| /* |
| * Copyright (C) 2011 Apple 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: |
| * 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 APPLE INC. ``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 APPLE COMPUTER, INC. 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 "core/rendering/RenderGrid.h" |
| |
| #include "core/rendering/LayoutRepainter.h" |
| #include "core/rendering/RenderLayer.h" |
| #include "core/rendering/RenderView.h" |
| #include "core/rendering/style/GridCoordinate.h" |
| |
| namespace WebCore { |
| |
| static const int infinity = -1; |
| |
| class GridTrack { |
| public: |
| GridTrack() |
| : m_usedBreadth(0) |
| , m_maxBreadth(0) |
| { |
| } |
| |
| void growUsedBreadth(LayoutUnit growth) |
| { |
| ASSERT(growth >= 0); |
| m_usedBreadth += growth; |
| } |
| LayoutUnit usedBreadth() const { return m_usedBreadth; } |
| |
| void growMaxBreadth(LayoutUnit growth) |
| { |
| if (m_maxBreadth == infinity) |
| m_maxBreadth = m_usedBreadth + growth; |
| else |
| m_maxBreadth += growth; |
| } |
| LayoutUnit maxBreadthIfNotInfinite() const |
| { |
| return (m_maxBreadth == infinity) ? m_usedBreadth : m_maxBreadth; |
| } |
| |
| LayoutUnit m_usedBreadth; |
| LayoutUnit m_maxBreadth; |
| }; |
| |
| struct GridTrackForNormalization { |
| GridTrackForNormalization(const GridTrack& track, double flex) |
| : m_track(&track) |
| , m_flex(flex) |
| , m_normalizedFlexValue(track.m_usedBreadth / flex) |
| { |
| } |
| |
| // Required by std::sort. |
| GridTrackForNormalization operator=(const GridTrackForNormalization& o) |
| { |
| m_track = o.m_track; |
| m_flex = o.m_flex; |
| m_normalizedFlexValue = o.m_normalizedFlexValue; |
| return *this; |
| } |
| |
| const GridTrack* m_track; |
| double m_flex; |
| LayoutUnit m_normalizedFlexValue; |
| }; |
| |
| class RenderGrid::GridIterator { |
| WTF_MAKE_NONCOPYABLE(GridIterator); |
| public: |
| // |direction| is the direction that is fixed to |fixedTrackIndex| so e.g |
| // GridIterator(m_grid, ForColumns, 1) will walk over the rows of the 2nd column. |
| GridIterator(const Vector<Vector<Vector<RenderBox*, 1> > >& grid, TrackSizingDirection direction, size_t fixedTrackIndex) |
| : m_grid(grid) |
| , m_direction(direction) |
| , m_rowIndex((direction == ForColumns) ? 0 : fixedTrackIndex) |
| , m_columnIndex((direction == ForColumns) ? fixedTrackIndex : 0) |
| , m_childIndex(0) |
| { |
| ASSERT(m_rowIndex < m_grid.size()); |
| ASSERT(m_columnIndex < m_grid[0].size()); |
| } |
| |
| RenderBox* nextGridItem() |
| { |
| if (!m_grid.size()) |
| return 0; |
| |
| size_t& varyingTrackIndex = (m_direction == ForColumns) ? m_rowIndex : m_columnIndex; |
| const size_t endOfVaryingTrackIndex = (m_direction == ForColumns) ? m_grid.size() : m_grid[0].size(); |
| for (; varyingTrackIndex < endOfVaryingTrackIndex; ++varyingTrackIndex) { |
| const Vector<RenderBox*>& children = m_grid[m_rowIndex][m_columnIndex]; |
| if (m_childIndex < children.size()) |
| return children[m_childIndex++]; |
| |
| m_childIndex = 0; |
| } |
| return 0; |
| } |
| |
| PassOwnPtr<GridCoordinate> nextEmptyGridArea() |
| { |
| if (m_grid.isEmpty()) |
| return nullptr; |
| |
| size_t& varyingTrackIndex = (m_direction == ForColumns) ? m_rowIndex : m_columnIndex; |
| const size_t endOfVaryingTrackIndex = (m_direction == ForColumns) ? m_grid.size() : m_grid[0].size(); |
| for (; varyingTrackIndex < endOfVaryingTrackIndex; ++varyingTrackIndex) { |
| const Vector<RenderBox*>& children = m_grid[m_rowIndex][m_columnIndex]; |
| if (children.isEmpty()) { |
| OwnPtr<GridCoordinate> result = adoptPtr(new GridCoordinate(GridSpan(m_rowIndex, m_rowIndex), GridSpan(m_columnIndex, m_columnIndex))); |
| // Advance the iterator to avoid an infinite loop where we would return the same grid area over and over. |
| ++varyingTrackIndex; |
| return result.release(); |
| } |
| } |
| return nullptr; |
| } |
| |
| private: |
| const Vector<Vector<Vector<RenderBox*, 1> > >& m_grid; |
| TrackSizingDirection m_direction; |
| size_t m_rowIndex; |
| size_t m_columnIndex; |
| size_t m_childIndex; |
| }; |
| |
| RenderGrid::RenderGrid(Element* element) |
| : RenderBlock(element) |
| , m_gridIsDirty(true) |
| , m_orderIterator(this) |
| { |
| // All of our children must be block level. |
| setChildrenInline(false); |
| } |
| |
| RenderGrid::~RenderGrid() |
| { |
| } |
| |
| void RenderGrid::addChild(RenderObject* newChild, RenderObject* beforeChild) |
| { |
| RenderBlock::addChild(newChild, beforeChild); |
| |
| if (gridIsDirty()) |
| return; |
| |
| RenderBox* newChildBox = toRenderBox(newChild); |
| OwnPtr<GridSpan> rowPositions = resolveGridPositionsFromStyle(newChildBox, ForRows); |
| OwnPtr<GridSpan> columnPositions = resolveGridPositionsFromStyle(newChildBox, ForColumns); |
| if (!rowPositions || !columnPositions) { |
| // The new child requires the auto-placement algorithm to run so we need to recompute the grid fully. |
| dirtyGrid(); |
| } else { |
| if (gridRowCount() <= rowPositions->finalPositionIndex || gridColumnCount() <= columnPositions->finalPositionIndex) { |
| // FIXME: We could just insert the new child provided we had a primitive to arbitrarily grow the grid. |
| dirtyGrid(); |
| } else { |
| insertItemIntoGrid(newChildBox, GridCoordinate(*rowPositions, *columnPositions)); |
| } |
| } |
| } |
| |
| void RenderGrid::removeChild(RenderObject* child) |
| { |
| RenderBlock::removeChild(child); |
| |
| if (gridIsDirty()) |
| return; |
| |
| ASSERT(child->isBox()); |
| // FIXME: We could avoid dirtying the grid in some cases (e.g. if it's an explicitly positioned element). |
| dirtyGrid(); |
| } |
| |
| void RenderGrid::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| RenderBlock::styleDidChange(diff, oldStyle); |
| if (!oldStyle) |
| return; |
| |
| // FIXME: The following checks could be narrowed down if we kept track of which type of grid items we have: |
| // - explicit grid size changes impact negative explicitely positioned and auto-placed grid items. |
| // - named grid lines only impact grid items with named grid lines. |
| // - auto-flow changes only impacts auto-placed children. |
| |
| if (explicitGridDidResize(oldStyle) |
| || namedGridLinesDefinitionDidChange(oldStyle) |
| || oldStyle->gridAutoFlow() != style()->gridAutoFlow()) |
