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* Copyright (C) 1999 Lars Knoll (
* (C) 1999 Antti Koivisto (
* Copyright (C) 2003, 2006, 2007 Apple Inc. 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
* 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.
#ifndef RenderBox_h
#define RenderBox_h
#include "core/rendering/RenderBoxModelObject.h"
#include "core/rendering/RenderOverflow.h"
#include "core/rendering/shapes/ShapeOutsideInfo.h"
#include "platform/scroll/ScrollTypes.h"
namespace blink {
struct PaintInfo;
enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
enum MarginDirection { BlockDirection, InlineDirection };
enum ShouldComputePreferred { ComputeActual, ComputePreferred };
enum ScrollOffsetClamping {
struct RenderBoxRareData {
: m_inlineBoxWrapper(0)
, m_overrideLogicalContentHeight(-1)
, m_overrideLogicalContentWidth(-1)
, m_previousBorderBoxSize(-1, -1)
// For inline replaced elements, the inline box that owns us.
InlineBox* m_inlineBoxWrapper;
LayoutUnit m_overrideLogicalContentHeight;
LayoutUnit m_overrideLogicalContentWidth;
// Set by RenderBox::updatePreviousBorderBoxSizeIfNeeded().
LayoutSize m_previousBorderBoxSize;
class RenderBox : public RenderBoxModelObject {
explicit RenderBox(ContainerNode*);
// hasAutoZIndex only returns true if the element is positioned or a flex-item since
// position:static elements that are not flex-items get their z-index coerced to auto.
virtual LayerType layerTypeRequired() const override
if (isPositioned() || createsGroup() || hasClipPath() || hasTransformRelatedProperty() || hasHiddenBackface() || hasReflection() || style()->specifiesColumns() || !style()->hasAutoZIndex() || style()->shouldCompositeForCurrentAnimations())
return NormalLayer;
if (hasOverflowClip())
return OverflowClipLayer;
return NoLayer;
virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const override;
// Use this with caution! No type checking is done!
RenderBox* firstChildBox() const;
RenderBox* lastChildBox() const;
LayoutUnit x() const { return m_frameRect.x(); }
LayoutUnit y() const { return m_frameRect.y(); }
LayoutUnit width() const { return m_frameRect.width(); }
LayoutUnit height() const { return m_frameRect.height(); }
int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); }
int pixelSnappedHeight() const { return m_frameRect.pixelSnappedHeight(); }
void setX(LayoutUnit x) { m_frameRect.setX(x); }
void setY(LayoutUnit y) { m_frameRect.setY(y); }
void setWidth(LayoutUnit width) { m_frameRect.setWidth(width); }
void setHeight(LayoutUnit height) { m_frameRect.setHeight(height); }
LayoutUnit logicalLeft() const { return style()->isHorizontalWritingMode() ? x() : y(); }
LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); }
LayoutUnit logicalTop() const { return style()->isHorizontalWritingMode() ? y() : x(); }
LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); }
LayoutUnit logicalWidth() const { return style()->isHorizontalWritingMode() ? width() : height(); }
LayoutUnit logicalHeight() const { return style()->isHorizontalWritingMode() ? height() : width(); }
LayoutUnit constrainLogicalWidthByMinMax(LayoutUnit, LayoutUnit, RenderBlock*) const;
LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
int pixelSnappedLogicalHeight() const { return style()->isHorizontalWritingMode() ? pixelSnappedHeight() : pixelSnappedWidth(); }
int pixelSnappedLogicalWidth() const { return style()->isHorizontalWritingMode() ? pixelSnappedWidth() : pixelSnappedHeight(); }
void setLogicalLeft(LayoutUnit left)
if (style()->isHorizontalWritingMode())
void setLogicalTop(LayoutUnit top)
if (style()->isHorizontalWritingMode())
void setLogicalLocation(const LayoutPoint& location)
if (style()->isHorizontalWritingMode())
void setLogicalWidth(LayoutUnit size)
