| /* |
| * Copyright (C) 2011 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 |
| * OWNER OR CONTRIBUTORS 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 "RenderFlexibleBox.h" |
| |
| #include "LayoutRepainter.h" |
| #include "RenderLayer.h" |
| #include "RenderView.h" |
| #include <limits> |
| #include <wtf/MathExtras.h> |
| |
| namespace WebCore { |
| |
| struct RenderFlexibleBox::LineContext { |
| LineContext(LayoutUnit crossAxisOffset, LayoutUnit crossAxisExtent, size_t numberOfChildren, LayoutUnit maxAscent) |
| : crossAxisOffset(crossAxisOffset) |
| , crossAxisExtent(crossAxisExtent) |
| , numberOfChildren(numberOfChildren) |
| , maxAscent(maxAscent) |
| { |
| } |
| |
| LayoutUnit crossAxisOffset; |
| LayoutUnit crossAxisExtent; |
| size_t numberOfChildren; |
| LayoutUnit maxAscent; |
| }; |
| |
| struct RenderFlexibleBox::Violation { |
| Violation(RenderBox& child, LayoutUnit childSize) |
| : child(child) |
| , childSize(childSize) |
| { |
| } |
| |
| RenderBox& child; |
| LayoutUnit childSize; |
| }; |
| |
| |
| RenderFlexibleBox::RenderFlexibleBox(Element& element, PassRef<RenderStyle> style) |
| : RenderBlock(element, std::move(style), 0) |
| , m_orderIterator(*this) |
| , m_numberOfInFlowChildrenOnFirstLine(-1) |
| { |
| setChildrenInline(false); // All of our children must be block-level. |
| } |
| |
| RenderFlexibleBox::RenderFlexibleBox(Document& document, PassRef<RenderStyle> style) |
| : RenderBlock(document, std::move(style), 0) |
| , m_orderIterator(*this) |
| , m_numberOfInFlowChildrenOnFirstLine(-1) |
| { |
| setChildrenInline(false); // All of our children must be block-level. |
| } |
| |
| RenderFlexibleBox::~RenderFlexibleBox() |
| { |
| } |
| |
| const char* RenderFlexibleBox::renderName() const |
| { |
| return "RenderFlexibleBox"; |
| } |
| |
| void RenderFlexibleBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const |
| { |
| // FIXME: We're ignoring flex-basis here and we shouldn't. We can't start honoring it though until |
| // the flex shorthand stops setting it to 0. |
| // See https://bugs.webkit.org/show_bug.cgi?id=116117, |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| |
| LayoutUnit margin = marginIntrinsicLogicalWidthForChild(*child); |
| bool hasOrthogonalWritingMode = child->isHorizontalWritingMode() != isHorizontalWritingMode(); |
| LayoutUnit minPreferredLogicalWidth = hasOrthogonalWritingMode ? child->logicalHeight() : child->minPreferredLogicalWidth(); |
| LayoutUnit maxPreferredLogicalWidth = hasOrthogonalWritingMode ? child->logicalHeight() : child->maxPreferredLogicalWidth(); |
| minPreferredLogicalWidth += margin; |
| maxPreferredLogicalWidth += margin; |
| if (!isColumnFlow()) { |
| maxLogicalWidth += maxPreferredLogicalWidth; |
| if (isMultiline()) { |
| // For multiline, the min preferred width is if you put a break between each item. |
| minLogicalWidth = std::max(minLogicalWidth, minPreferredLogicalWidth); |
| } else |
| minLogicalWidth += minPreferredLogicalWidth; |
| } else { |
| minLogicalWidth = std::max(minPreferredLogicalWidth, minLogicalWidth); |
| if (isMultiline()) { |
| // For multiline, the max preferred width is if you never break between items. |
| maxLogicalWidth += maxPreferredLogicalWidth; |
| } else |
| maxLogicalWidth = std::max(maxPreferredLogicalWidth, maxLogicalWidth); |
| } |
| } |
| |
| maxLogicalWidth = std::max(minLogicalWidth, maxLogicalWidth); |
| |
| LayoutUnit scrollbarWidth = instrinsicScrollbarLogicalWidth(); |
| maxLogicalWidth += scrollbarWidth; |
| minLogicalWidth += scrollbarWidth; |
| } |
| |
| void RenderFlexibleBox::computePreferredLogicalWidths() |
| { |
| ASSERT(preferredLogicalWidthsDirty()); |
| |
| m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0; |
| |
| const RenderStyle& styleToUse = style(); |
| // FIXME: This should probably be checking for isSpecified since you should be able to use percentage, calc or viewport relative values for width. |
| if (styleToUse.logicalWidth().isFixed() && styleToUse.logicalWidth().value() > 0) |
| m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalWidth().value()); |
| else |
| computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth); |
| |
| // FIXME: This should probably be checking for isSpecified since you should be able to use percentage, calc or viewport relative values for min-width. |
| if (styleToUse.logicalMinWidth().isFixed() && styleToUse.logicalMinWidth().value() > 0) { |
| m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMinWidth().value())); |
| m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMinWidth().value())); |
| } |
| |
| // FIXME: This should probably be checking for isSpecified since you should be able to use percentage, calc or viewport relative values for maxWidth. |
| if (styleToUse.logicalMaxWidth().isFixed()) { |
| m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMaxWidth().value())); |
| m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse.logicalMaxWidth().value())); |
| } |
| |
| LayoutUnit borderAndPadding = borderAndPaddingLogicalWidth(); |
| m_minPreferredLogicalWidth += borderAndPadding; |
| m_maxPreferredLogicalWidth += borderAndPadding; |
| |
| setPreferredLogicalWidthsDirty(false); |
| } |
| |
| static int synthesizedBaselineFromContentBox(const RenderBox& box, LineDirectionMode direction) |
| { |
| return direction == HorizontalLine ? box.borderTop() + box.paddingTop() + box.contentHeight() : box.borderRight() + box.paddingRight() + box.contentWidth(); |
| } |
| |
| int RenderFlexibleBox::baselinePosition(FontBaseline, bool, LineDirectionMode direction, LinePositionMode) const |
| { |
| int baseline = firstLineBaseline(); |
| if (baseline == -1) |
| baseline = synthesizedBaselineFromContentBox(*this, direction); |
| |
| int marginAscent = direction == HorizontalLine ? marginTop() : marginRight(); |
| return baseline + marginAscent; |
| } |
| |
| int RenderFlexibleBox::firstLineBaseline() const |
| { |
| if (isWritingModeRoot() || m_numberOfInFlowChildrenOnFirstLine <= 0) |
| return -1; |
| RenderBox* baselineChild = 0; |
| int childNumber = 0; |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| if (alignmentForChild(*child) == AlignBaseline && !hasAutoMarginsInCrossAxis(*child)) { |
| baselineChild = child; |
| break; |
| } |
| if (!baselineChild) |
| baselineChild = child; |
| |
| ++childNumber; |
| if (childNumber == m_numberOfInFlowChildrenOnFirstLine) |
| break; |
| } |
| |
| if (!baselineChild) |
| return -1; |
| |
| if (!isColumnFlow() && hasOrthogonalFlow(*baselineChild)) |
| return crossAxisExtentForChild(*baselineChild) + baselineChild->logicalTop(); |
| if (isColumnFlow() && !hasOrthogonalFlow(*baselineChild)) |
| return mainAxisExtentForChild(*baselineChild) + baselineChild->logicalTop(); |
| |
| int baseline = baselineChild->firstLineBaseline(); |
| if (baseline == -1) { |