| dirtyGrid(); |
| } |
| |
| bool RenderGrid::explicitGridDidResize(const RenderStyle* oldStyle) const |
| { |
| return oldStyle->gridDefinitionColumns().size() != style()->gridDefinitionColumns().size() |
| || oldStyle->gridDefinitionRows().size() != style()->gridDefinitionRows().size(); |
| } |
| |
| bool RenderGrid::namedGridLinesDefinitionDidChange(const RenderStyle* oldStyle) const |
| { |
| return oldStyle->namedGridRowLines() != style()->namedGridRowLines() |
| || oldStyle->namedGridColumnLines() != style()->namedGridColumnLines(); |
| } |
| |
| void RenderGrid::layoutBlock(bool relayoutChildren, LayoutUnit) |
| { |
| ASSERT(needsLayout()); |
| |
| if (!relayoutChildren && simplifiedLayout()) |
| return; |
| |
| // FIXME: Much of this method is boiler plate that matches RenderBox::layoutBlock and Render*FlexibleBox::layoutBlock. |
| // It would be nice to refactor some of the duplicate code. |
| LayoutRepainter repainter(*this, checkForRepaintDuringLayout()); |
| LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode()); |
| |
| // Regions changing widths can force us to relayout our children. |
| RenderFlowThread* flowThread = flowThreadContainingBlock(); |
| if (logicalWidthChangedInRegions(flowThread)) |
| relayoutChildren = true; |
| if (updateRegionsAndShapesLogicalSize(flowThread)) |
| relayoutChildren = true; |
| |
| LayoutSize previousSize = size(); |
| |
| setLogicalHeight(0); |
| updateLogicalWidth(); |
| |
| layoutGridItems(); |
| |
| LayoutUnit oldClientAfterEdge = clientLogicalBottom(); |
| updateLogicalHeight(); |
| |
| if (size() != previousSize) |
| relayoutChildren = true; |
| |
| layoutPositionedObjects(relayoutChildren || isRoot()); |
| |
| computeRegionRangeForBlock(flowThread); |
| |
| computeOverflow(oldClientAfterEdge); |
| statePusher.pop(); |
| |
| updateLayerTransform(); |
| |
| // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if |
| // we overflow or not. |
| if (hasOverflowClip()) |
| layer()->updateScrollInfoAfterLayout(); |
| |
| repainter.repaintAfterLayout(); |
| |
| clearNeedsLayout(); |
| } |
| |
| void RenderGrid::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const |
| { |
| const_cast<RenderGrid*>(this)->placeItemsOnGrid(); |
| |
| // FIXME: This is an inefficient way to fill our sizes as it will try every grid areas, when we would |
| // only want to account for fixed grid tracks and grid items. Also this will be incorrect if we have spanning |
| // grid items. |
| for (size_t i = 0; i < gridColumnCount(); ++i) { |
| const GridTrackSize& trackSize = gridTrackSize(ForColumns, i); |
| LayoutUnit minTrackBreadth = computePreferredTrackWidth(trackSize.minTrackBreadth(), i); |
| LayoutUnit maxTrackBreadth = computePreferredTrackWidth(trackSize.maxTrackBreadth(), i); |
| maxTrackBreadth = std::max(maxTrackBreadth, minTrackBreadth); |
| |
| minLogicalWidth += minTrackBreadth; |
| maxLogicalWidth += maxTrackBreadth; |
| |
| // FIXME: This should add in the scrollbarWidth (e.g. see RenderFlexibleBox). |
| } |
| } |
| |
| void RenderGrid::computePreferredLogicalWidths() |
| { |
| ASSERT(preferredLogicalWidthsDirty()); |
| |
| m_minPreferredLogicalWidth = 0; |
| m_maxPreferredLogicalWidth = 0; |
| |
| // FIXME: We don't take our own logical width into account. Once we do, we need to make sure |
| // we apply (and test the interaction with) min-width / max-width. |
| |
| computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth); |
| |
| LayoutUnit borderAndPaddingInInlineDirection = borderAndPaddingLogicalWidth(); |
| m_minPreferredLogicalWidth += borderAndPaddingInInlineDirection; |
| m_maxPreferredLogicalWidth += borderAndPaddingInInlineDirection; |
| |
| setPreferredLogicalWidthsDirty(false); |
| } |
| |
| LayoutUnit RenderGrid::computePreferredTrackWidth(const GridLength& gridLength, size_t trackIndex) const |
| { |
| if (gridLength.isFlex()) |
| return 0; |
| |
| const Length& length = gridLength.length(); |
| |
| if (length.isFixed()) { |
| // Grid areas don't have borders, margins or paddings so we don't need to account for them. |
| return length.intValue(); |
| } |
| |
| if (length.isMinContent()) { |
| LayoutUnit minContentSize = 0; |
| GridIterator iterator(m_grid, ForColumns, trackIndex); |
| while (RenderBox* gridItem = iterator.nextGridItem()) { |
| // FIXME: We should include the child's fixed margins like RenderFlexibleBox. |
| minContentSize = std::max(minContentSize, gridItem->minPreferredLogicalWidth()); |
| } |
| return minContentSize; |
| } |
| |
| if (length.isMaxContent()) { |
| LayoutUnit maxContentSize = 0; |
| GridIterator iterator(m_grid, ForColumns, trackIndex); |
| while (RenderBox* gridItem = iterator.nextGridItem()) { |
| // FIXME: We should include the child's fixed margins like RenderFlexibleBox. |
| maxContentSize = std::max(maxContentSize, gridItem->maxPreferredLogicalWidth()); |
| } |
| return maxContentSize; |
| } |
| |
| // FIXME: css3-sizing mentions that we should resolve "definite sizes" |
| // (including <percentage> and calc()) but we don't do it elsewhere. |
| return 0; |
| } |
| |
| void RenderGrid::computedUsedBreadthOfGridTracks(TrackSizingDirection direction, Vector<GridTrack>& columnTracks, Vector<GridTrack>& rowTracks) |
| { |
| LayoutUnit availableLogicalSpace = (direction == ForColumns) ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); |
| Vector<GridTrack>& tracks = (direction == ForColumns) ? columnTracks : rowTracks; |
| for (size_t i = 0; i < tracks.size(); ++i) { |
| GridTrack& track = tracks[i]; |
| const GridTrackSize& trackSize = gridTrackSize(direction, i); |
| const GridLength& minTrackBreadth = trackSize.minTrackBreadth(); |
| const GridLength& maxTrackBreadth = trackSize.maxTrackBreadth(); |
| |
| track.m_usedBreadth = computeUsedBreadthOfMinLength(direction, minTrackBreadth); |
| track.m_maxBreadth = computeUsedBreadthOfMaxLength(direction, maxTrackBreadth, track.m_usedBreadth); |
| |
| track.m_maxBreadth = std::max(track.m_maxBreadth, track.m_usedBreadth); |
| } |
| |
| // FIXME: We shouldn't call resolveContentBasedTrackSizingFunctions if we have no min-content / max-content tracks. |
| resolveContentBasedTrackSizingFunctions(direction, columnTracks, rowTracks, availableLogicalSpace); |
| |
