| /* |
| * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * 2. Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
| * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
| * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
| * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| |
| #include "core/rendering/RenderFlowThread.h" |
| |
| #include "core/dom/Node.h" |
| #include "core/rendering/FlowThreadController.h" |
| #include "core/rendering/HitTestRequest.h" |
| #include "core/rendering/HitTestResult.h" |
| #include "core/rendering/LayoutRectRecorder.h" |
| #include "core/rendering/PaintInfo.h" |
| #include "core/rendering/RenderBoxRegionInfo.h" |
| #include "core/rendering/RenderInline.h" |
| #include "core/rendering/RenderLayer.h" |
| #include "core/rendering/RenderRegion.h" |
| #include "core/rendering/RenderView.h" |
| #include "platform/PODIntervalTree.h" |
| #include "platform/geometry/TransformState.h" |
| |
| namespace WebCore { |
| |
| RenderFlowThread::RenderFlowThread() |
| : RenderBlockFlow(0) |
| , m_previousRegionCount(0) |
| , m_autoLogicalHeightRegionsCount(0) |
| , m_regionsInvalidated(false) |
| , m_regionsHaveUniformLogicalWidth(true) |
| , m_regionsHaveUniformLogicalHeight(true) |
| , m_hasRegionsWithStyling(false) |
| , m_dispatchRegionLayoutUpdateEvent(false) |
| , m_dispatchRegionOversetChangeEvent(false) |
| , m_pageLogicalSizeChanged(false) |
| , m_inConstrainedLayoutPhase(false) |
| , m_needsTwoPhasesLayout(false) |
| { |
| setFlowThreadState(InsideOutOfFlowThread); |
| } |
| |
| PassRefPtr<RenderStyle> RenderFlowThread::createFlowThreadStyle(RenderStyle* parentStyle) |
| { |
| RefPtr<RenderStyle> newStyle(RenderStyle::create()); |
| newStyle->inheritFrom(parentStyle); |
| newStyle->setDisplay(BLOCK); |
| newStyle->setPosition(AbsolutePosition); |
| newStyle->setZIndex(0); |
| newStyle->setLeft(Length(0, Fixed)); |
| newStyle->setTop(Length(0, Fixed)); |
| newStyle->setWidth(Length(100, Percent)); |
| newStyle->setHeight(Length(100, Percent)); |
| newStyle->font().update(0); |
| |
| return newStyle.release(); |
| } |
| |
| void RenderFlowThread::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| RenderBlock::styleDidChange(diff, oldStyle); |
| |
| if (oldStyle && oldStyle->writingMode() != style()->writingMode()) |
| invalidateRegions(); |
| } |
| |
| void RenderFlowThread::removeFlowChildInfo(RenderObject* child) |
| { |
| if (child->isBox()) |
| removeRenderBoxRegionInfo(toRenderBox(child)); |
| clearRenderObjectCustomStyle(child); |
| } |
| |
| void RenderFlowThread::addRegionToThread(RenderRegion* renderRegion) |
| { |
| ASSERT(renderRegion); |
| m_regionList.add(renderRegion); |
| renderRegion->setIsValid(true); |
| } |
| |
| void RenderFlowThread::removeRegionFromThread(RenderRegion* renderRegion) |
| { |
| ASSERT(renderRegion); |
| m_regionList.remove(renderRegion); |
| } |
| |
| void RenderFlowThread::invalidateRegions() |
| { |
| if (m_regionsInvalidated) { |
| ASSERT(selfNeedsLayout()); |
| return; |
| } |
| |
| m_regionRangeMap.clear(); |
| m_breakBeforeToRegionMap.clear(); |
| m_breakAfterToRegionMap.clear(); |
| setNeedsLayout(); |
| |
| m_regionsInvalidated = true; |
| } |
| |
| class CurrentRenderFlowThreadDisabler { |
| WTF_MAKE_NONCOPYABLE(CurrentRenderFlowThreadDisabler); |
| public: |
| CurrentRenderFlowThreadDisabler(RenderView* view) |
| : m_view(view) |
| , m_renderFlowThread(0) |
| { |
| m_renderFlowThread = m_view->flowThreadController()->currentRenderFlowThread(); |
| if (m_renderFlowThread) |
| view->flowThreadController()->setCurrentRenderFlowThread(0); |
| } |
| ~CurrentRenderFlowThreadDisabler() |
| { |
| if (m_renderFlowThread) |
| m_view->flowThreadController()->setCurrentRenderFlowThread(m_renderFlowThread); |
| } |
| private: |
| RenderView* m_view; |
| RenderFlowThread* m_renderFlowThread; |
| }; |
| |
| void RenderFlowThread::validateRegions() |
| { |
| if (m_regionsInvalidated) { |
| m_regionsInvalidated = false; |
| m_regionsHaveUniformLogicalWidth = true; |
| m_regionsHaveUniformLogicalHeight = true; |
| |
| if (hasRegions()) { |
| LayoutUnit previousRegionLogicalWidth = 0; |
| LayoutUnit previousRegionLogicalHeight = 0; |
| bool firstRegionVisited = false; |
| |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| |
| region->deleteAllRenderBoxRegionInfo(); |
| |
| // In the normal layout phase we need to initialize the computedAutoHeight for auto-height regions. |
| // See initializeRegionsComputedAutoHeight for the explanation. |
| // Also, if we have auto-height regions we can't assume m_regionsHaveUniformLogicalHeight to be true in the first phase |
| // because the auto-height regions don't have their height computed yet. |
| if (!inConstrainedLayoutPhase() && region->hasAutoLogicalHeight()) { |
| region->setComputedAutoHeight(region->maxPageLogicalHeight()); |
| m_regionsHaveUniformLogicalHeight = false; |
| } |
| |
| LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| LayoutUnit regionLogicalHeight = region->pageLogicalHeight(); |
| |
| if (!firstRegionVisited) { |
| firstRegionVisited = true; |
| } else { |
| if (m_regionsHaveUniformLogicalWidth && previousRegionLogicalWidth != regionLogicalWidth) |
| m_regionsHaveUniformLogicalWidth = false; |
| if (m_regionsHaveUniformLogicalHeight && previousRegionLogicalHeight != regionLogicalHeight) |
| m_regionsHaveUniformLogicalHeight = false; |
| } |
| |
| previousRegionLogicalWidth = regionLogicalWidth; |
| } |
| } |
| } |
| |
| updateLogicalWidth(); // Called to get the maximum logical width for the region. |
| updateRegionsFlowThreadPortionRect(); |
| } |
| |
| void RenderFlowThread::layout() |
