritingModeRoot() || isFlexItemIncludingDeprecated();
}
void RenderBox::addVisualEffectOverflow()
{
if (!style()->boxShadow() && !style()->hasBorderImageOutsets())
return;
bool isFlipped = style()->isFlippedBlocksWritingMode();
bool isHorizontal = isHorizontalWritingMode();
LayoutRect borderBox = borderBoxRect();
LayoutUnit overflowMinX = borderBox.x();
LayoutUnit overflowMaxX = borderBox.maxX();
LayoutUnit overflowMinY = borderBox.y();
LayoutUnit overflowMaxY = borderBox.maxY();
// Compute box-shadow overflow first.
if (style()->boxShadow()) {
LayoutUnit shadowLeft;
LayoutUnit shadowRight;
LayoutUnit shadowTop;
LayoutUnit shadowBottom;
style()->getBoxShadowExtent(shadowTop, shadowRight, shadowBottom, shadowLeft);
// In flipped blocks writing modes such as vertical-rl, the physical right shadow value is actually at the lower x-coordinate.
overflowMinX = borderBox.x() + ((!isFlipped || isHorizontal) ? shadowLeft : -shadowRight);
overflowMaxX = borderBox.maxX() + ((!isFlipped || isHorizontal) ? shadowRight : -shadowLeft);
overflowMinY = borderBox.y() + ((!isFlipped || !isHorizontal) ? shadowTop : -shadowBottom);
overflowMaxY = borderBox.maxY() + ((!isFlipped || !isHorizontal) ? shadowBottom : -shadowTop);
}
// Now compute border-image-outset overflow.
if (style()->hasBorderImageOutsets()) {
LayoutBoxExtent borderOutsets = style()->borderImageOutsets();
// In flipped blocks writing modes, the physical sides are inverted. For example in vertical-rl, the right
// border is at the lower x coordinate value.
overflowMinX = min(overflowMinX, borderBox.x() - ((!isFlipped || isHorizontal) ? borderOutsets.left() : borderOutsets.right()));
overflowMaxX = max(overflowMaxX, borderBox.maxX() + ((!isFlipped || isHorizontal) ? borderOutsets.right() : borderOutsets.left()));
overflowMinY = min(overflowMinY, borderBox.y() - ((!isFlipped || !isHorizontal) ? borderOutsets.top() : borderOutsets.bottom()));
overflowMaxY = max(overflowMaxY, borderBox.maxY() + ((!isFlipped || !isHorizontal) ? borderOutsets.bottom() : borderOutsets.top()));
}
// Add in the final overflow with shadows and outsets combined.
LayoutRect visualEffectOverflow(overflowMinX, overflowMinY, overflowMaxX - overflowMinX, overflowMaxY - overflowMinY);
addVisualOverflow(visualEffectOverflow);
}
void RenderBox::addOverflowFromChild(RenderBox* child, const LayoutSize& delta)
{
// Never allow flow threads to propagate overflow up to a parent.
if (child->isRenderFlowThread())
return;
// Only propagate layout overflow from the child if the child isn't clipping its overflow. If it is, then
// its overflow is internal to it, and we don't care about it. layoutOverflowRectForPropagation takes care of this
// and just propagates the border box rect instead.
LayoutRect childLayoutOverflowRect = child->layoutOverflowRectForPropagation(style());
childLayoutOverflowRect.move(delta);
addLayoutOverflow(childLayoutOverflowRect);
// Add in visual overflow from the child. Even if the child clips its overflow, it may still
// have visual overflow of its own set from box shadows or reflections. It is unnecessary to propagate this
// overflow if we are clipping our own overflow.
if (child->hasSelfPaintingLayer())
return;
LayoutRect childVisualOverflowRect = child->visualOverflowRectForPropagation(style());
childVisualOverflowRect.move(delta);
addContentsVisualOverflow(childVisualOverflowRect);
}
void RenderBox::addLayoutOverflow(const LayoutRect& rect)
{
LayoutRect clientBox = noOverflowRect();
if (clientBox.contains(rect) || rect.isEmpty())
return;
// For overflow clip objects, we don't want to propagate overflow into unreachable areas.