if (style()->isHorizontalWritingMode())
void setLogicalHeight(LayoutUnit size)
if (style()->isHorizontalWritingMode())
LayoutPoint location() const { return m_frameRect.location(); }
LayoutSize locationOffset() const { return LayoutSize(x(), y()); }
LayoutSize size() const { return m_frameRect.size(); }
IntSize pixelSnappedSize() const { return m_frameRect.pixelSnappedSize(); }
void setLocation(const LayoutPoint& location) { m_frameRect.setLocation(location); }
void setSize(const LayoutSize& size) { m_frameRect.setSize(size); }
void move(LayoutUnit dx, LayoutUnit dy) { m_frameRect.move(dx, dy); }
LayoutRect frameRect() const { return m_frameRect; }
void setFrameRect(const LayoutRect& rect) { m_frameRect = rect; }
LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); }
LayoutRect paddingBoxRect() const { return LayoutRect(borderLeft(), borderTop(), clientWidth(), clientHeight()); }
IntRect pixelSnappedBorderBoxRect() const { return IntRect(IntPoint(), m_frameRect.pixelSnappedSize()); }
virtual IntRect borderBoundingBox() const override final { return pixelSnappedBorderBoxRect(); }
// The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border).
LayoutRect contentBoxRect() const { return LayoutRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); }
// The content box in absolute coords. Ignores transforms.
IntRect absoluteContentBox() const;
// The content box converted to absolute coords (taking transforms into account).
FloatQuad absoluteContentQuad() const;
// This returns the content area of the box (excluding padding and border). The only difference with contentBoxRect is that computedCSSContentBoxRect
// does include the intrinsic padding in the content box as this is what some callers expect (like getComputedStyle).
LayoutRect computedCSSContentBoxRect() const { return LayoutRect(borderLeft() + computedCSSPaddingLeft(), borderTop() + computedCSSPaddingTop(), clientWidth() - computedCSSPaddingLeft() - computedCSSPaddingRight(), clientHeight() - computedCSSPaddingTop() - computedCSSPaddingBottom()); }
virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const override;
// Use this with caution! No type checking is done!
RenderBox* previousSiblingBox() const;
RenderBox* nextSiblingBox() const;
RenderBox* parentBox() const;
bool canResize() const;
// Visual and layout overflow are in the coordinate space of the box. This means that they aren't purely physical directions.
// For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right
// respectively are flipped when compared to their physical counterparts. For example minX is on the left in vertical-lr,
// but it is on the right in vertical-rl.
LayoutRect noOverflowRect() const;
LayoutRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : noOverflowRect(); }
IntRect pixelSnappedLayoutOverflowRect() const { return pixelSnappedIntRect(layoutOverflowRect()); }
LayoutSize maxLayoutOverflow() const { return LayoutSize(layoutOverflowRect().maxX(), layoutOverflowRect().maxY()); }
LayoutUnit logicalLeftLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().x() : layoutOverflowRect().y(); }
LayoutUnit logicalRightLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().maxX() : layoutOverflowRect().maxY(); }
virtual LayoutRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); }
LayoutUnit logicalLeftVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().x() : visualOverflowRect().y(); }
LayoutUnit logicalRightVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().maxX() : visualOverflowRect().maxY(); }
LayoutRect contentsVisualOverflowRect() const { return m_overflow ? m_overflow->contentsVisualOverflowRect() : LayoutRect(); }
void addLayoutOverflow(const LayoutRect&);
void addVisualOverflow(const LayoutRect&);
// Clipped by the contents clip, if one exists.