| { |
| LayoutRectRecorder recorder(*this); |
| m_pageLogicalSizeChanged = m_regionsInvalidated && everHadLayout(); |
| |
| // In case this is the second pass of the normal phase we need to update the auto-height regions to their initial value. |
| // If the region chain was invalidated this will happen anyway. |
| if (!m_regionsInvalidated && !inConstrainedLayoutPhase()) |
| initializeRegionsComputedAutoHeight(); |
| |
| validateRegions(); |
| |
| // This is the first phase of the layout and because we have auto-height regions we'll need a second |
| // pass to update the flow with the computed auto-height regions. |
| m_needsTwoPhasesLayout = !inConstrainedLayoutPhase() && hasAutoLogicalHeightRegions(); |
| |
| CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this); |
| RenderBlockFlow::layout(); |
| |
| m_pageLogicalSizeChanged = false; |
| |
| if (lastRegion()) |
| lastRegion()->expandToEncompassFlowThreadContentsIfNeeded(); |
| |
| if (shouldDispatchRegionLayoutUpdateEvent()) |
| dispatchRegionLayoutUpdateEvent(); |
| |
| if (shouldDispatchRegionOversetChangeEvent()) |
| dispatchRegionOversetChangeEvent(); |
| } |
| |
| void RenderFlowThread::updateLogicalWidth() |
| { |
| LayoutUnit logicalWidth = initialLogicalWidth(); |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| logicalWidth = max(region->pageLogicalWidth(), logicalWidth); |
| } |
| setLogicalWidth(logicalWidth); |
| |
| // If the regions have non-uniform logical widths, then insert inset information for the RenderFlowThread. |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| if (regionLogicalWidth != logicalWidth) { |
| LayoutUnit logicalLeft = style()->direction() == LTR ? LayoutUnit() : logicalWidth - regionLogicalWidth; |
| region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth, false); |
| } |
| } |
| } |
| |
| void RenderFlowThread::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const |
| { |
| computedValues.m_position = logicalTop; |
| computedValues.m_extent = 0; |
| |
| for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| |
| computedValues.m_extent += region->logicalHeightOfAllFlowThreadContent(); |
| } |
| } |
| |
| LayoutRect RenderFlowThread::computeRegionClippingRect(const LayoutPoint& offset, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect) const |
| { |
| LayoutRect regionClippingRect(offset + (flowThreadPortionOverflowRect.location() - flowThreadPortionRect.location()), flowThreadPortionOverflowRect.size()); |
| if (style()->isFlippedBlocksWritingMode()) |
| regionClippingRect.move(flowThreadPortionRect.size() - flowThreadPortionOverflowRect.size()); |
| return regionClippingRect; |
| } |
| |
| void RenderFlowThread::paintFlowThreadPortionInRegion(PaintInfo& paintInfo, RenderRegion* region, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect, const LayoutPoint& paintOffset) const |
| { |
| GraphicsContext* context = paintInfo.context; |
| if (!context) |
| return; |
| |
| // RenderFlowThread should start painting its content in a position that is offset |
| // from the region rect's current position. The amount of offset is equal to the location of |
| // the flow thread portion in the flow thread's local coordinates. |
| // Note that we have to pixel snap the location at which we're going to paint, since this is necessary |
| // to minimize the amount of incorrect snapping that would otherwise occur. |
| // If we tried to paint by applying a non-integral translation, then all the |
| // layout code that attempted to pixel snap would be incorrect. |
| IntPoint adjustedPaintOffset; |
| LayoutPoint portionLocation; |
| if (style()->isFlippedBlocksWritingMode()) { |
| LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); |
| flipForWritingMode(flippedFlowThreadPortionRect); |
| portionLocation = flippedFlowThreadPortionRect.location(); |
| } else { |
| portionLocation = flowThreadPortionRect.location(); |
| } |
| adjustedPaintOffset = roundedIntPoint(paintOffset - portionLocation); |
| |
| // The clipping rect for the region is set up by assuming the flowThreadPortionRect is going to paint offset from adjustedPaintOffset. |
| // Remember that we pixel snapped and moved the paintOffset and stored the snapped result in adjustedPaintOffset. Now we add back in |
| // the flowThreadPortionRect's location to get the spot where we expect the portion to actually paint. This can be non-integral and |
| // that's ok. We then pixel snap the resulting clipping rect to account for snapping that will occur when the flow thread paints. |
| IntRect regionClippingRect = pixelSnappedIntRect(computeRegionClippingRect(adjustedPaintOffset + portionLocation, flowThreadPortionRect, flowThreadPortionOverflowRect)); |
| |
| PaintInfo info(paintInfo); |
| info.rect.intersect(regionClippingRect); |
| |
| if (!info.rect.isEmpty()) { |
| context->save(); |
| |
| context->clip(regionClippingRect); |
| |
| context->translate(adjustedPaintOffset.x(), adjustedPaintOffset.y()); |
| info.rect.moveBy(-adjustedPaintOffset); |
| |
| if (info.phase == PaintPhaseTextClip) |
| info.paintBehavior = PaintBehaviorForceBlackText; |
| |
| layer()->paint(context, info.rect, info.paintBehavior, 0, region, PaintLayerTemporaryClipRects); |
| |
| context->restore(); |
| } |
| } |
| |
| bool RenderFlowThread::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) |
| { |
| if (hitTestAction == HitTestBlockBackground) |
| return false; |
| return RenderBlock::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction); |
| } |
| |
| bool RenderFlowThread::hitTestFlowThreadPortionInRegion(RenderRegion* region, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) const |
