LayoutRect RenderMultiColumnSet::columnRectAt(unsigned index) const
{
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutUnit colLogicalHeight = computedColumnHeight();
LayoutUnit colLogicalTop = borderAndPaddingBefore();
LayoutUnit colLogicalLeft = borderAndPaddingLogicalLeft();
LayoutUnit colGap = columnGap();
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
if (progressionInline) {
if (style().isLeftToRightDirection() ^ progressionReversed)
colLogicalLeft += index * (colLogicalWidth + colGap);
else
colLogicalLeft += contentLogicalWidth() - colLogicalWidth - index * (colLogicalWidth + colGap);
} else {
if (!progressionReversed)
colLogicalTop += index * (colLogicalHeight + colGap);
else
colLogicalTop += contentLogicalHeight() - colLogicalHeight - index * (colLogicalHeight + colGap);
}
if (isHorizontalWritingMode())
return LayoutRect(colLogicalLeft, colLogicalTop, colLogicalWidth, colLogicalHeight);
return LayoutRect(colLogicalTop, colLogicalLeft, colLogicalHeight, colLogicalWidth);
}
IntRect computeTextBoundingBox(const RenderText& textRenderer, const Layout& layout)
{
auto resolver = lineResolver(toRenderBlockFlow(*textRenderer.parent()), layout);
auto it = resolver.begin();
auto end = resolver.end();
if (it == end)
return IntRect();
auto firstLineRect = *it;
float left = firstLineRect.x();
float right = firstLineRect.maxX();
float bottom = firstLineRect.maxY();
for (++it; it != end; ++it) {
auto rect = *it;
if (rect.x() < left)
left = rect.x();
if (rect.maxX() > right)
right = rect.maxX();
if (rect.maxY() > bottom)
bottom = rect.maxY();
}
float x = left;
float y = firstLineRect.y();
float width = right - left;
float height = bottom - y;
return enclosingIntRect(FloatRect(x, y, width, height));
}
static inline InlineFlowBox* flowBoxForRenderer(RenderObject* renderer)
{
if (!renderer)
return 0;
if (renderer->isRenderBlockFlow()) {
// If we're given a block element, it has to be a RenderSVGText.
ASSERT(renderer->isSVGText());
RenderBlockFlow& renderBlock = toRenderBlockFlow(*renderer);
// RenderSVGText only ever contains a single line box.
InlineFlowBox* flowBox = renderBlock.firstLineBox();
ASSERT(flowBox == renderBlock.lastLineBox());
return flowBox;
}
if (renderer->isRenderInline()) {
// We're given a RenderSVGInline or objects that derive from it (RenderSVGTSpan / RenderSVGTextPath)
RenderInline& renderInline = toRenderInline(*renderer);
// RenderSVGInline only ever contains a single line box.
InlineFlowBox* flowBox = renderInline.firstLineBox();
ASSERT(flowBox == renderInline.lastLineBox());
return flowBox;
}
ASSERT_NOT_REACHED();
return 0;
}
void RenderMultiColumnFlowThread::evacuateAndDestroy()
{
RenderBlockFlow* multicolContainer = multiColumnBlockFlow();
m_beingEvacuated = true;
// Delete the line box tree.
deleteLines();
LayoutStateDisabler layoutStateDisabler(&view());
// First promote all children of the flow thread. Before we move them to the flow thread's
// container, we need to unregister the flow thread, so that they aren't just re-added again to
// the flow thread that we're trying to empty.
multicolContainer->setMultiColumnFlowThread(nullptr);
moveAllChildrenTo(multicolContainer, true);
// Move spanners back to their original DOM position in the tree, and destroy the placeholders.
SpannerMap::iterator it;
while ((it = m_spannerMap.begin()) != m_spannerMap.end()) {
RenderBox* spanner = it->key;
RenderMultiColumnSpannerPlaceholder* placeholder = it->value;
RenderBlockFlow* originalContainer = toRenderBlockFlow(placeholder->parent());
multicolContainer->removeChild(*spanner);
originalContainer->addChild(spanner, placeholder);
placeholder->destroy();
m_spannerMap.remove(it);
}
// Remove all sets.
while (RenderMultiColumnSet* columnSet = firstMultiColumnSet())
columnSet->destroy();
destroy();
}
void RenderMultiColumnSet::prepareForLayout()
{
RenderBlockFlow* multicolBlock = toRenderBlockFlow(parent());
const RenderStyle& multicolStyle = multicolBlock->style();
// Set box logical top.
ASSERT(!previousSiblingBox() || !previousSiblingBox()->isRenderMultiColumnSet()); // FIXME: multiple set not implemented; need to examine previous set to calculate the correct logical top.
setLogicalTop(multicolBlock->borderAndPaddingBefore());
// Set box width.
updateLogicalWidth();
if (multicolBlock->multiColumnFlowThread()->requiresBalancing()) {
// Set maximum column height. We will not stretch beyond this.
m_maxColumnHeight = RenderFlowThread::maxLogicalHeight();
if (!multicolStyle.logicalHeight().isAuto()) {
m_maxColumnHeight = multicolBlock->computeContentLogicalHeight(multicolStyle.logicalHeight());
if (m_maxColumnHeight == -1)
m_maxColumnHeight = RenderFlowThread::maxLogicalHeight();
}
if (!multicolStyle.logicalMaxHeight().isUndefined()) {
LayoutUnit logicalMaxHeight = multicolBlock->computeContentLogicalHeight(multicolStyle.logicalMaxHeight());
if (logicalMaxHeight != -1 && m_maxColumnHeight > logicalMaxHeight)
m_maxColumnHeight = logicalMaxHeight;
}
m_maxColumnHeight = heightAdjustedForSetOffset(m_maxColumnHeight);
m_computedColumnHeight = 0; // Restart balancing.