| if (availableLogicalSpace <= 0) |
| return; |
| |
| const size_t tracksSize = tracks.size(); |
| Vector<GridTrack*> tracksForDistribution(tracksSize); |
| for (size_t i = 0; i < tracksSize; ++i) |
| tracksForDistribution[i] = tracks.data() + i; |
| |
| distributeSpaceToTracks(tracksForDistribution, 0, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth, availableLogicalSpace); |
| |
| // 4. Grow all Grid tracks having a fraction as the MaxTrackSizingFunction. |
| |
| // FIXME: Handle the case where RemainingSpace is not defined. |
| double normalizedFractionBreadth = computeNormalizedFractionBreadth(tracks, direction, availableLogicalSpace); |
| for (size_t i = 0; i < tracksSize; ++i) { |
| const GridTrackSize& trackSize = gridTrackSize(direction, i); |
| if (!trackSize.maxTrackBreadth().isFlex()) |
| continue; |
| |
| tracks[i].m_usedBreadth = std::max<LayoutUnit>(tracks[i].m_usedBreadth, normalizedFractionBreadth * trackSize.maxTrackBreadth().flex()); |
| } |
| } |
| |
| LayoutUnit RenderGrid::computeUsedBreadthOfMinLength(TrackSizingDirection direction, const GridLength& gridLength) const |
| { |
| if (gridLength.isFlex()) |
| return 0; |
| |
| const Length& trackLength = gridLength.length(); |
| ASSERT(!trackLength.isAuto()); |
| if (trackLength.isFixed() || trackLength.isPercent() || trackLength.isViewportPercentage()) |
| return computeUsedBreadthOfSpecifiedLength(direction, trackLength); |
| |
| ASSERT(trackLength.isMinContent() || trackLength.isMaxContent()); |
| return 0; |
| } |
| |
| LayoutUnit RenderGrid::computeUsedBreadthOfMaxLength(TrackSizingDirection direction, const GridLength& gridLength, LayoutUnit usedBreadth) const |
| { |
| if (gridLength.isFlex()) |
| return usedBreadth; |
| |
| const Length& trackLength = gridLength.length(); |
| ASSERT(!trackLength.isAuto()); |
| if (trackLength.isFixed() || trackLength.isPercent() || trackLength.isViewportPercentage()) { |
| LayoutUnit computedBreadth = computeUsedBreadthOfSpecifiedLength(direction, trackLength); |
| ASSERT(computedBreadth != infinity); |
| return computedBreadth; |
| } |
| |
| ASSERT(trackLength.isMinContent() || trackLength.isMaxContent()); |
| return infinity; |
| } |
| |
| LayoutUnit RenderGrid::computeUsedBreadthOfSpecifiedLength(TrackSizingDirection direction, const Length& trackLength) const |
| { |
| // FIXME: We still need to support calc() here (https://webkit.org/b/103761). |
| ASSERT(trackLength.isFixed() || trackLength.isPercent() || trackLength.isViewportPercentage()); |
| // FIXME: The -1 here should be replaced by whatever the intrinsic height of the grid is. |
| return valueForLength(trackLength, direction == ForColumns ? logicalWidth() : computeContentLogicalHeight(style()->logicalHeight(), -1), view()); |
| } |
| |
| static bool sortByGridNormalizedFlexValue(const GridTrackForNormalization& track1, const GridTrackForNormalization& track2) |
| { |
| return track1.m_normalizedFlexValue < track2.m_normalizedFlexValue; |
| } |
| |
| double RenderGrid::computeNormalizedFractionBreadth(Vector<GridTrack>& tracks, TrackSizingDirection direction, LayoutUnit availableLogicalSpace) const |
| { |
| // |availableLogicalSpace| already accounts for the used breadths so no need to remove it here. |
| |
| Vector<GridTrackForNormalization> tracksForNormalization; |
| for (size_t i = 0; i < tracks.size(); ++i) { |
| const GridTrackSize& trackSize = gridTrackSize(direction, i); |
| if (!trackSize.maxTrackBreadth().isFlex()) |
| continue; |
| |
| tracksForNormalization.append(GridTrackForNormalization(tracks[i], trackSize.maxTrackBreadth().flex())); |
| } |
| |
| // FIXME: Ideally we shouldn't come here without any <flex> grid track. |
| if (tracksForNormalization.isEmpty()) |
| return LayoutUnit(); |
| |
| std::sort(tracksForNormalization.begin(), tracksForNormalization.end(), sortByGridNormalizedFlexValue); |
| |
| // These values work together: as we walk over our grid tracks, we increase fractionValueBasedOnGridItemsRatio |
| // to match a grid track's usedBreadth to <flex> ratio until the total fractions sized grid tracks wouldn't |
| // fit into availableLogicalSpaceIgnoringFractionTracks. |
| double accumulatedFractions = 0; |
| LayoutUnit fractionValueBasedOnGridItemsRatio = 0; |
| LayoutUnit availableLogicalSpaceIgnoringFractionTracks = availableLogicalSpace; |
| |
| for (size_t i = 0; i < tracksForNormalization.size(); ++i) { |
| const GridTrackForNormalization& track = tracksForNormalization[i]; |
| if (track.m_normalizedFlexValue > fractionValueBasedOnGridItemsRatio) { |
| // If the normalized flex value (we ordered |tracksForNormalization| by increasing normalized flex value) |
| // will make us overflow our container, then stop. We have the previous step's ratio is the best fit. |
| if (track.m_normalizedFlexValue * accumulatedFractions > availableLogicalSpaceIgnoringFractionTracks) |
| break; |
| |
| fractionValueBasedOnGridItemsRatio = track.m_normalizedFlexValue; |
| } |
| |
| accumulatedFractions += track.m_flex; |
| // This item was processed so we re-add its used breadth to the available space to accurately count the remaining space. |
| availableLogicalSpaceIgnoringFractionTracks += track.m_track->m_usedBreadth; |
| } |
| |
| return availableLogicalSpaceIgnoringFractionTracks / accumulatedFractions; |
| } |
| |
| const GridTrackSize& RenderGrid::gridTrackSize(TrackSizingDirection direction, size_t i) const |
| { |
| const Vector<GridTrackSize>& trackStyles = (direction == ForColumns) ? style()->gridDefinitionColumns() : style()->gridDefinitionRows(); |
| if (i >= trackStyles.size()) |
| return (direction == ForColumns) ? style()->gridAutoColumns() : style()->gridAutoRows(); |
| |
| return trackStyles[i]; |
| } |
| |
| size_t RenderGrid::explicitGridColumnCount() const |
| { |
| return style()->gridDefinitionColumns().size(); |
| } |
| |
| size_t RenderGrid::explicitGridRowCount() const |
| { |
| return style()->gridDefinitionRows().size(); |
| } |
| |
| size_t RenderGrid::explicitGridSizeForSide(GridPositionSide side) const |
| { |
| return (side == ColumnStartSide || side == ColumnEndSide) ? explicitGridColumnCount() : explicitGridRowCount(); |
| } |
| |
| LayoutUnit RenderGrid::logicalContentHeightForChild(RenderBox* child, Vector<GridTrack>& columnTracks) |