| { |
| LayoutRect regionClippingRect = computeRegionClippingRect(accumulatedOffset, flowThreadPortionRect, flowThreadPortionOverflowRect); |
| if (!regionClippingRect.contains(locationInContainer.point())) |
| return false; |
| |
| LayoutSize renderFlowThreadOffset; |
| if (style()->isFlippedBlocksWritingMode()) { |
| LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); |
| flipForWritingMode(flippedFlowThreadPortionRect); |
| renderFlowThreadOffset = accumulatedOffset - flippedFlowThreadPortionRect.location(); |
| } else { |
| renderFlowThreadOffset = accumulatedOffset - flowThreadPortionRect.location(); |
| } |
| |
| // Always ignore clipping, since the RenderFlowThread has nothing to do with the bounds of the FrameView. |
| HitTestRequest newRequest(request.type() | HitTestRequest::IgnoreClipping | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent); |
| |
| // Make a new temporary HitTestLocation in the new region. |
| HitTestLocation newHitTestLocation(locationInContainer, -renderFlowThreadOffset, region); |
| |
| bool isPointInsideFlowThread = layer()->hitTest(newRequest, newHitTestLocation, result); |
| |
| // FIXME: Should we set result.m_localPoint back to the RenderRegion's coordinate space or leave it in the RenderFlowThread's coordinate |
| // space? Right now it's staying in the RenderFlowThread's coordinate space, which may end up being ok. We will know more when we get around to |
| // patching positionForPoint. |
| return isPointInsideFlowThread; |
| } |
| |
| bool RenderFlowThread::shouldRepaint(const LayoutRect& r) const |
| { |
| if (view()->document().printing() || r.isEmpty()) |
| return false; |
| |
| return true; |
| } |
| |
| void RenderFlowThread::repaintRectangleInRegions(const LayoutRect& repaintRect) const |
| { |
| if (!shouldRepaint(repaintRect) || !hasValidRegionInfo()) |
| return; |
| |
| LayoutStateDisabler layoutStateDisabler(view()); // We can't use layout state to repaint, since the regions are somewhere else. |
| |
| // We can't use currentFlowThread as it is possible to have interleaved flow threads and the wrong one could be used. |
| // Let each region figure out the proper enclosing flow thread. |
| CurrentRenderFlowThreadDisabler disabler(view()); |
| |
| for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| |
| region->repaintFlowThreadContent(repaintRect); |
| } |
| } |
| |
| RenderRegion* RenderFlowThread::regionAtBlockOffset(LayoutUnit offset, bool extendLastRegion, RegionAutoGenerationPolicy autoGenerationPolicy) |
| { |
| ASSERT(!m_regionsInvalidated); |
| |
| if (autoGenerationPolicy == AllowRegionAutoGeneration) |
| autoGenerateRegionsToBlockOffset(offset); |
| |
| if (offset <= 0) |
| return m_regionList.isEmpty() ? 0 : m_regionList.first(); |
| |
| RegionSearchAdapter adapter(offset); |
| m_regionIntervalTree.allOverlapsWithAdapter<RegionSearchAdapter>(adapter); |
| |
| // If no region was found, the offset is in the flow thread overflow. |
| // The last region will contain the offset if extendLastRegion is set or if the last region is a set. |
| if (!adapter.result() && !m_regionList.isEmpty() && (extendLastRegion || m_regionList.last()->isRenderRegionSet())) |
| return m_regionList.last(); |
| |
| return adapter.result(); |
| } |
| |
| LayoutPoint RenderFlowThread::adjustedPositionRelativeToOffsetParent(const RenderBoxModelObject& boxModelObject, const LayoutPoint& startPoint) |
| { |
| LayoutPoint referencePoint = startPoint; |
| |
| // FIXME: This needs to be adapted for different writing modes inside the flow thread. |
| RenderRegion* startRegion = regionAtBlockOffset(referencePoint.y()); |
| if (startRegion) { |
| RenderBoxModelObject* startRegionBox = startRegion->isRenderNamedFlowFragment() ? toRenderBoxModelObject(startRegion->parent()) : startRegion; |
| // Take into account the offset coordinates of the region. |
| RenderObject* currObject = startRegionBox; |
| RenderObject* currOffsetParentRenderer; |
| Element* currOffsetParentElement; |
| while ((currOffsetParentElement = currObject->offsetParent()) && (currOffsetParentRenderer = currOffsetParentElement->renderer())) { |
| if (currObject->isBoxModelObject()) |
| referencePoint.move(toRenderBoxModelObject(currObject)->offsetLeft(), toRenderBoxModelObject(currObject)->offsetTop()); |
| |
| // Since we're looking for the offset relative to the body, we must also |
| // take into consideration the borders of the region's offsetParent. |
| if (currOffsetParentRenderer->isBox() && !currOffsetParentRenderer->isBody()) |
| referencePoint.move(toRenderBox(currOffsetParentRenderer)->borderLeft(), toRenderBox(currOffsetParentRenderer)->borderTop()); |
| |
| currObject = currOffsetParentRenderer; |
| } |
| |
| // We need to check if any of this box's containing blocks start in a different region |
| // and if so, drop the object's top position (which was computed relative to its containing block |
| // and is no longer valid) and recompute it using the region in which it flows as reference. |
| bool wasComputedRelativeToOtherRegion = false; |
| const RenderBlock* objContainingBlock = boxModelObject.containingBlock(); |
| while (objContainingBlock && !objContainingBlock->isRenderNamedFlowThread()) { |
| // Check if this object is in a different region. |
| RenderRegion* parentStartRegion = 0; |
| RenderRegion* parentEndRegion = 0; |
| getRegionRangeForBox(objContainingBlock, parentStartRegion, parentEndRegion); |
| if (parentStartRegion && parentStartRegion != startRegion) { |
| wasComputedRelativeToOtherRegion = true; |
| break; |
| } |
| objContainingBlock = objContainingBlock->containingBlock(); |
