case. + // Don't do this for a block that split two inlines though. You do + // still apply margins in this case. + setTopMarginQuirk(true); + } + + if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop)) + marginInfo.setTopQuirk(topQuirk); + + int ypos = height(); + if (child->isSelfCollapsingBlock()) { + // This child has no height. We need to compute our + // position before we collapse the child's margins together, + // so that we can get an accurate position for the zero-height block. + int collapsedTopPos = max(marginInfo.posMargin(), child->maxTopMargin(true)); + int collapsedTopNeg = max(marginInfo.negMargin(), child->maxTopMargin(false)); + marginInfo.setMargin(collapsedTopPos, collapsedTopNeg); + + // Now collapse the child's margins together, which means examining our + // bottom margin values as well. + marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true)); + marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false)); + + if (!marginInfo.canCollapseWithTop()) + // We need to make sure that the position of the self-collapsing block + // is correct, since it could have overflowing content + // that needs to be positioned correctly (e.g., a block that + // had a specified height of 0 but that actually had subcontent). + ypos = height() + collapsedTopPos - collapsedTopNeg; + } + else { + if (child->style()->marginTopCollapse() == MSEPARATE) { + setHeight(height() + marginInfo.margin() + child->marginTop()); + ypos = height(); + } + else if (!marginInfo.atTopOfBlock() || + (!marginInfo.canCollapseTopWithChildren() + && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) { + // We're collapsing with a previous sibling's margins and not + // with the top of the block. + setHeight(height() + max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop)); + ypos = height(); + } + + marginInfo.setPosMargin(child->maxBottomMargin(true)); + marginInfo.setNegMargin(child->maxBottomMargin(false)); + + if (marginInfo.margin()) + marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD); + } + + return ypos; +} + +int RenderBlock::clearFloatsIfNeeded(RenderBox* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin, int yPos) +{ + int heightIncrease = getClearDelta(child, yPos); + if (!heightIncrease) + return yPos; + + if (child->isSelfCollapsingBlock()) { + // For self-collapsing blocks that clear, they can still collapse their + // margins with following siblings. Reset the current margins to represent + // the self-collapsing block's margins only. + // CSS2.1 states: + // "An element that has had clearance applied to it never collapses its top margin with its parent block's bottom margin. + // Therefore if we are at the bottom of the block, let's go ahead and reset margins to only include the + // self-collapsing block's bottom margin. + bool atBottomOfBlock = true; + for (RenderBox* curr = child->nextSiblingBox(); curr && atBottomOfBlock; curr = curr->nextSiblingBox()) { + if (!curr->isFloatingOrPositioned()) + atBottomOfBlock = false; + } + if (atBottomOfBlock) { + marginInfo.setPosMargin(child->maxBottomMargin(true)); + marginInfo.setNegMargin(child->maxBottomMargin(false)); + } else { + marginInfo.setPosMargin(max(child->maxTopMargin(true), child->maxBottomMargin(true))); + marginInfo.setNegMargin(max(child->maxTopMargin(false), child->maxBottomMargin(false))); + } + + // Adjust our height such that we are ready to be collapsed with subsequent siblings (or the bottom + // of the parent block). + setHeight(child->y() - max(0, marginInfo.margin())); + } else + // Increase our height by the amount we had to clear. + setHeight(height() + heightIncrease); + + if (marginInfo.canCollapseWithTop()) { + // We can no longer collapse with the top of the block since a clear + // occurred. The empty blocks collapse into the cleared block. + // FIXME: This isn't quite correct. Need clarification for what to do + // if the height the cleared block is offset by is smaller than the + // margins involved. + setMaxTopMargins(oldTopPosMargin, oldTopNegMargin); + marginInfo.setAtTopOfBlock(false); + } + + return yPos + heightIncrease; +} + +int RenderBlock::estimateVerticalPosition(RenderBox* child, const MarginInfo& marginInfo) +{ + // FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological + // relayout if there are intruding floats. + int yPosEstimate = height(); + if (!marginInfo.canCollapseWithTop()) { + int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop(); + yPosEstimate += max(marginInfo.margin(), childMarginTop); + } + yPosEstimate += getClearDelta(child, yPosEstimate); + return yPosEstimate; +} + +void RenderBlock::determineHorizontalPosition(RenderBox* child) +{ + int xPos = borderLeft() + paddingLeft(); + if (style()->direction() == LTR) { + // Add in our left margin. + int chPos = xPos + child->marginLeft(); + + // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need + // to shift over as necessary to dodge any floats that might get in the way. + if (child->avoidsFloats()) { + int leftOff = leftOffset(height(), false); + if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginLeft().type() != Auto) { + if (child->marginLeft() < 0) + leftOff += child->marginLeft(); + chPos = max(chPos, leftOff); // Let the float sit in the child's margin if it can fit. + } + else if (leftOff != xPos) { + // The object is shifting right. The object might be centered, so we need to + // recalculate our horizontal margins. Note that the containing block content + // width computation will take into account the delta between |leftOff| and |xPos| + // so that we can just pass the content width in directly to the |calcHorizontalMargins| + // function. + child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false)); + chPos = leftOff + child->marginLeft(); + } + } + view()->addLayoutDelta(IntSize(child->x() - chPos, 0)); + child->setLocation(chPos, child->y()); + } else { + xPos += availableWidth(); + int chPos = xPos - (child->width() + child->marginRight()); + if (child->avoidsFloats()) { + int rightOff = rightOffset(height(), false); + if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginRight().type() != Auto) { + if (child->marginRight() < 0) + rightOff -= child->marginRight(); + chPos = min(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit. + } else if (rightOff != xPos) { + // The object is shifting left. The object might be centered, so we need to + // recalculate our horizontal margins. Note that the containing block content + // width computation will take into account the delta between |rightOff| and |xPos| + // so that we can just pass the content width in directly to the |calcHorizontalMargins| + // function. + child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false)); + chPos = rightOff - child->marginRight() - child->width(); + } + } + view()->addLayoutDelta(IntSize(child->x() - chPos, 0)); + child->setLocation(chPos, child->y()); + } +} + +void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo) +{ + if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) { + // Update our max pos/neg bottom margins, since we collapsed our bottom margins + // with our children. + setMaxBottomMargins(max(maxBottomPosMargin(), marginInfo.posMargin()), max(maxBottomNegMargin(), marginInfo.negMargin())); + + if (!marginInfo.bottomQuirk()) + setBottomMarginQuirk(false); + + if (marginInfo.bottomQuirk() && marginBottom() == 0) + // We have no bottom margin and our last child has a quirky margin. + // We will pick up this quirky margin and pass it through. + // This deals with the

case. + setBottomMarginQuirk(true); + } +} + +void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo) +{ + marginInfo.setAtBottomOfBlock(true); + + // If we can't collapse with children then go ahead and add in the bottom margin. + if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop() + && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk())) + setHeight(height() + marginInfo.margin()); + + // Now add in our bottom border/padding. + setHeight(height() + bottom); + + // Negative margins can cause our height to shrink below our minimal height (border/padding). + // If this happens, ensure that the computed height is increased to the minimal height. + setHeight(max(height(), top + bottom)); + + // Update our bottom collapsed margin info. + setCollapsedBottomMargin(marginInfo); +} + +void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom) +{ + if (gPercentHeightDescendantsMap) { + if (HashSet* descendants = gPercentHeightDescendantsMap->get(this)) { + HashSet::iterator end = descendants->end(); + for (HashSet::iterator it = descendants->begin(); it != end; ++it) { + RenderBox* box = *it; + while (box != this) { + if (box->normalChildNeedsLayout()) + break; + box->setChildNeedsLayout(true, false); + box = box->containingBlock(); + ASSERT(box); + if (!box) + break; + } + } + } + } + + int top = borderTop() + paddingTop(); + int bottom = borderBottom() + paddingBottom() + horizontalScrollbarHeight(); + + setHeight(top); + + // The margin struct caches all our current margin collapsing state. The compact struct caches state when we encounter compacts, + MarginInfo marginInfo(this, top, bottom); + + // Fieldsets need to find their legend and position it inside the border of the object. + // The legend then gets skipped during normal layout. + RenderObject* legend = layoutLegend(relayoutChildren); + + int previousFloatBottom = 0; + maxFloatBottom = 0; + + RenderBox* next = firstChildBox(); + + while (next) { + RenderBox* child = next; + next = child->nextSiblingBox(); + + if (legend == child) + continue; // Skip the legend, since it has already been positioned up in the fieldset's border. + + // Make sure we layout children if they need it. + // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into + // an auto value. Add a method to determine this, so that we can avoid the relayout. + if (relayoutChildren || ((child->style()->height().isPercent() || child->style()->minHeight().isPercent() || child->style()->maxHeight().isPercent()) && !isRenderView())) + child->setChildNeedsLayout(true, false); + + // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths. + if (relayoutChildren && (child->style()->paddingLeft().isPercent() || child->style()->paddingRight().isPercent())) + child->setPrefWidthsDirty(true, false); + + // Handle the four types of special elements first. These include positioned content, floating content, compacts and + // run-ins. When we encounter these four types of objects, we don't actually lay them out as normal flow blocks. + if (handleSpecialChild(child, marginInfo)) + continue; + + // Lay out the child. + layoutBlockChild(child, marginInfo, previousFloatBottom, maxFloatBottom); + } + + // Now do the handling of the bottom of the block, adding in our bottom border/padding and + // determining the correct collapsed bottom margin information. + handleBottomOfBlock(top, bottom, marginInfo); +} + +void RenderBlock::layoutBlockChild(RenderBox* child, MarginInfo& marginInfo, int& previousFloatBottom, int& maxFloatBottom) +{ + int oldTopPosMargin = maxTopPosMargin(); + int oldTopNegMargin = maxTopNegMargin(); + + // The child is a normal flow object. Compute its vertical margins now. + child->calcVerticalMargins(); + + // Do