LayoutRect overflowRect(rect);
if (hasOverflowClip() || isRenderView()) {
// Overflow is in the block's coordinate space and thus is flipped for horizontal-bt and vertical-rl
// writing modes. At this stage that is actually a simplification, since we can treat horizontal-tb/bt as the same
// and vertical-lr/rl as the same.
bool hasTopOverflow = !style()->isLeftToRightDirection() && !isHorizontalWritingMode();
bool hasLeftOverflow = !style()->isLeftToRightDirection() && isHorizontalWritingMode();
if (isFlexibleBox() && style()->isReverseFlexDirection()) {
RenderFlexibleBox* flexibleBox = toRenderFlexibleBox(this);
if (flexibleBox->isHorizontalFlow())
hasLeftOverflow = true;
else
hasTopOverflow = true;
}
if (hasColumns() && style()->columnProgression() == ReverseColumnProgression) {
if (isHorizontalWritingMode() ^ !style()->hasInlineColumnAxis())
hasLeftOverflow = !hasLeftOverflow;
else
hasTopOverflow = !hasTopOverflow;
}
if (!hasTopOverflow)
overflowRect.shiftYEdgeTo(max(overflowRect.y(), clientBox.y()));
else
overflowRect.shiftMaxYEdgeTo(min(overflowRect.maxY(), clientBox.maxY()));
if (!hasLeftOverflow)
overflowRect.shiftXEdgeTo(max(overflowRect.x(), clientBox.x()));
else
overflowRect.shiftMaxXEdgeTo(min(overflowRect.maxX(), clientBox.maxX()));
// Now re-test with the adjusted rectangle and see if it has become unreachable or fully
// contained.
if (clientBox.contains(overflowRect) || overflowRect.isEmpty())
return;
}
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(clientBox, borderBoxRect()));
m_overflow->addLayoutOverflow(overflowRect);
}
void RenderBox::addVisualOverflow(const LayoutRect& rect)
{
LayoutRect borderBox = borderBoxRect();
if (borderBox.contains(rect) || rect.isEmpty())
return;
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(noOverflowRect(), borderBox));
m_overflow->addVisualOverflow(rect);
}
void RenderBox::addContentsVisualOverflow(const LayoutRect& rect)
{
if (!hasOverflowClip()) {
addVisualOverflow(rect);
return;
}
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(clientBoxRect(), borderBoxRect()));
m_overflow->addContentsVisualOverflow(rect);
}
void RenderBox::clearLayoutOverflow()
{
if (!m_overflow)
return;
if (!hasVisualOverflow() && contentsVisualOverflowRect().isEmpty()) {
m_overflow.clear();
return;
}
m_overflow->setLayoutOverflow(noOverflowRect());
}
inline static bool percentageLogicalHeightIsResolvable(const RenderBox* box)
{
return RenderBox::percentageLogicalHeightIsResolvableFromBlock(box->containingBlock(), box->isOutOfFlowPositioned());
}
bool RenderBox::percentageLogicalHeightIsResolvableFromBlock(const RenderBlock* containingBlock, bool isOutOfFlowPositioned)
{
// In quirks mode, blocks with auto height are skipped, and we keep looking for an enclosing
// block that may have a specified height and then use it. In strict mode, this violates the
// specification, which states that percentage heights just revert to auto if the containing
// block has an auto height. We still skip anonymous containing blocks in both modes, though, and look
// only at explicit containers.
const RenderBlock* cb = containingBlock;
bool inQuirksMode = cb->document().inQuirksMode();
while (!cb->isRenderView() && !cb->isBody() && !cb->isTableCell() && !cb->isOutOfFlowPositioned() && cb->style()->logicalHeight().isAuto()) {
if (!inQuirksMode && !cb->isAnonymousBlock())
break;
cb = cb->containingBlock();
}
// A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
// explicitly specified that can be used for any percentage computations.
// FIXME: We can't just check top/bottom here.
// https://bugs.webkit.org/show_bug.cgi?id=46500
bool isOutOfFlowPositionedWithSpecifiedHeight = cb->isOutOfFlowPositioned() && (!cb->style()->logicalHeight().isAuto() || (!cb->style()->top().isAuto() && !cb->style()->bottom().isAuto()));
// Table cells violate what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not. We just always make ourselves
// be a percentage of the cell's current content height.
if (cb->isTableCell())
return true;
// Otherwise we only use our percentage height if our containing block had a specified
// height.