| } |
| |
| if (wasComputedRelativeToOtherRegion) { |
| if (boxModelObject.isBox()) { |
| // Use borderBoxRectInRegion to account for variations such as percentage margins. |
| LayoutRect borderBoxRect = toRenderBox(&boxModelObject)->borderBoxRectInRegion(startRegion, RenderBox::DoNotCacheRenderBoxRegionInfo); |
| referencePoint.move(borderBoxRect.location().x(), 0); |
| } |
| |
| // Get the logical top coordinate of the current object. |
| LayoutUnit top = 0; |
| if (boxModelObject.isRenderBlock()) { |
| top = toRenderBlock(&boxModelObject)->offsetFromLogicalTopOfFirstPage(); |
| } else { |
| if (boxModelObject.containingBlock()) |
| top = boxModelObject.containingBlock()->offsetFromLogicalTopOfFirstPage(); |
| |
| if (boxModelObject.isBox()) |
| top += toRenderBox(&boxModelObject)->topLeftLocation().y(); |
| else if (boxModelObject.isRenderInline()) |
| top -= toRenderInline(&boxModelObject)->borderTop(); |
| } |
| |
| // Get the logical top of the region this object starts in |
| // and compute the object's top, relative to the region's top. |
| LayoutUnit regionLogicalTop = startRegion->pageLogicalTopForOffset(top); |
| LayoutUnit topRelativeToRegion = top - regionLogicalTop; |
| referencePoint.setY(startRegionBox->offsetTop() + topRelativeToRegion); |
| |
| // Since the top has been overriden, check if the |
| // relative/sticky positioning must be reconsidered. |
| if (boxModelObject.isRelPositioned()) |
| referencePoint.move(0, boxModelObject.relativePositionOffset().height()); |
| else if (boxModelObject.isStickyPositioned()) |
| referencePoint.move(0, boxModelObject.stickyPositionOffset().height()); |
| } |
| |
| // Since we're looking for the offset relative to the body, we must also |
| // take into consideration the borders of the region. |
| referencePoint.move(startRegionBox->borderLeft(), startRegionBox->borderTop()); |
| } |
| |
| return referencePoint; |
| } |
| |
| LayoutUnit RenderFlowThread::pageLogicalTopForOffset(LayoutUnit offset) |
| { |
| RenderRegion* region = regionAtBlockOffset(offset); |
| return region ? region->pageLogicalTopForOffset(offset) : LayoutUnit(); |
| } |
| |
| LayoutUnit RenderFlowThread::pageLogicalWidthForOffset(LayoutUnit offset) |
| { |
| RenderRegion* region = regionAtBlockOffset(offset, true); |
| return region ? region->pageLogicalWidth() : contentLogicalWidth(); |
| } |
| |
| LayoutUnit RenderFlowThread::pageLogicalHeightForOffset(LayoutUnit offset) |
| { |
| RenderRegion* region = regionAtBlockOffset(offset); |
| if (!region) |
| return 0; |
| |
| return region->pageLogicalHeight(); |
| } |
| |
| LayoutUnit RenderFlowThread::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule) |
| { |
| RenderRegion* region = regionAtBlockOffset(offset); |
| if (!region) |
| return 0; |
| |
| LayoutUnit pageLogicalTop = region->pageLogicalTopForOffset(offset); |
| LayoutUnit pageLogicalHeight = region->pageLogicalHeight(); |
| LayoutUnit pageLogicalBottom = pageLogicalTop + pageLogicalHeight; |
| LayoutUnit remainingHeight = pageLogicalBottom - offset; |
| if (pageBoundaryRule == IncludePageBoundary) { |
| // If IncludePageBoundary is set, the line exactly on the top edge of a |
| // region will act as being part of the previous region. |
| remainingHeight = intMod(remainingHeight, pageLogicalHeight); |
| } |
| return remainingHeight; |
| } |
| |
| RenderRegion* RenderFlowThread::mapFromFlowToRegion(TransformState& transformState) const |
| { |
| if (!hasValidRegionInfo()) |
| return 0; |
| |
| LayoutRect boxRect = transformState.mappedQuad().enclosingBoundingBox(); |
| flipForWritingMode(boxRect); |
| |
| // FIXME: We need to refactor RenderObject::absoluteQuads to be able to split the quads across regions, |
| // for now we just take the center of the mapped enclosing box and map it to a region. |
| // Note: Using the center in order to avoid rounding errors. |
| |
| LayoutPoint center = boxRect.center(); |
| RenderRegion* renderRegion = const_cast<RenderFlowThread*>(this)->regionAtBlockOffset(isHorizontalWritingMode() ? center.y() : center.x(), true, DisallowRegionAutoGeneration); |
| if (!renderRegion) |
| return 0; |
| |
| LayoutRect flippedRegionRect(renderRegion->flowThreadPortionRect()); |
| flipForWritingMode(flippedRegionRect); |
| |
| transformState.move(renderRegion->contentBoxRect().location() - flippedRegionRect.location()); |
| |
| return renderRegion; |
| } |
| |
| void RenderFlowThread::removeRenderBoxRegionInfo(RenderBox* box) |
| { |
| if (!hasRegions()) |
| return; |
| |
| // If the region chain was invalidated the next layout will clear the box information from all the regions. |
| if (m_regionsInvalidated) { |
| ASSERT(selfNeedsLayout()); |
| return; |
| } |
| |
| RenderRegion* startRegion; |
| RenderRegion* endRegion; |
| getRegionRangeForBox(box, startRegion, endRegion); |
| |
| for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| region->removeRenderBoxRegionInfo(box); |
| if (region == endRegion) |
| break; |
| } |
| |
| #ifndef NDEBUG |
| // We have to make sure we did not leave any RenderBoxRegionInfo attached. |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| ASSERT(!region->renderBoxRegionInfo(box)); |
| } |
| #endif |
| |
| m_regionRangeMap.remove(box); |
| } |
| |
| bool RenderFlowThread::logicalWidthChangedInRegionsForBlock(const RenderBlock* block) |
| { |
| if (!hasRegions()) |
| return false; |
| |
| RenderRegion* startRegion; |
| RenderRegion* endRegion; |
| getRegionRangeForBox(block, startRegion, endRegion); |
| |
| // When the region chain is invalidated the box information is discarded so we must assume the width has changed. |