| { |
| // FIXME: We shouldn't force a layout every time this function is called but |
| // 1) Return computeLogicalHeight's value if it's available. Unfortunately computeLogicalHeight |
| // doesn't return if the logical height is available so would need to be changed. |
| // 2) Relayout if the column track's used breadth changed OR the logical height is unavailable. |
| if (!child->needsLayout()) |
| child->setNeedsLayout(true, MarkOnlyThis); |
| |
| child->setOverrideContainingBlockContentLogicalWidth(gridAreaBreadthForChild(child, ForColumns, columnTracks)); |
| // If |child| has a percentage logical height, we shouldn't let it override its intrinsic height, which is |
| // what we are interested in here. Thus we need to set the override logical height to -1 (no possible resolution). |
| child->setOverrideContainingBlockContentLogicalHeight(-1); |
| child->layout(); |
| return child->logicalHeight(); |
| } |
| |
| LayoutUnit RenderGrid::minContentForChild(RenderBox* child, TrackSizingDirection direction, Vector<GridTrack>& columnTracks) |
| { |
| bool hasOrthogonalWritingMode = child->isHorizontalWritingMode() != isHorizontalWritingMode(); |
| // FIXME: Properly support orthogonal writing mode. |
| if (hasOrthogonalWritingMode) |
| return 0; |
| |
| if (direction == ForColumns) { |
| // FIXME: It's unclear if we should return the intrinsic width or the preferred width. |
| // See http://lists.w3.org/Archives/Public/www-style/2013Jan/0245.html |
| return child->minPreferredLogicalWidth(); |
| } |
| |
| return logicalContentHeightForChild(child, columnTracks); |
| } |
| |
| LayoutUnit RenderGrid::maxContentForChild(RenderBox* child, TrackSizingDirection direction, Vector<GridTrack>& columnTracks) |
| { |
| bool hasOrthogonalWritingMode = child->isHorizontalWritingMode() != isHorizontalWritingMode(); |
| // FIXME: Properly support orthogonal writing mode. |
| if (hasOrthogonalWritingMode) |
| return LayoutUnit(); |
| |
| if (direction == ForColumns) { |
| // FIXME: It's unclear if we should return the intrinsic width or the preferred width. |
| // See http://lists.w3.org/Archives/Public/www-style/2013Jan/0245.html |
| return child->maxPreferredLogicalWidth(); |
| } |
| |
| return logicalContentHeightForChild(child, columnTracks); |
| } |
| |
| void RenderGrid::resolveContentBasedTrackSizingFunctions(TrackSizingDirection direction, Vector<GridTrack>& columnTracks, Vector<GridTrack>& rowTracks, LayoutUnit& availableLogicalSpace) |
| { |
| // FIXME: Split the grid tracks into groups that doesn't overlap a <flex> grid track (crbug.com/235258). |
| |
| Vector<GridTrack>& tracks = (direction == ForColumns) ? columnTracks : rowTracks; |
| |
| // FIXME: Per step 2 of the specification, we should order the grid items by increasing span. |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| resolveContentBasedTrackSizingFunctionsForItems(direction, columnTracks, rowTracks, child, &GridTrackSize::hasMinOrMaxContentMinTrackBreadth, &RenderGrid::minContentForChild, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth); |
| resolveContentBasedTrackSizingFunctionsForItems(direction, columnTracks, rowTracks, child, &GridTrackSize::hasMaxContentMinTrackBreadth, &RenderGrid::maxContentForChild, &GridTrack::usedBreadth, &GridTrack::growUsedBreadth); |
| resolveContentBasedTrackSizingFunctionsForItems(direction, columnTracks, rowTracks, child, &GridTrackSize::hasMinOrMaxContentMaxTrackBreadth, &RenderGrid::minContentForChild, &GridTrack::maxBreadthIfNotInfinite, &GridTrack::growMaxBreadth); |
| resolveContentBasedTrackSizingFunctionsForItems(direction, columnTracks, rowTracks, child, &GridTrackSize::hasMaxContentMaxTrackBreadth, &RenderGrid::maxContentForChild, &GridTrack::maxBreadthIfNotInfinite, &GridTrack::growMaxBreadth); |
| } |
| |
| for (size_t i = 0; i < tracks.size(); ++i) { |
| GridTrack& track = tracks[i]; |
| if (track.m_maxBreadth == infinity) |
| track.m_maxBreadth = track.m_usedBreadth; |
| |
| availableLogicalSpace -= track.m_usedBreadth; |
| } |
| } |
| |
| void RenderGrid::resolveContentBasedTrackSizingFunctionsForItems(TrackSizingDirection direction, Vector<GridTrack>& columnTracks, Vector<GridTrack>& rowTracks, RenderBox* gridItem, FilterFunction filterFunction, SizingFunction sizingFunction, AccumulatorGetter trackGetter, AccumulatorGrowFunction trackGrowthFunction) |
| { |
| const GridCoordinate coordinate = cachedGridCoordinate(gridItem); |
| const size_t initialTrackIndex = (direction == ForColumns) ? coordinate.columns.initialPositionIndex : coordinate.rows.initialPositionIndex; |
| const size_t finalTrackIndex = (direction == ForColumns) ? coordinate.columns.finalPositionIndex : coordinate.rows.finalPositionIndex; |
| |
| Vector<GridTrack*> tracks; |
| for (size_t trackIndex = initialTrackIndex; trackIndex <= finalTrackIndex; ++trackIndex) { |
| const GridTrackSize& trackSize = gridTrackSize(direction, trackIndex); |
| if (!(trackSize.*filterFunction)()) |
| continue; |
| |
| GridTrack& track = (direction == ForColumns) ? columnTracks[trackIndex] : rowTracks[trackIndex]; |
| tracks.append(&track); |
| } |
| |
| LayoutUnit additionalBreadthSpace = (this->*sizingFunction)(gridItem, direction, columnTracks); |
| for (size_t trackIndexForSpace = initialTrackIndex; trackIndexForSpace <= finalTrackIndex; ++trackIndexForSpace) { |
| GridTrack& track = (direction == ForColumns) ? columnTracks[trackIndexForSpace] : rowTracks[trackIndexForSpace]; |
| additionalBreadthSpace -= (track.*trackGetter)(); |
| } |
| |
| // FIXME: We should pass different values for |tracksForGrowthAboveMaxBreadth|. |
| distributeSpaceToTracks(tracks, &tracks, trackGetter, trackGrowthFunction, additionalBreadthSpace); |
| } |
| |
| static bool sortByGridTrackGrowthPotential(const GridTrack* track1, const GridTrack* track2) |
| { |
| return (track1->m_maxBreadth - track1->m_usedBreadth) < (track2->m_maxBreadth - track2->m_usedBreadth); |
| } |
| |
| void RenderGrid::distributeSpaceToTracks(Vector<GridTrack*>& tracks, Vector<GridTrack*>* tracksForGrowthAboveMaxBreadth, AccumulatorGetter trackGetter, AccumulatorGrowFunction trackGrowthFunction, LayoutUnit& availableLogicalSpace) |
| { |
| std::sort(tracks.begin(), tracks.end(), sortByGridTrackGrowthPotential); |