if (cb->style()->logicalHeight().isFixed())
return true;
if (cb->style()->logicalHeight().isPercent() && !isOutOfFlowPositionedWithSpecifiedHeight)
return percentageLogicalHeightIsResolvableFromBlock(cb->containingBlock(), cb->isOutOfFlowPositioned());
if (cb->isRenderView() || inQuirksMode || isOutOfFlowPositionedWithSpecifiedHeight)
return true;
if (cb->isRoot() && isOutOfFlowPositioned) {
// Match the positioned objects behavior, which is that positioned objects will fill their viewport
// always. Note we could only hit this case by recurring into computePercentageLogicalHeight on a positioned containing block.
return true;
}
return false;
}
bool RenderBox::hasUnsplittableScrollingOverflow() const
{
// We will paginate as long as we don't scroll overflow in the pagination direction.
bool isHorizontal = isHorizontalWritingMode();
if ((isHorizontal && !scrollsOverflowY()) || (!isHorizontal && !scrollsOverflowX()))
return false;
// We do have overflow. We'll still be willing to paginate as long as the block
// has auto logical height, auto or undefined max-logical-height and a zero or auto min-logical-height.
// Note this is just a heuristic, and it's still possible to have overflow under these
// conditions, but it should work out to be good enough for common cases. Paginating overflow
// with scrollbars present is not the end of the world and is what we used to do in the old model anyway.
return !style()->logicalHeight().isIntrinsicOrAuto()
|| (!style()->logicalMaxHeight().isIntrinsicOrAuto() && !style()->logicalMaxHeight().isUndefined() && (!style()->logicalMaxHeight().isPercent() || percentageLogicalHeightIsResolvable(this)))
|| (!style()->logicalMinHeight().isIntrinsicOrAuto() && style()->logicalMinHeight().isPositive() && (!style()->logicalMinHeight().isPercent() || percentageLogicalHeightIsResolvable(this)));
}
bool RenderBox::isUnsplittableForPagination() const
{
return isReplaced() || hasUnsplittableScrollingOverflow() || (parent() && isWritingModeRoot());
}
LayoutUnit RenderBox::lineHeight(bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
{
if (isReplaced())
return direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
return 0;
}
int RenderBox::baselinePosition(FontBaseline baselineType, bool /*firstLine*/, LineDirectionMode direction, LinePositionMode linePositionMode) const
{
ASSERT(linePositionMode == PositionOnContainingLine);
if (isReplaced()) {
int result = direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
if (baselineType == AlphabeticBaseline)
return result;
return result - result / 2;
}
return 0;
}
RenderLayer* RenderBox::enclosingFloatPaintingLayer() const
{
const RenderObject* curr = this;
while (curr) {
RenderLayer* layer = curr->hasLayer() && curr->isBox() ? toRenderBox(curr)->layer() : 0;
if (layer && layer->isSelfPaintingLayer())
return layer;
curr = curr->parent();
}
return 0;
}
LayoutRect RenderBox::logicalVisualOverflowRectForPropagation(RenderStyle* parentStyle) const
{
LayoutRect rect = visualOverflowRectForPropagation(parentStyle);
if (!parentStyle->isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
LayoutRect RenderBox::visualOverflowRectForPropagation(RenderStyle* parentStyle) const
{
// If the writing modes of the child and parent match, then we don't have to
// do anything fancy. Just return the result.
LayoutRect rect = visualOverflowRect();
if (parentStyle->writingMode() == style()->writingMode())
return rect;
// We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
// in a particular axis, then we have to flip the rect along that axis.
if (style()->writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
rect.setX(width() - rect.maxX());
else if (style()->writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
rect.setY(height() - rect.maxY());
return rect;
}
LayoutRect RenderBox::logicalLayoutOverflowRectForPropagation(RenderStyle* parentStyle) const
{
LayoutRect rect = layoutOverflowRectForPropagation(parentStyle);
if (!parentStyle->isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
LayoutRect RenderBox::layoutOverflowRectForPropagation(RenderStyle* parentStyle) const
{
// Only propagate interior layout overflow if we don't clip it.