void addContentsVisualOverflow(const LayoutRect&);
void addVisualEffectOverflow();
LayoutBoxExtent computeVisualEffectOverflowExtent() const;
void addOverflowFromChild(RenderBox* child) { addOverflowFromChild(child, child->locationOffset()); }
void addOverflowFromChild(RenderBox* child, const LayoutSize& delta);
void clearLayoutOverflow();
void clearAllOverflows() { m_overflow.clear(); }
void updateLayerTransformAfterLayout();
LayoutUnit contentWidth() const { return clientWidth() - paddingLeft() - paddingRight(); }
LayoutUnit contentHeight() const { return clientHeight() - paddingTop() - paddingBottom(); }
LayoutUnit contentLogicalWidth() const { return style()->isHorizontalWritingMode() ? contentWidth() : contentHeight(); }
LayoutUnit contentLogicalHeight() const { return style()->isHorizontalWritingMode() ? contentHeight() : contentWidth(); }
// IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (RenderFlow)
// to return the remaining width on a given line (and the height of a single line).
virtual LayoutUnit offsetWidth() const override { return width(); }
virtual LayoutUnit offsetHeight() const override { return height(); }
virtual int pixelSnappedOffsetWidth() const override final;
virtual int pixelSnappedOffsetHeight() const override final;
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar. clientLeft/Top are just the borderLeftWidth and borderTopWidth.
LayoutUnit clientLeft() const { return borderLeft() + (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft() ? verticalScrollbarWidth() : 0); }
LayoutUnit clientTop() const { return borderTop(); }
LayoutUnit clientWidth() const;
LayoutUnit clientHeight() const;
LayoutUnit clientLogicalWidth() const { return style()->isHorizontalWritingMode() ? clientWidth() : clientHeight(); }
LayoutUnit clientLogicalHeight() const { return style()->isHorizontalWritingMode() ? clientHeight() : clientWidth(); }
LayoutUnit clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); }
LayoutRect clientBoxRect() const { return LayoutRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); }
int pixelSnappedClientWidth() const;
int pixelSnappedClientHeight() const;
// scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
// object has overflow:hidden/scroll/auto specified and also has overflow.
// scrollLeft/Top return the current scroll position. These methods are virtual so that objects like
// textareas can scroll shadow content (but pretend that they are the objects that are
// scrolling).
virtual LayoutUnit scrollLeft() const;
virtual LayoutUnit scrollTop() const;
virtual LayoutUnit scrollWidth() const;
virtual LayoutUnit scrollHeight() const;
int pixelSnappedScrollWidth() const;
int pixelSnappedScrollHeight() const;
virtual void setScrollLeft(LayoutUnit);
virtual void setScrollTop(LayoutUnit);
void scrollToOffset(const DoubleSize&);
void scrollByRecursively(const DoubleSize& delta, ScrollOffsetClamping = ScrollOffsetUnclamped);
void scrollRectToVisible(const LayoutRect&, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
virtual LayoutUnit marginTop() const override { return; }
virtual LayoutUnit marginBottom() const override { return m_marginBox.bottom(); }
virtual LayoutUnit marginLeft() const override { return m_marginBox.left(); }
virtual LayoutUnit marginRight() const override { return m_marginBox.right(); }
void setMarginTop(LayoutUnit margin) { m_marginBox.setTop(margin); }
void setMarginBottom(LayoutUnit margin) { m_marginBox.setBottom(margin); }
void setMarginLeft(LayoutUnit margin) { m_marginBox.setLeft(margin); }
void setMarginRight(LayoutUnit margin) { m_marginBox.setRight(margin); }
LayoutUnit marginLogicalLeft() const { return m_marginBox.logicalLeft(style()->writingMode()); }
LayoutUnit marginLogicalRight() const { return m_marginBox.logicalRight(style()->writingMode()); }
virtual LayoutUnit marginBefore(const RenderStyle* overrideStyle = 0) const override final { return m_marginBox.before((overrideStyle ? overrideStyle : style())->writingMode()); }
virtual LayoutUnit marginAfter(const RenderStyle* overrideStyle = 0) const override final { return m_marginBox.after((overrideStyle ? overrideStyle : style())->writingMode()); }
virtual LayoutUnit marginStart(const RenderStyle* overrideStyle = 0) const override final
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style();
return m_marginBox.start(styleToUse->writingMode(), styleToUse->direction());
virtual LayoutUnit marginEnd(const RenderStyle* overrideStyle = 0) const override final
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style();
return m_marginBox.end(styleToUse->writingMode(), styleToUse->direction());
void setMarginBefore(LayoutUnit value, const RenderStyle* overrideStyle = 0) { m_marginBox.setBefore((overrideStyle ? overrideStyle : style())->writingMode(), value); }
void setMarginAfter(LayoutUnit value, const RenderStyle* overrideStyle = 0) { m_marginBox.setAfter((overrideStyle ? overrideStyle : style())->writingMode(), value); }
void setMarginStart(LayoutUnit value, const RenderStyle* overrideStyle = 0)
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style();
m_marginBox.setStart(styleToUse->writingMode(), styleToUse->direction(), value);
void setMarginEnd(LayoutUnit value, const RenderStyle* overrideStyle = 0)
const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style();
m_marginBox.setEnd(styleToUse->writingMode(), styleToUse->direction(), value);
// The following functions are used to implement collapsing margins.