| |
| size_t tracksSize = tracks.size(); |
| Vector<LayoutUnit> updatedTrackBreadths(tracksSize); |
| |
| for (size_t i = 0; i < tracksSize; ++i) { |
| GridTrack& track = *tracks[i]; |
| LayoutUnit availableLogicalSpaceShare = availableLogicalSpace / (tracksSize - i); |
| LayoutUnit trackBreadth = (tracks[i]->*trackGetter)(); |
| LayoutUnit growthShare = std::max(LayoutUnit(), std::min(availableLogicalSpaceShare, track.m_maxBreadth - trackBreadth)); |
| // We should never shrink any grid track or else we can't guarantee we abide by our min-sizing function. |
| updatedTrackBreadths[i] = trackBreadth + growthShare; |
| availableLogicalSpace -= growthShare; |
| } |
| |
| if (availableLogicalSpace > 0 && tracksForGrowthAboveMaxBreadth) { |
| tracksSize = tracksForGrowthAboveMaxBreadth->size(); |
| for (size_t i = 0; i < tracksSize; ++i) { |
| LayoutUnit growthShare = availableLogicalSpace / (tracksSize - i); |
| updatedTrackBreadths[i] += growthShare; |
| availableLogicalSpace -= growthShare; |
| } |
| } |
| |
| for (size_t i = 0; i < tracksSize; ++i) { |
| LayoutUnit growth = updatedTrackBreadths[i] - (tracks[i]->*trackGetter)(); |
| if (growth >= 0) |
| (tracks[i]->*trackGrowthFunction)(growth); |
| } |
| } |
| |
| #ifndef NDEBUG |
| bool RenderGrid::tracksAreWiderThanMinTrackBreadth(TrackSizingDirection direction, const Vector<GridTrack>& tracks) |
| { |
| for (size_t i = 0; i < tracks.size(); ++i) { |
| const GridTrackSize& trackSize = gridTrackSize(direction, i); |
| const GridLength& minTrackBreadth = trackSize.minTrackBreadth(); |
| if (computeUsedBreadthOfMinLength(direction, minTrackBreadth) > tracks[i].m_usedBreadth) |
| return false; |
| } |
| return true; |
| } |
| #endif |
| |
| void RenderGrid::growGrid(TrackSizingDirection direction) |
| { |
| if (direction == ForColumns) { |
| const size_t oldColumnSize = m_grid[0].size(); |
| for (size_t row = 0; row < m_grid.size(); ++row) |
| m_grid[row].grow(oldColumnSize + 1); |
| } else { |
| const size_t oldRowSize = m_grid.size(); |
| m_grid.grow(oldRowSize + 1); |
| m_grid[oldRowSize].grow(m_grid[0].size()); |
| } |
| } |
| |
| void RenderGrid::insertItemIntoGrid(RenderBox* child, const GridCoordinate& coordinate) |
| { |
| m_grid[coordinate.rows.initialPositionIndex][coordinate.columns.initialPositionIndex].append(child); |
| m_gridItemCoordinate.set(child, coordinate); |
| } |
| |
| void RenderGrid::insertItemIntoGrid(RenderBox* child, size_t rowTrack, size_t columnTrack) |
| { |
| const GridSpan& rowSpan = resolveGridPositionsFromAutoPlacementPosition(child, ForRows, rowTrack); |
| const GridSpan& columnSpan = resolveGridPositionsFromAutoPlacementPosition(child, ForColumns, columnTrack); |
| insertItemIntoGrid(child, GridCoordinate(rowSpan, columnSpan)); |
| } |
| |
| void RenderGrid::placeItemsOnGrid() |
| { |
| if (!gridIsDirty()) |
| return; |
| |
| ASSERT(m_gridItemCoordinate.isEmpty()); |
| |
| populateExplicitGridAndOrderIterator(); |
| |
| // We clear the dirty bit here as the grid sizes have been updated, this means |
| // that we can safely call gridRowCount() / gridColumnCount(). |
| m_gridIsDirty = false; |
| |
| Vector<RenderBox*> autoMajorAxisAutoGridItems; |
| Vector<RenderBox*> specifiedMajorAxisAutoGridItems; |
| GridAutoFlow autoFlow = style()->gridAutoFlow(); |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) { |
| // FIXME: We never re-resolve positions if the grid is grown during auto-placement which may lead auto / <integer> |
| // positions to not match the author's intent. The specification is unclear on what should be done in this case. |
| OwnPtr<GridSpan> rowPositions = resolveGridPositionsFromStyle(child, ForRows); |
| OwnPtr<GridSpan> columnPositions = resolveGridPositionsFromStyle(child, ForColumns); |
| if (!rowPositions || !columnPositions) { |
| GridSpan* majorAxisPositions = (autoPlacementMajorAxisDirection() == ForColumns) ? columnPositions.get() : rowPositions.get(); |
| if (!majorAxisPositions) |
| autoMajorAxisAutoGridItems.append(child); |
| else |
| specifiedMajorAxisAutoGridItems.append(child); |
| continue; |
| } |
| insertItemIntoGrid(child, GridCoordinate(*rowPositions, *columnPositions)); |
| } |
| |
| ASSERT(gridRowCount() >= style()->gridDefinitionRows().size()); |
| ASSERT(gridColumnCount() >= style()->gridDefinitionColumns().size()); |
| |
| if (autoFlow == AutoFlowNone) { |
| // If we did collect some grid items, they won't be placed thus never laid out. |
| ASSERT(!autoMajorAxisAutoGridItems.size()); |
| ASSERT(!specifiedMajorAxisAutoGridItems.size()); |
| return; |
| } |
| |
| placeSpecifiedMajorAxisItemsOnGrid(specifiedMajorAxisAutoGridItems); |
| placeAutoMajorAxisItemsOnGrid(autoMajorAxisAutoGridItems); |
| |
| m_grid.shrinkToFit(); |
| } |
| |
| void RenderGrid::populateExplicitGridAndOrderIterator() |
| { |
| OrderIteratorPopulator populator(m_orderIterator); |
| |
| size_t maximumRowIndex = std::max<size_t>(1, explicitGridRowCount()); |
| size_t maximumColumnIndex = std::max<size_t>(1, explicitGridColumnCount()); |
| |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| populator.collectChild(child); |
| |
| // This function bypasses the cache (cachedGridCoordinate()) as it is used to build it. |
| OwnPtr<GridSpan> rowPositions = resolveGridPositionsFromStyle(child, ForRows); |
| OwnPtr<GridSpan> columnPositions = resolveGridPositionsFromStyle(child, ForColumns); |
| |
| // |positions| is 0 if we need to run the auto-placement algorithm. Our estimation ignores |
| // this case as the auto-placement algorithm will grow the grid as needed. |
| if (rowPositions) |
| maximumRowIndex = std::max(maximumRowIndex, rowPositions->finalPositionIndex + 1); |
| if (columnPositions) |
| maximumColumnIndex = std::max(maximumColumnIndex, columnPositions->finalPositionIndex + 1); |
| } |
| |
| m_grid.grow(maximumRowIndex); |
| for (size_t i = 0; i < m_grid.size(); ++i) |
| m_grid[i].grow(maximumColumnIndex); |
| } |
| |
| void RenderGrid::placeSpecifiedMajorAxisItemsOnGrid(Vector<RenderBox*> autoGridItems) |
| { |
| for (size_t i = 0; i < autoGridItems.size(); ++i) { |
| OwnPtr<GridSpan> majorAxisPositions = resolveGridPositionsFromStyle(autoGridItems[i], autoPlacementMajorAxisDirection()); |