LayoutRect rect = borderBoxRect();
if (!hasOverflowClip())
rect.unite(layoutOverflowRect());
bool hasTransform = hasLayer() && layer()->transform();
if (isInFlowPositioned() || hasTransform) {
// If we are relatively positioned or if we have a transform, then we have to convert
// this rectangle into physical coordinates, apply relative positioning and transforms
// to it, and then convert it back.
flipForWritingMode(rect);
if (hasTransform)
rect = layer()->currentTransform().mapRect(rect);
if (isInFlowPositioned())
rect.move(offsetForInFlowPosition());
// Now we need to flip back.
flipForWritingMode(rect);
}
// If the writing modes of the child and parent match, then we don't have to
// do anything fancy. Just return the result.
if (parentStyle->writingMode() == style()->writingMode())
return rect;
// We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
// in a particular axis, then we have to flip the rect along that axis.
if (style()->writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
rect.setX(width() - rect.maxX());
else if (style()->writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
rect.setY(height() - rect.maxY());
return rect;
}
LayoutRect RenderBox::noOverflowRect() const
{
// Because of the special coodinate system used for overflow rectangles and many other
// rectangles (not quite logical, not quite physical), we need to flip the block progression
// coordinate in vertical-rl and horizontal-bt writing modes. In other words, the rectangle
// returned is physical, except for the block direction progression coordinate (y in horizontal
// writing modes, x in vertical writing modes), which is always "logical top". Apart from the
// flipping, this method does the same as clientBoxRect().
LayoutUnit left = borderLeft();
LayoutUnit top = borderTop();
LayoutUnit right = borderRight();
LayoutUnit bottom = borderBottom();
LayoutRect rect(left, top, width() - left - right, height() - top - bottom);
flipForWritingMode(rect);
// Subtract space occupied by scrollbars. Order is important here: first flip, then subtract
// scrollbars. This may seem backwards and weird, since one would think that a horizontal
// scrollbar at the physical bottom in horizontal-bt ought to be at the logical top (physical
// bottom), between the logical top (physical bottom) border and the logical top (physical
// bottom) padding. But this is how the rest of the code expects us to behave. This is highly
// related to https://bugs.webkit.org/show_bug.cgi?id=76129
// FIXME: when the above mentioned bug is fixed, it should hopefully be possible to call
// clientBoxRect() or paddingBoxRect() in this method, rather than fiddling with the edges on
// our own.
rect.contract(verticalScrollbarWidth(), horizontalScrollbarHeight());
return rect;
}
LayoutRect RenderBox::overflowRectForPaintRejection() const
{
LayoutRect overflowRect = visualOverflowRect();
if (!m_overflow || !usesCompositedScrolling())
return overflowRect;
overflowRect.unite(layoutOverflowRect());
overflowRect.move(-scrolledContentOffset());
return overflowRect;
}
LayoutUnit RenderBox::offsetLeft() const
{
return adjustedPositionRelativeToOffsetParent(topLeftLocation()).x();
}
LayoutUnit RenderBox::offsetTop() const
{
return adjustedPositionRelativeToOffsetParent(topLeftLocation()).y();
}
LayoutPoint RenderBox::flipForWritingModeForChild(const RenderBox* child, const LayoutPoint& point) const
{
if (!style()->isFlippedBlocksWritingMode())
return point;
// The child is going to add in its x() and y(), so we have to make sure it ends up in
// the right place.
if (isHorizontalWritingMode())
return LayoutPoint(point.x(), point.y() + height() - child->height() - (2 * child->y()));
return LayoutPoint(point.x() + width() - child->width() - (2 * child->x()), point.y());
}
void RenderBox::flipForWritingMode(LayoutRect& rect) const
{
if (!style()->isFlippedBlocksWritingMode())
return;
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
else
rect.setX(width() - rect.maxX());
}
LayoutUnit RenderBox::flipForWritingMode(LayoutUnit position) const
{
if (!style()->isFlippedBlocksWritingMode())
return position;
return logicalHeight() - position;
}
LayoutPoint RenderBox::flipForWritingMode(const LayoutPoint& position) const
{
if (!style()->isFlippedBlocksWritingMode())
return position;
return isHorizontalWritingMode() ? LayoutPoint(position.x(), height() - position.y()) : LayoutPoint(width() - position.x(), position.y());
}
LayoutPoint RenderBox::flipForWritingModeIncludingColumns(const LayoutPoint& point) const
{
if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
return flipForWritingMode(point);
return toRenderBlock(this)->flipForWritingModeIncludingColumns(point);
}
LayoutSize RenderBox::flipForWritingMode(const LayoutSize& offset) const
{
if (!style()->isFlippedBlocksWritingMode())
return offset;
return isHorizontalWritingMode() ? LayoutSize(offset.width(), height() - offset.height()) : LayoutSize(width() - offset.width(), offset.height());
}
FloatPoint RenderBox::flipForWritingMode(const FloatPoint& position) const
{
if (!style()->isFlippedBlocksWritingMode())
return position;
return isHorizontalWritingMode() ? FloatPoint(position.x(), height() - position.y()) : FloatPoint(width() - position.x(), position.y());
}
void RenderBox::flipForWritingMode(FloatRect& rect) const
{
if (!style()->isFlippedBlocksWritingMode())
return;
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
else
rect.setX(width() - rect.maxX());
}
LayoutPoint RenderBox::topLeftLocation() const
{
RenderBlock* containerBlock = containingBlock();
if (!containerBlock || containerBlock == this)
return location();
return containerBlock->flipForWritingModeForChild(this, location());
}
LayoutSize RenderBox::topLeftLocationOffset() const
{
RenderBlock* containerBlock = containingBlock();
if (!containerBlock || containerBlock == this)
return locationOffset();
LayoutRect rect(frameRect());
containerBlock->flipForWritingMode(rect); // FIXME: This is wrong if we are an absolutely positioned object enclosed by a relative-positioned inline.