| // FIXME: We should pass |direction| into firstLineBoxBaseline and stop bailing out if we're a writing mode root. |
| // This would also fix some cases where the flexbox is orthogonal to its container. |
| LineDirectionMode direction = isHorizontalWritingMode() ? HorizontalLine : VerticalLine; |
| return synthesizedBaselineFromContentBox(*baselineChild, direction) + baselineChild->logicalTop(); |
| } |
| |
| return baseline + baselineChild->logicalTop(); |
| } |
| |
| int RenderFlexibleBox::inlineBlockBaseline(LineDirectionMode direction) const |
| { |
| int baseline = firstLineBaseline(); |
| if (baseline != -1) |
| return baseline; |
| |
| int marginAscent = direction == HorizontalLine ? marginTop() : marginRight(); |
| return synthesizedBaselineFromContentBox(*this, direction) + marginAscent; |
| } |
| |
| static EAlignItems resolveAlignment(const RenderStyle* parentStyle, const RenderStyle* childStyle) |
| { |
| EAlignItems align = childStyle->alignSelf(); |
| if (align == AlignAuto) |
| align = parentStyle->alignItems(); |
| return align; |
| } |
| |
| void RenderFlexibleBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| RenderBlock::styleDidChange(diff, oldStyle); |
| |
| if (oldStyle && oldStyle->alignItems() == AlignStretch && diff == StyleDifferenceLayout) { |
| // Flex items that were previously stretching need to be relayed out so we can compute new available cross axis space. |
| // This is only necessary for stretching since other alignment values don't change the size of the box. |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| EAlignItems previousAlignment = resolveAlignment(oldStyle, &child->style()); |
| if (previousAlignment == AlignStretch && previousAlignment != resolveAlignment(&style(), &child->style())) |
| child->setChildNeedsLayout(MarkOnlyThis); |
| } |
| } |
| } |
| |
| void RenderFlexibleBox::layoutBlock(bool relayoutChildren, LayoutUnit) |
| { |
| ASSERT(needsLayout()); |
| |
| if (!relayoutChildren && simplifiedLayout()) |
| return; |
| |
| LayoutRepainter repainter(*this, checkForRepaintDuringLayout()); |
| |
| if (updateLogicalWidthAndColumnWidth()) |
| relayoutChildren = true; |
| |
| LayoutUnit previousHeight = logicalHeight(); |
| setLogicalHeight(borderAndPaddingLogicalHeight() + scrollbarLogicalHeight()); |
| |
| LayoutStateMaintainer statePusher(view(), *this, locationOffset(), hasTransform() || hasReflection() || style().isFlippedBlocksWritingMode()); |
| |
| prepareShapesAndPaginationBeforeBlockLayout(relayoutChildren); |
| |
| m_numberOfInFlowChildrenOnFirstLine = -1; |
| |
| RenderBlock::startDelayUpdateScrollInfo(); |
| |
| dirtyForLayoutFromPercentageHeightDescendants(); |
| |
| Vector<LineContext> lineContexts; |
| OrderIterator::OrderValues orderValues; |
| computeMainAxisPreferredSizes(orderValues); |
| m_orderIterator.setOrderValues(std::move(orderValues)); |
| |
| ChildFrameRects oldChildRects; |
| appendChildFrameRects(oldChildRects); |
| layoutFlexItems(relayoutChildren, lineContexts); |
| |
| updateLogicalHeight(); |
| repositionLogicalHeightDependentFlexItems(lineContexts); |
| |
| RenderBlock::finishDelayUpdateScrollInfo(); |
| |
| if (logicalHeight() != previousHeight) |
| relayoutChildren = true; |
| |
| layoutPositionedObjects(relayoutChildren || isRoot()); |
| |
| updateShapesAfterBlockLayout(); |
| |
| repaintChildrenDuringLayoutIfMoved(oldChildRects); |
| // FIXME: css3/flexbox/repaint-rtl-column.html seems to repaint more overflow than it needs to. |
| computeOverflow(clientLogicalBottomAfterRepositioning()); |
| statePusher.pop(); |
| |
| updateLayerTransform(); |
| |
| // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if |
| // we overflow or not. |
| updateScrollInfoAfterLayout(); |
| |
| repainter.repaintAfterLayout(); |
| |
| clearNeedsLayout(); |
| } |
| |
| void RenderFlexibleBox::appendChildFrameRects(ChildFrameRects& childFrameRects) |
| { |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| if (!child->isOutOfFlowPositioned()) |
| childFrameRects.append(child->frameRect()); |
| } |
| } |
| |
| void RenderFlexibleBox::repaintChildrenDuringLayoutIfMoved(const ChildFrameRects& oldChildRects) |
| { |
| size_t childIndex = 0; |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| |
| // If the child moved, we have to repaint it as well as any floating/positioned |
| // descendants. An exception is if we need a layout. In this case, we know we're going to |
| // repaint ourselves (and the child) anyway. |
| if (!selfNeedsLayout() && child->checkForRepaintDuringLayout()) |
| child->repaintDuringLayoutIfMoved(oldChildRects[childIndex]); |
| ++childIndex; |
| } |
| ASSERT(childIndex == oldChildRects.size()); |
| } |
| |
| void RenderFlexibleBox::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset, PaintInfo& paintInfoForChild, bool usePrintRect) |
| { |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| if (!paintChild(*child, paintInfo, paintOffset, paintInfoForChild, usePrintRect)) |
| return; |
| } |
| } |
| |
| void RenderFlexibleBox::repositionLogicalHeightDependentFlexItems(Vector<LineContext>& lineContexts) |
| { |
| LayoutUnit crossAxisStartEdge = lineContexts.isEmpty() ? LayoutUnit() : lineContexts[0].crossAxisOffset; |
| alignFlexLines(lineContexts); |
| |
| // If we have a single line flexbox, the line height is all the available space. |
| // For flex-direction: row, this means we need to use the height, so we do this after calling updateLogicalHeight. |
| if (!isMultiline() && lineContexts.size() == 1) |
| lineContexts[0].crossAxisExtent = crossAxisContentExtent(); |
| alignChildren(lineContexts); |
| |
| if (style().flexWrap() == FlexWrapReverse) |
| flipForWrapReverse(lineContexts, crossAxisStartEdge); |
| |
| // direction:rtl + flex-direction:column means the cross-axis direction is flipped. |
| flipForRightToLeftColumn(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::clientLogicalBottomAfterRepositioning() |
| { |
| LayoutUnit maxChildLogicalBottom = 0; |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| LayoutUnit childLogicalBottom = logicalTopForChild(*child) + logicalHeightForChild(*child) + marginAfterForChild(*child); |
| maxChildLogicalBottom = std::max(maxChildLogicalBottom, childLogicalBottom); |
| } |
| return std::max(clientLogicalBottom(), maxChildLogicalBottom); |
| } |
| |
| bool RenderFlexibleBox::hasOrthogonalFlow(RenderBox& child) const |
| { |
| // FIXME: If the child is a flexbox, then we need to check isHorizontalFlow. |
| return isHorizontalFlow() != child.isHorizontalWritingMode(); |
| } |
| |
| bool RenderFlexibleBox::isColumnFlow() const |
| { |
| return style().isColumnFlexDirection(); |
| } |
| |
| bool RenderFlexibleBox::isHorizontalFlow() const |
| { |
| if (isHorizontalWritingMode()) |
| return !isColumnFlow(); |
| return isColumnFlow(); |
| } |
| |
| bool RenderFlexibleBox::isLeftToRightFlow() const |