not allow a collapse if the margin top collapse style is set to SEPARATE. + if (child->style()->marginTopCollapse() == MSEPARATE) { + marginInfo.setAtTopOfBlock(false); + marginInfo.clearMargin(); + } + + // Try to guess our correct y position. In most cases this guess will + // be correct. Only if we're wrong (when we compute the real y position) + // will we have to potentially relayout. + int yPosEstimate = estimateVerticalPosition(child, marginInfo); + + // Cache our old rect so that we can dirty the proper repaint rects if the child moves. + IntRect oldRect(child->x(), child->y() , child->width(), child->height()); +#ifndef NDEBUG + IntSize oldLayoutDelta = view()->layoutDelta(); +#endif + // Go ahead and position the child as though it didn't collapse with the top. + view()->addLayoutDelta(IntSize(0, child->y() - yPosEstimate)); + child->setLocation(child->x(), yPosEstimate); + + bool markDescendantsWithFloats = false; + if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && child->isBlockFlow() && toRenderBlock(child)->containsFloats()) + markDescendantsWithFloats = true; + else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) { + // If an element might be affected by the presence of floats, then always mark it for + // layout. + int fb = max(previousFloatBottom, floatBottom()); + if (fb > yPosEstimate) + markDescendantsWithFloats = true; + } + + if (child->isRenderBlock()) { + if (markDescendantsWithFloats) + toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(); + + previousFloatBottom = max(previousFloatBottom, oldRect.y() + toRenderBlock(child)->floatBottom()); + } + + bool childHadLayout = child->m_everHadLayout; + bool childNeededLayout = child->needsLayout(); + if (childNeededLayout) + child->layout(); + + // Now determine the correct ypos based off examination of collapsing margin + // values. + int yBeforeClear = collapseMargins(child, marginInfo); + + // Now check for clear. + int yAfterClear = clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin, yBeforeClear); + + view()->addLayoutDelta(IntSize(0, yPosEstimate - yAfterClear)); + child->setLocation(child->x(), yAfterClear); + + // Now we have a final y position. See if it really does end up being different from our estimate. + if (yAfterClear != yPosEstimate) { + if (child->shrinkToAvoidFloats()) { + // The child's width depends on the line width. + // When the child shifts to clear an item, its width can + // change (because it has more available line width). + // So go ahead and mark the item as dirty. + child->setChildNeedsLayout(true, false); + } + if (!child->avoidsFloats() && child->isBlockFlow() && toRenderBlock(child)->containsFloats()) + toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(); + // Our guess was wrong. Make the child lay itself out again. + child->layoutIfNeeded(); + } + + // We are no longer at the top of the block if we encounter a non-empty child. + // This has to be done after checking for clear, so that margins can be reset if a clear occurred. + if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock()) + marginInfo.setAtTopOfBlock(false); + + // Now place the child in the correct horizontal position + determineHorizontalPosition(child); + + // Update our height now that the child has been placed in the correct position. + setHeight(height() + child->height()); + if (child->style()->marginBottomCollapse() == MSEPARATE) { + setHeight(height() + child->marginBottom()); + marginInfo.clearMargin(); + } + // If the child has overhanging floats that intrude into following siblings (or possibly out + // of this block), then the parent gets notified of the floats now. + if (child->isBlockFlow() && toRenderBlock(child)->containsFloats()) + maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(toRenderBlock(child), -child->x(), -child->y(), !childNeededLayout)); + + IntSize childOffset(child->x() - oldRect.x(), child->y() - oldRect.y()); + if (childOffset.width() || childOffset.height()) { + view()->addLayoutDelta(childOffset); + + // 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 (childHadLayout && !selfNeedsLayout() && child->checkForRepaintDuringLayout()) + child->repaintDuringLayoutIfMoved(oldRect); + } + + if (!childHadLayout && child->checkForRepaintDuringLayout()) { + child->repaint(); + child->repaintOverhangingFloats(true); + } + + ASSERT(oldLayoutDelta == view()->layoutDelta()); +} + +bool RenderBlock::layoutOnlyPositionedObjects() +{ + if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout()) + return false; + + LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection()); + + if (needsPositionedMovementLayout()) { + tryLayoutDoingPositionedMovementOnly(); + if (needsLayout()) + return false; + } + + // All we have to is lay out our positioned objects. + layoutPositionedObjects(false); + + statePusher.pop(); + + updateScrollInfoAfterLayout(); + + setNeedsLayout(false); + return true; +} + +void RenderBlock::layoutPositionedObjects(bool relayoutChildren) +{ + if (m_positionedObjects) { + RenderBox* r; + Iterator end = m_positionedObjects->end(); + for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { + r = *it; + // When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the + // non-positioned block. Rather than trying to detect all of these movement cases, we just always lay out positioned + // objects that are positioned implicitly like this. Such objects are rare, and so in typical DHTML menu usage (where everything is + // positioned explicitly) this should not incur a performance penalty. + if (relayoutChildren || (r->style()->hasStaticY() && r->parent() != this && r->parent()->isBlockFlow())) + r->setChildNeedsLayout(true, false); + + // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths. + //if (relayoutChildren && (r->style()->paddingLeft().isPercent() || r->style()->paddingRight().isPercent())) + r->setPrefWidthsDirty(true, false); + + // We don't have to do a full layout. We just have to update our position. Try that first. If we have shrink-to-fit width + // and we hit the available width constraint, the layoutIfNeeded() will catch it and do a full layout. + if (r->needsPositionedMovementLayoutOnly()) + r->tryLayoutDoingPositionedMovementOnly(); + r->layoutIfNeeded(); + } + } +} + +void RenderBlock::markPositionedObjectsForLayout() +{ + if (m_positionedObjects) { + RenderBox* r; + Iterator end = m_positionedObjects->end(); + for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { + r = *it; + r->setChildNeedsLayout(true); + } + } +} + +void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants) +{ + // Repaint any overhanging floats (if we know we're the one to paint them). + if (hasOverhangingFloats()) { + // We think that we must be in a bad state if m_floatingObjects is nil at this point, so + // we assert on Debug builds and nil-check Release builds. + ASSERT(m_floatingObjects); + if (!m_floatingObjects) + return; + + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + + // FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating + // in this block. Better yet would be to push extra state for the containers of other floats. + view()->disableLayoutState(); + for ( ; (r = it.current()); ++it) { + // Only repaint the object if it is overhanging, is not in its own layer, and + // is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter + // condition is replaced with being a descendant of us. + if (r->m_bottom > height() && ((paintAllDescendants && r->m_renderer->isDescendantOf(this)) || r->m_shouldPaint) && !r->m_renderer->hasSelfPaintingLayer()) { + r->m_renderer->repaint(); + r->m_renderer->repaintOverhangingFloats(); + } + } + view()->enableLayoutState(); + } +} + +void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty) +{ + tx += x(); + ty += y(); + + PaintPhase phase = paintInfo.phase; + + // Check if we need to do anything at all. + // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView + // paints the root's background. + if (!isRoot()) { + IntRect overflowBox = visibleOverflowRect(); + overflowBox.inflate(maximalOutlineSize(paintInfo.phase)); + overflowBox.move(tx, ty); + if (!overflowBox.intersects(paintInfo.rect)) + return; + } + + bool pushedClip = pushContentsClip(paintInfo, tx, ty); + paintObject(paintInfo, tx, ty); + if (pushedClip) + popContentsClip(paintInfo, phase, tx, ty); + + // Our scrollbar widgets paint exactly when we tell them to, so that they work properly with + // z-index. We paint after we painted the background/border, so that the scrollbars will + // sit above the background/border. + if (hasOverflowClip() && style()->visibility() == VISIBLE && (phase == PaintPhaseBlockBackground || phase == PaintPhaseChildBlockBackground) && paintInfo.shouldPaintWithinRoot(this)) + layer()->paintOverflowControls(paintInfo.context, tx, ty, paintInfo.rect); +} + +void RenderBlock::paintColumnRules(PaintInfo& paintInfo, int tx, int ty) +{ + const Color& ruleColor = style()->visitedDependentColor(CSSPropertyWebkitColumnRuleColor); + bool ruleTransparent = style()->columnRuleIsTransparent(); + EBorderStyle ruleStyle = style()->columnRuleStyle(); + int ruleWidth = style()->columnRuleWidth(); + int colGap = columnGap(); + bool renderRule = ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap; + if (!renderRule) + return; + + // We need to do multiple passes, breaking up our child painting into strips. + Vector* colRects = columnRects(); + unsigned colCount = colRects->size(); + int currXOffset = style()->direction() == LTR ? 0 : contentWidth(); + int ruleAdd = borderLeft() + paddingLeft(); + int ruleX = style()->direction() == LTR ? 0 : contentWidth(); + for (unsigned i = 0; i < colCount; i++) { + IntRect colRect = colRects->at(i); + + // Move to the next position. + if (style()->direction() == LTR) { + ruleX += colRect.width() + colGap / 2; + currXOffset += colRect.width() + colGap; + } else { + ruleX -= (colRect.width() + colGap / 2); + currXOffset -= (colRect.width() + colGap); + } + + // Now paint the column rule. + if (i < colCount - 1) { + int ruleStart = tx + ruleX - ruleWidth / 2 + ruleAdd; + int ruleEnd = ruleStart + ruleWidth; + int ruleTop = ty + borderTop() + paddingTop(); + int ruleBottom = ruleTop + contentHeight(); + drawLineForBoxSide(paintInfo.context, ruleStart, ruleTop, ruleEnd, ruleBottom, + style()->direction() == LTR ? BSLeft : BSRight, ruleColor, ruleStyle, 0, 0); + } + + ruleX = currXOffset; + } +} + +void RenderBlock::paintColumnContents(PaintInfo& paintInfo, int tx, int ty, bool paintingFloats) +{ + // We need to do multiple passes, breaking up our child painting into strips. + GraphicsContext* context = paintInfo.context; + int colGap = columnGap(); + Vector* colRects = columnRects(); + unsigned colCount = colRects->size(); + if (!colCount) + return; + int currXOffset = style()->direction() == LTR ? 