| if (m_pageLogicalSizeChanged && !startRegion) |
| return true; |
| |
| // Not necessary for the flow thread, since we already computed the correct info for it. |
| if (block == this) |
| return false; |
| |
| for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| |
| OwnPtr<RenderBoxRegionInfo> oldInfo = region->takeRenderBoxRegionInfo(block); |
| if (!oldInfo) |
| continue; |
| |
| LayoutUnit oldLogicalWidth = oldInfo->logicalWidth(); |
| RenderBoxRegionInfo* newInfo = block->renderBoxRegionInfo(region); |
| if (!newInfo || newInfo->logicalWidth() != oldLogicalWidth) |
| return true; |
| |
| if (region == endRegion) |
| break; |
| } |
| |
| return false; |
| } |
| |
| LayoutUnit RenderFlowThread::contentLogicalWidthOfFirstRegion() const |
| { |
| RenderRegion* firstValidRegionInFlow = firstRegion(); |
| if (!firstValidRegionInFlow) |
| return 0; |
| return isHorizontalWritingMode() ? firstValidRegionInFlow->contentWidth() : firstValidRegionInFlow->contentHeight(); |
| } |
| |
| LayoutUnit RenderFlowThread::contentLogicalHeightOfFirstRegion() const |
| { |
| RenderRegion* firstValidRegionInFlow = firstRegion(); |
| if (!firstValidRegionInFlow) |
| return 0; |
| return isHorizontalWritingMode() ? firstValidRegionInFlow->contentHeight() : firstValidRegionInFlow->contentWidth(); |
| } |
| |
| LayoutUnit RenderFlowThread::contentLogicalLeftOfFirstRegion() const |
| { |
| RenderRegion* firstValidRegionInFlow = firstRegion(); |
| if (!firstValidRegionInFlow) |
| return 0; |
| return isHorizontalWritingMode() ? firstValidRegionInFlow->flowThreadPortionRect().x() : firstValidRegionInFlow->flowThreadPortionRect().y(); |
| } |
| |
| RenderRegion* RenderFlowThread::firstRegion() const |
| { |
| if (!hasValidRegionInfo()) |
| return 0; |
| return m_regionList.first(); |
| } |
| |
| RenderRegion* RenderFlowThread::lastRegion() const |
| { |
| if (!hasValidRegionInfo()) |
| return 0; |
| return m_regionList.last(); |
| } |
| |
| void RenderFlowThread::clearRenderObjectCustomStyle(const RenderObject* object, |
| const RenderRegion* oldStartRegion, const RenderRegion* oldEndRegion, |
| const RenderRegion* newStartRegion, const RenderRegion* newEndRegion) |
| { |
| // Clear the styles for the object in the regions. |
| // The styles are not cleared for the regions that are contained in both ranges. |
| bool insideOldRegionRange = false; |
| bool insideNewRegionRange = false; |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| |
| if (oldStartRegion == region) |
| insideOldRegionRange = true; |
| if (newStartRegion == region) |
| insideNewRegionRange = true; |
| |
| if (!(insideOldRegionRange && insideNewRegionRange)) |
| region->clearObjectStyleInRegion(object); |
| |
| if (oldEndRegion == region) |
| insideOldRegionRange = false; |
| if (newEndRegion == region) |
| insideNewRegionRange = false; |
| } |
| } |
| |
| void RenderFlowThread::setRegionRangeForBox(const RenderBox* box, LayoutUnit offsetFromLogicalTopOfFirstPage) |
| { |
| if (!hasRegions()) |
| return; |
| |
| // FIXME: Not right for differing writing-modes. |
| RenderRegion* startRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstPage, true); |
| RenderRegion* endRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstPage + box->logicalHeight(), true); |
| RenderRegionRangeMap::iterator it = m_regionRangeMap.find(box); |
| if (it == m_regionRangeMap.end()) { |
| m_regionRangeMap.set(box, RenderRegionRange(startRegion, endRegion)); |
| clearRenderObjectCustomStyle(box); |
| return; |
| } |
| |
| // If nothing changed, just bail. |
| RenderRegionRange& range = it->value; |
| if (range.startRegion() == startRegion && range.endRegion() == endRegion) |
| return; |
| |
| // Delete any info that we find before our new startRegion and after our new endRegion. |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| if (region == startRegion) { |
| iter = m_regionList.find(endRegion); |
| continue; |
| } |
| |
| region->removeRenderBoxRegionInfo(box); |
| |
| if (region == range.endRegion()) |
| break; |
| } |
| |
| clearRenderObjectCustomStyle(box, range.startRegion(), range.endRegion(), startRegion, endRegion); |
| range.setRange(startRegion, endRegion); |
| } |
| |
| void RenderFlowThread::getRegionRangeForBox(const RenderBox* box, RenderRegion*& startRegion, RenderRegion*& endRegion) const |
| { |
| startRegion = 0; |
| endRegion = 0; |
| RenderRegionRangeMap::const_iterator it = m_regionRangeMap.find(box); |
| if (it == m_regionRangeMap.end()) |
| return; |
| |
| const RenderRegionRange& range = it->value; |
| startRegion = range.startRegion(); |
| endRegion = range.endRegion(); |
| ASSERT(m_regionList.contains(startRegion) && m_regionList.contains(endRegion)); |
| } |
| |
| void RenderFlowThread::applyBreakAfterContent(LayoutUnit clientHeight) |
| { |
| // Simulate a region break at height. If it points inside an auto logical height region, |
| // then it may determine the region computed autoheight. |
| addForcedRegionBreak(clientHeight, this, false); |
| } |
| |
| bool RenderFlowThread::regionInRange(const RenderRegion* targetRegion, const RenderRegion* startRegion, const RenderRegion* endRegion) const |
| { |
| ASSERT(targetRegion); |
| |
| for (RenderRegionList::const_iterator it = m_regionList.find(const_cast<RenderRegion*>(startRegion)); it != m_regionList.end(); ++it) { |
| const RenderRegion* currRegion = *it; |
| if (targetRegion == currRegion) |
| return true; |
| if (currRegion == endRegion) |
| break; |
| } |
| |
| return false; |
| } |
| |
| // Check if the content is flown into at least a region with region styling rules. |