| GridIterator iterator(m_grid, autoPlacementMajorAxisDirection(), majorAxisPositions->initialPositionIndex); |
| if (OwnPtr<GridCoordinate> emptyGridArea = iterator.nextEmptyGridArea()) { |
| insertItemIntoGrid(autoGridItems[i], emptyGridArea->rows.initialPositionIndex, emptyGridArea->columns.initialPositionIndex); |
| continue; |
| } |
| |
| growGrid(autoPlacementMinorAxisDirection()); |
| OwnPtr<GridCoordinate> emptyGridArea = iterator.nextEmptyGridArea(); |
| ASSERT(emptyGridArea); |
| insertItemIntoGrid(autoGridItems[i], emptyGridArea->rows.initialPositionIndex, emptyGridArea->columns.initialPositionIndex); |
| } |
| } |
| |
| void RenderGrid::placeAutoMajorAxisItemsOnGrid(Vector<RenderBox*> autoGridItems) |
| { |
| for (size_t i = 0; i < autoGridItems.size(); ++i) |
| placeAutoMajorAxisItemOnGrid(autoGridItems[i]); |
| } |
| |
| void RenderGrid::placeAutoMajorAxisItemOnGrid(RenderBox* gridItem) |
| { |
| OwnPtr<GridSpan> minorAxisPositions = resolveGridPositionsFromStyle(gridItem, autoPlacementMinorAxisDirection()); |
| ASSERT(!resolveGridPositionsFromStyle(gridItem, autoPlacementMajorAxisDirection())); |
| size_t minorAxisIndex = 0; |
| if (minorAxisPositions) { |
| minorAxisIndex = minorAxisPositions->initialPositionIndex; |
| GridIterator iterator(m_grid, autoPlacementMinorAxisDirection(), minorAxisIndex); |
| if (OwnPtr<GridCoordinate> emptyGridArea = iterator.nextEmptyGridArea()) { |
| insertItemIntoGrid(gridItem, emptyGridArea->rows.initialPositionIndex, emptyGridArea->columns.initialPositionIndex); |
| return; |
| } |
| } else { |
| const size_t endOfMajorAxis = (autoPlacementMajorAxisDirection() == ForColumns) ? gridColumnCount() : gridRowCount(); |
| for (size_t majorAxisIndex = 0; majorAxisIndex < endOfMajorAxis; ++majorAxisIndex) { |
| GridIterator iterator(m_grid, autoPlacementMajorAxisDirection(), majorAxisIndex); |
| if (OwnPtr<GridCoordinate> emptyGridArea = iterator.nextEmptyGridArea()) { |
| insertItemIntoGrid(gridItem, emptyGridArea->rows.initialPositionIndex, emptyGridArea->columns.initialPositionIndex); |
| return; |
| } |
| } |
| } |
| |
| // We didn't find an empty grid area so we need to create an extra major axis line and insert our gridItem in it. |
| const size_t columnIndex = (autoPlacementMajorAxisDirection() == ForColumns) ? m_grid[0].size() : minorAxisIndex; |
| const size_t rowIndex = (autoPlacementMajorAxisDirection() == ForColumns) ? minorAxisIndex : m_grid.size(); |
| growGrid(autoPlacementMajorAxisDirection()); |
| insertItemIntoGrid(gridItem, rowIndex, columnIndex); |
| } |
| |
| RenderGrid::TrackSizingDirection RenderGrid::autoPlacementMajorAxisDirection() const |
| { |
| GridAutoFlow flow = style()->gridAutoFlow(); |
| ASSERT(flow != AutoFlowNone); |
| return (flow == AutoFlowColumn) ? ForColumns : ForRows; |
| } |
| |
| RenderGrid::TrackSizingDirection RenderGrid::autoPlacementMinorAxisDirection() const |
| { |
| GridAutoFlow flow = style()->gridAutoFlow(); |
| ASSERT(flow != AutoFlowNone); |
| return (flow == AutoFlowColumn) ? ForRows : ForColumns; |
| } |
| |
| void RenderGrid::dirtyGrid() |
| { |
| m_grid.resize(0); |
| m_gridItemCoordinate.clear(); |
| m_gridIsDirty = true; |
| } |
| |
| void RenderGrid::layoutGridItems() |
| { |
| placeItemsOnGrid(); |
| |
| Vector<GridTrack> columnTracks(gridColumnCount()); |
| Vector<GridTrack> rowTracks(gridRowCount()); |
| computedUsedBreadthOfGridTracks(ForColumns, columnTracks, rowTracks); |
| ASSERT(tracksAreWiderThanMinTrackBreadth(ForColumns, columnTracks)); |
| computedUsedBreadthOfGridTracks(ForRows, columnTracks, rowTracks); |
| ASSERT(tracksAreWiderThanMinTrackBreadth(ForRows, rowTracks)); |
| |
| for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { |
| LayoutPoint childPosition = findChildLogicalPosition(child, columnTracks, rowTracks); |
| |
| // Because the grid area cannot be styled, we don't need to adjust |
| // the grid breadth to account for 'box-sizing'. |
| LayoutUnit oldOverrideContainingBlockContentLogicalWidth = child->hasOverrideContainingBlockLogicalWidth() ? child->overrideContainingBlockContentLogicalWidth() : LayoutUnit(); |
| LayoutUnit oldOverrideContainingBlockContentLogicalHeight = child->hasOverrideContainingBlockLogicalHeight() ? child->overrideContainingBlockContentLogicalHeight() : LayoutUnit(); |
| |
| // FIXME: For children in a content sized track, we clear the overrideContainingBlockContentLogicalHeight |
| // in minContentForChild / maxContentForChild which means that we will always relayout the child. |
| LayoutUnit overrideContainingBlockContentLogicalWidth = gridAreaBreadthForChild(child, ForColumns, columnTracks); |
| LayoutUnit overrideContainingBlockContentLogicalHeight = gridAreaBreadthForChild(child, ForRows, rowTracks); |
| if (oldOverrideContainingBlockContentLogicalWidth != overrideContainingBlockContentLogicalWidth || oldOverrideContainingBlockContentLogicalHeight != overrideContainingBlockContentLogicalHeight) |
| child->setNeedsLayout(true, MarkOnlyThis); |
| |
| child->setOverrideContainingBlockContentLogicalWidth(overrideContainingBlockContentLogicalWidth); |
| child->setOverrideContainingBlockContentLogicalHeight(overrideContainingBlockContentLogicalHeight); |
| |
| LayoutRect oldChildRect = child->frameRect(); |
| |
| // FIXME: Grid items should stretch to fill their cells. Once we |
| // implement grid-{column,row}-align, we can also shrink to fit. For |
| // now, just size as if we were a regular child. |
| child->layoutIfNeeded(); |
| |
| // FIXME: Handle border & padding on the grid element. |
| child->setLogicalLocation(childPosition); |
| |
| // 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(oldChildRect); |
| } |
| |
| for (size_t i = 0; i < rowTracks.size(); ++i) |
| setLogicalHeight(logicalHeight() + rowTracks[i].m_usedBreadth); |
| |
| // FIXME: We should handle min / max logical height. |
| |
| setLogicalHeight(logicalHeight() + borderAndPaddingLogicalHeight()); |
| } |
| |
| GridCoordinate RenderGrid::cachedGridCoordinate(const RenderBox* gridItem) const |
| { |
| ASSERT(m_gridItemCoordinate.contains(gridItem)); |
| return m_gridItemCoordinate.get(gridItem); |
| } |
| |
| GridSpan RenderGrid::resolveGridPositionsFromAutoPlacementPosition(const RenderBox*, TrackSizingDirection, size_t initialPosition) const |
| { |