} else
setAndConstrainColumnHeight(heightAdjustedForSetOffset(multicolBlock->multiColumnFlowThread()->columnHeightAvailable()));
clearForcedBreaks();
// Nuke previously stored minimum column height. Contents may have changed for all we know.
m_minimumColumnHeight = 0;
}
LayoutUnit RootInlineBox::selectionTopAdjustedForPrecedingBlock() const
{
const RootInlineBox& rootBox = root();
LayoutUnit top = selectionTop();
RenderObject::SelectionState blockSelectionState = rootBox.blockFlow().selectionState();
if (blockSelectionState != RenderObject::SelectionInside && blockSelectionState != RenderObject::SelectionEnd)
return top;
LayoutSize offsetToBlockBefore;
if (RenderBlock* block = rootBox.blockFlow().blockBeforeWithinSelectionRoot(offsetToBlockBefore)) {
if (block->isRenderBlockFlow()) {
if (RootInlineBox* lastLine = toRenderBlockFlow(block)->lastRootBox()) {
RenderObject::SelectionState lastLineSelectionState = lastLine->selectionState();
if (lastLineSelectionState != RenderObject::SelectionInside && lastLineSelectionState != RenderObject::SelectionStart)
return top;
LayoutUnit lastLineSelectionBottom = lastLine->selectionBottom() + offsetToBlockBefore.height();
top = std::max(top, lastLineSelectionBottom);
}
}
}
return top;
}
IntPoint computeTextFirstRunLocation(const RenderText& textRenderer, const Layout& layout)
{
auto resolver = runResolver(toRenderBlockFlow(*textRenderer.parent()), layout);
auto begin = resolver.begin();
if (begin == resolver.end())
return IntPoint();
return flooredIntPoint((*begin).rect().location());
}
LayoutUnit RenderMultiColumnSet::heightAdjustedForSetOffset(LayoutUnit height) const
{
RenderBlockFlow* multicolBlock = toRenderBlockFlow(parent());
LayoutUnit contentLogicalTop = logicalTop() - multicolBlock->borderAndPaddingBefore();
height -= contentLogicalTop;
return std::max(height, LayoutUnit::fromPixel(1)); // Let's avoid zero height, as that would probably cause an infinite amount of columns to be created.
}
LayoutUnit RenderMultiColumnSet::columnGap() const
{
// FIXME: Eventually we will cache the column gap when the widths of columns start varying, but for now we just
// go to the parent block to get the gap.
RenderBlockFlow* parentBlock = toRenderBlockFlow(parent());
if (parentBlock->style().hasNormalColumnGap())
return parentBlock->style().fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins.
return parentBlock->style().columnGap();
}
void RenderMultiColumnSet::updateLogicalWidth()
{
RenderBlockFlow* parentBlock = toRenderBlockFlow(parent());
setComputedColumnWidthAndCount(parentBlock->multiColumnFlowThread()->columnWidth(), parentBlock->multiColumnFlowThread()->columnCount()); // FIXME: This will eventually vary if we are contained inside regions.
// FIXME: When we add regions support, we'll start it off at the width of the multi-column
// block in that particular region.
setLogicalWidth(parentBox()->contentLogicalWidth());
}
void RenderMultiColumnSet::addForcedBreak(LayoutUnit offsetFromFirstPage)
{
if (!toRenderBlockFlow(parent())->multiColumnFlowThread()->requiresBalancing())
return;
if (!m_contentRuns.isEmpty() && offsetFromFirstPage <= m_contentRuns.last().breakOffset())
return;
// Append another item as long as we haven't exceeded used column count. What ends up in the
// overflow area shouldn't affect column balancing.
if (m_contentRuns.size() < m_computedColumnCount)
m_contentRuns.append(ContentRun(offsetFromFirstPage));
}
Vector<IntRect> collectTextAbsoluteRects(const RenderText& textRenderer, const Layout& layout, const LayoutPoint& accumulatedOffset)
{
Vector<IntRect> rects;
auto resolver = runResolver(toRenderBlockFlow(*textRenderer.parent()), layout);
for (auto it = resolver.begin(), end = resolver.end(); it != end; ++it) {
const auto& run = *it;
auto rect = run.rect();
rects.append(enclosingIntRect(FloatRect(accumulatedOffset + rect.location(), rect.size())));
}
return rects;
}
Vector<FloatQuad> collectTextAbsoluteQuads(const RenderText& textRenderer, const Layout& layout, bool* wasFixed)
{
Vector<FloatQuad> quads;
auto resolver = runResolver(toRenderBlockFlow(*textRenderer.parent()), layout);
for (auto it = resolver.begin(), end = resolver.end(); it != end; ++it) {
const auto& run = *it;
auto rect = run.rect();
quads.append(textRenderer.localToAbsoluteQuad(FloatQuad(rect), 0, wasFixed));
}
return quads;
}
LayoutUnit RenderMultiColumnSet::initialBlockOffsetForPainting() const
{
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionIsInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
LayoutUnit result = 0;
if (!progressionIsInline && progressionReversed) {
LayoutRect colRect = columnRectAt(0);
result = isHorizontalWritingMode() ? colRect.y() : colRect.x();
if (style().isFlippedBlocksWritingMode())
result = -result;
}
return result;
}
void RenderMultiColumnSet::adjustRegionBoundsFromFlowThreadPortionRect(const LayoutPoint& layerOffset, LayoutRect& regionBounds)
{
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerOffset.y() : layerOffset.x();
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
LayoutUnit colGap = columnGap();
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutRect flowThreadPortion = flowThreadPortionRectAt(startColumn);
LayoutPoint translationOffset;
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionIsInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
LayoutUnit initialBlockOffset = initialBlockOffsetForPainting();
LayoutUnit inlineOffset = progressionIsInline ? startColumn * (colLogicalWidth + colGap) : LayoutUnit();
bool leftToRight = style().isLeftToRightDirection() ^ progressionReversed;
if (!leftToRight) {
inlineOffset = -inlineOffset;
if (progressionReversed)
inlineOffset += contentLogicalWidth() - colLogicalWidth;
}
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = initialBlockOffset + (isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x());
if (!progressionIsInline) {
if (!progressionReversed)
blockOffset = startColumn * colGap;
else
blockOffset -= startColumn * (computedColumnHeight() + colGap);
}
if (isFlippedBlocksWritingMode(style().writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
regionBounds.moveBy(roundedIntPoint(-translationOffset));
}
void RenderBoxModelObject::moveChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* startChild, RenderObject* endChild, RenderObject* beforeChild, bool fullRemoveInsert)
{
// This condition is rarely hit since this function is usually called on
// anonymous blocks which can no longer carry positioned objects (see r120761)
// or when fullRemoveInsert is false.