0 : contentWidth() - colRects->at(0).width(); + int currYOffset = 0; + for (unsigned i = 0; i < colCount; i++) { + // For each rect, we clip to the rect, and then we adjust our coords. + IntRect colRect = colRects->at(i); + colRect.move(tx, ty); + PaintInfo info(paintInfo); + info.rect.intersect(colRect); + + if (!info.rect.isEmpty()) { + context->save(); + + // Each strip pushes a clip, since column boxes are specified as being + // like overflow:hidden. + context->clip(colRect); + + // Adjust our x and y when painting. + int finalX = tx + currXOffset; + int finalY = ty + currYOffset; + if (paintingFloats) + paintFloats(info, finalX, finalY, paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip); + else + paintContents(info, finalX, finalY); + + context->restore(); + } + + // Move to the next position. + if (style()->direction() == LTR) + currXOffset += colRect.width() + colGap; + else + currXOffset -= (colRect.width() + colGap); + + currYOffset -= colRect.height(); + } +} + +void RenderBlock::paintContents(PaintInfo& paintInfo, int tx, int ty) +{ + // Avoid painting descendants of the root element when stylesheets haven't loaded. This eliminates FOUC. + // It's ok not to draw, because later on, when all the stylesheets do load, updateStyleSelector on the Document + // will do a full repaint(). + if (document()->didLayoutWithPendingStylesheets() && !isRenderView()) + return; + + if (childrenInline()) + m_lineBoxes.paint(this, paintInfo, tx, ty); + else + paintChildren(paintInfo, tx, ty); +} + +void RenderBlock::paintChildren(PaintInfo& paintInfo, int tx, int ty) +{ + PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase; + newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase; + + // We don't paint our own background, but we do let the kids paint their backgrounds. + PaintInfo info(paintInfo); + info.phase = newPhase; + info.updatePaintingRootForChildren(this); + bool checkPageBreaks = document()->printing() && !document()->settings()->paginateDuringLayoutEnabled(); + bool checkColumnBreaks = !checkPageBreaks && !view()->printRect().isEmpty() && !document()->settings()->paginateDuringLayoutEnabled(); + + for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { + // Check for page-break-before: always, and if it's set, break and bail. + bool checkBeforeAlways = !childrenInline() && ((checkPageBreaks && child->style()->pageBreakBefore() == PBALWAYS) || (checkColumnBreaks && child->style()->columnBreakBefore() == PBALWAYS)); + if (checkBeforeAlways + && (ty + child->y()) > paintInfo.rect.y() + && (ty + child->y()) < paintInfo.rect.bottom()) { + view()->setBestTruncatedAt(ty + child->y(), this, true); + return; + } + + if (!child->hasSelfPaintingLayer() && !child->isFloating()) + child->paint(info, tx, ty); + + // Check for page-break-after: always, and if it's set, break and bail. + bool checkAfterAlways = !childrenInline() && ((checkPageBreaks && child->style()->pageBreakAfter() == PBALWAYS) || (checkColumnBreaks && child->style()->columnBreakAfter() == PBALWAYS)); + if (checkAfterAlways + && (ty + child->y() + child->height()) > paintInfo.rect.y() + && (ty + child->y() + child->height()) < paintInfo.rect.bottom()) { + view()->setBestTruncatedAt(ty + child->y() + child->height() + max(0, child->collapsedMarginBottom()), this, true); + return; + } + } +} + +void RenderBlock::paintCaret(PaintInfo& paintInfo, int tx, int ty, CaretType type) +{ + SelectionController* selection = type == CursorCaret ? frame()->selection() : frame()->dragCaretController(); + + // Paint the caret if the SelectionController says so or if caret browsing is enabled + bool caretBrowsing = frame()->settings() && frame()->settings()->caretBrowsingEnabled(); + RenderObject* caretPainter = selection->caretRenderer(); + if (caretPainter == this && (selection->isContentEditable() || caretBrowsing)) { + // Convert the painting offset into the local coordinate system of this renderer, + // to match the localCaretRect computed by the SelectionController + offsetForContents(tx, ty); + + if (type == CursorCaret) + frame()->selection()->paintCaret(paintInfo.context, tx, ty, paintInfo.rect); + else + frame()->paintDragCaret(paintInfo.context, tx, ty, paintInfo.rect); + } +} + +void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty) +{ + PaintPhase paintPhase = paintInfo.phase; + + // 1. paint background, borders etc + if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && style()->visibility() == VISIBLE) { + if (hasBoxDecorations()) + paintBoxDecorations(paintInfo, tx, ty); + if (hasColumns()) + paintColumnRules(paintInfo, tx, ty); + } + + if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) { + paintMask(paintInfo, tx, ty); + return; + } + + // We're done. We don't bother painting any children. + if (paintPhase == PaintPhaseBlockBackground) + return; + + // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div). + int scrolledX = tx; + int scrolledY = ty; + if (hasOverflowClip()) { + IntSize offset = layer()->scrolledContentOffset(); + scrolledX -= offset.width(); + scrolledY -= offset.height(); + } + + // 2. paint contents + if (paintPhase != PaintPhaseSelfOutline) { + if (hasColumns()) + paintColumnContents(paintInfo, scrolledX, scrolledY); + else + paintContents(paintInfo, scrolledX, scrolledY); + } + + // 3. paint selection + // FIXME: Make this work with multi column layouts. For now don't fill gaps. + bool isPrinting = document()->printing(); + if (!isPrinting && !hasColumns()) + paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks. + + // 4. paint floats. + if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip) { + if (hasColumns()) + paintColumnContents(paintInfo, scrolledX, scrolledY, true); + else + paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip); + } + + // 5. paint outline. + if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE) + paintOutline(paintInfo.context, tx, ty, width(), height()); + + // 6. paint continuation outlines. + if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) { + RenderInline* inlineCont = inlineElementContinuation(); + if (inlineCont && inlineCont->hasOutline() && inlineCont->style()->visibility() == VISIBLE) { + RenderInline* inlineRenderer = toRenderInline(inlineCont->node()->renderer()); + RenderBlock* cb = containingBlock(); + + bool inlineEnclosedInSelfPaintingLayer = false; + for (RenderBoxModelObject* box = inlineRenderer; box != cb; box = box->parent()->enclosingBoxModelObject()) { + if (box->hasSelfPaintingLayer()) { + inlineEnclosedInSelfPaintingLayer = true; + break; + } + } + + if (!inlineEnclosedInSelfPaintingLayer) + cb->addContinuationWithOutline(inlineRenderer); + else if (!inlineRenderer->firstLineBox()) + inlineRenderer->paintOutline(paintInfo.context, tx - x() + inlineRenderer->containingBlock()->x(), + ty - y() + inlineRenderer->containingBlock()->y()); + } + paintContinuationOutlines(paintInfo, tx, ty); + } + + // 7. paint caret. + // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground, + // then paint the caret. + if (paintPhase == PaintPhaseForeground) { + paintCaret(paintInfo, scrolledX, scrolledY, CursorCaret); + paintCaret(paintInfo, scrolledX, scrolledY, DragCaret); + } +} + +void RenderBlock::paintFloats(PaintInfo& paintInfo, int tx, int ty, bool preservePhase) +{ + if (!m_floatingObjects) + return; + + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for (; (r = it.current()); ++it) { + // Only paint the object if our m_shouldPaint flag is set. + if (r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer()) { + PaintInfo currentPaintInfo(paintInfo); + currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground; + int currentTX = tx + r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft(); + int currentTY = ty + r->m_top - r->m_renderer->y() + r->m_renderer->marginTop(); + r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); + if (!preservePhase) { + currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds; + r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); + currentPaintInfo.phase = PaintPhaseFloat; + r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); + currentPaintInfo.phase = PaintPhaseForeground; + r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); + currentPaintInfo.phase = PaintPhaseOutline; + r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); + } + } + } +} + +void RenderBlock::paintEllipsisBoxes(PaintInfo& paintInfo, int tx, int ty) +{ + if (!paintInfo.shouldPaintWithinRoot(this) || !firstLineBox()) + return; + + if (style()->visibility() == VISIBLE && paintInfo.phase == PaintPhaseForeground) { + // We can check the first box and last box and avoid painting if we don't + // intersect. + int yPos = ty + firstLineBox()->y(); + int h = lastLineBox()->y() + lastLineBox()->height() - firstLineBox()->y(); + if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y()) + return; + + // See if our boxes intersect with the dirty rect. If so, then we paint + // them. Note that boxes can easily overlap, so we can't make any assumptions + // based off positions of our first line box or our last line box. + for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) { + yPos = ty + curr->y(); + h = curr->height(); + if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y()) + curr->paintEllipsisBox(paintInfo, tx, ty); + } + } +} + +RenderInline* RenderBlock::inlineElementContinuation() const +{ + return m_continuation && m_continuation->isInline() ? toRenderInline(m_continuation) : 0; +} + +RenderBlock* RenderBlock::blockElementContinuation() const +{ + if (!m_continuation || m_continuation->isInline()) + return 0; + RenderBlock* nextContinuation = toRenderBlock(m_continuation); + if (nextContinuation->isAnonymousBlock()) + return nextContinuation->blockElementContinuation(); + return nextContinuation; +} + +static ContinuationOutlineTableMap* continuationOutlineTable() +{ + DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ()); + return &table; +} + +void RenderBlock::addContinuationWithOutline(RenderInline* flow) +{ + // We can't make this work if the inline is in a layer. We'll just rely on the broken + // way of painting. + ASSERT(!flow->layer() && !flow->isInlineElementContinuation()); + + ContinuationOutlineTableMap* table = continuationOutlineTable(); + ListHashSet* continuations = table->get(this); + if (!continuations) { + continuations = new ListHashSet; + table->set(this, continuations); + } + + continuations->add(flow); +} + +void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty) +{ + ContinuationOutlineTableMap* table = continuationOutlineTable(); + if (table->isEmpty()) + return; + + ListHashSet* continuations = table->get(this); + if (!continuations) + return; + + // Paint each continuation outline. + ListHashSet::iterator end = continuations->end(); + for (ListHashSet::iterator it = continuations->begin(); it != end; ++it) { + // Need to add in the coordinates of the intervening blocks. + RenderInline* flow = *it; + RenderBlock* block = flow->containingBlock(); + for ( ; block && block != this; block = block->containingBlock()) { + tx += block->x(); + ty += block->y(); + } + ASSERT(block); + flow->paintOutline(info.context, tx, ty); + } + + // Delete + delete continuations; + table->remove(this); +} + +bool RenderBlock::shouldPaintSelectionGaps() const +{ + return selectionState() != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot(); +} + +bool RenderBlock::isSelectionRoot() const +{ + if (!node()) + return false; + + // FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases. + if (isTable()) + return false; + + if (isBody() || isRoot() || hasOverflowClip() || isRelPositioned() || + isFloatingOrPositioned() || isTableCell() || isInlineBlockOrInlineTable() || hasTransform() || + hasReflection() || hasMask()) + return true; + + if (view() && view()->selectionStart()) { + Node* startElement = view()->selectionStart()->node(); + if (startElement && startElement->rootEditableElement() == node()) + return true; + } + + return false; +} + +GapRects RenderBlock::selectionGapRectsForRepaint(RenderBoxModelObject* repaintContainer) +{ + ASSERT(!needsLayout()); + + if (!shouldPaintSelectionGaps()) + return GapRects(); + + // FIXME: this is broken with transforms + TransformState transformState(TransformState::ApplyTransformDirection, FloatPoint()); + mapLocalToContainer(repaintContainer, false, false, transformState); + IntPoint offsetFromRepaintContainer = roundedIntPoint(transformState.mappedPoint()); + + if (hasOverflowClip()) + offsetFromRepaintContainer -= layer()->scrolledContentOffset(); + + int lastTop = 0; + int lastLeft = leftSelectionOffset(this, lastTop); + int lastRight = rightSelectionOffset(this, lastTop); + + return fillSelectionGaps(this, offsetFromRepaintContainer.x(), offsetFromRepaintContainer.y(), offsetFromRepaintContainer.x(), offsetFromRepaintContainer.y(), lastTop, lastLeft, lastRight); +} + +void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty) +{ + if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) { + int lastTop = 0; + int lastLeft = leftSelectionOffset(this, lastTop); + int lastRight = rightSelectionOffset(this, lastTop); + paintInfo.context->save(); + IntRect gapRectsBounds = fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo); + if (!gapRectsBounds.isEmpty()) { + if (RenderLayer* layer = enclosingLayer()) { + gapRectsBounds.move(IntSize(-tx, -ty)); + if (!hasLayer()) { + FloatRect localBounds(gapRectsBounds); + gapRectsBounds = localToContainerQuad(localBounds, layer->renderer()).enclosingBoundingBox(); + gapRectsBounds.move(layer->scrolledContentOffset()); + } + layer->addBlockSelectionGapsBounds(gapRectsBounds); + } + } + paintInfo.context->restore(); + } +} + +#ifndef BUILDING_ON_TIGER +static void clipOutPositionedObjects(const PaintInfo* paintInfo, int tx, int ty, RenderBlock::PositionedObjectsListHashSet* positionedObjects) +{ + if (!positionedObjects) + return; + + RenderBlock::PositionedObjectsListHashSet::const_iterator end = positionedObjects->end(); + for (RenderBlock::PositionedObjectsListHashSet::const_iterator it = positionedObjects->begin(); it != end; ++it) { + RenderBox* r = *it; + paintInfo->context->clipOut(IntRect(tx + r->x(), ty + r->y(), r->width(), r->height())); + } +} +#endif + +GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, + int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) +{ +#ifndef BUILDING_ON_TIGER + // IMPORTANT: Callers of this method that intend for painting to happen need to do a save/restore. + // Clip out floating and positioned objects when painting selection gaps. + if (paintInfo) { + // Note that we don't clip out overflow for positioned objects. We just stick to the border box. + clipOutPositionedObjects(paintInfo, tx, ty, m_positionedObjects); + if (isBody() || isRoot()) // The must make sure to examine its containingBlock's positioned objects. + for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock()) + clipOutPositionedObjects(paintInfo, cb->x(), cb->y(), cb->m_positionedObjects); + if (m_floatingObjects) { + for (DeprecatedPtrListIterator it(*m_floatingObjects); it.current(); ++it) { + FloatingObject* r = it.current(); + paintInfo->context->clipOut(IntRect(tx + r->m_left + r->m_renderer->marginLeft(), + ty + r->m_top + r->m_renderer->marginTop(), + r->m_renderer->width(), r->m_renderer->height())); + } + } + } +#endif + + // FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is + // fixed). + GapRects result; + if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday. + return result; + + if (hasColumns() || hasTransform() || style()->columnSpan()) { + // FIXME: We should learn how to gap fill multiple columns and transforms eventually. + lastTop = (ty - blockY) + height(); + lastLeft = leftSelectionOffset(rootBlock, height()); + lastRight = rightSelectionOffset(rootBlock, height()); + return result; + } + + if (childrenInline()) + result = fillInlineSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo); + else + result = fillBlockSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo); + + // Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block. + if (rootBlock == this && (selectionState() != SelectionBoth && selectionState() != SelectionEnd)) + result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height(), + rootBlock, blockX, blockY, paintInfo)); + return result; +} + +GapRects RenderBlock::fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, + int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) +{ + GapRects result; + + bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth; + + if (!firstLineBox()) { + if (containsStart) { + // Go ahead and update our lastY to be the bottom of the block.

s or empty blocks with height can trip this + // case. + lastTop = (ty - blockY) + height(); + lastLeft = leftSelectionOffset(rootBlock, height()); + lastRight = rightSelectionOffset(rootBlock, height()); + } + return result; + } + + RootInlineBox* lastSelectedLine = 0; + RootInlineBox* curr; + for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { } + + // Now paint the gaps for the lines. + for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) { + int selTop = curr->selectionTop(); + int selHeight = curr->selectionHeight(); + + if (!containsStart && !lastSelectedLine && + selectionState() != SelectionStart && selectionState() != SelectionBoth) + result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + selTop, + rootBlock, blockX, blockY, paintInfo)); + + if (!paintInfo || (ty + selTop < paintInfo->rect.bottom() && ty + selTop + selHeight > paintInfo->rect.y())) + result.unite(curr->fillLineSelectionGap(selTop, selHeight, rootBlock, blockX, blockY, tx, ty, paintInfo)); + + lastSelectedLine = curr; + } + + if (containsStart && !lastSelectedLine) + // VisibleSelection must start just after our last line. + lastSelectedLine = lastRootBox(); + + if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) { + // Go ahead and update our lastY to be the bottom of the last selected line. + lastTop = (ty - blockY) + lastSelectedLine->selectionBottom(); + lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->selectionBottom()); + lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->selectionBottom()); + } + return result; +} + +GapRects RenderBlock::fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, + int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) +{ + GapRects result; + + // Go ahead and jump right to the first block child that contains some selected objects. + RenderBox* curr; + for (curr = firstChildBox(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSiblingBox()) { } + + for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) { + SelectionState childState = curr->selectionState(); + if (childState == SelectionBoth || childState == SelectionEnd) + sawSelectionEnd = true; + + if (curr->isFloatingOrPositioned()) + continue; // We must be a normal flow object in order to even be considered. + + if (curr->isRelPositioned() && curr->hasLayer()) { + // If the relposition offset is anything other than 0, then treat this just like an absolute positioned element. + // Just disregard it completely. + IntSize relOffset = curr->layer()->relativePositionOffset(); + if (relOffset.width() || relOffset.height()) + continue; + } + + bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this. + bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone); + if (fillBlockGaps) { + // We need to fill the vertical gap above this object. + if (childState == SelectionEnd || childState == SelectionInside) + // Fill the gap above the object. + result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, + ty + curr->y(), rootBlock, blockX, blockY, paintInfo)); + + // Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past* + // our object. We know this if the selection did not end inside our object. + if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd)) + childState = SelectionNone; + + // Fill side gaps on this object based off its state. + bool leftGap, rightGap; + getHorizontalSelectionGapInfo(childState, leftGap, rightGap); + + if (leftGap) + result.uniteLeft(fillLeftSelectionGap(this, curr->x(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo)); + if (rightGap) + result.uniteRight(fillRightSelectionGap(this, curr->x() + curr->width(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo)); + + // Update lastTop to be just underneath the object. lastLeft and lastRight extend as far as + // they can without bumping into floating or positioned objects. Ideally they will go right up + // to the border of the root selection block. + lastTop = (ty - blockY) + (curr->y() + curr->height()); + lastLeft = leftSelectionOffset(rootBlock, curr->y() + curr->height()); + lastRight = rightSelectionOffset(rootBlock, curr->y() + curr->height()); + } else if (childState != SelectionNone) + // We must be a block that has some selected object inside it. Go ahead and recur. + result.unite(toRenderBlock(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->x(), ty + curr->y(), + lastTop, lastLeft, lastRight, paintInfo)); + } + return result; +} + +IntRect RenderBlock::fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo* paintInfo) +{ + if (width <= 0 || height <= 0) + return IntRect(); + IntRect gapRect(xPos, yPos, width, height); + if (paintInfo && selObj->style()->visibility() == VISIBLE) + paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor(), selObj->style()->colorSpace()); + return gapRect; +} + +IntRect RenderBlock::fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock, + int blockX, int blockY, const PaintInfo* paintInfo) +{ + int top = blockY + lastTop; + int height = bottomY - top; + if (height <= 0) + return IntRect(); + + // Get the selection offsets for the bottom of the gap + int left = blockX + max(lastLeft, leftSelectionOffset(rootBlock, bottomY)); + int right = blockX + min(lastRight, rightSelectionOffset(rootBlock, bottomY)); + int width = right - left; + if (width <= 0) + return IntRect(); + + IntRect gapRect(left, top, width, height); + if (paintInfo) + paintInfo->context->fillRect(gapRect, selectionBackgroundColor(), style()->colorSpace()); + return gapRect; +} + +IntRect RenderBlock::fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, + int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo) +{ + int top = yPos + ty; + int left = blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height)); + int right = min(xPos + tx, blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height))); + int width = right - left; + if (width <= 0) + return IntRect(); + + IntRect gapRect(left, top, width, height); + if (paintInfo) + paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor(), selObj->style()->colorSpace()); + return gapRect; +} + +IntRect RenderBlock::fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, + int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo) +{ + int