| { |
| if (isColumnFlow()) |
| return style().writingMode() == TopToBottomWritingMode || style().writingMode() == LeftToRightWritingMode; |
| return style().isLeftToRightDirection() ^ (style().flexDirection() == FlowRowReverse); |
| } |
| |
| bool RenderFlexibleBox::isMultiline() const |
| { |
| return style().flexWrap() != FlexNoWrap; |
| } |
| |
| Length RenderFlexibleBox::flexBasisForChild(RenderBox& child) const |
| { |
| Length flexLength = child.style().flexBasis(); |
| if (flexLength.isAuto()) |
| flexLength = isHorizontalFlow() ? child.style().width() : child.style().height(); |
| return flexLength; |
| } |
| |
| void RenderFlexibleBox::setCrossAxisExtent(LayoutUnit extent) |
| { |
| if (isHorizontalFlow()) |
| setHeight(extent); |
| else |
| setWidth(extent); |
| } |
| |
| LayoutUnit RenderFlexibleBox::crossAxisExtentForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.height() : child.width(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::mainAxisExtentForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.width() : child.height(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::crossAxisExtent() const |
| { |
| return isHorizontalFlow() ? height() : width(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::mainAxisExtent() const |
| { |
| return isHorizontalFlow() ? width() : height(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::crossAxisContentExtent() const |
| { |
| return isHorizontalFlow() ? contentHeight() : contentWidth(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::mainAxisContentExtent(LayoutUnit contentLogicalHeight) |
| { |
| if (isColumnFlow()) { |
| LogicalExtentComputedValues computedValues; |
| LayoutUnit borderPaddingAndScrollbar = borderAndPaddingLogicalHeight() + scrollbarLogicalHeight(); |
| if (contentLogicalHeight > LayoutUnit::max() - borderPaddingAndScrollbar) |
| contentLogicalHeight -= borderPaddingAndScrollbar; |
| LayoutUnit borderBoxLogicalHeight = contentLogicalHeight + borderPaddingAndScrollbar; |
| computeLogicalHeight(borderBoxLogicalHeight, logicalTop(), computedValues); |
| if (computedValues.m_extent == LayoutUnit::max()) |
| return computedValues.m_extent; |
| return std::max(LayoutUnit(0), computedValues.m_extent - borderPaddingAndScrollbar); |
| } |
| return contentLogicalWidth(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::computeMainAxisExtentForChild(RenderBox& child, SizeType sizeType, const Length& size) |
| { |
| // FIXME: This is wrong for orthogonal flows. It should use the flexbox's writing-mode, not the child's in order |
| // to figure out the logical height/width. |
| // FIXME: This is wrong if the height is set to an intrinsic keyword value. computeContentLogicalHeight will return -1. |
| // Instead, we need to layout the child an get the appropriate height value. |
| // https://bugs.webkit.org/show_bug.cgi?id=113610 |
| if (isColumnFlow()) |
| return child.computeContentLogicalHeight(size); |
| // FIXME: Figure out how this should work for regions and pass in the appropriate values. |
| RenderRegion* region = 0; |
| return child.computeLogicalWidthInRegionUsing(sizeType, size, contentLogicalWidth(), this, region) - child.borderAndPaddingLogicalWidth(); |
| } |
| |
| WritingMode RenderFlexibleBox::transformedWritingMode() const |
| { |
| WritingMode mode = style().writingMode(); |
| if (!isColumnFlow()) |
| return mode; |
| |
| switch (mode) { |
| case TopToBottomWritingMode: |
| case BottomToTopWritingMode: |
| return style().isLeftToRightDirection() ? LeftToRightWritingMode : RightToLeftWritingMode; |
| case LeftToRightWritingMode: |
| case RightToLeftWritingMode: |
| return style().isLeftToRightDirection() ? TopToBottomWritingMode : BottomToTopWritingMode; |
| } |
| ASSERT_NOT_REACHED(); |
| return TopToBottomWritingMode; |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareBorderStart() const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? borderLeft() : borderRight(); |
| return isLeftToRightFlow() ? borderTop() : borderBottom(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareBorderEnd() const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? borderRight() : borderLeft(); |
| return isLeftToRightFlow() ? borderBottom() : borderTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareBorderBefore() const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return borderTop(); |
| case BottomToTopWritingMode: |
| return borderBottom(); |
| case LeftToRightWritingMode: |
| return borderLeft(); |
| case RightToLeftWritingMode: |
| return borderRight(); |
| } |
| ASSERT_NOT_REACHED(); |
| return borderTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareBorderAfter() const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return borderBottom(); |
| case BottomToTopWritingMode: |
| return borderTop(); |
| case LeftToRightWritingMode: |
| return borderRight(); |
| case RightToLeftWritingMode: |
| return borderLeft(); |
| } |
| ASSERT_NOT_REACHED(); |
| return borderTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwarePaddingStart() const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? paddingLeft() : paddingRight(); |
| return isLeftToRightFlow() ? paddingTop() : paddingBottom(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwarePaddingEnd() const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? paddingRight() : paddingLeft(); |
| return isLeftToRightFlow() ? paddingBottom() : paddingTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwarePaddingBefore() const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return paddingTop(); |
| case BottomToTopWritingMode: |
| return paddingBottom(); |
| case LeftToRightWritingMode: |
| return paddingLeft(); |
| case RightToLeftWritingMode: |
| return paddingRight(); |
| } |
| ASSERT_NOT_REACHED(); |
| return paddingTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwarePaddingAfter() const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return paddingBottom(); |
| case BottomToTopWritingMode: |
| return paddingTop(); |
| case LeftToRightWritingMode: |
| return paddingRight(); |
| case RightToLeftWritingMode: |
| return paddingLeft(); |
| } |
| ASSERT_NOT_REACHED(); |
| return paddingTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareMarginStartForChild(RenderBox& child) const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? child.marginLeft() : child.marginRight(); |
| return isLeftToRightFlow() ? child.marginTop() : child.marginBottom(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareMarginEndForChild(RenderBox& child) const |
| { |
| if (isHorizontalFlow()) |
| return isLeftToRightFlow() ? child.marginRight() : child.marginLeft(); |
| return isLeftToRightFlow() ? child.marginBottom() : child.marginTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareMarginBeforeForChild(RenderBox& child) const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return child.marginTop(); |