return LayoutSize(rect.x(), rect.y());
}
bool RenderBox::hasRelativeDimensions() const
{
// FIXME: This should probably include viewport percentage heights as well.
return style()->height().isPercent() || style()->width().isPercent()
|| style()->maxHeight().isPercent() || style()->maxWidth().isPercent()
|| style()->minHeight().isPercent() || style()->minWidth().isPercent();
}
bool RenderBox::hasRelativeLogicalHeight() const
{
return style()->logicalHeight().isPercent()
|| style()->logicalMinHeight().isPercent()
|| style()->logicalMaxHeight().isPercent()
|| style()->logicalHeight().isViewportPercentage()
|| style()->logicalMinHeight().isViewportPercentage()
|| style()->logicalMaxHeight().isViewportPercentage();
}
static void markBoxForRelayoutAfterSplit(RenderBox* box)
{
// FIXME: The table code should handle that automatically. If not,
// we should fix it and remove the table part checks.
if (box->isTable()) {
// Because we may have added some sections with already computed column structures, we need to
// sync the table structure with them now. This avoids crashes when adding new cells to the table.
toRenderTable(box)->forceSectionsRecalc();
} else if (box->isTableSection())
toRenderTableSection(box)->setNeedsCellRecalc();
box->setNeedsLayoutAndPrefWidthsRecalc();
}
RenderObject* RenderBox::splitAnonymousBoxesAroundChild(RenderObject* beforeChild)
{
bool didSplitParentAnonymousBoxes = false;
while (beforeChild->parent() != this) {
RenderBox* boxToSplit = toRenderBox(beforeChild->parent());
if (boxToSplit->firstChild() != beforeChild && boxToSplit->isAnonymous()) {
didSplitParentAnonymousBoxes = true;
// We have to split the parent box into two boxes and move children
// from |beforeChild| to end into the new post box.
RenderBox* postBox = boxToSplit->createAnonymousBoxWithSameTypeAs(this);
postBox->setChildrenInline(boxToSplit->childrenInline());
RenderBox* parentBox = toRenderBox(boxToSplit->parent());
// We need to invalidate the |parentBox| before inserting the new node
// so that the table repainting logic knows the structure is dirty.
// See for example RenderTableCell:clippedOverflowRectForRepaint.
markBoxForRelayoutAfterSplit(parentBox);
parentBox->virtualChildren()->insertChildNode(parentBox, postBox, boxToSplit->nextSibling());
boxToSplit->moveChildrenTo(postBox, beforeChild, 0, true);
markBoxForRelayoutAfterSplit(boxToSplit);
markBoxForRelayoutAfterSplit(postBox);
beforeChild = postBox;
} else
beforeChild = boxToSplit;
}
if (didSplitParentAnonymousBoxes)
markBoxForRelayoutAfterSplit(this);
ASSERT(beforeChild->parent() == this);
return beforeChild;
}
LayoutUnit RenderBox::offsetFromLogicalTopOfFirstPage() const
{
LayoutState* layoutState = view()->layoutState();
if (layoutState && !layoutState->isPaginated())
return 0;
if (!layoutState && !flowThreadContainingBlock())
return 0;
RenderBlock* containerBlock = containingBlock();
return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
}
} // namespace WebCore