if (fullRemoveInsert && isRenderBlock()) {
RenderBlock* block = toRenderBlock(this);
block->removePositionedObjects(0);
if (block->isRenderBlockFlow())
toRenderBlockFlow(block)->removeFloatingObjects();
}
ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
for (RenderObject* child = startChild; child && child != endChild; ) {
// Save our next sibling as moveChildTo will clear it.
RenderObject* nextSibling = child->nextSibling();
moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
child = nextSibling;
}
}
LayoutRect RenderMultiColumnSet::flowThreadPortionOverflowRect(const LayoutRect& portionRect, unsigned index, unsigned colCount, LayoutUnit colGap)
{
// This function determines the portion of the flow thread that paints for the column. Along the inline axis, columns are
// unclipped at outside edges (i.e., the first and last column in the set), and they clip to half the column
// gap along interior edges.
//
// In the block direction, we will not clip overflow out of the top of the first column, or out of the bottom of
// the last column. This applies only to the true first column and last column across all column sets.
//
// FIXME: Eventually we will know overflow on a per-column basis, but we can't do this until we have a painting
// mode that understands not to paint contents from a previous column in the overflow area of a following column.
// This problem applies to regions and pages as well and is not unique to columns.
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool isFirstColumn = !index;
bool isLastColumn = index == colCount - 1;
bool isLeftmostColumn = style().isLeftToRightDirection() ^ progressionReversed ? isFirstColumn : isLastColumn;
bool isRightmostColumn = style().isLeftToRightDirection() ^ progressionReversed ? isLastColumn : isFirstColumn;
// Calculate the overflow rectangle, based on the flow thread's, clipped at column logical
// top/bottom unless it's the first/last column.
LayoutRect overflowRect = overflowRectForFlowThreadPortion(portionRect, isFirstColumn && isFirstRegion(), isLastColumn && isLastRegion(), VisualOverflow);
// Avoid overflowing into neighboring columns, by clipping in the middle of adjacent column
// gaps. Also make sure that we avoid rounding errors.
if (isHorizontalWritingMode()) {
if (!isLeftmostColumn)
overflowRect.shiftXEdgeTo(portionRect.x() - colGap / 2);
if (!isRightmostColumn)
overflowRect.shiftMaxXEdgeTo(portionRect.maxX() + colGap - colGap / 2);
} else {
if (!isLeftmostColumn)
overflowRect.shiftYEdgeTo(portionRect.y() - colGap / 2);
if (!isRightmostColumn)
overflowRect.shiftMaxYEdgeTo(portionRect.maxY() + colGap - colGap / 2);
}
return overflowRect;
}
static PassRefPtr<InspectorObject> buildObjectForRegionHighlight(FrameView* mainView, RenderRegion* region)
{
FrameView* containingView = region->frame().view();
if (!containingView)
return nullptr;
RenderBlockFlow* regionContainer = toRenderBlockFlow(region->parent());
LayoutRect borderBox = regionContainer->borderBoxRect();
borderBox.setWidth(borderBox.width() + regionContainer->verticalScrollbarWidth());
borderBox.setHeight(borderBox.height() + regionContainer->horizontalScrollbarHeight());
// Create incoming and outgoing boxes that we use to chain the regions toghether.
const LayoutSize linkBoxSize(10, 10);
const LayoutSize linkBoxMidpoint(linkBoxSize.width() / 2, linkBoxSize.height() / 2);
LayoutRect incomingRectBox = LayoutRect(borderBox.location() - linkBoxMidpoint, linkBoxSize);
LayoutRect outgoingRectBox = LayoutRect(borderBox.location() - linkBoxMidpoint + borderBox.size(), linkBoxSize);
// Move the link boxes slightly inside the region border box.