// All objects know their maximal positive and negative margins. The
// formula for computing a collapsed margin is |maxPosMargin| - |maxNegmargin|.
// For a non-collapsing box, such as a leaf element, this formula will simply return
// the margin of the element. Blocks override the maxMarginBefore and maxMarginAfter
// methods.
virtual bool isSelfCollapsingBlock() const { return false; }
virtual LayoutUnit collapsedMarginBefore() const { return marginBefore(); }
virtual LayoutUnit collapsedMarginAfter() const { return marginAfter(); }
virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;
int reflectionOffset() const;
// Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
LayoutRect reflectedRect(const LayoutRect&) const;
virtual void layout() override;
virtual void paint(PaintInfo&, const LayoutPoint&) override;
virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
virtual LayoutUnit minPreferredLogicalWidth() const override;
virtual LayoutUnit maxPreferredLogicalWidth() const override;
// FIXME: We should rename these back to overrideLogicalHeight/Width and have them store
// the border-box height/width like the regular height/width accessors on RenderBox.
// Right now, these are different than contentHeight/contentWidth because they still
// include the scrollbar height/width.
LayoutUnit overrideLogicalContentWidth() const;
LayoutUnit overrideLogicalContentHeight() const;
bool hasOverrideHeight() const;
bool hasOverrideWidth() const;
void setOverrideLogicalContentHeight(LayoutUnit);
void setOverrideLogicalContentWidth(LayoutUnit);
void clearOverrideSize();
void clearOverrideLogicalContentHeight();
void clearOverrideLogicalContentWidth();
LayoutUnit overrideContainingBlockContentLogicalWidth() const;
LayoutUnit overrideContainingBlockContentLogicalHeight() const;
bool hasOverrideContainingBlockLogicalWidth() const;
bool hasOverrideContainingBlockLogicalHeight() const;
void setOverrideContainingBlockContentLogicalWidth(LayoutUnit);
void setOverrideContainingBlockContentLogicalHeight(LayoutUnit);
void clearContainingBlockOverrideSize();
void clearOverrideContainingBlockContentLogicalHeight();
virtual LayoutSize offsetFromContainer(const RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const override;
LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const;
LayoutUnit adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const;
LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const;
LayoutUnit adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const;
struct ComputedMarginValues {
ComputedMarginValues() { }
LayoutUnit m_before;
LayoutUnit m_after;
LayoutUnit m_start;
LayoutUnit m_end;
struct LogicalExtentComputedValues {
LogicalExtentComputedValues() { }
LayoutUnit m_extent;
LayoutUnit m_position;
ComputedMarginValues m_margins;
// Resolve auto margins in the chosen direction of the containing block so that objects can be pushed to the start, middle or end
// of the containing block.