left = max(xPos + tx, blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height))); + int top = yPos + ty; + int right = blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height)); + int width = right - left; + if (width <= 0) + return IntRect(); + + IntRect gapRect(left, top, width, height); + if (paintInfo) + paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor(), selObj->style()->colorSpace()); + return gapRect; +} + +void RenderBlock::getHorizontalSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap) +{ + bool ltr = style()->direction() == LTR; + leftGap = (state == RenderObject::SelectionInside) || + (state == RenderObject::SelectionEnd && ltr) || + (state == RenderObject::SelectionStart && !ltr); + rightGap = (state == RenderObject::SelectionInside) || + (state == RenderObject::SelectionStart && ltr) || + (state == RenderObject::SelectionEnd && !ltr); +} + +int RenderBlock::leftSelectionOffset(RenderBlock* rootBlock, int yPos) +{ + int left = leftOffset(yPos, false); + if (left == borderLeft() + paddingLeft()) { + if (rootBlock != this) + // The border can potentially be further extended by our containingBlock(). + return containingBlock()->leftSelectionOffset(rootBlock, yPos + y()); + return left; + } + else { + RenderBlock* cb = this; + while (cb != rootBlock) { + left += cb->x(); + cb = cb->containingBlock(); + } + } + + return left; +} + +int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int yPos) +{ + int right = rightOffset(yPos, false); + if (right == (contentWidth() + (borderLeft() + paddingLeft()))) { + if (rootBlock != this) + // The border can potentially be further extended by our containingBlock(). + return containingBlock()->rightSelectionOffset(rootBlock, yPos + y()); + return right; + } + else { + RenderBlock* cb = this; + while (cb != rootBlock) { + right += cb->x(); + cb = cb->containingBlock(); + } + } + return right; +} + +void RenderBlock::insertPositionedObject(RenderBox* o) +{ + // Create the list of special objects if we don't aleady have one + if (!m_positionedObjects) + m_positionedObjects = new PositionedObjectsListHashSet; + + m_positionedObjects->add(o); +} + +void RenderBlock::removePositionedObject(RenderBox* o) +{ + if (m_positionedObjects) + m_positionedObjects->remove(o); +} + +void RenderBlock::removePositionedObjects(RenderBlock* o) +{ + if (!m_positionedObjects) + return; + + RenderBox* r; + + Iterator end = m_positionedObjects->end(); + + Vector deadObjects; + + for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { + r = *it; + if (!o || r->isDescendantOf(o)) { + if (o) + r->setChildNeedsLayout(true, false); + + // It is parent blocks job to add positioned child to positioned objects list of its containing block + // Parent layout needs to be invalidated to ensure this happens. + RenderObject* p = r->parent(); + while (p && !p->isRenderBlock()) + p = p->parent(); + if (p) + p->setChildNeedsLayout(true); + + deadObjects.append(r); + } + } + + for (unsigned i = 0; i < deadObjects.size(); i++) + m_positionedObjects->remove(deadObjects.at(i)); +} + +void RenderBlock::insertFloatingObject(RenderBox* o) +{ + ASSERT(o->isFloating()); + + // Create the list of special objects if we don't aleady have one + if (!m_floatingObjects) { + m_floatingObjects = new DeprecatedPtrList; + m_floatingObjects->setAutoDelete(true); + } else { + // Don't insert the object again if it's already in the list + DeprecatedPtrListIterator it(*m_floatingObjects); + FloatingObject* f; + while ( (f = it.current()) ) { + if (f->m_renderer == o) return; + ++it; + } + } + + // Create the special object entry & append it to the list + + o->layoutIfNeeded(); + + FloatingObject* newObj = new FloatingObject(o->style()->floating() == FLEFT ? FloatingObject::FloatLeft : FloatingObject::FloatRight); + + newObj->m_top = -1; + newObj->m_bottom = -1; + newObj->m_width = o->width() + o->marginLeft() + o->marginRight(); + newObj->m_shouldPaint = !o->hasSelfPaintingLayer(); // If a layer exists, the float will paint itself. Otherwise someone else will. + newObj->m_isDescendant = true; + newObj->m_renderer = o; + + m_floatingObjects->append(newObj); +} + +void RenderBlock::removeFloatingObject(RenderBox* o) +{ + if (m_floatingObjects) { + DeprecatedPtrListIterator it(*m_floatingObjects); + while (it.current()) { + if (it.current()->m_renderer == o) { + if (childrenInline()) { + int bottom = it.current()->m_bottom; + // Special-case zero- and less-than-zero-height floats: those don't touch + // the line that they're on, but it still needs to be dirtied. This is + // accomplished by pretending they have a height of 1. + bottom = max(bottom, it.current()->m_top + 1); + markLinesDirtyInVerticalRange(0, bottom); + } + m_floatingObjects->removeRef(it.current()); + } + ++it; + } + } +} + +bool RenderBlock::positionNewFloats() +{ + if (!m_floatingObjects) + return false; + + FloatingObject* f = m_floatingObjects->last(); + + // If all floats have already been positioned, then we have no work to do. + if (!f || f->m_top != -1) + return false; + + // Move backwards through our floating object list until we find a float that has + // already been positioned. Then we'll be able to move forward, positioning all of + // the new floats that need it. + FloatingObject* lastFloat = m_floatingObjects->getPrev(); + while (lastFloat && lastFloat->m_top == -1) { + f = m_floatingObjects->prev(); + lastFloat = m_floatingObjects->getPrev(); + } + + int y = height(); + + // The float cannot start above the y position of the last positioned float. + if (lastFloat) + y = max(lastFloat->m_top, y); + + // Now walk through the set of unpositioned floats and place them. + while (f) { + // The containing block is responsible for positioning floats, so if we have floats in our + // list that come from somewhere else, do not attempt to position them. + if (f->m_renderer->containingBlock() != this) { + f = m_floatingObjects->next(); + continue; + } + + RenderBox* o = f->m_renderer; + int _height = o->height() + o->marginTop() + o->marginBottom(); + + int ro = rightOffset(); // Constant part of right offset. + int lo = leftOffset(); // Constat part of left offset. + int fwidth = f->m_width; // The width we look for. + if (ro - lo < fwidth) + fwidth = ro - lo; // Never look for more than what will be available. + + IntRect oldRect(o->x(), o->y() , o->width(), o->height()); + + if (o->style()->clear() & CLEFT) + y = max(leftBottom(), y); + if (o->style()->clear() & CRIGHT) + y = max(rightBottom(), y); + + if (o->style()->floating() == FLEFT) { + int heightRemainingLeft = 1; + int heightRemainingRight = 1; + int fx = leftRelOffset(y, lo, false, &heightRemainingLeft); + while (rightRelOffset(y, ro, false, &heightRemainingRight)-fx < fwidth) { + y += min(heightRemainingLeft, heightRemainingRight); + fx = leftRelOffset(y, lo, false, &heightRemainingLeft); + } + fx = max(0, fx); + f->m_left = fx; + o->setLocation(fx + o->marginLeft(), y + o->marginTop()); + } else { + int heightRemainingLeft = 1; + int heightRemainingRight = 1; + int fx = rightRelOffset(y, ro, false, &heightRemainingRight); + while (fx - leftRelOffset(y, lo, false, &heightRemainingLeft) < fwidth) { + y += min(heightRemainingLeft, heightRemainingRight); + fx = rightRelOffset(y, ro, false, &heightRemainingRight); + } + f->m_left = fx - f->m_width; + o->setLocation(fx - o->marginRight() - o->width(), y + o->marginTop()); + } + + f->m_top = y; + f->m_bottom = f->m_top + _height; + + // If the child moved, we have to repaint it. + if (o->checkForRepaintDuringLayout()) + o->repaintDuringLayoutIfMoved(oldRect); + + f = m_floatingObjects->next(); + } + return true; +} + +void RenderBlock::newLine(EClear clear) +{ + positionNewFloats(); + // set y position + int newY = 0; + switch (clear) + { + case CLEFT: + newY = leftBottom(); + break; + case CRIGHT: + newY = rightBottom(); + break; + case CBOTH: + newY = floatBottom(); + default: + break; + } + if (height() < newY) + setHeight(newY); +} + +void RenderBlock::addPercentHeightDescendant(RenderBox* descendant) +{ + if (!gPercentHeightDescendantsMap) { + gPercentHeightDescendantsMap = new PercentHeightDescendantsMap; + gPercentHeightContainerMap = new PercentHeightContainerMap; + } + + HashSet* descendantSet = gPercentHeightDescendantsMap->get(this); + if (!descendantSet) { + descendantSet = new HashSet; + gPercentHeightDescendantsMap->set(this, descendantSet); + } + bool added = descendantSet->add(descendant).second; + if (!added) { + ASSERT(gPercentHeightContainerMap->get(descendant)); + ASSERT(gPercentHeightContainerMap->get(descendant)->contains(this)); + return; + } + + HashSet* containerSet = gPercentHeightContainerMap->get(descendant); + if (!containerSet) { + containerSet = new HashSet; + gPercentHeightContainerMap->set(descendant, containerSet); + } + ASSERT(!containerSet->contains(this)); + containerSet->add(this); +} + +void RenderBlock::removePercentHeightDescendant(RenderBox* descendant) +{ + if (!gPercentHeightContainerMap) + return; + + HashSet* containerSet = gPercentHeightContainerMap->take(descendant); + if (!containerSet) + return; + + HashSet::iterator end = containerSet->end(); + for (HashSet::iterator it = containerSet->begin(); it != end; ++it) { + RenderBlock* container = *it; + HashSet* descendantSet = gPercentHeightDescendantsMap->get(container); + ASSERT(descendantSet); + if (!descendantSet) + continue; + ASSERT(descendantSet->contains(descendant)); + descendantSet->remove(descendant); + if (descendantSet->isEmpty()) { + gPercentHeightDescendantsMap->remove(container); + delete descendantSet; + } + } + + delete containerSet; +} + +HashSet* RenderBlock::percentHeightDescendants() const +{ + return gPercentHeightDescendantsMap ? gPercentHeightDescendantsMap->get(this) : 0; +} + +int RenderBlock::leftOffset() const +{ + return borderLeft() + paddingLeft(); +} + +int RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const +{ + int left = fixedOffset; + if (m_floatingObjects) { + if ( heightRemaining ) *heightRemaining = 1; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + { + if (r->m_top <= y && r->m_bottom > y && + r->type() == FloatingObject::FloatLeft && + r->m_left + r->m_width > left) { + left = r->m_left + r->m_width; + if ( heightRemaining ) *heightRemaining = r->m_bottom - y; + } + } + } + + if (applyTextIndent && style()->direction() == LTR) { + int cw = 0; + if (style()->textIndent().isPercent()) + cw = containingBlock()->availableWidth(); + left += style()->textIndent().calcMinValue(cw); + } + + return left; +} + +int RenderBlock::rightOffset() const +{ + return borderLeft() + paddingLeft() + availableWidth(); +} + +int RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const +{ + int right = fixedOffset; + + if (m_floatingObjects) { + if (heightRemaining) *heightRemaining = 1; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + { + if (r->m_top <= y && r->m_bottom > y && + r->type() == FloatingObject::FloatRight && + r->m_left < right) { + right = r->m_left; + if ( heightRemaining ) *heightRemaining = r->m_bottom - y; + } + } + } + + if (applyTextIndent && style()->direction() == RTL) { + int cw = 0; + if (style()->textIndent().isPercent()) + cw = containingBlock()->availableWidth(); + right -= style()->textIndent().calcMinValue(cw); + } + + return right; +} + +int +RenderBlock::lineWidth(int y, bool firstLine) const +{ + int result = rightOffset(y, firstLine) - leftOffset(y, firstLine); + return (result < 0) ? 