LayoutUnit maxUsableHeight = std::max(LayoutUnit(), borderBox.height() - linkBoxMidpoint.height());
LayoutUnit linkBoxVerticalOffset = std::min(LayoutUnit::fromPixel(15), maxUsableHeight);
incomingRectBox.move(0, linkBoxVerticalOffset);
outgoingRectBox.move(0, -linkBoxVerticalOffset);
FloatQuad borderRectQuad = regionContainer->localToAbsoluteQuad(FloatRect(borderBox));
FloatQuad incomingRectQuad = regionContainer->localToAbsoluteQuad(FloatRect(incomingRectBox));
FloatQuad outgoingRectQuad = regionContainer->localToAbsoluteQuad(FloatRect(outgoingRectBox));
contentsQuadToPage(mainView, containingView, borderRectQuad);
contentsQuadToPage(mainView, containingView, incomingRectQuad);
contentsQuadToPage(mainView, containingView, outgoingRectQuad);
RefPtr<InspectorObject> regionObject = InspectorObject::create();
regionObject->setArray("borderQuad", buildArrayForQuad(borderRectQuad));
regionObject->setArray("incomingQuad", buildArrayForQuad(incomingRectQuad));
regionObject->setArray("outgoingQuad", buildArrayForQuad(outgoingRectQuad));
return regionObject.release();
}
void RenderMultiColumnFlowThread::autoGenerateRegionsToBlockOffset(LayoutUnit /*offset*/)
{
// This function ensures we have the correct column set information at all times.
// For a simple multi-column layout in continuous media, only one column set child is required.
// Once a column is nested inside an enclosing pagination context, the number of column sets
// required becomes 2n-1, where n is the total number of nested pagination contexts. For example:
//
// Column layout with no enclosing pagination model = 2 * 1 - 1 = 1 column set.
// Columns inside pages = 2 * 2 - 1 = 3 column sets (bottom of first page, all the subsequent pages, then the last page).
// Columns inside columns inside pages = 2 * 3 - 1 = 5 column sets.
//
// In addition, column spans will force a column set to "split" into before/after sets around the spanning element.
//
// Finally, we will need to deal with columns inside regions. If regions have variable widths, then there will need
// to be unique column sets created inside any region whose width is different from its surrounding regions. This is
// actually pretty similar to the spanning case, in that we break up the column sets whenever the width varies.
//
// FIXME: For now just make one column set. This matches the old multi-column code.
// Right now our goal is just feature parity with the old multi-column code so that we can switch over to the
// new code as soon as possible.
RenderMultiColumnSet* firstSet = toRenderMultiColumnSet(firstRegion());
if (firstSet)
return;
invalidateRegions();
RenderBlockFlow* parentBlock = toRenderBlockFlow(parent());
firstSet = new RenderMultiColumnSet(*this, RenderStyle::createAnonymousStyleWithDisplay(&parentBlock->style(), BLOCK));
firstSet->initializeStyle();
parentBlock->RenderBlock::addChild(firstSet);
// Even though we aren't placed yet, we can go ahead and set up our size. At this point we're
// typically in the middle of laying out the thread, attempting to paginate, and we need to do
// some rudimentary "layout" of the set now, so that pagination will work.
firstSet->prepareForLayout();
validateRegions();
}
bool RenderMultiColumnSet::recalculateBalancedHeight(bool initial)
{
ASSERT(toRenderBlockFlow(parent())->multiColumnFlowThread()->requiresBalancing());
LayoutUnit oldColumnHeight = m_computedColumnHeight;
if (initial)
distributeImplicitBreaks();
LayoutUnit newColumnHeight = calculateBalancedHeight(initial);
setAndConstrainColumnHeight(newColumnHeight);
// After having calculated an initial column height, the multicol container typically needs at
// least one more layout pass with a new column height, but if a height was specified, we only
// need to do this if we think that we need less space than specified. Conversely, if we
// determined that the columns need to be as tall as the specified height of the container, we
// have already laid it out correctly, and there's no need for another pass.
if (m_computedColumnHeight == oldColumnHeight)
return false; // No change. We're done.
m_minSpaceShortage = RenderFlowThread::maxLogicalHeight();
clearForcedBreaks();
return true; // Need another pass.
}
void RenderMultiColumnFlowThread::flowThreadDescendantInserted(RenderObject* descendant)
{
if (gShiftingSpanner || m_beingEvacuated || descendant->isInFlowRenderFlowThread())
return;
RenderObject* subtreeRoot = descendant;
for (; descendant; descendant = (descendant ? descendant->nextInPreOrder(subtreeRoot) : nullptr)) {
if (descendant->isRenderMultiColumnSpannerPlaceholder()) {
// A spanner's placeholder has been inserted. The actual spanner renderer is moved from
// where it would otherwise occur (if it weren't a spanner) to becoming a sibling of the
// column sets.
RenderMultiColumnSpannerPlaceholder* placeholder = toRenderMultiColumnSpannerPlaceholder(descendant);
if (placeholder->flowThread() != this) {
// This isn't our spanner! It shifted here from an ancestor multicolumn block. It's going to end up
// becoming our spanner instead, but for it to do that we first have to nuke the original spanner,
// and get the spanner content back into this flow thread.
RenderBox* spanner = placeholder->spanner();
// Get info for the move of the original content back into our flow thread.
RenderBoxModelObject* placeholderParent = toRenderBoxModelObject(placeholder->parent());
// We have to nuke the placeholder, since the ancestor already lost the mapping to it when
// we shifted the placeholder down into this flow thread.
RenderObject* placeholderNextSibling = placeholderParent->removeChild(*placeholder);
// Get the ancestor multicolumn flow thread to clean up its mess.