| void RenderFlowThread::checkRegionsWithStyling() |
| { |
| bool hasRegionsWithStyling = false; |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| if (region->hasCustomRegionStyle()) { |
| hasRegionsWithStyling = true; |
| break; |
| } |
| } |
| m_hasRegionsWithStyling = hasRegionsWithStyling; |
| } |
| |
| bool RenderFlowThread::objectInFlowRegion(const RenderObject* object, const RenderRegion* region) const |
| { |
| ASSERT(object); |
| ASSERT(region); |
| |
| RenderFlowThread* flowThread = object->flowThreadContainingBlock(); |
| if (flowThread != this) |
| return false; |
| if (!m_regionList.contains(const_cast<RenderRegion*>(region))) |
| return false; |
| |
| RenderBox* enclosingBox = object->enclosingBox(); |
| RenderRegion* enclosingBoxStartRegion = 0; |
| RenderRegion* enclosingBoxEndRegion = 0; |
| getRegionRangeForBox(enclosingBox, enclosingBoxStartRegion, enclosingBoxEndRegion); |
| if (!regionInRange(region, enclosingBoxStartRegion, enclosingBoxEndRegion)) |
| return false; |
| |
| if (object->isBox()) |
| return true; |
| |
| LayoutRect objectABBRect = object->absoluteBoundingBoxRect(true); |
| if (!objectABBRect.width()) |
| objectABBRect.setWidth(1); |
| if (!objectABBRect.height()) |
| objectABBRect.setHeight(1); |
| if (objectABBRect.intersects(region->absoluteBoundingBoxRect(true))) |
| return true; |
| |
| if (region == lastRegion()) { |
| // If the object does not intersect any of the enclosing box regions |
| // then the object is in last region. |
| for (RenderRegionList::const_iterator it = m_regionList.find(enclosingBoxStartRegion); it != m_regionList.end(); ++it) { |
| const RenderRegion* currRegion = *it; |
| if (currRegion == region) |
| break; |
| if (objectABBRect.intersects(currRegion->absoluteBoundingBoxRect(true))) |
| return false; |
| } |
| return true; |
| } |
| |
| return false; |
| } |
| |
| #ifndef NDEBUG |
| bool RenderFlowThread::isAutoLogicalHeightRegionsCountConsistent() const |
| { |
| unsigned autoLogicalHeightRegions = 0; |
| for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| const RenderRegion* region = *iter; |
| if (region->hasAutoLogicalHeight()) |
| autoLogicalHeightRegions++; |
| } |
| |
| return autoLogicalHeightRegions == m_autoLogicalHeightRegionsCount; |
| } |
| #endif |
| |
| // During the normal layout phase of the named flow the regions are initialized with a height equal to their max-height. |
| // This way unforced breaks are automatically placed when a region is full and the content height/position correctly estimated. |
| // Also, the region where a forced break falls is exactly the region found at the forced break offset inside the flow content. |
| void RenderFlowThread::initializeRegionsComputedAutoHeight(RenderRegion* startRegion) |
| { |
| ASSERT(!inConstrainedLayoutPhase()); |
| if (!hasAutoLogicalHeightRegions()) |
| return; |
| |
| RenderRegionList::iterator regionIter = startRegion ? m_regionList.find(startRegion) : m_regionList.begin(); |
| for (; regionIter != m_regionList.end(); ++regionIter) { |
| RenderRegion* region = *regionIter; |
| if (region->hasAutoLogicalHeight()) |
| region->setComputedAutoHeight(region->maxPageLogicalHeight()); |
| } |
| } |
| |
| void RenderFlowThread::markAutoLogicalHeightRegionsForLayout() |
| { |
| ASSERT(hasAutoLogicalHeightRegions()); |
| |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| if (!region->hasAutoLogicalHeight()) |
| continue; |
| |
| // FIXME: We need to find a way to avoid marking all the regions ancestors for layout |
| // as we are already inside layout. |
| region->setNeedsLayout(); |
| } |
| } |
| |
| void RenderFlowThread::updateRegionsFlowThreadPortionRect(const RenderRegion* lastRegionWithContent) |
| { |
| ASSERT(!lastRegionWithContent || (!inConstrainedLayoutPhase() && hasAutoLogicalHeightRegions())); |
| LayoutUnit logicalHeight = 0; |
| bool emptyRegionsSegment = false; |
| // FIXME: Optimize not to clear the interval all the time. This implies manually managing the tree nodes lifecycle. |
| m_regionIntervalTree.clear(); |
| m_regionIntervalTree.initIfNeeded(); |
| for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| |
| // If we find an empty auto-height region, clear the computedAutoHeight value. |
| if (emptyRegionsSegment && region->hasAutoLogicalHeight()) |
| region->clearComputedAutoHeight(); |
| |
| LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| LayoutUnit regionLogicalHeight = std::min<LayoutUnit>(RenderFlowThread::maxLogicalHeight() - logicalHeight, region->logicalHeightOfAllFlowThreadContent()); |
| |
| LayoutRect regionRect(style()->direction() == LTR ? LayoutUnit() : logicalWidth() - regionLogicalWidth, logicalHeight, regionLogicalWidth, regionLogicalHeight); |
| |
| region->setFlowThreadPortionRect(isHorizontalWritingMode() ? regionRect : regionRect.transposedRect()); |
| |
| m_regionIntervalTree.add(RegionIntervalTree::createInterval(logicalHeight, logicalHeight + regionLogicalHeight, region)); |
| |
| logicalHeight += regionLogicalHeight; |
| |
| // Once we find the last region with content the next regions are considered empty. |
| if (lastRegionWithContent == region) |
| emptyRegionsSegment = true; |
| } |
| |
| ASSERT(!lastRegionWithContent || emptyRegionsSegment); |
| } |
| |
| // Even if we require the break to occur at offsetBreakInFlowThread, because regions may have min/max-height values, |
| // it is possible that the break will occur at a different offset than the original one required. |
| // offsetBreakAdjustment measures the different between the requested break offset and the current break offset. |