| // FIXME: We don't support spanning with auto positions yet. Once we do, this is wrong. Also we should make |
| // sure the grid can accomodate the new item as we only grow 1 position in a given direction. |
| return GridSpan(initialPosition, initialPosition); |
| } |
| |
| PassOwnPtr<GridSpan> RenderGrid::resolveGridPositionsFromStyle(const RenderBox* gridItem, TrackSizingDirection direction) const |
| { |
| const GridPosition& initialPosition = (direction == ForColumns) ? gridItem->style()->gridColumnStart() : gridItem->style()->gridRowStart(); |
| const GridPositionSide initialPositionSide = (direction == ForColumns) ? ColumnStartSide : RowStartSide; |
| const GridPosition& finalPosition = (direction == ForColumns) ? gridItem->style()->gridColumnEnd() : gridItem->style()->gridRowEnd(); |
| const GridPositionSide finalPositionSide = (direction == ForColumns) ? ColumnEndSide : RowEndSide; |
| |
| // We should NEVER see both spans as they should have been handled during style resolve. |
| ASSERT(!initialPosition.isSpan() || !finalPosition.isSpan()); |
| |
| if (initialPosition.shouldBeResolvedAgainstOppositePosition() && finalPosition.shouldBeResolvedAgainstOppositePosition()) { |
| if (style()->gridAutoFlow() == AutoFlowNone) |
| return adoptPtr(new GridSpan(0, 0)); |
| |
| // We can't get our grid positions without running the auto placement algorithm. |
| return nullptr; |
| } |
| |
| if (initialPosition.shouldBeResolvedAgainstOppositePosition()) { |
| // Infer the position from the final position ('auto / 1' or 'span 2 / 3' case). |
| const size_t finalResolvedPosition = resolveGridPositionFromStyle(finalPosition, finalPositionSide); |
| return resolveGridPositionAgainstOppositePosition(finalResolvedPosition, initialPosition, initialPositionSide); |
| } |
| |
| if (finalPosition.shouldBeResolvedAgainstOppositePosition()) { |
| // Infer our position from the initial position ('1 / auto' or '3 / span 2' case). |
| const size_t initialResolvedPosition = resolveGridPositionFromStyle(initialPosition, initialPositionSide); |
| return resolveGridPositionAgainstOppositePosition(initialResolvedPosition, finalPosition, finalPositionSide); |
| } |
| |
| size_t resolvedInitialPosition = resolveGridPositionFromStyle(initialPosition, initialPositionSide); |
| size_t resolvedFinalPosition = resolveGridPositionFromStyle(finalPosition, finalPositionSide); |
| |
| // If 'grid-after' specifies a line at or before that specified by 'grid-before', it computes to 'span 1'. |
| if (resolvedFinalPosition < resolvedInitialPosition) |
| resolvedFinalPosition = resolvedInitialPosition; |
| |
| return adoptPtr(new GridSpan(resolvedInitialPosition, resolvedFinalPosition)); |
| } |
| |
| inline static size_t adjustGridPositionForAfterEndSide(size_t resolvedPosition) |
| { |
| return resolvedPosition ? resolvedPosition - 1 : 0; |
| } |
| |
| static size_t adjustGridPositionForSide(size_t resolvedPosition, GridPositionSide side) |
| { |
| // An item finishing on the N-th line belongs to the N-1-th cell. |
| if (side == ColumnEndSide || side == RowEndSide) |
| return adjustGridPositionForAfterEndSide(resolvedPosition); |
| |
| return resolvedPosition; |
| } |
| |
| size_t RenderGrid::resolveNamedGridLinePositionFromStyle(const GridPosition& position, GridPositionSide side) const |
| { |
| ASSERT(!position.namedGridLine().isNull()); |
| |
| const NamedGridLinesMap& gridLinesNames = (side == ColumnStartSide || side == ColumnEndSide) ? style()->namedGridColumnLines() : style()->namedGridRowLines(); |
| NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine()); |
| if (it == gridLinesNames.end()) { |
| if (position.isPositive()) |
| return 0; |
| const size_t lastLine = explicitGridSizeForSide(side); |
| return adjustGridPositionForSide(lastLine, side); |
| } |
| |
| size_t namedGridLineIndex; |
| if (position.isPositive()) |
| namedGridLineIndex = std::min<size_t>(position.integerPosition(), it->value.size()) - 1; |
| else |
| namedGridLineIndex = std::max<int>(it->value.size() - abs(position.integerPosition()), 0); |
| return adjustGridPositionForSide(it->value[namedGridLineIndex], side); |
| } |
| |
| size_t RenderGrid::resolveGridPositionFromStyle(const GridPosition& position, GridPositionSide side) const |
| { |
| switch (position.type()) { |
| case ExplicitPosition: { |
| ASSERT(position.integerPosition()); |
| |
| if (!position.namedGridLine().isNull()) |
| return resolveNamedGridLinePositionFromStyle(position, side); |
| |
| // Handle <integer> explicit position. |
| if (position.isPositive()) |
| return adjustGridPositionForSide(position.integerPosition() - 1, side); |
| |
| size_t resolvedPosition = abs(position.integerPosition()) - 1; |
| const size_t endOfTrack = explicitGridSizeForSide(side); |
| |
| // Per http://lists.w3.org/Archives/Public/www-style/2013Mar/0589.html, we clamp negative value to the first line. |
| if (endOfTrack < resolvedPosition) |
| return 0; |
| |
| return adjustGridPositionForSide(endOfTrack - resolvedPosition, side); |
| } |
| case NamedGridAreaPosition: |
| { |
| NamedGridAreaMap::const_iterator it = style()->namedGridArea().find(position.namedGridLine()); |
| // Unknown grid area should have been computed to 'auto' by now. |
| ASSERT(it != style()->namedGridArea().end()); |
| const GridCoordinate& gridAreaCoordinate = it->value; |
| switch (side) { |
| case ColumnStartSide: |
| return gridAreaCoordinate.columns.initialPositionIndex; |
| case ColumnEndSide: |
| return gridAreaCoordinate.columns.finalPositionIndex; |
| case RowStartSide: |
| return gridAreaCoordinate.rows.initialPositionIndex; |
| case RowEndSide: |
| return gridAreaCoordinate.rows.finalPositionIndex; |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| case AutoPosition: |
| case SpanPosition: |
| // 'auto' and span depend on the opposite position for resolution (e.g. grid-row: auto / 1 or grid-column: span 3 / "myHeader"). |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| PassOwnPtr<GridSpan> RenderGrid::resolveGridPositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition& position, GridPositionSide side) const |
| { |
| if (position.isAuto()) |
| return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition); |
| |
| ASSERT(position.isSpan()); |