RenderBlockFlow* ancestorBlock = toRenderBlockFlow(spanner->parent());
ancestorBlock->multiColumnFlowThread()->flowThreadRelativeWillBeRemoved(spanner);
// Now move the original content into our flow thread. It will end up calling flowThreadDescendantInserted
// on the new content only, and everything will get set up properly.
ancestorBlock->moveChildTo(placeholderParent, spanner, placeholderNextSibling, true);
// Advance descendant.
descendant = placeholderNextSibling;
// If the spanner was the subtree root, then we're done, since there is nothing else left to insert.
if (!descendant)
return;
// Now that we have done this, we can continue past the spanning content, since we advanced
// descendant already.
if (descendant)
descendant = descendant->previousInPreOrder(subtreeRoot);
continue;
}
ASSERT(!m_spannerMap.get(placeholder->spanner()));
m_spannerMap.add(placeholder->spanner(), placeholder);
ASSERT(!placeholder->firstChild()); // There should be no children here, but if there are, we ought to skip them.
continue;
}
RenderBlockFlow* multicolContainer = multiColumnBlockFlow();
RenderObject* nextRendererInFlowThread = descendant->nextInPreOrderAfterChildren(this);
RenderObject* insertBeforeMulticolChild = nullptr;
if (isValidColumnSpanner(this, descendant)) {
// This is a spanner (column-span:all). Such renderers are moved from where they would
// otherwise occur in the render tree to becoming a direct child of the multicol container,
// so that they live among the column sets. This simplifies the layout implementation, and
// basically just relies on regular block layout done by the RenderBlockFlow that
// establishes the multicol container.
RenderBlockFlow* container = toRenderBlockFlow(descendant->parent());
RenderMultiColumnSet* setToSplit = nullptr;
if (nextRendererInFlowThread) {
setToSplit = findSetRendering(descendant);
if (setToSplit) {
setToSplit->setNeedsLayout();
insertBeforeMulticolChild = setToSplit->nextSibling();
}
}
// Moving a spanner's renderer so that it becomes a sibling of the column sets requires us
// to insert an anonymous placeholder in the tree where the spanner's renderer otherwise
// would have been. This is needed for a two reasons: We need a way of separating inline
// content before and after the spanner, so that it becomes separate line boxes. Secondly,
// this placeholder serves as a break point for column sets, so that, when encountered, we
// end flowing one column set and move to the next one.
RenderMultiColumnSpannerPlaceholder* placeholder = RenderMultiColumnSpannerPlaceholder::createAnonymous(this, toRenderBox(descendant), &container->style());
container->addChild(placeholder, descendant->nextSibling());
container->removeChild(*descendant);
// This is a guard to stop an ancestor flow thread from processing the spanner.
gShiftingSpanner = true;
multicolContainer->RenderBlock::addChild(descendant, insertBeforeMulticolChild);
gShiftingSpanner = false;
// The spanner has now been moved out from the flow thread, but we don't want to
// examine its children anyway. They are all part of the spanner and shouldn't trigger
// creation of column sets or anything like that. Continue at its original position in
// the tree, i.e. where the placeholder was just put.
if (subtreeRoot == descendant)
subtreeRoot = placeholder;
descendant = placeholder;
} else {
// This is regular multicol content, i.e. not part of a spanner.
if (nextRendererInFlowThread && nextRendererInFlowThread->isRenderMultiColumnSpannerPlaceholder()) {
// Inserted right before a spanner. Is there a set for us there?
RenderMultiColumnSpannerPlaceholder* placeholder = toRenderMultiColumnSpannerPlaceholder(nextRendererInFlowThread);
if (RenderObject* previous = placeholder->spanner()->previousSibling()) {
if (previous->isRenderMultiColumnSet())
continue; // There's already a set there. Nothing to do.
}
insertBeforeMulticolChild = placeholder->spanner();
} else if (RenderMultiColumnSet* lastSet = lastMultiColumnSet()) {
// This child is not an immediate predecessor of a spanner, which means that if this
// child precedes a spanner at all, there has to be a column set created for us there
// already. If it doesn't precede any spanner at all, on the other hand, we need a
// column set at the end of the multicol container. We don't really check here if the
// child inserted precedes any spanner or not (as that's an expensive operation). Just
// make sure we have a column set at the end. It's no big deal if it remains unused.
if (!lastSet->nextSibling())
continue;
}
}
// Need to create a new column set when there's no set already created. We also always insert
// another column set after a spanner. Even if it turns out that there are no renderers
// following the spanner, there may be bottom margins there, which take up space.
RenderMultiColumnSet* newSet = new RenderMultiColumnSet(*this, RenderStyle::createAnonymousStyleWithDisplay(&multicolContainer->style(), BLOCK));
newSet->initializeStyle();
multicolContainer->RenderBlock::addChild(newSet, insertBeforeMulticolChild);
invalidateRegions();
// We cannot handle immediate column set siblings at the moment (and there's no need for
// it, either). There has to be at least one spanner separating them.
ASSERT(!previousColumnSetOrSpannerSiblingOf(newSet) || !previousColumnSetOrSpannerSiblingOf(newSet)->isRenderMultiColumnSet());
ASSERT(!nextColumnSetOrSpannerSiblingOf(newSet) || !nextColumnSetOrSpannerSiblingOf(newSet)->isRenderMultiColumnSet());
}
}
void RenderMultiColumnSet::collectLayerFragments(LayerFragments& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect)
{
// Let's start by introducing the different coordinate systems involved here. They are different
// in how they deal with writing modes and columns. RenderLayer rectangles tend to be more
// physical than the rectangles used in RenderObject & co.
//
// The two rectangles passed to this method are physical, except that we pretend that there's
// only one long column (that's the flow thread). They are relative to the top left corner of
// the flow thread. All rectangles being compared to the dirty rect also need to be in this
// coordinate system.