| bool RenderFlowThread::addForcedRegionBreak(LayoutUnit offsetBreakInFlowThread, RenderObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment) |
| { |
| // We take breaks into account for height computation for auto logical height regions |
| // only in the layout phase in which we lay out the flows threads unconstrained |
| // and we use the content breaks to determine the computedAutoHeight for |
| // auto logical height regions. |
| if (inConstrainedLayoutPhase()) |
| return false; |
| |
| // Breaks can come before or after some objects. We need to track these objects, so that if we get |
| // multiple breaks for the same object (for example because of multiple layouts on the same object), |
| // we need to invalidate every other region after the old one and start computing from fresh. |
| RenderObjectToRegionMap& mapToUse = isBefore ? m_breakBeforeToRegionMap : m_breakAfterToRegionMap; |
| RenderObjectToRegionMap::iterator iter = mapToUse.find(breakChild); |
| if (iter != mapToUse.end()) { |
| RenderRegionList::iterator regionIter = m_regionList.find(iter->value); |
| ASSERT_WITH_SECURITY_IMPLICATION(regionIter != m_regionList.end()); |
| ASSERT((*regionIter)->hasAutoLogicalHeight()); |
| initializeRegionsComputedAutoHeight(*regionIter); |
| |
| // We need to update the regions flow thread portion rect because we are going to process |
| // a break on these regions. |
| updateRegionsFlowThreadPortionRect(); |
| } |
| |
| // Simulate a region break at offsetBreakInFlowThread. If it points inside an auto logical height region, |
| // then it determines the region computed auto height. |
| RenderRegion* region = regionAtBlockOffset(offsetBreakInFlowThread); |
| if (!region) |
| return false; |
| |
| bool lastBreakAfterContent = breakChild == this; |
| bool hasComputedAutoHeight = false; |
| |
| LayoutUnit currentRegionOffsetInFlowThread = isHorizontalWritingMode() ? region->flowThreadPortionRect().y() : region->flowThreadPortionRect().x(); |
| LayoutUnit offsetBreakInCurrentRegion = offsetBreakInFlowThread - currentRegionOffsetInFlowThread; |
| |
| if (region->hasAutoLogicalHeight()) { |
| // A forced break can appear only in an auto-height region that didn't have a forced break before. |
| // This ASSERT is a good-enough heuristic to verify the above condition. |
| ASSERT(region->maxPageLogicalHeight() == region->computedAutoHeight()); |
| |
| mapToUse.set(breakChild, region); |
| |
| hasComputedAutoHeight = true; |
| |
| // Compute the region height pretending that the offsetBreakInCurrentRegion is the logicalHeight for the auto-height region. |
| LayoutUnit regionComputedAutoHeight = region->constrainContentBoxLogicalHeightByMinMax(offsetBreakInCurrentRegion, -1); |
| |
| // The new height of this region needs to be smaller than the initial value, the max height. A forced break is the only way to change the initial |
| // height of an auto-height region besides content ending. |
| ASSERT(regionComputedAutoHeight <= region->maxPageLogicalHeight()); |
| |
| region->setComputedAutoHeight(regionComputedAutoHeight); |
| |
| currentRegionOffsetInFlowThread += regionComputedAutoHeight; |
| } else { |
| currentRegionOffsetInFlowThread += isHorizontalWritingMode() ? region->flowThreadPortionRect().height() : region->flowThreadPortionRect().width(); |
| } |
| |
| // If the break was found inside an auto-height region its size changed so we need to recompute the flow thread portion rectangles. |
| // Also, if this is the last break after the content we need to clear the computedAutoHeight value on the last empty regions. |
| if (hasAutoLogicalHeightRegions() && lastBreakAfterContent) |
| updateRegionsFlowThreadPortionRect(region); |
| else if (hasComputedAutoHeight) |
| updateRegionsFlowThreadPortionRect(); |
| |
| if (offsetBreakAdjustment) |
| *offsetBreakAdjustment = max<LayoutUnit>(0, currentRegionOffsetInFlowThread - offsetBreakInFlowThread); |
| |
| return hasComputedAutoHeight; |
| } |
| |
| void RenderFlowThread::incrementAutoLogicalHeightRegions() |
| { |
| if (!m_autoLogicalHeightRegionsCount) |
| view()->flowThreadController()->incrementFlowThreadsWithAutoLogicalHeightRegions(); |
| ++m_autoLogicalHeightRegionsCount; |
| } |
| |
| void RenderFlowThread::decrementAutoLogicalHeightRegions() |
| { |
| ASSERT(m_autoLogicalHeightRegionsCount > 0); |
| --m_autoLogicalHeightRegionsCount; |
| if (!m_autoLogicalHeightRegionsCount) |
| view()->flowThreadController()->decrementFlowThreadsWithAutoLogicalHeightRegions(); |
| } |
| |
| void RenderFlowThread::collectLayerFragments(LayerFragments& layerFragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) |
| { |
| ASSERT(!m_regionsInvalidated); |
| |
| for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| region->collectLayerFragments(layerFragments, layerBoundingBox, dirtyRect); |
| } |
| } |
| |
| LayoutRect RenderFlowThread::fragmentsBoundingBox(const LayoutRect& layerBoundingBox) |
| { |
| ASSERT(!m_regionsInvalidated); |
| |
| LayoutRect result; |
| for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| RenderRegion* region = *iter; |
| LayerFragments fragments; |
| region->collectLayerFragments(fragments, layerBoundingBox, PaintInfo::infiniteRect()); |
| for (size_t i = 0; i < fragments.size(); ++i) { |
| const LayerFragment& fragment = fragments.at(i); |
| LayoutRect fragmentRect(layerBoundingBox); |
| fragmentRect.intersect(fragment.paginationClip); |
| fragmentRect.moveBy(fragment.paginationOffset); |
| result.unite(fragmentRect); |
| } |
| } |
| |
| return result; |
| } |
| |
| bool RenderFlowThread::cachedOffsetFromLogicalTopOfFirstRegion(const RenderBox* box, LayoutUnit& result) const |
| { |