| case BottomToTopWritingMode: |
| return child.marginBottom(); |
| case LeftToRightWritingMode: |
| return child.marginLeft(); |
| case RightToLeftWritingMode: |
| return child.marginRight(); |
| } |
| ASSERT_NOT_REACHED(); |
| return marginTop(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::flowAwareMarginAfterForChild(RenderBox& child) const |
| { |
| switch (transformedWritingMode()) { |
| case TopToBottomWritingMode: |
| return child.marginBottom(); |
| case BottomToTopWritingMode: |
| return child.marginTop(); |
| case LeftToRightWritingMode: |
| return child.marginRight(); |
| case RightToLeftWritingMode: |
| return child.marginLeft(); |
| } |
| ASSERT_NOT_REACHED(); |
| return marginBottom(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::crossAxisMarginExtentForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.marginHeight() : child.marginWidth(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::crossAxisScrollbarExtent() const |
| { |
| return isHorizontalFlow() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); |
| } |
| |
| LayoutPoint RenderFlexibleBox::flowAwareLocationForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.location() : child.location().transposedPoint(); |
| } |
| |
| void RenderFlexibleBox::setFlowAwareLocationForChild(RenderBox& child, const LayoutPoint& location) |
| { |
| if (isHorizontalFlow()) |
| child.setLocation(location); |
| else |
| child.setLocation(location.transposedPoint()); |
| } |
| |
| LayoutUnit RenderFlexibleBox::mainAxisBorderAndPaddingExtentForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.borderAndPaddingWidth() : child.borderAndPaddingHeight(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::mainAxisScrollbarExtentForChild(RenderBox& child) const |
| { |
| return isHorizontalFlow() ? child.verticalScrollbarWidth() : child.horizontalScrollbarHeight(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::preferredMainAxisContentExtentForChild(RenderBox& child, bool hasInfiniteLineLength) |
| { |
| bool hasOverrideSize = child.hasOverrideWidth() || child.hasOverrideHeight(); |
| if (hasOverrideSize) |
| child.clearOverrideSize(); |
| |
| Length flexBasis = flexBasisForChild(child); |
| if (flexBasis.isAuto() || (flexBasis.isFixed() && !flexBasis.value() && hasInfiniteLineLength)) { |
| if (hasOrthogonalFlow(child)) { |
| if (hasOverrideSize) |
| child.setChildNeedsLayout(MarkOnlyThis); |
| child.layoutIfNeeded(); |
| } |
| LayoutUnit mainAxisExtent = hasOrthogonalFlow(child) ? child.logicalHeight() : child.maxPreferredLogicalWidth(); |
| ASSERT(mainAxisExtent - mainAxisBorderAndPaddingExtentForChild(child) >= 0); |
| return mainAxisExtent - mainAxisBorderAndPaddingExtentForChild(child); |
| } |
| return std::max(LayoutUnit(0), computeMainAxisExtentForChild(child, MainOrPreferredSize, flexBasis)); |
| } |
| |
| void RenderFlexibleBox::layoutFlexItems(bool relayoutChildren, Vector<LineContext>& lineContexts) |
| { |
| OrderedFlexItemList orderedChildren; |
| LayoutUnit preferredMainAxisExtent; |
| double totalFlexGrow; |
| double totalWeightedFlexShrink; |
| LayoutUnit minMaxAppliedMainAxisExtent; |
| |
| m_orderIterator.first(); |
| LayoutUnit crossAxisOffset = flowAwareBorderBefore() + flowAwarePaddingBefore(); |
| bool hasInfiniteLineLength = false; |
| while (computeNextFlexLine(orderedChildren, preferredMainAxisExtent, totalFlexGrow, totalWeightedFlexShrink, minMaxAppliedMainAxisExtent, hasInfiniteLineLength)) { |
| LayoutUnit availableFreeSpace = mainAxisContentExtent(preferredMainAxisExtent) - preferredMainAxisExtent; |
| FlexSign flexSign = (minMaxAppliedMainAxisExtent < preferredMainAxisExtent + availableFreeSpace) ? PositiveFlexibility : NegativeFlexibility; |
| InflexibleFlexItemSize inflexibleItems; |
| Vector<LayoutUnit> childSizes; |
| while (!resolveFlexibleLengths(flexSign, orderedChildren, availableFreeSpace, totalFlexGrow, totalWeightedFlexShrink, inflexibleItems, childSizes, hasInfiniteLineLength)) { |
| ASSERT(totalFlexGrow >= 0 && totalWeightedFlexShrink >= 0); |
| ASSERT(inflexibleItems.size() > 0); |
| } |
| |
| layoutAndPlaceChildren(crossAxisOffset, orderedChildren, childSizes, availableFreeSpace, relayoutChildren, lineContexts); |
| } |
| if (hasLineIfEmpty()) { |
| // Even if computeNextFlexLine returns true, the flexbox might not have |
| // a line because all our children might be out of flow positioned. |
| // Instead of just checking if we have a line, make sure the flexbox |
| // has at least a line's worth of height to cover this case. |
| LayoutUnit minHeight = borderAndPaddingLogicalHeight() |
| + lineHeight(true, isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes) |
| + scrollbarLogicalHeight(); |
| if (height() < minHeight) |
| setLogicalHeight(minHeight); |
| } |
| } |
| |
| LayoutUnit RenderFlexibleBox::autoMarginOffsetInMainAxis(const OrderedFlexItemList& children, LayoutUnit& availableFreeSpace) |
| { |
| if (availableFreeSpace <= 0) |
| return 0; |
| |
| int numberOfAutoMargins = 0; |
| bool isHorizontal = isHorizontalFlow(); |
| for (size_t i = 0; i < children.size(); ++i) { |
| RenderBox* child = children[i]; |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| if (isHorizontal) { |
| if (child->style().marginLeft().isAuto()) |
| ++numberOfAutoMargins; |
| if (child->style().marginRight().isAuto()) |
| ++numberOfAutoMargins; |
| } else { |
| if (child->style().marginTop().isAuto()) |
| ++numberOfAutoMargins; |
| if (child->style().marginBottom().isAuto()) |
| ++numberOfAutoMargins; |
| } |
| } |
| if (!numberOfAutoMargins) |
| return 0; |
| |
| LayoutUnit sizeOfAutoMargin = availableFreeSpace / numberOfAutoMargins; |
| availableFreeSpace = 0; |
| return sizeOfAutoMargin; |
| } |
| |
| void RenderFlexibleBox::updateAutoMarginsInMainAxis(RenderBox& child, LayoutUnit autoMarginOffset) |
| { |
| ASSERT(autoMarginOffset >= 0); |
| |
| if (isHorizontalFlow()) { |
| if (child.style().marginLeft().isAuto()) |
| child.setMarginLeft(autoMarginOffset); |
| if (child.style().marginRight().isAuto()) |
| child.setMarginRight(autoMarginOffset); |
| } else { |
| if (child.style().marginTop().isAuto()) |
| child.setMarginTop(autoMarginOffset); |
| if (child.style().marginBottom().isAuto()) |
| child.setMarginBottom(autoMarginOffset); |
| } |
| } |
| |
| bool RenderFlexibleBox::hasAutoMarginsInCrossAxis(RenderBox& child) const |
| { |
| if (isHorizontalFlow()) |
| return child.style().marginTop().isAuto() || child.style().marginBottom().isAuto(); |
| return child.style().marginLeft().isAuto() || child.style().marginRight().isAuto(); |
| } |
| |
| LayoutUnit RenderFlexibleBox::availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, RenderBox& child) |
| { |
| ASSERT(!child.isOutOfFlowPositioned()); |