void computeMarginsForDirection(MarginDirection forDirection, const RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd, Length marginStartLength, Length marginStartEnd) const;
// Used to resolve margins in the containing block's block-flow direction.
void computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock);
virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const;
void positionLineBox(InlineBox*);
void moveWithEdgeOfInlineContainerIfNecessary(bool isHorizontal);
virtual InlineBox* createInlineBox();
void dirtyLineBoxes(bool fullLayout);
// For inline replaced elements, this function returns the inline box that owns us. Enables
// the replaced RenderObject to quickly determine what line it is contained on and to easily
// iterate over structures on the line.
InlineBox* inlineBoxWrapper() const { return m_rareData ? m_rareData->m_inlineBoxWrapper : 0; }
void setInlineBoxWrapper(InlineBox*);
void deleteLineBoxWrapper();
virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const override;
virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;
virtual void invalidatePaintForOverhangingFloats(bool paintAllDescendants);
virtual LayoutUnit containingBlockLogicalWidthForContent() const override;
LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
LayoutUnit containingBlockAvailableLineWidth() const;
LayoutUnit perpendicularContainingBlockLogicalHeight() const;
virtual void updateLogicalWidth();
virtual void updateLogicalHeight();
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const;
void computeLogicalWidth(LogicalExtentComputedValues&) const;
bool stretchesToViewport() const
return document().inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isDocumentElement() || isBody()) && !isInline();
virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
virtual LayoutUnit intrinsicContentLogicalHeight() const { return m_intrinsicContentLogicalHeight; }
// Whether or not the element shrinks to its intrinsic width (rather than filling the width
// of a containing block). HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
bool sizesLogicalWidthToFitContent(const Length& logicalWidth) const;
LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb) const;
LayoutUnit computeLogicalWidthUsing(SizeType, const Length& logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* containingBlock) const;
LayoutUnit computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeContentAndScrollbarLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeReplacedLogicalWidthUsing(const Length& width) const;
LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred = ComputeActual) const;
LayoutUnit computeReplacedLogicalHeightUsing(const Length& height) const;
LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const;
virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred = ComputeActual) const;
virtual LayoutUnit computeReplacedLogicalHeight() const;
static bool percentageLogicalHeightIsResolvableFromBlock(const RenderBlock* containingBlock, bool outOfFlowPositioned);
LayoutUnit computePercentageLogicalHeight(const Length& height) const;
// Block flows subclass availableWidth/Height to handle multi column layout (shrinking the width/height available to children when laying out.)
virtual LayoutUnit availableLogicalWidth() const { return contentLogicalWidth(); }
virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const;
LayoutUnit availableLogicalHeightUsing(const Length&, AvailableLogicalHeightType) const;
// There are a few cases where we need to refer specifically to the available physical width and available physical height.
// Relative positioning is one of those cases, since left/top offsets are physical.