//
// Then there's the output from this method - the stuff we put into the list of fragments. The
// translationOffset point is the actual physical translation required to get from a location in
// the flow thread to a location in some column. The paginationClip rectangle is in the same
// coordinate system as the two rectangles passed to this method (i.e. physical, in flow thread
// coordinates, pretending that there's only one long column).
//
// All other rectangles in this method are slightly less physical, when it comes to how they are
// used with different writing modes, but they aren't really logical either. They are just like
// RenderBox::frameRect(). More precisely, the sizes are physical, and the inline direction
// coordinate is too, but the block direction coordinate is always "logical top". These
// rectangles also pretend that there's only one long column, i.e. they are for the flow thread.
//
// To sum up: input and output from this method are "physical" RenderLayer-style rectangles and
// points, while inside this method we mostly use the RenderObject-style rectangles (with the
// block direction coordinate always being logical top).
// Put the layer bounds into flow thread-local coordinates by flipping it first. Since we're in
// a renderer, most rectangles are represented this way.
LayoutRect layerBoundsInFlowThread(layerBoundingBox);
flowThread()->flipForWritingMode(layerBoundsInFlowThread);
// Now we can compare with the flow thread portions owned by each column. First let's
// see if the rect intersects our flow thread portion at all.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(RenderRegion::flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're checking.
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerBoundsInFlowThread.y() : layerBoundsInFlowThread.x();
LayoutUnit layerLogicalBottom = (isHorizontalWritingMode() ? layerBoundsInFlowThread.maxY() : layerBoundsInFlowThread.maxX()) - 1;
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column set.
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
unsigned endColumn = columnIndexAtOffset(layerLogicalBottom);
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutUnit colGap = columnGap();
unsigned colCount = columnCount();
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionIsInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
LayoutUnit initialBlockOffset = initialBlockOffsetForPainting();
for (unsigned i = startColumn; i <= endColumn; i++) {
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// In order to create a fragment we must intersect the portion painted by this column.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(flowThreadOverflowPortion);
if (clippedRect.isEmpty())
continue;
// We also need to intersect the dirty rect. We have to apply a translation and shift based off
// our column index.
LayoutPoint translationOffset;
LayoutUnit inlineOffset = progressionIsInline ? i * (colLogicalWidth + colGap) : LayoutUnit();
bool leftToRight = style().isLeftToRightDirection() ^ progressionReversed;
if (!leftToRight) {
inlineOffset = -inlineOffset;
if (progressionReversed)
inlineOffset += contentLogicalWidth() - colLogicalWidth;
}
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = initialBlockOffset + (isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x());
if (!progressionIsInline) {
if (!progressionReversed)
blockOffset = i * colGap;
else
blockOffset -= i * (computedColumnHeight() + colGap);
}
if (isFlippedBlocksWritingMode(style().writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
// Shift the dirty rect to be in flow thread coordinates with this translation applied.
LayoutRect translatedDirtyRect(dirtyRect);
translatedDirtyRect.moveBy(-translationOffset);
// See if we intersect the dirty rect.
clippedRect = layerBoundingBox;
clippedRect.intersect(translatedDirtyRect);
if (clippedRect.isEmpty())
continue;
// Something does need to paint in this column. Make a fragment now and supply the physical translation
// offset and the clip rect for the column with that offset applied.
LayerFragment fragment;
fragment.paginationOffset = translationOffset;
LayoutRect flippedFlowThreadOverflowPortion(flowThreadOverflowPortion);
// Flip it into more a physical (RenderLayer-style) rectangle.
flowThread()->flipForWritingMode(flippedFlowThreadOverflowPortion);
fragment.paginationClip = flippedFlowThreadOverflowPortion;
fragments.append(fragment);
}
}
static PassRefPtr<InspectorObject> buildObjectForElementInfo(Node* node)
{
if (!node->isElementNode() || !node->document().frame())
return nullptr;
RefPtr<InspectorObject> elementInfo = InspectorObject::create();
Element* element = toElement(node);
bool isXHTML = element->document().isXHTMLDocument();
elementInfo->setString("tagName", isXHTML ? element->nodeName() : element->nodeName().lower());
elementInfo->setString("idValue", element->getIdAttribute());
HashSet<AtomicString> usedClassNames;
if (element->hasClass() && element->isStyledElement()) {
StringBuilder classNames;
const SpaceSplitString& classNamesString = toStyledElement(element)->classNames();
size_t classNameCount = classNamesString.size();
for (size_t i = 0; i < classNameCount; ++i) {
const AtomicString& className = classNamesString[i];
if (usedClassNames.contains(className))
continue;
usedClassNames.add(className);
classNames.append('.');
classNames.append(className);
}
elementInfo->setString("className", classNames.toString());
}
RenderElement* renderer = element->renderer();
Frame* containingFrame = node->document().frame();
FrameView* containingView = containingFrame->view();
IntRect boundingBox = pixelSnappedIntRect(containingView->contentsToRootView(renderer->absoluteBoundingBoxRect()));
RenderBoxModelObject* modelObject = renderer->isBoxModelObject() ? toRenderBoxModelObject(renderer) : nullptr;
elementInfo->setString("nodeWidth", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetWidth(), *modelObject) : boundingBox.width()));
elementInfo->setString("nodeHeight", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetHeight(), *modelObject) : boundingBox.height()));
if (renderer->isRenderNamedFlowFragmentContainer()) {
RenderNamedFlowFragment* region = toRenderBlockFlow(renderer)->renderNamedFlowFragment();
if (region->isValid()) {
RenderFlowThread* flowThread = region->flowThread();
ASSERT(flowThread && flowThread->isRenderNamedFlowThread());
RefPtr<InspectorObject> regionFlowInfo = InspectorObject::create();
regionFlowInfo->setString("name", toRenderNamedFlowThread(flowThread)->flowThreadName());
regionFlowInfo->setArray("regions", buildObjectForCSSRegionsHighlight(region, flowThread));
elementInfo->setObject("regionFlowInfo", regionFlowInfo.release());
}
}
RenderFlowThread* containingFlowThread = renderer->flowThreadContainingBlock();
if (containingFlowThread && containingFlowThread->isRenderNamedFlowThread()) {
RefPtr<InspectorObject> contentFlowInfo = InspectorObject::create();
contentFlowInfo->setString("name", toRenderNamedFlowThread(containingFlowThread)->flowThreadName());
elementInfo->setObject("contentFlowInfo", contentFlowInfo.release());
}
#if ENABLE(CSS_SHAPES)
if (renderer->isBox()) {
RenderBox* renderBox = toRenderBox(renderer);
if (RefPtr<InspectorObject> shapeObject = buildObjectForShapeOutside(containingFrame, renderBox))
elementInfo->setObject("shapeOutsideInfo", shapeObject.release());
}
#endif
// Need to enable AX to get the computed role.