| RenderBoxToOffsetMap::const_iterator offsetIterator = m_boxesToOffsetMap.find(box); |
| if (offsetIterator == m_boxesToOffsetMap.end()) |
| return false; |
| |
| result = offsetIterator->value; |
| return true; |
| } |
| |
| void RenderFlowThread::setOffsetFromLogicalTopOfFirstRegion(const RenderBox* box, LayoutUnit offset) |
| { |
| m_boxesToOffsetMap.set(box, offset); |
| } |
| |
| void RenderFlowThread::clearOffsetFromLogicalTopOfFirstRegion(const RenderBox* box) |
| { |
| ASSERT(m_boxesToOffsetMap.contains(box)); |
| m_boxesToOffsetMap.remove(box); |
| } |
| |
| const RenderBox* RenderFlowThread::currentStatePusherRenderBox() const |
| { |
| const RenderObject* currentObject = m_statePusherObjectsStack.isEmpty() ? 0 : m_statePusherObjectsStack.last(); |
| if (currentObject && currentObject->isBox()) |
| return toRenderBox(currentObject); |
| |
| return 0; |
| } |
| |
| void RenderFlowThread::pushFlowThreadLayoutState(const RenderObject* object) |
| { |
| if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) { |
| LayoutState* layoutState = currentBoxDescendant->view()->layoutState(); |
| if (layoutState && layoutState->isPaginated()) { |
| ASSERT(layoutState->renderer() == currentBoxDescendant); |
| LayoutSize offsetDelta = layoutState->m_layoutOffset - layoutState->m_pageOffset; |
| setOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant, currentBoxDescendant->isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width()); |
| } |
| } |
| |
| m_statePusherObjectsStack.add(object); |
| } |
| |
| void RenderFlowThread::popFlowThreadLayoutState() |
| { |
| m_statePusherObjectsStack.removeLast(); |
| |
| if (const RenderBox* currentBoxDescendant = currentStatePusherRenderBox()) { |
| LayoutState* layoutState = currentBoxDescendant->view()->layoutState(); |
| if (layoutState && layoutState->isPaginated()) |
| clearOffsetFromLogicalTopOfFirstRegion(currentBoxDescendant); |
| } |
| } |
| |
| LayoutUnit RenderFlowThread::offsetFromLogicalTopOfFirstRegion(const RenderBlock* currentBlock) const |
| { |
| // First check if we cached the offset for the block if it's an ancestor containing block of the box |
| // being currently laid out. |
| LayoutUnit offset; |
| if (cachedOffsetFromLogicalTopOfFirstRegion(currentBlock, offset)) |
| return offset; |
| |
| // If it's the current box being laid out, use the layout state. |
| const RenderBox* currentBoxDescendant = currentStatePusherRenderBox(); |
| if (currentBlock == currentBoxDescendant) { |
| LayoutState* layoutState = view()->layoutState(); |
| ASSERT(layoutState->renderer() == currentBlock); |
| ASSERT(layoutState && layoutState->isPaginated()); |
| LayoutSize offsetDelta = layoutState->m_layoutOffset - layoutState->m_pageOffset; |
| return currentBoxDescendant->isHorizontalWritingMode() ? offsetDelta.height() : offsetDelta.width(); |
| } |
| |
| // As a last resort, take the slow path. |
| LayoutRect blockRect(0, 0, currentBlock->width(), currentBlock->height()); |
| while (currentBlock && !currentBlock->isRenderFlowThread()) { |
| RenderBlock* containerBlock = currentBlock->containingBlock(); |
| ASSERT(containerBlock); |
| if (!containerBlock) |
| return 0; |
| LayoutPoint currentBlockLocation = currentBlock->location(); |
| |
| if (containerBlock->style()->writingMode() != currentBlock->style()->writingMode()) { |
| // We have to put the block rect in container coordinates |
| // and we have to take into account both the container and current block flipping modes |
| if (containerBlock->style()->isFlippedBlocksWritingMode()) { |
| if (containerBlock->isHorizontalWritingMode()) |
| blockRect.setY(currentBlock->height() - blockRect.maxY()); |
| else |
| blockRect.setX(currentBlock->width() - blockRect.maxX()); |
| } |
| currentBlock->flipForWritingMode(blockRect); |
| } |
| blockRect.moveBy(currentBlockLocation); |
| currentBlock = containerBlock; |
| } |
| |
| return currentBlock->isHorizontalWritingMode() ? blockRect.y() : blockRect.x(); |
| } |
| |
| void RenderFlowThread::RegionSearchAdapter::collectIfNeeded(const RegionInterval& interval) |
| { |
| if (m_result) |
| return; |
| if (interval.low() <= m_offset && interval.high() > m_offset) |
| m_result = interval.data(); |
| } |
| |
| void RenderFlowThread::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const |
| { |
| if (this == repaintContainer) |
| return; |
| |
| if (RenderRegion* region = mapFromFlowToRegion(transformState)) { |
| // FIXME: The cast below is probably not the best solution, we may need to find a better way. |
| static_cast<const RenderObject*>(region)->mapLocalToContainer(region->containerForRepaint(), transformState, mode, wasFixed); |
| } |
| } |
| |
| CurrentRenderFlowThreadMaintainer::CurrentRenderFlowThreadMaintainer(RenderFlowThread* renderFlowThread) |
| : m_renderFlowThread(renderFlowThread) |
| , m_previousRenderFlowThread(0) |
| { |
| if (!m_renderFlowThread) |
| return; |
| RenderView* view = m_renderFlowThread->view(); |
| m_previousRenderFlowThread = view->flowThreadController()->currentRenderFlowThread(); |
| ASSERT(!m_previousRenderFlowThread || !renderFlowThread->isRenderNamedFlowThread()); |
| view->flowThreadController()->setCurrentRenderFlowThread(m_renderFlowThread); |
| } |
| |
| CurrentRenderFlowThreadMaintainer::~CurrentRenderFlowThreadMaintainer() |
| { |
| if (!m_renderFlowThread) |
| return; |
| RenderView* view = m_renderFlowThread->view(); |
| ASSERT(view->flowThreadController()->currentRenderFlowThread() == m_renderFlowThread); |
| view->flowThreadController()->setCurrentRenderFlowThread(m_previousRenderFlowThread); |
| } |
| |
| |
| } // namespace WebCore |