| ASSERT(position.spanPosition() > 0); |
| |
| if (!position.namedGridLine().isNull()) { |
| // span 2 'c' -> we need to find the appropriate grid line before / after our opposite position. |
| return resolveNamedGridLinePositionAgainstOppositePosition(resolvedOppositePosition, position, side); |
| } |
| |
| // 'span 1' is contained inside a single grid track regardless of the direction. |
| // That's why the CSS span value is one more than the offset we apply. |
| size_t positionOffset = position.spanPosition() - 1; |
| if (side == ColumnStartSide || side == RowStartSide) { |
| size_t initialResolvedPosition = std::max<int>(0, resolvedOppositePosition - positionOffset); |
| return GridSpan::create(initialResolvedPosition, resolvedOppositePosition); |
| } |
| |
| return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition + positionOffset); |
| } |
| |
| PassOwnPtr<GridSpan> RenderGrid::resolveNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition& position, GridPositionSide side) const |
| { |
| ASSERT(position.isSpan()); |
| ASSERT(!position.namedGridLine().isNull()); |
| // Negative positions are not allowed per the specification and should have been handled during parsing. |
| ASSERT(position.spanPosition() > 0); |
| |
| const NamedGridLinesMap& gridLinesNames = (side == ColumnStartSide || side == ColumnEndSide) ? style()->namedGridColumnLines() : style()->namedGridRowLines(); |
| NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine()); |
| |
| // If there is no named grid line of that name, we resolve the position to 'auto' (which is equivalent to 'span 1' in this case). |
| // See http://lists.w3.org/Archives/Public/www-style/2013Jun/0394.html. |
| if (it == gridLinesNames.end()) |
| return GridSpan::create(resolvedOppositePosition, resolvedOppositePosition); |
| |
| if (side == RowStartSide || side == ColumnStartSide) |
| return resolveBeforeStartNamedGridLinePositionAgainstOppositePosition(resolvedOppositePosition, position, it->value); |
| |
| return resolveAfterEndNamedGridLinePositionAgainstOppositePosition(resolvedOppositePosition, position, it->value); |
| } |
| |
| PassOwnPtr<GridSpan> RenderGrid::resolveBeforeStartNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition& position, const Vector<size_t>& gridLines) const |
| { |
| // The grid line inequality needs to be strict (which doesn't match the after / end case) because |resolvedOppositePosition| |
| // is already converted to an index in our grid representation (ie one was removed from the grid line to account for the side). |
| // FIXME: This could be a binary search as |gridLines| is ordered. |
| int firstLineBeforeOppositePositionIndex = gridLines.size() - 1; |
| for (; firstLineBeforeOppositePositionIndex >= 0 && gridLines[firstLineBeforeOppositePositionIndex] > resolvedOppositePosition; --firstLineBeforeOppositePositionIndex) { } |
| |
| size_t gridLineIndex = std::max<int>(0, firstLineBeforeOppositePositionIndex - position.spanPosition() + 1); |
| size_t resolvedGridLinePosition = gridLines[gridLineIndex]; |
| if (resolvedGridLinePosition > resolvedOppositePosition) |
| resolvedGridLinePosition = resolvedOppositePosition; |
| return GridSpan::create(resolvedGridLinePosition, resolvedOppositePosition); |
| } |
| |
| PassOwnPtr<GridSpan> RenderGrid::resolveAfterEndNamedGridLinePositionAgainstOppositePosition(size_t resolvedOppositePosition, const GridPosition& position, const Vector<size_t>& gridLines) const |
| { |
| // FIXME: This could be a binary search as |gridLines| is ordered. |
| size_t firstLineAfterOppositePositionIndex = 0; |
| for (; firstLineAfterOppositePositionIndex < gridLines.size() && gridLines[firstLineAfterOppositePositionIndex] <= resolvedOppositePosition; ++firstLineAfterOppositePositionIndex) { } |
| |
| size_t gridLineIndex = std::min(gridLines.size() - 1, firstLineAfterOppositePositionIndex + position.spanPosition() - 1); |
| size_t resolvedGridLinePosition = adjustGridPositionForAfterEndSide(gridLines[gridLineIndex]); |
| if (resolvedGridLinePosition < resolvedOppositePosition) |
| resolvedGridLinePosition = resolvedOppositePosition; |
| return GridSpan::create(resolvedOppositePosition, resolvedGridLinePosition); |
| } |
| |
| LayoutUnit RenderGrid::gridAreaBreadthForChild(const RenderBox* child, TrackSizingDirection direction, const Vector<GridTrack>& tracks) const |
| { |
| const GridCoordinate& coordinate = cachedGridCoordinate(child); |
| const GridSpan& span = (direction == ForColumns) ? coordinate.columns : coordinate.rows; |
| LayoutUnit gridAreaBreadth = 0; |
| for (size_t trackIndex = span.initialPositionIndex; trackIndex <= span.finalPositionIndex; ++trackIndex) |
| gridAreaBreadth += tracks[trackIndex].m_usedBreadth; |
| return gridAreaBreadth; |
| } |
| |
| LayoutPoint RenderGrid::findChildLogicalPosition(RenderBox* child, const Vector<GridTrack>& columnTracks, const Vector<GridTrack>& rowTracks) |
| { |
| const GridCoordinate& coordinate = cachedGridCoordinate(child); |
| |
| // The grid items should be inside the grid container's border box, that's why they need to be shifted. |
| LayoutPoint offset(borderAndPaddingStart(), borderAndPaddingBefore()); |
| // FIXME: |columnTrack| and |rowTrack| should be smaller than our column / row count. |
| for (size_t i = 0; i < coordinate.columns.initialPositionIndex && i < columnTracks.size(); ++i) |
| offset.setX(offset.x() + columnTracks[i].m_usedBreadth); |
| for (size_t i = 0; i < coordinate.rows.initialPositionIndex && i < rowTracks.size(); ++i) |
| offset.setY(offset.y() + rowTracks[i].m_usedBreadth); |
| |
| // FIXME: Handle margins on the grid item. |
| return offset; |
| } |
| |
| void RenderGrid::paintChildren(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| { |
| for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next()) |
| paintChild(child, paintInfo, paintOffset); |
| } |
| |
| const char* RenderGrid::renderName() const |
| { |
| if (isFloating()) |
| return "RenderGrid (floating)"; |
| if (isOutOfFlowPositioned()) |
| return "RenderGrid (positioned)"; |
| if (isAnonymous()) |
| return "RenderGrid (generated)"; |
| if (isRelPositioned()) |
| return "RenderGrid (relative positioned)"; |
| return "RenderGrid"; |
| } |
| |
| } // namespace WebCore |