| LayoutUnit childCrossExtent = crossAxisMarginExtentForChild(child) + crossAxisExtentForChild(child); |
| return lineCrossAxisExtent - childCrossExtent; |
| } |
| |
| bool RenderFlexibleBox::updateAutoMarginsInCrossAxis(RenderBox& child, LayoutUnit availableAlignmentSpace) |
| { |
| ASSERT(!child.isOutOfFlowPositioned()); |
| ASSERT(availableAlignmentSpace >= 0); |
| |
| bool isHorizontal = isHorizontalFlow(); |
| Length start = isHorizontal ? child.style().marginTop() : child.style().marginLeft(); |
| Length end = isHorizontal ? child.style().marginBottom() : child.style().marginRight(); |
| if (start.isAuto() && end.isAuto()) { |
| adjustAlignmentForChild(child, availableAlignmentSpace / 2); |
| if (isHorizontal) { |
| child.setMarginTop(availableAlignmentSpace / 2); |
| child.setMarginBottom(availableAlignmentSpace / 2); |
| } else { |
| child.setMarginLeft(availableAlignmentSpace / 2); |
| child.setMarginRight(availableAlignmentSpace / 2); |
| } |
| return true; |
| } |
| if (start.isAuto()) { |
| adjustAlignmentForChild(child, availableAlignmentSpace); |
| if (isHorizontal) |
| child.setMarginTop(availableAlignmentSpace); |
| else |
| child.setMarginLeft(availableAlignmentSpace); |
| return true; |
| } |
| if (end.isAuto()) { |
| if (isHorizontal) |
| child.setMarginBottom(availableAlignmentSpace); |
| else |
| child.setMarginRight(availableAlignmentSpace); |
| return true; |
| } |
| return false; |
| } |
| |
| LayoutUnit RenderFlexibleBox::marginBoxAscentForChild(RenderBox& child) |
| { |
| LayoutUnit ascent = child.firstLineBaseline(); |
| if (ascent == -1) |
| ascent = crossAxisExtentForChild(child); |
| return ascent + flowAwareMarginBeforeForChild(child); |
| } |
| |
| LayoutUnit RenderFlexibleBox::computeChildMarginValue(const Length& margin) |
| { |
| // When resolving the margins, we use the content size for resolving percent and calc (for percents in calc expressions) margins. |
| // Fortunately, percent margins are always computed with respect to the block's width, even for margin-top and margin-bottom. |
| LayoutUnit availableSize = contentLogicalWidth(); |
| return minimumValueForLength(margin, availableSize); |
| } |
| |
| void RenderFlexibleBox::computeMainAxisPreferredSizes(OrderIterator::OrderValues& orderValues) |
| { |
| ASSERT(orderValues.isEmpty()); |
| |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| // Avoid growing the vector for the common-case default value of 0. This optimizes the most common case which is |
| // one or a few values with the default order 0 |
| int order = child->style().order(); |
| if (orderValues.isEmpty() || orderValues.last() != order) |
| orderValues.append(order); |
| |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| |
| // Before running the flex algorithm, 'auto' has a margin of 0. |
| // Also, if we're not auto sizing, we don't do a layout that computes the start/end margins. |
| if (isHorizontalFlow()) { |
| child->setMarginLeft(computeChildMarginValue(child->style().marginLeft())); |
| child->setMarginRight(computeChildMarginValue(child->style().marginRight())); |
| } else { |
| child->setMarginTop(computeChildMarginValue(child->style().marginTop())); |
| child->setMarginBottom(computeChildMarginValue(child->style().marginBottom())); |
| } |
| } |
| } |
| |
| LayoutUnit RenderFlexibleBox::adjustChildSizeForMinAndMax(RenderBox& child, LayoutUnit childSize) |
| { |
| Length max = isHorizontalFlow() ? child.style().maxWidth() : child.style().maxHeight(); |
| if (max.isSpecifiedOrIntrinsic()) { |
| LayoutUnit maxExtent = computeMainAxisExtentForChild(child, MaxSize, max); |
| if (maxExtent != -1 && childSize > maxExtent) |
| childSize = maxExtent; |
| } |
| |
| Length min = isHorizontalFlow() ? child.style().minWidth() : child.style().minHeight(); |
| LayoutUnit minExtent = 0; |
| if (min.isSpecifiedOrIntrinsic()) |
| minExtent = computeMainAxisExtentForChild(child, MinSize, min); |
| return std::max(childSize, minExtent); |
| } |
| |
| bool RenderFlexibleBox::computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& preferredMainAxisExtent, double& totalFlexGrow, double& totalWeightedFlexShrink, LayoutUnit& minMaxAppliedMainAxisExtent, bool& hasInfiniteLineLength) |
| { |
| orderedChildren.clear(); |
| preferredMainAxisExtent = 0; |
| totalFlexGrow = totalWeightedFlexShrink = 0; |
| minMaxAppliedMainAxisExtent = 0; |
| |
| if (!m_orderIterator.currentChild()) |
| return false; |
| |
| LayoutUnit lineBreakLength = mainAxisContentExtent(LayoutUnit::max()); |
| hasInfiniteLineLength = lineBreakLength == LayoutUnit::max(); |
| |
| bool lineHasInFlowItem = false; |
| |
| for (RenderBox* child = m_orderIterator.currentChild(); child; child = m_orderIterator.next()) { |
| if (child->isOutOfFlowPositioned()) { |
| orderedChildren.append(child); |
| continue; |
| } |
| |
| LayoutUnit childMainAxisExtent = preferredMainAxisContentExtentForChild(*child, hasInfiniteLineLength); |
| LayoutUnit childMainAxisMarginBoxExtent = mainAxisBorderAndPaddingExtentForChild(*child) + childMainAxisExtent; |
| childMainAxisMarginBoxExtent += isHorizontalFlow() ? child->marginWidth() : child->marginHeight(); |
| |
| if (isMultiline() && preferredMainAxisExtent + childMainAxisMarginBoxExtent > lineBreakLength && lineHasInFlowItem) |
| break; |
| orderedChildren.append(child); |
| lineHasInFlowItem = true; |
| preferredMainAxisExtent += childMainAxisMarginBoxExtent; |
| totalFlexGrow += child->style().flexGrow(); |
| totalWeightedFlexShrink += child->style().flexShrink() * childMainAxisExtent; |
| |
| LayoutUnit childMinMaxAppliedMainAxisExtent = adjustChildSizeForMinAndMax(*child, childMainAxisExtent); |
| minMaxAppliedMainAxisExtent += childMinMaxAppliedMainAxisExtent - childMainAxisExtent + childMainAxisMarginBoxExtent; |
| } |
| return true; |
| } |
| |
| void RenderFlexibleBox::freezeViolations(const Vector<Violation>& violations, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize& inflexibleItems, bool hasInfiniteLineLength) |
| { |
| for (size_t i = 0; i < violations.size(); ++i) { |
| RenderBox& child = violations[i].child; |
| LayoutUnit childSize = violations[i].childSize; |
| LayoutUnit preferredChildSize = preferredMainAxisContentExtentForChild(child, hasInfiniteLineLength); |
| availableFreeSpace -= childSize - preferredChildSize; |
| totalFlexGrow -= child.style().flexGrow(); |
| totalWeightedFlexShrink -= child.style().flexShrink() * preferredChildSize; |
| inflexibleItems.set(&child, childSize); |
| } |
| } |
| |
| // Returns true if we successfully ran the algorithm and sized the flex items. |
| bool RenderFlexibleBox::resolveFlexibleLengths(FlexSign flexSign, const OrderedFlexItemList& children, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize& inflexibleItems, Vector<LayoutUnit>& childSizes, bool hasInfiniteLineLength) |
| { |
| childSizes.clear(); |
| LayoutUnit totalViolation = 0; |
