LayoutRect LayoutMultiColumnSet::flowThreadPortionRect() const
{
LayoutRect portionRect(LayoutUnit(), logicalTopInFlowThread(), pageLogicalWidth(), logicalHeightInFlowThread());
if (!isHorizontalWritingMode())
return portionRect.transposedRect();
return portionRect;
}
void RenderRegion::layoutBlock(bool relayoutChildren, LayoutUnit)
{
StackStats::LayoutCheckPoint layoutCheckPoint;
RenderBlock::layoutBlock(relayoutChildren);
if (isValid()) {
LayoutRect oldRegionRect(flowThreadPortionRect());
if (!isHorizontalWritingMode())
oldRegionRect = oldRegionRect.transposedRect();
if (hasAutoLogicalHeight() && !m_flowThread->inConstrainedLayoutPhase()) {
m_flowThread->invalidateRegions();
clearOverrideLogicalContentHeight();
return;
}
if (!isRenderRegionSet() && (oldRegionRect.width() != pageLogicalWidth() || oldRegionRect.height() != pageLogicalHeight()))
// This can happen even if we are in the inConstrainedLayoutPhase and it will trigger a pathological layout of the flow thread.
m_flowThread->invalidateRegions();
}
// FIXME: We need to find a way to set up overflow properly. Our flow thread hasn't gotten a layout
// yet, so we can't look to it for correct information. It's possible we could wait until after the RenderFlowThread
// gets a layout, and then try to propagate overflow information back to the region, and then mark for a second layout.
// That second layout would then be able to use the information from the RenderFlowThread to set up overflow.
//
// The big problem though is that overflow needs to be region-specific. We can't simply use the RenderFlowThread's global
// overflow values, since then we'd always think any narrow region had huge overflow (all the way to the width of the
// RenderFlowThread itself).
//
// We'll need to expand RenderBoxRegionInfo to also hold left and right overflow values.
}
void RenderNamedFlowFragment::layoutBlock(bool relayoutChildren, LayoutUnit)
{
StackStats::LayoutCheckPoint layoutCheckPoint;
RenderRegion::layoutBlock(relayoutChildren);
if (isValid()) {
LayoutRect oldRegionRect(flowThreadPortionRect());
if (!isHorizontalWritingMode())
oldRegionRect = oldRegionRect.transposedRect();
if (m_flowThread->inOverflowLayoutPhase() || m_flowThread->inFinalLayoutPhase()) {
computeOverflowFromFlowThread();
updateOversetState();
}
if (hasAutoLogicalHeight() && m_flowThread->inMeasureContentLayoutPhase()) {
m_flowThread->invalidateRegions();
clearComputedAutoHeight();
return;
}
if ((oldRegionRect.width() != pageLogicalWidth() || oldRegionRect.height() != pageLogicalHeight()) && !m_flowThread->inFinalLayoutPhase())
// This can happen even if we are in the inConstrainedLayoutPhase and it will trigger a pathological layout of the flow thread.
m_flowThread->invalidateRegions();
}
}
void RenderMultiColumnSet::paintColumnRules(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (paintInfo.context->paintingDisabled())
return;
RenderStyle* blockStyle = multiColumnBlockFlow()->style();
const Color& ruleColor = resolveColor(blockStyle, 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 = actualColumnCount();
if (colCount <= 1)
return;
bool antialias = shouldAntialiasLines(paintInfo.context);
bool leftToRight = style()->isLeftToRightDirection();
LayoutUnit currLogicalLeftOffset = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit ruleAdd = borderAndPaddingLogicalLeft();
LayoutUnit ruleLogicalLeft = leftToRight ? LayoutUnit() : contentLogicalWidth();
LayoutUnit inlineDirectionSize = pageLogicalWidth();
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;
}
}
void RenderNamedFlowFragment::invalidateRegionIfNeeded()
{
if (!isValid())
return;
LayoutRect oldRegionRect(flowThreadPortionRect());
if (!isHorizontalWritingMode())
oldRegionRect = oldRegionRect.transposedRect();
if ((oldRegionRect.width() != pageLogicalWidth() || oldRegionRect.height() != pageLogicalHeight()) && !m_flowThread->inFinalLayoutPhase()) {
// This can happen even if we are in the inConstrainedLayoutPhase and it will trigger a pathological layout of the flow thread.
m_flowThread->invalidateRegions();
}
}
LayoutRect RenderMultiColumnSet::columnRectAt(unsigned index) const
{
LayoutUnit colLogicalWidth = pageLogicalWidth();
LayoutUnit colLogicalHeight = pageLogicalHeight();
LayoutUnit colLogicalTop = borderBefore() + paddingBefore();
LayoutUnit colLogicalLeft = borderAndPaddingLogicalLeft();
LayoutUnit colGap = columnGap();
if (style()->isLeftToRightDirection())
colLogicalLeft += index * (colLogicalWidth + colGap);
else
colLogicalLeft += contentLogicalWidth() - colLogicalWidth - index * (colLogicalWidth + colGap);
if (isHorizontalWritingMode())
return LayoutRect(colLogicalLeft, colLogicalTop, colLogicalWidth, colLogicalHeight);
return LayoutRect(colLogicalTop, colLogicalLeft, colLogicalHeight, colLogicalWidth);
}
void RenderMultiColumnSet::collectLayerFragments(LayerFragments& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect)
{
// The two rectangles passed to this method are physical, except that we pretend that there's
// only one long column (that's how a flow thread works).
//
// Then there's the output from this method - the stuff we put into the list of fragments. The
// fragment.paginationOffset point is the actual physical translation required to get from a
// location in the flow thread to a location in a given column. The fragment.paginationClip
// rectangle, on the other hand, is in the same coordinate system as the two rectangles passed
// to this method (flow thread coordinates).
//
// All other rectangles in this method are sized physically, and the inline direction coordinate
// is physical too, but the block direction coordinate is "logical top". This is the same as
// e.g. RenderBox::frameRect(). These rectangles also pretend that there's only one long column,
// i.e. they are for the flow thread.
// 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 = pageLogicalWidth();
LayoutUnit colGap = columnGap();
unsigned colCount = actualColumnCount();
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 = i * (colLogicalWidth + colGap);
if (!style()->isLeftToRightDirection())
inlineOffset = -inlineOffset;
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x();
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);
}
}