LayoutUnit availableWidth() const { return style()->isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); }
LayoutUnit availableHeight() const { return style()->isHorizontalWritingMode() ? availableLogicalHeight(IncludeMarginBorderPadding) : availableLogicalWidth(); }
virtual int verticalScrollbarWidth() const;
int horizontalScrollbarHeight() const;
int instrinsicScrollbarLogicalWidth() const;
int scrollbarLogicalHeight() const { return style()->isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); }
virtual bool scroll(ScrollDirection, ScrollGranularity, float delta = 1);
bool canBeScrolledAndHasScrollableArea() const;
virtual bool canBeProgramaticallyScrolled() const;
virtual void autoscroll(const IntPoint&);
bool canAutoscroll() const;
IntSize calculateAutoscrollDirection(const IntPoint& windowPoint) const;
static RenderBox* findAutoscrollable(RenderObject*);
virtual void stopAutoscroll() { }
virtual void panScroll(const IntPoint&);
bool hasAutoVerticalScrollbar() const { return hasOverflowClip() && (style()->overflowY() == OAUTO || style()->overflowY() == OOVERLAY); }
bool hasAutoHorizontalScrollbar() const { return hasOverflowClip() && (style()->overflowX() == OAUTO || style()->overflowX() == OOVERLAY); }
bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); }
bool hasScrollableOverflowX() const { return scrollsOverflowX() && pixelSnappedScrollWidth() != pixelSnappedClientWidth(); }
bool hasScrollableOverflowY() const { return scrollsOverflowY() && pixelSnappedScrollHeight() != pixelSnappedClientHeight(); }
virtual bool scrollsOverflowX() const { return hasOverflowClip() && (style()->overflowX() == OSCROLL || hasAutoHorizontalScrollbar()); }
virtual bool scrollsOverflowY() const { return hasOverflowClip() && (style()->overflowY() == OSCROLL || hasAutoVerticalScrollbar()); }
bool usesCompositedScrolling() const;
// Elements such as the <input> field override this to specify that they are scrollable
// outside the context of the CSS overflow style
virtual bool isIntristicallyScrollable(ScrollbarOrientation orientation) const { return false; }
bool hasUnsplittableScrollingOverflow() const;
bool isUnsplittableForPagination() const;
virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) override;
virtual LayoutRect overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize);
LayoutRect clipRect(const LayoutPoint& location);
virtual bool hasControlClip() const { return false; }
virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
virtual void paintObject(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); }
virtual void paintBoxDecorationBackground(PaintInfo&, const LayoutPoint&);
virtual void paintMask(PaintInfo&, const LayoutPoint&);
virtual void paintClippingMask(PaintInfo&, const LayoutPoint&);
virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
LayoutRect borderBoxAfterUpdatingLogicalWidth(const LayoutUnit& logicalTop);
// Called when a positioned object moves but doesn't necessarily change size. A simplified layout is attempted
// that just updates the object's position. If the size does change, the object remains dirty.
bool tryLayoutDoingPositionedMovementOnly()
LayoutUnit oldWidth = width();
LayoutUnit newWidth = borderBoxAfterUpdatingLogicalWidth(logicalTop()).width();
// If we shrink to fit our width may have changed, so we still need full layout.
// FIXME: We check for potential change of width when deciding to set needsPositionedMovementLayout.
// So either that check or this one is unnecessary, probably the former.
if (oldWidth != newWidth)
return false;
return true;
virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;
void removeFloatingOrPositionedChildFromBlockLists();
RenderLayer* enclosingFloatPaintingLayer() const;
virtual int firstLineBoxBaseline() const { return -1; }
virtual int inlineBlockBaseline(LineDirectionMode) const { return -1; } // Returns -1 if we should skip this box when computing the baseline of an inline-block.
bool shrinkToAvoidFloats() const;
virtual bool avoidsFloats() const;
virtual void markForPaginationRelayoutIfNeeded(SubtreeLayoutScope&);
bool isWritingModeRoot() const { return !parent() || parent()->style()->writingMode() != style()->writingMode(); }
bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isDeprecatedFlexibleBox(); }
bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); }
virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
virtual LayoutUnit offsetLeft() const override;
virtual LayoutUnit offsetTop() const override;
LayoutPoint flipForWritingModeForChild(const RenderBox* child, const LayoutPoint&) const;
LayoutUnit flipForWritingMode(LayoutUnit position) const WARN_UNUSED_RETURN
// The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return logicalHeight() - position;
LayoutPoint flipForWritingMode(const LayoutPoint& position) const WARN_UNUSED_RETURN
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return isHorizontalWritingMode() ? LayoutPoint(position.x(), height() - position.y()) : LayoutPoint(width() - position.x(), position.y());
LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
LayoutSize flipForWritingMode(const LayoutSize& offset) const WARN_UNUSED_RETURN
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return offset;
return isHorizontalWritingMode() ? LayoutSize(offset.width(), height() - offset.height()) : LayoutSize(width() - offset.width(), offset.height());
void flipForWritingMode(LayoutRect& rect) const
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
rect.setX(width() - rect.maxX());
FloatPoint flipForWritingMode(const FloatPoint& position) const WARN_UNUSED_RETURN
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return isHorizontalWritingMode() ? FloatPoint(position.x(), height() - position.y()) : FloatPoint(width() - position.x(), position.y());
void flipForWritingMode(FloatRect& rect) const
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
rect.setX(width() - rect.maxX());
// These represent your location relative to your container as a physical offset.