if (!WebCore::AXObjectCache::accessibilityEnabled())
WebCore::AXObjectCache::enableAccessibility();
if (AXObjectCache* axObjectCache = node->document().axObjectCache()) {
if (AccessibilityObject* axObject = axObjectCache->getOrCreate(node))
elementInfo->setString("role", axObject->computedRoleString());
}
return elementInfo.release();
}
RenderBlockFlow& RootInlineBox::blockFlow() const
{
return toRenderBlockFlow(renderer());
}
void RenderMultiColumnSet::paintColumnRules(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (paintInfo.context->paintingDisabled())
return;
RenderMultiColumnFlowThread* flowThread = toRenderBlockFlow(parent())->multiColumnFlowThread();
const RenderStyle& blockStyle = parent()->style();
const Color& ruleColor = blockStyle.visitedDependentColor(CSSPropertyWebkitColumnRuleColor);
bool ruleTransparent = blockStyle.columnRuleIsTransparent();
EBorderStyle ruleStyle = blockStyle.columnRuleStyle();
LayoutUnit ruleThickness = blockStyle.columnRuleWidth();
LayoutUnit colGap = columnGap();
bool renderRule = ruleStyle > BHIDDEN && !ruleTransparent;
if (!renderRule)
return;
unsigned colCount = columnCount();
if (colCount <= 1)
return;
bool antialias = shouldAntialiasLines(paintInfo.context);
if (flowThread->progressionIsInline()) {
bool leftToRight = style().isLeftToRightDirection() ^ flowThread->progressionIsReversed();
LayoutUnit currLogicalLeftOffset = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit ruleAdd = logicalLeftOffsetForContent();
LayoutUnit ruleLogicalLeft = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit inlineDirectionSize = computedColumnWidth();
BoxSide boxSide = isHorizontalWritingMode()
? leftToRight ? BSLeft : BSRight
: leftToRight ? BSTop : BSBottom;
for (unsigned i = 0; i < colCount; i++) {
// Move to the next position.
if (leftToRight) {
ruleLogicalLeft += inlineDirectionSize + colGap / 2;
currLogicalLeftOffset += inlineDirectionSize + colGap;
} else {
ruleLogicalLeft -= (inlineDirectionSize + colGap / 2);
currLogicalLeftOffset -= (inlineDirectionSize + colGap);
}
// Now paint the column rule.
if (i < colCount - 1) {
LayoutUnit ruleLeft = isHorizontalWritingMode() ? paintOffset.x() + ruleLogicalLeft - ruleThickness / 2 + ruleAdd : paintOffset.x() + borderLeft() + paddingLeft();
LayoutUnit ruleRight = isHorizontalWritingMode() ? ruleLeft + ruleThickness : ruleLeft + contentWidth();
LayoutUnit ruleTop = isHorizontalWritingMode() ? paintOffset.y() + borderTop() + paddingTop() : paintOffset.y() + ruleLogicalLeft - ruleThickness / 2 + ruleAdd;
LayoutUnit ruleBottom = isHorizontalWritingMode() ? ruleTop + contentHeight() : ruleTop + ruleThickness;
IntRect pixelSnappedRuleRect = pixelSnappedIntRectFromEdges(ruleLeft, ruleTop, ruleRight, ruleBottom);
drawLineForBoxSide(paintInfo.context, pixelSnappedRuleRect.x(), pixelSnappedRuleRect.y(), pixelSnappedRuleRect.maxX(), pixelSnappedRuleRect.maxY(), boxSide, ruleColor, ruleStyle, 0, 0, antialias);
}
ruleLogicalLeft = currLogicalLeftOffset;
}
} else {
bool topToBottom = !style().isFlippedBlocksWritingMode() ^ flowThread->progressionIsReversed();
LayoutUnit ruleLeft = isHorizontalWritingMode() ? LayoutUnit() : colGap / 2 - colGap - ruleThickness / 2;
LayoutUnit ruleWidth = isHorizontalWritingMode() ? contentWidth() : ruleThickness;
LayoutUnit ruleTop = isHorizontalWritingMode() ? colGap / 2 - colGap - ruleThickness / 2 : LayoutUnit();
LayoutUnit ruleHeight = isHorizontalWritingMode() ? ruleThickness : contentHeight();
LayoutRect ruleRect(ruleLeft, ruleTop, ruleWidth, ruleHeight);
if (!topToBottom) {
if (isHorizontalWritingMode())
ruleRect.setY(height() - ruleRect.maxY());
else
ruleRect.setX(width() - ruleRect.maxX());
}
ruleRect.moveBy(paintOffset);
BoxSide boxSide = isHorizontalWritingMode() ? topToBottom ? BSTop : BSBottom : topToBottom ? BSLeft : BSRight;
LayoutSize step(0, topToBottom ? computedColumnHeight() + colGap : -(computedColumnHeight() + colGap));
if (!isHorizontalWritingMode())
step = step.transposedSize();
for (unsigned i = 1; i < colCount; i++) {
ruleRect.move(step);
IntRect pixelSnappedRuleRect = pixelSnappedIntRect(ruleRect);