| LayoutUnit usedFreeSpace = 0; |
| Vector<Violation> minViolations; |
| Vector<Violation> maxViolations; |
| for (size_t i = 0; i < children.size(); ++i) { |
| RenderBox& child = *children[i]; |
| if (child.isOutOfFlowPositioned()) { |
| childSizes.append(0); |
| continue; |
| } |
| |
| if (inflexibleItems.contains(&child)) |
| childSizes.append(inflexibleItems.get(&child)); |
| else { |
| LayoutUnit preferredChildSize = preferredMainAxisContentExtentForChild(child, hasInfiniteLineLength); |
| LayoutUnit childSize = preferredChildSize; |
| double extraSpace = 0; |
| if (availableFreeSpace > 0 && totalFlexGrow > 0 && flexSign == PositiveFlexibility && std::isfinite(totalFlexGrow)) |
| extraSpace = availableFreeSpace * child.style().flexGrow() / totalFlexGrow; |
| else if (availableFreeSpace < 0 && totalWeightedFlexShrink > 0 && flexSign == NegativeFlexibility && std::isfinite(totalWeightedFlexShrink)) |
| extraSpace = availableFreeSpace * child.style().flexShrink() * preferredChildSize / totalWeightedFlexShrink; |
| if (std::isfinite(extraSpace)) |
| childSize += roundedLayoutUnit(extraSpace); |
| |
| LayoutUnit adjustedChildSize = adjustChildSizeForMinAndMax(child, childSize); |
| childSizes.append(adjustedChildSize); |
| usedFreeSpace += adjustedChildSize - preferredChildSize; |
| |
| LayoutUnit violation = adjustedChildSize - childSize; |
| if (violation > 0) |
| minViolations.append(Violation(child, adjustedChildSize)); |
| else if (violation < 0) |
| maxViolations.append(Violation(child, adjustedChildSize)); |
| totalViolation += violation; |
| } |
| } |
| |
| if (totalViolation) |
| freezeViolations(totalViolation < 0 ? maxViolations : minViolations, availableFreeSpace, totalFlexGrow, totalWeightedFlexShrink, inflexibleItems, hasInfiniteLineLength); |
| else |
| availableFreeSpace -= usedFreeSpace; |
| |
| return !totalViolation; |
| } |
| |
| static LayoutUnit initialJustifyContentOffset(LayoutUnit availableFreeSpace, EJustifyContent justifyContent, unsigned numberOfChildren) |
| { |
| if (justifyContent == JustifyFlexEnd) |
| return availableFreeSpace; |
| if (justifyContent == JustifyCenter) |
| return availableFreeSpace / 2; |
| if (justifyContent == JustifySpaceAround) { |
| if (availableFreeSpace > 0 && numberOfChildren) |
| return availableFreeSpace / (2 * numberOfChildren); |
| else |
| return availableFreeSpace / 2; |
| } |
| return 0; |
| } |
| |
| static LayoutUnit justifyContentSpaceBetweenChildren(LayoutUnit availableFreeSpace, EJustifyContent justifyContent, unsigned numberOfChildren) |
| { |
| if (availableFreeSpace > 0 && numberOfChildren > 1) { |
| if (justifyContent == JustifySpaceBetween) |
| return availableFreeSpace / (numberOfChildren - 1); |
| if (justifyContent == JustifySpaceAround) |
| return availableFreeSpace / numberOfChildren; |
| } |
| return 0; |
| } |
| |
| void RenderFlexibleBox::setLogicalOverrideSize(RenderBox& child, LayoutUnit childPreferredSize) |
| { |
| if (hasOrthogonalFlow(child)) |
| child.setOverrideLogicalContentHeight(childPreferredSize - child.borderAndPaddingLogicalHeight()); |
| else |
| child.setOverrideLogicalContentWidth(childPreferredSize - child.borderAndPaddingLogicalWidth()); |
| } |
| |
| void RenderFlexibleBox::prepareChildForPositionedLayout(RenderBox& child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset, PositionedLayoutMode layoutMode) |
| { |
| ASSERT(child.isOutOfFlowPositioned()); |
| child.containingBlock()->insertPositionedObject(child); |
| RenderLayer* childLayer = child.layer(); |
| LayoutUnit inlinePosition = isColumnFlow() ? crossAxisOffset : mainAxisOffset; |
| if (layoutMode == FlipForRowReverse && style().flexDirection() == FlowRowReverse) |
| inlinePosition = mainAxisExtent() - mainAxisOffset; |
| childLayer->setStaticInlinePosition(inlinePosition); // FIXME: Not right for regions. |
| |
| LayoutUnit staticBlockPosition = isColumnFlow() ? mainAxisOffset : crossAxisOffset; |
| if (childLayer->staticBlockPosition() != staticBlockPosition) { |
| childLayer->setStaticBlockPosition(staticBlockPosition); |
| if (child.style().hasStaticBlockPosition(style().isHorizontalWritingMode())) |
| child.setChildNeedsLayout(MarkOnlyThis); |
| } |
| } |
| |
| EAlignItems RenderFlexibleBox::alignmentForChild(RenderBox& child) const |
| { |
| EAlignItems align = resolveAlignment(&style(), &child.style()); |
| |
| if (align == AlignBaseline && hasOrthogonalFlow(child)) |
| align = AlignFlexStart; |
| |
| if (style().flexWrap() == FlexWrapReverse) { |
| if (align == AlignFlexStart) |
| align = AlignFlexEnd; |
| else if (align == AlignFlexEnd) |
| align = AlignFlexStart; |
| } |
| |
| return align; |
| } |
| |
| size_t RenderFlexibleBox::numberOfInFlowPositionedChildren(const OrderedFlexItemList& children) const |
| { |
| size_t count = 0; |
| for (size_t i = 0; i < children.size(); ++i) { |
| RenderBox* child = children[i]; |
| if (!child->isOutOfFlowPositioned()) |
| ++count; |
| } |
| return count; |
| } |
| |
| bool RenderFlexibleBox::needToStretchChild(RenderBox& child) |
| { |
| if (alignmentForChild(child) != AlignStretch) |
| return false; |
| |
| Length crossAxisLength = isHorizontalFlow() ? child.style().height() : child.style().width(); |
| return crossAxisLength.isAuto(); |
| } |
| |
| void RenderFlexibleBox::resetAutoMarginsAndLogicalTopInCrossAxis(RenderBox& child) |
| { |
| if (hasAutoMarginsInCrossAxis(child)) |
| child.updateLogicalHeight(); |
| } |
| |
| void RenderFlexibleBox::layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList& children, const Vector<LayoutUnit>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, Vector<LineContext>& lineContexts) |
| { |
| ASSERT(childSizes.size() == children.size()); |
| |
| size_t numberOfChildrenForJustifyContent = numberOfInFlowPositionedChildren(children); |
| LayoutUnit autoMarginOffset = autoMarginOffsetInMainAxis(children, availableFreeSpace); |
| LayoutUnit mainAxisOffset = flowAwareBorderStart() + flowAwarePaddingStart(); |
| mainAxisOffset += initialJustifyContentOffset(availableFreeSpace, style().justifyContent(), numberOfChildrenForJustifyContent); |
| if (style().flexDirection() == FlowRowReverse) |
| mainAxisOffset += isHorizontalFlow() ? verticalScrollbarWidth() : horizontalScrollbarHeight(); |
| |
| LayoutUnit totalMainExtent = mainAxisExtent(); |
| LayoutUnit maxAscent = 0, maxDescent = 0; // Used when align-items: baseline. |
| LayoutUnit maxChildCrossAxisExtent = 0; |
| size_t seenInFlowPositionedChildren = 0; |
| bool shouldFlipMainAxis = !isColumnFlow() && !isLeftToRightFlow(); |
| for (size_t i = 0; i < children.size(); ++i) { |
| RenderBox& child = *children[i]; |
| if (child.isOutOfFlowPositioned()) { |
| prepareChildForPositionedLayout(child, mainAxisOffset, crossAxisOffset, FlipForRowReverse); |
| continue; |
| } |
| |
| LayoutUnit childPreferredSize = childSizes[i] + mainAxisBorderAndPaddingExtentForChild(child); |