// In layout related methods you almost always want the logical location (e.g. x() and y()).
LayoutPoint topLeftLocation() const;
LayoutSize topLeftLocationOffset() const;
LayoutRect logicalVisualOverflowRectForPropagation(RenderStyle*) const;
LayoutRect visualOverflowRectForPropagation(RenderStyle*) const;
LayoutRect logicalLayoutOverflowRectForPropagation(RenderStyle*) const;
LayoutRect layoutOverflowRectForPropagation(RenderStyle*) const;
bool hasRenderOverflow() const { return m_overflow; }
bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); }
virtual bool needsPreferredWidthsRecalculation() const;
virtual void computeIntrinsicRatioInformation(FloatSize& /* intrinsicSize */, double& /* intrinsicRatio */) const { }
IntSize scrolledContentOffset() const;
void applyCachedClipAndScrollOffsetForPaintInvalidation(LayoutRect& paintRect) const;
virtual bool hasRelativeLogicalHeight() const;
bool hasHorizontalLayoutOverflow() const
if (!m_overflow)
return false;
LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect();
LayoutRect noOverflowRect = this->noOverflowRect();
return layoutOverflowRect.x() < noOverflowRect.x() || layoutOverflowRect.maxX() > noOverflowRect.maxX();
bool hasVerticalLayoutOverflow() const
if (!m_overflow)
return false;
LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect();
LayoutRect noOverflowRect = this->noOverflowRect();
return layoutOverflowRect.y() < noOverflowRect.y() || layoutOverflowRect.maxY() > noOverflowRect.maxY();
virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject*) const
return 0;
bool hasSameDirectionAs(const RenderBox* object) const { return style()->direction() == object->style()->direction(); }
ShapeOutsideInfo* shapeOutsideInfo() const
return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : 0;
void markShapeOutsideDependentsForLayout()
if (isFloating())
bool backgroundHasOpaqueTopLayer() const;
virtual void willBeDestroyed() override;
virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
virtual void updateFromStyle() override;
// Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect.
// FIXME: make this a const method once the RenderBox reference in BoxPainter is const.
bool getBackgroundPaintedExtent(LayoutRect&);
virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const;
virtual bool computeBackgroundIsKnownToBeObscured() override;
void computePositionedLogicalWidth(LogicalExtentComputedValues&) const;
LayoutUnit computeIntrinsicLogicalWidthUsing(const Length& logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const;
LayoutUnit computeIntrinsicLogicalContentHeightUsing(const Length& logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const;
virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); }
virtual void mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0, const PaintInvalidationState* = 0) const override;
virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
RenderObject* splitAnonymousBoxesAroundChild(RenderObject* beforeChild);
virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const override;
virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
void updateIntrinsicContentLogicalHeight(LayoutUnit intrinsicContentLogicalHeight) const { m_intrinsicContentLogicalHeight = intrinsicContentLogicalHeight; }
virtual PaintInvalidationReason paintInvalidationReason(const RenderLayerModelObject& paintInvalidationContainer,
const LayoutRect& oldBounds, const LayoutPoint& oldPositionFromPaintInvalidationContainer,
const LayoutRect& newBounds, const LayoutPoint& newPositionFromPaintInvalidationContainer) const override;
virtual void incrementallyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationContainer) override;
virtual void clearPaintInvalidationState(const PaintInvalidationState&) override;
virtual bool paintInvalidationStateIsDirty() const override;
void invalidatePaintRectClippedByOldAndNewBounds(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect&, const LayoutRect& oldBounds, const LayoutRect& newBounds);
void updateShapeOutsideInfoAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle);
void updateGridPositionAfterStyleChange(const RenderStyle*);
bool autoWidthShouldFitContent() const;
void shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues&) const;
// Returns true if we queued up a paint invalidation.