drawLineForBoxSide(paintInfo.context, pixelSnappedRuleRect.x(), pixelSnappedRuleRect.y(), pixelSnappedRuleRect.maxX(), pixelSnappedRuleRect.maxY(), boxSide, ruleColor, ruleStyle, 0, 0, antialias);
}
}
}
RenderLayer* RenderRegion::regionContainerLayer() const
{
ASSERT(parent() && parent()->isRenderNamedFlowFragmentContainer());
return toRenderBlockFlow(parent())->layer();
}
LayoutState::LayoutState(std::unique_ptr<LayoutState> next, RenderBox* renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
: m_columnInfo(columnInfo)
, m_lineGrid(0)
, m_next(std::move(next))
#if ENABLE(CSS_SHAPES)
, m_shapeInsideInfo(0)
#endif
#ifndef NDEBUG
, m_renderer(renderer)
#endif
{
ASSERT(m_next);
bool fixed = renderer->isOutOfFlowPositioned() && renderer->style().position() == FixedPosition;
if (fixed) {
// FIXME: This doesn't work correctly with transforms.
FloatPoint fixedOffset = renderer->view().localToAbsolute(FloatPoint(), IsFixed);
m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
} else
m_paintOffset = m_next->m_paintOffset + offset;
if (renderer->isOutOfFlowPositioned() && !fixed) {
if (RenderElement* container = renderer->container()) {
if (container->isInFlowPositioned() && container->isRenderInline())
m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(renderer);
}
}
m_layoutOffset = m_paintOffset;
if (renderer->isInFlowPositioned() && renderer->hasLayer())
m_paintOffset += renderer->layer()->offsetForInFlowPosition();
m_clipped = !fixed && m_next->m_clipped;
if (m_clipped)
m_clipRect = m_next->m_clipRect;
if (renderer->hasOverflowClip()) {
LayoutRect clipRect(toPoint(m_paintOffset) + renderer->view().layoutDelta(), renderer->cachedSizeForOverflowClip());
if (m_clipped)
m_clipRect.intersect(clipRect);
else {
m_clipRect = clipRect;
m_clipped = true;
}
m_paintOffset -= renderer->scrolledContentOffset();
}
// If we establish a new page height, then cache the offset to the top of the first page.
// We can compare this later on to figure out what part of the page we're actually on,
if (pageLogicalHeight || m_columnInfo || renderer->isRenderFlowThread()) {
m_pageLogicalHeight = pageLogicalHeight;
bool isFlipped = renderer->style().isFlippedBlocksWritingMode();
m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer->borderLeft() + renderer->paddingLeft() : renderer->borderRight() + renderer->paddingRight()),
m_layoutOffset.height() + (!isFlipped ? renderer->borderTop() + renderer->paddingTop() : renderer->borderBottom() + renderer->paddingBottom()));
m_pageLogicalHeightChanged = pageLogicalHeightChanged;
} else {
// If we don't establish a new page height, then propagate the old page height and offset down.
m_pageLogicalHeight = m_next->m_pageLogicalHeight;
m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
m_pageOffset = m_next->m_pageOffset;
// Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
// writing mode roots.
if (renderer->isUnsplittableForPagination())
m_pageLogicalHeight = 0;
}
// Propagate line grid information.
propagateLineGridInfo(renderer);
if (!m_columnInfo)
m_columnInfo = m_next->m_columnInfo;
#if ENABLE(CSS_SHAPES)
if (renderer->isRenderBlock()) {
const RenderBlock* renderBlock = toRenderBlock(renderer);
m_shapeInsideInfo = renderBlock->shapeInsideInfo();
if (!m_shapeInsideInfo && m_next->m_shapeInsideInfo && renderBlock->allowsShapeInsideInfoSharing())
m_shapeInsideInfo = m_next->m_shapeInsideInfo;
}
#endif
m_layoutDelta = m_next->m_layoutDelta;
#if !ASSERT_DISABLED && ENABLE(SATURATED_LAYOUT_ARITHMETIC)
m_layoutDeltaXSaturated = m_next->m_layoutDeltaXSaturated;
m_layoutDeltaYSaturated = m_next->m_layoutDeltaYSaturated;
#endif
m_isPaginated = m_pageLogicalHeight || m_columnInfo || renderer->isRenderFlowThread();
if (lineGrid() && renderer->hasColumns() && renderer->style().hasInlineColumnAxis())
computeLineGridPaginationOrigin(renderer);
// If we have a new grid to track, then add it to our set.
if (renderer->style().lineGrid() != RenderStyle::initialLineGrid() && renderer->isRenderBlockFlow())
establishLineGrid(toRenderBlockFlow(renderer));
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
RenderBlockFlow& RenderNamedFlowFragment::fragmentContainer() const
{
ASSERT(parent());
ASSERT(parent()->isRenderNamedFlowFragmentContainer());
return *toRenderBlockFlow(parent());
}