| setLogicalOverrideSize(child, childPreferredSize); |
| // FIXME: Can avoid laying out here in some cases. See https://webkit.org/b/87905. |
| if (needToStretchChild(child) || childPreferredSize != mainAxisExtentForChild(child)) |
| child.setChildNeedsLayout(MarkOnlyThis); |
| else { |
| // To avoid double applying margin changes in updateAutoMarginsInCrossAxis, we reset the margins here. |
| resetAutoMarginsAndLogicalTopInCrossAxis(child); |
| } |
| updateBlockChildDirtyBitsBeforeLayout(relayoutChildren, child); |
| child.layoutIfNeeded(); |
| |
| updateAutoMarginsInMainAxis(child, autoMarginOffset); |
| |
| LayoutUnit childCrossAxisMarginBoxExtent; |
| if (alignmentForChild(child) == AlignBaseline && !hasAutoMarginsInCrossAxis(child)) { |
| LayoutUnit ascent = marginBoxAscentForChild(child); |
| LayoutUnit descent = (crossAxisMarginExtentForChild(child) + crossAxisExtentForChild(child)) - ascent; |
| |
| maxAscent = std::max(maxAscent, ascent); |
| maxDescent = std::max(maxDescent, descent); |
| |
| childCrossAxisMarginBoxExtent = maxAscent + maxDescent; |
| } else |
| childCrossAxisMarginBoxExtent = crossAxisExtentForChild(child) + crossAxisMarginExtentForChild(child); |
| if (!isColumnFlow()) |
| setLogicalHeight(std::max(logicalHeight(), crossAxisOffset + flowAwareBorderAfter() + flowAwarePaddingAfter() + childCrossAxisMarginBoxExtent + crossAxisScrollbarExtent())); |
| maxChildCrossAxisExtent = std::max(maxChildCrossAxisExtent, childCrossAxisMarginBoxExtent); |
| |
| mainAxisOffset += flowAwareMarginStartForChild(child); |
| |
| LayoutUnit childMainExtent = mainAxisExtentForChild(child); |
| LayoutPoint childLocation(shouldFlipMainAxis ? totalMainExtent - mainAxisOffset - childMainExtent : mainAxisOffset, |
| crossAxisOffset + flowAwareMarginBeforeForChild(child)); |
| |
| // FIXME: Supporting layout deltas. |
| setFlowAwareLocationForChild(child, childLocation); |
| mainAxisOffset += childMainExtent + flowAwareMarginEndForChild(child); |
| |
| ++seenInFlowPositionedChildren; |
| if (seenInFlowPositionedChildren < numberOfChildrenForJustifyContent) |
| mainAxisOffset += justifyContentSpaceBetweenChildren(availableFreeSpace, style().justifyContent(), numberOfChildrenForJustifyContent); |
| } |
| |
| if (isColumnFlow()) |
| setLogicalHeight(mainAxisOffset + flowAwareBorderEnd() + flowAwarePaddingEnd() + scrollbarLogicalHeight()); |
| |
| if (style().flexDirection() == FlowColumnReverse) { |
| // We have to do an extra pass for column-reverse to reposition the flex items since the start depends |
| // on the height of the flexbox, which we only know after we've positioned all the flex items. |
| updateLogicalHeight(); |
| layoutColumnReverse(children, crossAxisOffset, availableFreeSpace); |
| } |
| |
| if (m_numberOfInFlowChildrenOnFirstLine == -1) |
| m_numberOfInFlowChildrenOnFirstLine = seenInFlowPositionedChildren; |
| lineContexts.append(LineContext(crossAxisOffset, maxChildCrossAxisExtent, children.size(), maxAscent)); |
| crossAxisOffset += maxChildCrossAxisExtent; |
| } |
| |
| void RenderFlexibleBox::layoutColumnReverse(const OrderedFlexItemList& children, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace) |
| { |
| // This is similar to the logic in layoutAndPlaceChildren, except we place the children |
| // starting from the end of the flexbox. We also don't need to layout anything since we're |
| // just moving the children to a new position. |
| size_t numberOfChildrenForJustifyContent = numberOfInFlowPositionedChildren(children); |
| LayoutUnit mainAxisOffset = logicalHeight() - flowAwareBorderEnd() - flowAwarePaddingEnd(); |
| mainAxisOffset -= initialJustifyContentOffset(availableFreeSpace, style().justifyContent(), numberOfChildrenForJustifyContent); |
| mainAxisOffset -= isHorizontalFlow() ? verticalScrollbarWidth() : horizontalScrollbarHeight(); |
| |
| size_t seenInFlowPositionedChildren = 0; |
| for (size_t i = 0; i < children.size(); ++i) { |
| RenderBox& child = *children[i]; |
| if (child.isOutOfFlowPositioned()) { |
| child.layer()->setStaticBlockPosition(mainAxisOffset); |
| continue; |
| } |
| mainAxisOffset -= mainAxisExtentForChild(child) + flowAwareMarginEndForChild(child); |
| |
| setFlowAwareLocationForChild(child, LayoutPoint(mainAxisOffset, crossAxisOffset + flowAwareMarginBeforeForChild(child))); |
| |
| mainAxisOffset -= flowAwareMarginStartForChild(child); |
| |
| ++seenInFlowPositionedChildren; |
| if (seenInFlowPositionedChildren < numberOfChildrenForJustifyContent) |
| mainAxisOffset -= justifyContentSpaceBetweenChildren(availableFreeSpace, style().justifyContent(), numberOfChildrenForJustifyContent); |
| } |
| } |
| |
| static LayoutUnit initialAlignContentOffset(LayoutUnit availableFreeSpace, EAlignContent alignContent, unsigned numberOfLines) |
| { |
| if (alignContent == AlignContentFlexEnd) |
| return availableFreeSpace; |
| if (alignContent == AlignContentCenter) |
| return availableFreeSpace / 2; |
| if (alignContent == AlignContentSpaceAround) { |
| if (availableFreeSpace > 0 && numberOfLines) |
| return availableFreeSpace / (2 * numberOfLines); |
| if (availableFreeSpace < 0) |
| return availableFreeSpace / 2; |
| } |
| return 0; |
| } |
| |
| static LayoutUnit alignContentSpaceBetweenChildren(LayoutUnit availableFreeSpace, EAlignContent alignContent, unsigned numberOfLines) |
| { |
| if (availableFreeSpace > 0 && numberOfLines > 1) { |
| if (alignContent == AlignContentSpaceBetween) |
| return availableFreeSpace / (numberOfLines - 1); |
| if (alignContent == AlignContentSpaceAround || alignContent == AlignContentStretch) |
| return availableFreeSpace / numberOfLines; |
| } |
| return 0; |
| } |
| |
| void RenderFlexibleBox::alignFlexLines(Vector<LineContext>& lineContexts) |
| { |
| if (!isMultiline() || style().alignContent() == AlignContentFlexStart) |
| return; |
| |
| LayoutUnit availableCrossAxisSpace = crossAxisContentExtent(); |
| for (size_t i = 0; i < lineContexts.size(); ++i) |
| availableCrossAxisSpace -= lineContexts[i].crossAxisExtent; |
| |
| RenderBox* child = m_orderIterator.first(); |
| LayoutUnit lineOffset = initialAlignContentOffset(availableCrossAxisSpace, style().alignContent(), lineContexts.size()); |
| for (unsigned lineNumber = 0; lineNumber < lineContexts.size(); ++lineNumber) { |
| lineContexts[lineNumber].crossAxisOffset += lineOffset; |
| for (size_t childNumber = 0; childNumber < lineContexts[lineNumber].numberOfChildren; ++childNumber, child = m_orderIterator.next()) |
| adjustAlignmentForChild(*child, lineOffset); |
| |
| if (style().alignContent() == AlignContentStretch && availableCrossAxisSpace > 0) |
| lineContexts[lineNumber].crossAxisExtent += availableCrossAxisSpace / static_cast<unsigned>(lineContexts.size()); |
| |
| lineOffset += alignContentSpaceBetweenChildren(availableCrossAxisSpace, style().alignContent(), lineContexts.size()); |