0 : result; +} + +int RenderBlock::nextFloatBottomBelow(int height) const +{ + if (!m_floatingObjects) + return 0; + + int bottom = INT_MAX; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it) { + if (r->m_bottom > height) + bottom = min(r->m_bottom, bottom); + } + + return bottom == INT_MAX ? 0 : bottom; +} + +int +RenderBlock::floatBottom() const +{ + if (!m_floatingObjects) return 0; + int bottom = 0; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + if (r->m_bottom>bottom) + bottom = r->m_bottom; + return bottom; +} + +int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int bottom = includeSelf && width() > 0 ? height() : 0; + + if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) + return bottom; + + if (!firstChild() && (!width() || !height())) + return bottom; + + if (!hasColumns()) { + // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. + // For now, we have to descend into all the children, since we may have a huge abs div inside + // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to + // the abs div. + // See the last test case in https://bugs.webkit.org/show_bug.cgi?id=9314 for why this is a problem. + // For inline children, we miss relative positioned boxes that might be buried inside s. + for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { + if (!c->isFloatingOrPositioned() && c->isBox()) { + RenderBox* childBox = toRenderBox(c); + bottom = max(bottom, childBox->y() + childBox->lowestPosition(false)); + } + } + } + + if (includeSelf && isRelPositioned()) + bottom += relativePositionOffsetY(); + if (!includeOverflowInterior && hasOverflowClip()) + return bottom; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetY() : 0; + + if (includeSelf) + bottom = max(bottom, bottomLayoutOverflow() + relativeOffset); + + if (m_positionedObjects) { + RenderBox* r; + Iterator end = m_positionedObjects->end(); + for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { + r = *it; + // Fixed positioned objects do not scroll and thus should not constitute + // part of the lowest position. + if (r->style()->position() != FixedPosition) { + // FIXME: Should work for overflow sections too. + // If a positioned object lies completely to the left of the root it will be unreachable via scrolling. + // Therefore we should not allow it to contribute to the lowest position. + if (!isRenderView() || r->x() + r->width() > 0 || r->x() + r->rightmostPosition(false) > 0) { + int lp = r->y() + r->lowestPosition(false); + bottom = max(bottom, lp + relativeOffset); + } + } + } + } + + if (hasColumns()) { + Vector* colRects = columnRects(); + for (unsigned i = 0; i < colRects->size(); i++) + bottom = max(bottom, colRects->at(i).bottom() + relativeOffset); + return bottom; + } + + if (m_floatingObjects) { + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { + int lp = r->m_top + r->m_renderer->marginTop() + r->m_renderer->lowestPosition(false); + bottom = max(bottom, lp + relativeOffset); + } + } + } + + if (!includeSelf) { + bottom = max(bottom, borderTop() + paddingTop() + paddingBottom() + relativeOffset); + if (childrenInline()) { + if (lastRootBox()) { + int childBottomEdge = lastRootBox()->selectionBottom(); + bottom = max(bottom, childBottomEdge + paddingBottom() + relativeOffset); + } + } else { + // Find the last normal flow child. + RenderBox* currBox = lastChildBox(); + while (currBox && currBox->isFloatingOrPositioned()) + currBox = currBox->previousSiblingBox(); + if (currBox) { + int childBottomEdge = currBox->y() + currBox->height() + currBox->collapsedMarginBottom(); + bottom = max(bottom, childBottomEdge + paddingBottom() + relativeOffset); + } + } + } + + return bottom; +} + +int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int right = includeSelf && height() > 0 ? width() : 0; + + if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) + return right; + + if (!firstChild() && (!width() || !height())) + return right; + + if (!hasColumns()) { + // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. + // For now, we have to descend into all the children, since we may have a huge abs div inside + // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to + // the abs div. + for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { + if (!c->isFloatingOrPositioned() && c->isBox()) { + RenderBox* childBox = toRenderBox(c); + right = max(right, childBox->x() + childBox->rightmostPosition(false)); + } + } + } + + if (includeSelf && isRelPositioned()) + right += relativePositionOffsetX(); + + if (!includeOverflowInterior && hasOverflowClip()) + return right; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; + + if (includeSelf) + right = max(right, rightLayoutOverflow() + relativeOffset); + + if (m_positionedObjects) { + RenderBox* r; + Iterator end = m_positionedObjects->end(); + for (Iterator it = m_positionedObjects->begin() ; it != end; ++it) { + r = *it; + // Fixed positioned objects do not scroll and thus should not constitute + // part of the rightmost position. + if (r->style()->position() != FixedPosition) { + // FIXME: Should work for overflow sections too. + // If a positioned object lies completely above the root it will be unreachable via scrolling. + // Therefore we should not allow it to contribute to the rightmost position. + if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) { + int rp = r->x() + r->rightmostPosition(false); + right = max(right, rp + relativeOffset); + } + } + } + } + + if (hasColumns()) { + // This only matters for LTR + if (style()->direction() == LTR) + right = max(columnRects()->last().right() + relativeOffset, right); + return right; + } + + if (m_floatingObjects) { + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { + int rp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->rightmostPosition(false); + right = max(right, rp + relativeOffset); + } + } + } + + if (!includeSelf) { + right = max(right, borderLeft() + paddingLeft() + paddingRight() + relativeOffset); + if (childrenInline()) { + for (InlineFlowBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) { + int childRightEdge = currBox->x() + currBox->width(); + + // If this node is a root editable element, then the rightmostPosition should account for a caret at the end. + // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to. + if (node() && node()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR && !paddingRight()) + childRightEdge += 1; + right = max(right, childRightEdge + paddingRight() + relativeOffset); + } + } else { + // Walk all normal flow children. + for (RenderBox* currBox = firstChildBox(); currBox; currBox = currBox->nextSiblingBox()) { + if (currBox->isFloatingOrPositioned()) + continue; + int childRightEdge = currBox->x() + currBox->width() + currBox->marginRight(); + right = max(right, childRightEdge + paddingRight() + relativeOffset); + } + } + } + + return right; +} + +int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int left = includeSelf && height() > 0 ? 0 : width(); + + if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) + return left; + + if (!firstChild() && (!width() || !height())) + return left; + + if (!hasColumns()) { + // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. + // For now, we have to descend into all the children, since we may have a huge abs div inside + // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to + // the abs div. + for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { + if (!c->isFloatingOrPositioned() && c->isBox()) { + RenderBox* childBox = toRenderBox(c); + left = min(left, childBox->x() + childBox->leftmostPosition(false)); + } + } + } + + if (includeSelf && isRelPositioned()) + left += relativePositionOffsetX(); + + if (!includeOverflowInterior && hasOverflowClip()) + return left; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; + + if (includeSelf) + left = min(left, leftLayoutOverflow() + relativeOffset); + + if (m_positionedObjects) { + RenderBox* r; + Iterator end = m_positionedObjects->end(); + for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { + r = *it; + // Fixed positioned objects do not scroll and thus should not constitute + // part of the leftmost position. + if (r->style()->position() != FixedPosition) { + // FIXME: Should work for overflow sections too. + // If a positioned object lies completely above the root it will be unreachable via scrolling. + // Therefore we should not allow it to contribute to the leftmost position. + if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) { + int lp = r->x() + r->leftmostPosition(false); + left = min(left, lp + relativeOffset); + } + } + } + } + + if (hasColumns()) { + // This only matters for RTL + if (style()->direction() == RTL) + left = min(columnRects()->last().x() + relativeOffset, left); + return left; + } + + if (m_floatingObjects) { + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { + int lp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->leftmostPosition(false); + left = min(left, lp + relativeOffset); + } + } + } + + if (!includeSelf && firstLineBox()) { + for (InlineFlowBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) + left = min(left, (int)currBox->x() + relativeOffset); + } + + return left; +} + +int +RenderBlock::leftBottom() +{ + if (!m_floatingObjects) return 0; + int bottom = 0; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + if (r->m_bottom > bottom && r->type() == FloatingObject::FloatLeft) + bottom = r->m_bottom; + + return bottom; +} + +int +RenderBlock::rightBottom() +{ + if (!m_floatingObjects) return 0; + int bottom = 0; + FloatingObject* r; + DeprecatedPtrListIterator it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + if (r->m_bottom>bottom && r->type() == FloatingObject::FloatRight) + bottom = r->m_bottom; + + return bottom; +} + +void RenderBlock::markLinesDirtyInVerticalRange(int top, int bottom, RootInlineBox* highest) +{ + if (top >= bottom) + return; + + RootInlineBox* lowestDirtyLine = lastRootBox(); + RootInlineBox* afterLowest = lowestDirtyLine; + while (lowestDirtyLine && lowestDirtyLine->blockHeight() >= bottom) { + afterLowest = lowestDirtyLine; + lowestDirtyLine = lowestDirtyLine->prevRootBox(); + } + + while (afterLowest && afterLowest != highest && afterLowest->blockHeight() >= top) { + afterLowest->markDirty(); + afterLowest = afterLowest->prevRootBox(); + } +} + +void RenderBlock::clearFloats() +{ + // Inline blocks are covered by the isReplaced() check in the avoidFloats method. + if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrPositioned() || isTableCell()) { + if (m_floatingObjects) + m_floatingObjects->clear(); + return; + } + + typedef HashMap RendererToFloatInfoMap; + RendererToFloatInfoMap floatMap; + + if (m_floatingObjects) { + if (childrenInline()) { + m_floatingObjects->first(); + while (FloatingObject* f = m_floatingObjects->take()) + floatMap.add(f->m_renderer, f); + } else + m_floatingObjects->clear(); + } + + // We should not process floats if the parent node is not a RenderBlock. Otherwise, we will add + // floats in an invalid context. This