bool paintInvalidationLayerRectsForImage(WrappedImagePtr, const FillLayer&, bool drawingBackground);
bool skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const;
LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
LayoutUnit containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
void computePositionedLogicalHeight(LogicalExtentComputedValues&) const;
void computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
const Length& logicalLeft, const Length& logicalRight, const Length& marginLogicalLeft,
const Length& marginLogicalRight, LogicalExtentComputedValues&) const;
void computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
const Length& logicalTop, const Length& logicalBottom, const Length& marginLogicalTop,
const Length& marginLogicalBottom, LogicalExtentComputedValues&) const;
void computePositionedLogicalHeightReplaced(LogicalExtentComputedValues&) const;
void computePositionedLogicalWidthReplaced(LogicalExtentComputedValues&) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
// This function calculates the minimum and maximum preferred widths for an object.
// These values are used in shrink-to-fit layout systems.
// These include tables, positioned objects, floats and flexible boxes.
virtual void computePreferredLogicalWidths() { clearPreferredLogicalWidthsDirty(); }
RenderBoxRareData& ensureRareData()
if (!m_rareData)
m_rareData = adoptPtr(new RenderBoxRareData());
return *m_rareData.get();
void savePreviousBorderBoxSizeIfNeeded();
LayoutSize computePreviousBorderBoxSize(const LayoutSize& previousBoundsSize) const;
bool logicalHeightComputesAsNone(SizeType) const;
virtual PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& newPaintInvalidationContainer) override final;
bool isBox() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
// The width/height of the contents + borders + padding. The x/y location is relative to our container (which is not always our parent).
LayoutRect m_frameRect;
// Our intrinsic height, used for min-height: min-content etc. Maintained by
// updateLogicalHeight. This is logicalHeight() before it is clamped to
// min/max.
mutable LayoutUnit m_intrinsicContentLogicalHeight;
void inflatePaintInvalidationRectForReflectionAndFilter(LayoutRect&) const;
LayoutBoxExtent m_marginBox;
// The preferred logical width of the element if it were to break its lines at every possible opportunity.
LayoutUnit m_minPreferredLogicalWidth;
// The preferred logical width of the element if it never breaks any lines at all.
LayoutUnit m_maxPreferredLogicalWidth;
// Our overflow information.
OwnPtr<RenderOverflow> m_overflow;
OwnPtr<RenderBoxRareData> m_rareData;
inline RenderBox* RenderBox::previousSiblingBox() const
return toRenderBox(previousSibling());
inline RenderBox* RenderBox::nextSiblingBox() const
return toRenderBox(nextSibling());
inline RenderBox* RenderBox::parentBox() const
return toRenderBox(parent());
inline RenderBox* RenderBox::firstChildBox() const
return toRenderBox(slowFirstChild());
inline RenderBox* RenderBox::lastChildBox() const
return toRenderBox(slowLastChild());
inline void RenderBox::setInlineBoxWrapper(InlineBox* boxWrapper)
if (boxWrapper) {
// m_inlineBoxWrapper should already be 0. Deleting it is a safeguard against security issues.
// Otherwise, there will two line box wrappers keeping the reference to this renderer, and
// only one will be notified when the renderer is getting destroyed. The second line box wrapper
// will keep a stale reference.
if (UNLIKELY(inlineBoxWrapper() != 0))
ensureRareData().m_inlineBoxWrapper = boxWrapper;
} // namespace blink
#endif // RenderBox_h