| } |
| } |
| |
| void RenderFlexibleBox::adjustAlignmentForChild(RenderBox& child, LayoutUnit delta) |
| { |
| if (child.isOutOfFlowPositioned()) { |
| LayoutUnit staticInlinePosition = child.layer()->staticInlinePosition(); |
| LayoutUnit staticBlockPosition = child.layer()->staticBlockPosition(); |
| LayoutUnit mainAxis = isColumnFlow() ? staticBlockPosition : staticInlinePosition; |
| LayoutUnit crossAxis = isColumnFlow() ? staticInlinePosition : staticBlockPosition; |
| crossAxis += delta; |
| prepareChildForPositionedLayout(child, mainAxis, crossAxis, NoFlipForRowReverse); |
| return; |
| } |
| |
| setFlowAwareLocationForChild(child, flowAwareLocationForChild(child) + LayoutSize(0, delta)); |
| } |
| |
| void RenderFlexibleBox::alignChildren(const Vector<LineContext>& lineContexts) |
| { |
| // Keep track of the space between the baseline edge and the after edge of the box for each line. |
| Vector<LayoutUnit> minMarginAfterBaselines; |
| |
| RenderBox* child = m_orderIterator.first(); |
| for (size_t lineNumber = 0; lineNumber < lineContexts.size(); ++lineNumber) { |
| LayoutUnit minMarginAfterBaseline = LayoutUnit::max(); |
| LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent; |
| LayoutUnit maxAscent = lineContexts[lineNumber].maxAscent; |
| |
| for (size_t childNumber = 0; childNumber < lineContexts[lineNumber].numberOfChildren; ++childNumber, child = m_orderIterator.next()) { |
| ASSERT(child); |
| if (child->isOutOfFlowPositioned()) { |
| if (style().flexWrap() == FlexWrapReverse) |
| adjustAlignmentForChild(*child, lineCrossAxisExtent); |
| continue; |
| } |
| |
| if (updateAutoMarginsInCrossAxis(*child, std::max(LayoutUnit(0), availableAlignmentSpaceForChild(lineCrossAxisExtent, *child)))) |
| continue; |
| |
| switch (alignmentForChild(*child)) { |
| case AlignAuto: |
| ASSERT_NOT_REACHED(); |
| break; |
| case AlignStretch: { |
| applyStretchAlignmentToChild(*child, lineCrossAxisExtent); |
| // Since wrap-reverse flips cross start and cross end, strech children should be aligned with the cross end. |
| if (style().flexWrap() == FlexWrapReverse) |
| adjustAlignmentForChild(*child, availableAlignmentSpaceForChild(lineCrossAxisExtent, *child)); |
| break; |
| } |
| case AlignFlexStart: |
| break; |
| case AlignFlexEnd: |
| adjustAlignmentForChild(*child, availableAlignmentSpaceForChild(lineCrossAxisExtent, *child)); |
| break; |
| case AlignCenter: |
| adjustAlignmentForChild(*child, availableAlignmentSpaceForChild(lineCrossAxisExtent, *child) / 2); |
| break; |
| case AlignBaseline: { |
| // FIXME: If we get here in columns, we want the use the descent, except we currently can't get the ascent/descent of orthogonal children. |
| // https://bugs.webkit.org/show_bug.cgi?id=98076 |
| LayoutUnit ascent = marginBoxAscentForChild(*child); |
| LayoutUnit startOffset = maxAscent - ascent; |
| adjustAlignmentForChild(*child, startOffset); |
| |
| if (style().flexWrap() == FlexWrapReverse) |
| minMarginAfterBaseline = std::min(minMarginAfterBaseline, availableAlignmentSpaceForChild(lineCrossAxisExtent, *child) - startOffset); |
| break; |
| } |
| } |
| } |
| minMarginAfterBaselines.append(minMarginAfterBaseline); |
| } |
| |
| if (style().flexWrap() != FlexWrapReverse) |
| return; |
| |
| // wrap-reverse flips the cross axis start and end. For baseline alignment, this means we |
| // need to align the after edge of baseline elements with the after edge of the flex line. |
| child = m_orderIterator.first(); |
| for (size_t lineNumber = 0; lineNumber < lineContexts.size(); ++lineNumber) { |
| LayoutUnit minMarginAfterBaseline = minMarginAfterBaselines[lineNumber]; |
| for (size_t childNumber = 0; childNumber < lineContexts[lineNumber].numberOfChildren; ++childNumber, child = m_orderIterator.next()) { |
| ASSERT(child); |
| if (alignmentForChild(*child) == AlignBaseline && !hasAutoMarginsInCrossAxis(*child) && minMarginAfterBaseline) |
| adjustAlignmentForChild(*child, minMarginAfterBaseline); |
| } |
| } |
| } |
| |
| void RenderFlexibleBox::applyStretchAlignmentToChild(RenderBox& child, LayoutUnit lineCrossAxisExtent) |
| { |
| if (!isColumnFlow() && child.style().logicalHeight().isAuto()) { |
| // FIXME: If the child has orthogonal flow, then it already has an override height set, so use it. |
| if (!hasOrthogonalFlow(child)) { |
| LayoutUnit stretchedLogicalHeight = child.logicalHeight() + availableAlignmentSpaceForChild(lineCrossAxisExtent, child); |
| LayoutUnit desiredLogicalHeight = child.constrainLogicalHeightByMinMax(stretchedLogicalHeight); |
| |
| // FIXME: Can avoid laying out here in some cases. See https://webkit.org/b/87905. |
| if (desiredLogicalHeight != child.logicalHeight()) { |
| child.setOverrideLogicalContentHeight(desiredLogicalHeight - child.borderAndPaddingLogicalHeight()); |
| child.setLogicalHeight(0); |
| child.setChildNeedsLayout(MarkOnlyThis); |
| child.layout(); |
| } |
| } |
| } else if (isColumnFlow() && child.style().logicalWidth().isAuto()) { |
| // FIXME: If the child doesn't have orthogonal flow, then it already has an override width set, so use it. |
| if (hasOrthogonalFlow(child)) { |
| LayoutUnit childWidth = std::max<LayoutUnit>(0, lineCrossAxisExtent - crossAxisMarginExtentForChild(child)); |
| childWidth = child.constrainLogicalWidthInRegionByMinMax(childWidth, childWidth, this); |
| |
| if (childWidth != child.logicalWidth()) { |
| child.setOverrideLogicalContentWidth(childWidth - child.borderAndPaddingLogicalWidth()); |
| child.setChildNeedsLayout(MarkOnlyThis); |
| child.layout(); |
| } |
| } |
| } |
| } |
| |
| void RenderFlexibleBox::flipForRightToLeftColumn() |
| { |
| if (style().isLeftToRightDirection() || !isColumnFlow()) |
| return; |
| |
| LayoutUnit crossExtent = crossAxisExtent(); |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| if (child->isOutOfFlowPositioned()) |
| continue; |
| LayoutPoint location = flowAwareLocationForChild(*child); |
| location.setY(crossExtent - crossAxisExtentForChild(*child) - location.y()); |
| setFlowAwareLocationForChild(*child, location); |
| } |
| } |
| |
| void RenderFlexibleBox::flipForWrapReverse(const Vector<LineContext>& lineContexts, LayoutUnit crossAxisStartEdge) |
| { |
| LayoutUnit contentExtent = crossAxisContentExtent(); |
| RenderBox* child = m_orderIterator.first(); |
| for (size_t lineNumber = 0; lineNumber < lineContexts.size(); ++lineNumber) { |
| for (size_t childNumber = 0; childNumber < lineContexts[lineNumber].numberOfChildren; ++childNumber, child = m_orderIterator.next()) { |
| ASSERT(child); |
| LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent; |
| LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge; |
| LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent; |
| adjustAlignmentForChild(*child, newOffset - originalOffset); |
| } |
| } |
| } |
| |
| } |