will cause a crash arising from a bad cast on the parent. + // See , where float property is applied on a text node in a SVG. + if (!parent() || !parent()->isRenderBlock()) + return; + + // Attempt to locate a previous sibling with overhanging floats. We skip any elements that are + // out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted + // to avoid floats. + bool parentHasFloats = false; + RenderObject* prev = previousSibling(); + while (prev && (prev->isFloatingOrPositioned() || !prev->isBox() || !prev->isRenderBlock() || toRenderBlock(prev)->avoidsFloats())) { + if (prev->isFloating()) + parentHasFloats = true; + prev = prev->previousSibling(); + } + + // First add in floats from the parent. + int offset = y(); + if (parentHasFloats) { + RenderBlock* parentBlock = toRenderBlock(parent()); + addIntrudingFloats(parentBlock, parentBlock->borderLeft() + parentBlock->paddingLeft(), offset); + } + + int xoffset = 0; + if (prev) + offset -= toRenderBox(prev)->y(); + else if (parent()->isBox()) { + prev = parent(); + xoffset += toRenderBox(prev)->borderLeft() + toRenderBox(prev)->paddingLeft(); + } + + // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space. + if (!prev || !prev->isRenderBlock()) + return; + + RenderBlock* block = toRenderBlock(prev); + if (block->m_floatingObjects && block->floatBottom() > offset) + addIntrudingFloats(block, xoffset, offset); + + if (childrenInline()) { + int changeTop = numeric_limits::max(); + int changeBottom = numeric_limits::min(); + if (m_floatingObjects) { + for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) { + FloatingObject* oldFloatingObject = floatMap.get(f->m_renderer); + if (oldFloatingObject) { + if (f->m_width != oldFloatingObject->m_width || f->m_left != oldFloatingObject->m_left) { + changeTop = 0; + changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom)); + } else if (f->m_bottom != oldFloatingObject->m_bottom) { + changeTop = min(changeTop, min(f->m_bottom, oldFloatingObject->m_bottom)); + changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom)); + } + + floatMap.remove(f->m_renderer); + delete oldFloatingObject; + } else { + changeTop = 0; + changeBottom = max(changeBottom, f->m_bottom); + } + } + } + + RendererToFloatInfoMap::iterator end = floatMap.end(); + for (RendererToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) { + FloatingObject* floatingObject = (*it).second; + if (!floatingObject->m_isDescendant) { + changeTop = 0; + changeBottom = max(changeBottom, floatingObject->m_bottom); + } + } + deleteAllValues(floatMap); + + markLinesDirtyInVerticalRange(changeTop, changeBottom); + } +} + +int RenderBlock::addOverhangingFloats(RenderBlock* child, int xoff, int yoff, bool makeChildPaintOtherFloats) +{ + // Prevent floats from being added to the canvas by the root element, e.g., . + if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot()) + return 0; + + int lowestFloatBottom = 0; + + // Floats that will remain the child's responsibility to paint should factor into its + // overflow. + DeprecatedPtrListIterator it(*child->m_floatingObjects); + for (FloatingObject* r; (r = it.current()); ++it) { + int bottom = child->y() + r->m_bottom; + lowestFloatBottom = max(lowestFloatBottom, bottom); + + if (bottom > height()) { + // If the object is not in the list, we add it now. + if (!containsFloat(r->m_renderer)) { + FloatingObject *floatingObj = new FloatingObject(r->type()); + floatingObj->m_top = r->m_top - yoff; + floatingObj->m_bottom = r->m_bottom - yoff; + floatingObj->m_left = r->m_left - xoff; + floatingObj->m_width = r->m_width; + floatingObj->m_renderer = r->m_renderer; + + // The nearest enclosing layer always paints the float (so that zindex and stacking + // behaves properly). We always want to propagate the desire to paint the float as + // far out as we can, to the outermost block that overlaps the float, stopping only + // if we hit a self-painting layer boundary. + if (r->m_renderer->enclosingSelfPaintingLayer() == enclosingSelfPaintingLayer()) + r->m_shouldPaint = false; + else + floatingObj->m_shouldPaint = false; + + // We create the floating object list lazily. + if (!m_floatingObjects) { + m_floatingObjects = new DeprecatedPtrList; + m_floatingObjects->setAutoDelete(true); + } + m_floatingObjects->append(floatingObj); + } + } else if (makeChildPaintOtherFloats && !r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer() && + r->m_renderer->isDescendantOf(child) && r->m_renderer->enclosingLayer() == child->enclosingLayer()) + // The float is not overhanging from this block, so if it is a descendant of the child, the child should + // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing + // layer. + // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats + // it should paint. + r->m_shouldPaint = true; + + if (r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer()) + child->addOverflowFromChild(r->m_renderer, IntSize(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop())); + } + return lowestFloatBottom; +} + +void RenderBlock::addIntrudingFloats(RenderBlock* prev, int xoff, int yoff) +{ + // If the parent or previous sibling doesn't have any floats to add, don't bother. + if (!prev->m_floatingObjects) + return; + + DeprecatedPtrListIterator it(*prev->m_floatingObjects); + for (FloatingObject *r; (r = it.current()); ++it) { + if (r->m_bottom > yoff) { + // The object may already be in our list. Check for it up front to avoid + // creating duplicate entries. + FloatingObject* f = 0; + if (m_floatingObjects) { + DeprecatedPtrListIterator it(*m_floatingObjects); + while ((f = it.current())) { + if (f->m_renderer == r->m_renderer) break; + ++it; + } + } + if (!f) { + FloatingObject *floatingObj = new FloatingObject(r->type()); + floatingObj->m_top = r->m_top - yoff; + floatingObj->m_bottom = r->m_bottom - yoff; + floatingObj->m_left = r->m_left - xoff; + // Applying the child's margin makes no sense in the case where the child was passed in. + // since his own margin was added already through the subtraction of the |xoff| variable + // above. |xoff| will equal -flow->marginLeft() in this case, so it's already been taken + // into account. Only apply this code if |child| is false, since otherwise the left margin + // will get applied twice. + if (prev != parent()) + floatingObj->m_left += prev->marginLeft(); + floatingObj->m_left -= marginLeft(); + floatingObj->m_shouldPaint = false; // We are not in the direct inheritance chain for this float. We will never paint it. + floatingObj->m_width = r->m_width; + floatingObj->m_renderer = r->m_renderer; + + // We create the floating object list lazily. + if (!m_floatingObjects) { + m_floatingObjects = new DeprecatedPtrList; + m_floatingObjects->setAutoDelete(true); + } + m_floatingObjects->append(floatingObj); + } + } + } +} + +bool RenderBlock::avoidsFloats() const +{ + // Floats can't intrude into our box if we have a non-auto column count or width. + return RenderBox::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth(); +} + +bool RenderBlock::containsFloat(RenderObject* o) +{ + if (m_floatingObjects) { + DeprecatedPtrListIterator it(*m_floatingObjects); + while (it.current()) { + if (it.current()->m_renderer == o) + return true; + ++it; + } + } + return false; +} + +void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove, bool inLayout) +{ + setChildNeedsLayout(true, !inLayout); + + if (floatToRemove) + removeFloatingObject(floatToRemove); + + // Iterate over our children and mark them as needed. + if (!childrenInline()) { + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if ((!floatToRemove && child->isFloatingOrPositioned()) || !child->isRenderBlock()) + continue; + RenderBlock* childBlock = toRenderBlock(child); + if ((floatToRemove ? childBlock->containsFloat(floatToRemove) : childBlock->containsFloats()) || childBlock->shrinkToAvoidFloats()) + childBlock->markAllDescendantsWithFloatsForLayout(floatToRemove, inLayout); + } + } +} + +int RenderBlock::visibleTopOfHighestFloatExtendingBelow(int bottom, int maxHeight) const +{ + int top = bottom; + if (m_floatingObjects) { + FloatingObject* floatingObject; + for (DeprecatedPtrListIterator it(*m_floatingObjects); (floatingObject = it.current()); ++it) { + RenderBox* floatingBox = floatingObject->m_renderer; + IntRect visibleOverflow = floatingBox->visibleOverflowRect(); + visibleOverflow.move(floatingBox->x(), floatingBox->y()); + if (visibleOverflow.y() < top && visibleOverflow.bottom() > bottom && visibleOverflow.height() <= maxHeight && floatingBox->containingBlock() == this) + top = visibleOverflow.y(); + } + } + + if (!childrenInline()) { + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if (child->isFloatingOrPositioned() || !child->isRenderBlock()) + continue; + RenderBlock* childBlock = toRenderBlock(child); + top = min(top, childBlock->y() + childBlock->visibleTopOfHighestFloatExtendingBelow(bottom - childBlock->y(), maxHeight)); + } + } + + return top; +} + +int RenderBlock::getClearDelta(RenderBox* child, int yPos) +{ + // There is no need to compute clearance if we have no floats. + if (!containsFloats()) + return 0; + + // At least one float is present. We need to perform the clearance computation. + bool clearSet = child->style()->clear() != CNONE; + int bottom = 0; + switch (child->style()->clear()) { + case CNONE: + break; + case CLEFT: + bottom = leftBottom(); + break; + case CRIGHT: + bottom = rightBottom(); + break; + case CBOTH: + bottom = floatBottom(); + break; + } + + // We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default). + int result = clearSet ? max(0, bottom - yPos) : 0; + if (!result && child->avoidsFloats()) { + int availableWidth = this->availableWidth(); + if (child->minPrefWidth() > availableWidth) + return 0; + + int y = yPos; + while (true) { + int widthAtY = lineWidth(y, false); + if (widthAtY == availableWidth) + return y - yPos; + + int oldChildY = child->y(); + int oldChildWidth = child->width(); + child->setY(y); + child->calcWidth(); + int childWidthAtY = child->width(); + child->setY(oldChildY); + child->setWidth(oldChildWidth); + + if (childWidthAtY <= widthAtY) + return y - yPos; + + y = nextFloatBottomBelow(y); + ASSERT(y >= yPos); + if (y < yPos) + break; + } + ASSERT_NOT_REACHED(); + } + return result; +} + +bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int _x, int _y, int _tx, int _ty) +{ + if (!scrollsOverflow()) + return false; + + return layer()->hitTestOverflowControls(result, IntPoint(_x - _tx, _y - _ty)); +} + +bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction) +{ + int tx = _tx + x(); + int ty = _ty + y(); + + if (!isRenderView()) { + // Check if we need to do anything at all. + IntRect overflowBox = visibleOverflowRect(); + overflowBox.move(tx, ty); + if (!overflowBox.intersects(result.rectFromPoint(_x, _y))) + return false; + } + + if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) && isPointInOverflowControl(result, _x, _y, tx, ty)) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); + // FIXME: isPointInOverflowControl() doesn't handle rect-based tests yet. + if (!result.addNodeToRectBasedTestResult(node(), _x, _y)) + return true; + } + + // If we have clipping, then we can't have any spillout. + bool useOverflowClip = hasOverflowClip() && !hasSelfPaintingLayer(); + bool useClip = (hasControlClip() || useOverflowClip); + IntRect hitTestArea(result.rectFromPoint(_x, _y)); + bool checkChildren = !useClip || (hasControlClip() ? controlClipRect(tx, ty).intersects(hitTestArea) : overflowClipRect(tx, ty).intersects(hitTestArea)); + if (checkChildren) { + // Hit test descendants first. + int scrolledX = tx; + int scrolledY = ty; + if (hasOverflowClip()) { + IntSize offset = layer()->scrolledContentOffset(); + scrolledX -= offset.width(); + scrolledY -= offset.height(); + } + + // Hit test contents if we don't have columns. + if (!hasColumns() && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); + return true; + } + + // Hit test our columns if we do have them. + if (hasColumns() && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); + return true; + } + + // Hit test floats. + if (hitTestAction == HitTestFloat && m_floatingObjects) { + if (isRenderView()) { + scrolledX += toRenderView(this)->frameView()->scrollX(); + scrolledY += toRenderView(this)->frameView()->scrollY(); + } + + FloatingObject* o; + DeprecatedPtrListIterator it(*m_floatingObjects); + for (it.toLast(); (o = it.current()); --it) { + if (o->m_shouldPaint && !o->m_renderer->hasSelfPaintingLayer()) { + int xoffset = scrolledX + o->m_left + o->m_renderer->marginLeft() - o->m_renderer->x(); + int yoffset = scrolledY + o->m_top + o->m_renderer->marginTop() - o->m_renderer->y(); + if (o->m_renderer->hitTest(request, result, IntPoint(_x, _y), xoffset, yoffset)) { + updateHitTestResult(result, IntPoint(_x - xoffset, _y - yoffset)); + return true; + } + } + } + } + } + + // Now hit test our background + if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) { + IntRect boundsRect(tx, ty, width(), height()); + if (visibleToHitTesting() && boundsRect.intersects(result.rectFromPoint(_x, _y))) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); + if (!result.addNodeToRectBasedTestResult(node(), _x, _y, boundsRect)) + return true; + } + } + + return false; +} + +bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) +{ + // We need to do multiple passes, breaking up our hit testing into strips. + Vector* colRects = columnRects(); + int colCount = colRects->size(); + if (!colCount) + return false; + int left = borderLeft() + paddingLeft(); + int currYOffset = 0; + int i; + for (i = 0; i < colCount; i++) + currYOffset -= colRects->at(i).height(); + for (i = colCount - 1; i >= 0; i--) { + IntRect colRect = colRects->at(i); + int currXOffset = colRect.x() - left; + currYOffset += colRect.height(); + colRect.move(tx, ty); + + if (colRect.intersects(result.rectFromPoint(x, y))) { + // The point is inside this column. + // Adjust tx and ty to change where we hit test. + + int finalX = tx + currXOffset; + int finalY = ty + currYOffset; + if (result.isRectBasedTest() && !colRect.contains(result.rectFromPoint(x, y))) + hitTestContents(request, result, x, y, finalX, finalY, hitTestAction); + else + return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction); + } + } + + return false; +} + +bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) +{ + if (childrenInline() && !isTable()) { + // We have to hit-test our line boxes. + if (m_lineBoxes.hitTest(this, request, result, x, y, tx, ty, hitTestAction)) + return true; + } else { + // Hit test our children. + HitTestAction childHitTest = hitTestAction; + if (hitTestAction == HitTestChildBlockBackgrounds) + childHitTest = HitTestChildBlockBackground; + for (RenderBox* child = lastChildBox(); child; child = child->previousSiblingBox()) { + if (!child->hasSelfPaintingLayer() && !child->isFloating() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) + return true; + } + } + + return false; +} + +Position RenderBlock::positionForBox(InlineBox *box, bool start) const +{ + if (!box) + return Position(); + + if (!box->renderer()->node()) + return Position(node(), start ? caretMinOffset() : caretMaxOffset()); + + if (!box->isInlineTextBox()) + return Position(box->renderer()->node(), start ? box->renderer()->caretMinOffset() : box->renderer()->caretMaxOffset()); + + InlineTextBox *textBox = static_cast(box); + return Position(box->renderer()->node(), start ? textBox->start() : textBox->start() + textBox->len()); +} + +Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const +{ + if (!renderer) + return Position(node(), 0); + + Node* n = renderer->node() ? renderer->node() : node(); + if (!n) + return Position(); + + ASSERT(renderer == n->renderer()); + + int offset = start ? renderer->caretMinOffset() : renderer->caretMaxOffset(); + + // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now. + ASSERT(!n->isCharacterDataNode() || renderer->isText()); + + return Position(n, offset); +} + +// FIXME: This function should go on RenderObject as an instance method. Then +// all cases in which positionForPoint recurs could call this instead to +// prevent crossing editable boundaries. This would require many tests. +static VisiblePosition positionForPointRespectingEditingBoundaries(RenderBox* parent, RenderBox* child, const IntPoint& pointInParentCoordinates) +{ + IntPoint pointInChildCoordinates(pointInParentCoordinates - child->location()); + + // If this is an anonymous renderer, we just recur normally + Node* childNode = child->node(); + if (!childNode) + return child->positionForPoint(pointInChildCoordinates); + + // Otherwise, first make sure that the editability of the parent and child agree. + // If they don't agree, then we return a visible position just before or after the child + RenderObject* ancestor = parent; + while (ancestor && !ancestor->node()) + ancestor = ancestor->parent(); + + // If we can't find an ancestor to check editability on, or editability is unchanged, we recur like normal + if (!ancestor || ancestor->node()->isContentEditable() == childNode->isContentEditable()) + return child->positionForPoint(pointInChildCoordinates); + + // Otherwise return before or after the child, depending on if the click was left or right of the child + int childMidX = child->width() / 2; + if (pointInChildCoordinates.x() < childMidX) + return ancestor->createVisiblePosition(childNode->nodeIndex(), DOWNSTREAM); + return ancestor->createVisiblePosition(childNode->nodeIndex() + 1, UPSTREAM); +} + +VisiblePosition RenderBlock::positionForPointWithInlineChildren(const IntPoint& pointInContents) +{ + ASSERT(childrenInline()); + + if (!firstRootBox()) + return createVisiblePosition(0, DOWNSTREAM); + + // look for the closest line box in the root box which is at the passed-in y coordinate + InlineBox* closestBox = 0; + RootInlineBox* firstRootBoxWithChildren = 0; + RootInlineBox* lastRootBoxWithChildren = 0; + for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) { + if (!root->firstLeafChild()) + continue; + if (!firstRootBoxWithChildren) + firstRootBoxWithChildren = root; + lastRootBoxWithChildren = root; + + // set the bottom based on whether there is a next root box + // FIXME: This will consider nextRootBox even if it has no children, and maybe it shouldn't. + int bottom; + if (root->nextRootBox()) { + // FIXME: We would prefer to make the break point halfway between the bottom + // of the previous root box and the top of the next root box. + bottom = root->nextRootBox()->lineTop(); + } else + bottom = root->lineBottom() + verticalLineClickFudgeFactor; + + // check if this root line box is located at this y coordinate + if (pointInContents.y() < bottom) { + closestBox = root->closestLeafChildForXPos(pointInContents.x()); + if (closestBox) + break; + } + } + + bool moveCaretToBoundary = document()->frame()->editor()->behavior().shouldMoveCaretToHorizontalBoundaryWhenPastTopOrBottom(); + + if (!moveCaretToBoundary && !closestBox && lastRootBoxWithChildren) { + // y coordinate is below last root line box, pretend we hit it + closestBox = lastRootBoxWithChildren->closestLeafChildForXPos(pointInContents.x()); + } + + if (closestBox) { + if (moveCaretToBoundary && pointInContents.y() < firstRootBoxWithChildren->lineTop() - verticalLineClickFudgeFactor) { + // y coordinate is above first root line box, so return the start of the first + return VisiblePosition(positionForBox(firstRootBoxWithChildren->firstLeafChild(), true), DOWNSTREAM); + } + + // pass the box a y position that is inside it + return closestBox->renderer()->positionForPoint(IntPoint(pointInContents.x(), closestBox->m_y)); + } + + if (lastRootBoxWithChildren) { + // We hit this case for Mac behavior when the Y coordinate is below the last box. + ASSERT(moveCaretToBoundary); + return VisiblePosition(positionForBox(lastRootBoxWithChildren->lastLeafChild(), false), DOWNSTREAM); + } + + // Can't reach this. We have a root line box, but it has no kids. + // FIXME: This should ASSERT_NOT_REACHED(), but clicking on placeholder text + // seems to hit this code path. + return createVisiblePosition(0, DOWNSTREAM); +} + +static inline bool isChildHitTestCandidate(RenderBox* box) +{ + return box->height() && box->style()->visibility() == VISIBLE && !box->isFloatingOrPositioned(); +} + +VisiblePosition RenderBlock::positionForPoint(const IntPoint& point) +{ + if (isTable()) + return RenderBox::positionForPoint(point); + + if (isReplaced()) { + if (point.y() < 0 || (point.y() < height() && point.x() < 0)) + return createVisiblePosition(caretMinOffset(), DOWNSTREAM); + if (point.y() >= height() || (point.y() >= 0 && point.x() >= width())) + return createVisiblePosition(caretMaxOffset(), DOWNSTREAM); + } + + int contentsX = point.x(); + int contentsY = point.y(); + offsetForContents(contentsX, contentsY); + IntPoint pointInContents(contentsX, contentsY); + + if (childrenInline()) + return positionForPointWithInlineChildren(pointInContents); + + if (lastChildBox() && contentsY > lastChildBox()->y()) { + for (RenderBox* childBox = lastChildBox(); childBox; childBox = childBox->previousSiblingBox()) { + if (isChildHitTestCandidate(childBox)) + return positionForPointRespectingEditingBoundaries(this, childBox, pointInContents); + } + } else { + for (RenderBox* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) { + // We hit child if our click is above the bottom of its padding box (like IE6/7 and FF3). + if (isChildHitTestCandidate(childBox) && contentsY < childBox->frameRect().bottom()) + return positionForPointRespectingEditingBoundaries(this, childBox, pointInContents); + } + } + + // We only get here if there are no hit test candidate children below the click. + return RenderBox::positionForPoint(point); +} + +void RenderBlock::offsetForContents(int& tx, int& ty) const +{ + IntPoint contentsPoint(tx, ty); + + if (hasOverflowClip()) + contentsPoint += layer()->scrolledContentOffset(); + + if (hasColumns()) + adjustPointToColumnContents(contentsPoint); + + tx = contentsPoint.x(); + ty = contentsPoint.y(); +} + +int RenderBlock::availableWidth() const +{ + // If we have multiple columns, then the available width is reduced to our column width. + if (hasColumns()) + return desiredColumnWidth(); + return contentWidth(); +} + +int RenderBlock::columnGap() const +{ + if (style()->hasNormalColumnGap()) + return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. 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