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author | Lars Knoll <lars.knoll@nokia.com> | 2009-03-23 09:34:13 (GMT) |
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committer | Simon Hausmann <simon.hausmann@nokia.com> | 2009-03-23 09:34:13 (GMT) |
commit | 67ad0519fd165acee4a4d2a94fa502e9e4847bd0 (patch) | |
tree | 1dbf50b3dff8d5ca7e9344733968c72704eb15ff /src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp | |
download | Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.zip Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.tar.gz Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.tar.bz2 |
Long live Qt!
Diffstat (limited to 'src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp')
-rw-r--r-- | src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp | 4671 |
1 files changed, 4671 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp b/src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp new file mode 100644 index 0000000..0aa58da --- /dev/null +++ b/src/3rdparty/webkit/WebCore/rendering/RenderBlock.cpp @@ -0,0 +1,4671 @@ +/* + * Copyright (C) 1999 Lars Knoll (knoll@kde.org) + * (C) 1999 Antti Koivisto (koivisto@kde.org) + * (C) 2007 David Smith (catfish.man@gmail.com) + * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#include "config.h" +#include "RenderBlock.h" + +#include "Document.h" +#include "Element.h" +#include "Frame.h" +#include "FrameView.h" +#include "GraphicsContext.h" +#include "HTMLNames.h" +#include "HitTestResult.h" +#include "InlineTextBox.h" +#include "RenderImage.h" +#include "RenderMarquee.h" +#include "RenderReplica.h" +#include "RenderTableCell.h" +#include "RenderTextFragment.h" +#include "RenderTheme.h" +#include "RenderView.h" +#include "SelectionController.h" +#include <wtf/StdLibExtras.h> + +using namespace std; +using namespace WTF; +using namespace Unicode; + +namespace WebCore { + +// Number of pixels to allow as a fudge factor when clicking above or below a line. +// clicking up to verticalLineClickFudgeFactor pixels above a line will correspond to the closest point on the line. +const int verticalLineClickFudgeFactor= 3; + +using namespace HTMLNames; + +struct ColumnInfo { + ColumnInfo() + : m_desiredColumnWidth(0) + , m_desiredColumnCount(1) + { } + int m_desiredColumnWidth; + unsigned m_desiredColumnCount; + Vector<IntRect> m_columnRects; +}; + +typedef WTF::HashMap<const RenderBox*, ColumnInfo*> ColumnInfoMap; +static ColumnInfoMap* gColumnInfoMap = 0; + +typedef WTF::HashMap<const RenderBlock*, HashSet<RenderBox*>*> PercentHeightDescendantsMap; +static PercentHeightDescendantsMap* gPercentHeightDescendantsMap = 0; + +typedef WTF::HashMap<const RenderBox*, HashSet<RenderBlock*>*> PercentHeightContainerMap; +static PercentHeightContainerMap* gPercentHeightContainerMap = 0; + +typedef WTF::HashMap<RenderBlock*, RenderFlowSequencedSet*> ContinuationOutlineTableMap; + +// Our MarginInfo state used when laying out block children. +RenderBlock::MarginInfo::MarginInfo(RenderBlock* block, int top, int bottom) +{ + // Whether or not we can collapse our own margins with our children. We don't do this + // if we had any border/padding (obviously), if we're the root or HTML elements, or if + // we're positioned, floating, a table cell. + m_canCollapseWithChildren = !block->isRenderView() && !block->isRoot() && !block->isPositioned() && + !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable(); + + m_canCollapseTopWithChildren = m_canCollapseWithChildren && (top == 0) && block->style()->marginTopCollapse() != MSEPARATE; + + // If any height other than auto is specified in CSS, then we don't collapse our bottom + // margins with our children's margins. To do otherwise would be to risk odd visual + // effects when the children overflow out of the parent block and yet still collapse + // with it. We also don't collapse if we have any bottom border/padding. + m_canCollapseBottomWithChildren = m_canCollapseWithChildren && (bottom == 0) && + (block->style()->height().isAuto() && block->style()->height().value() == 0) && block->style()->marginBottomCollapse() != MSEPARATE; + + m_quirkContainer = block->isTableCell() || block->isBody() || block->style()->marginTopCollapse() == MDISCARD || + block->style()->marginBottomCollapse() == MDISCARD; + + m_atTopOfBlock = true; + m_atBottomOfBlock = false; + + m_posMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(true) : 0; + m_negMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(false) : 0; + + m_selfCollapsingBlockClearedFloat = false; + + m_topQuirk = m_bottomQuirk = m_determinedTopQuirk = false; +} + +// ------------------------------------------------------------------------------------------------------- + +RenderBlock::RenderBlock(Node* node) + : RenderFlow(node) + , m_floatingObjects(0) + , m_positionedObjects(0) + , m_maxMargin(0) + , m_overflowHeight(0) + , m_overflowWidth(0) + , m_overflowLeft(0) + , m_overflowTop(0) +{ +} + +RenderBlock::~RenderBlock() +{ + delete m_floatingObjects; + delete m_positionedObjects; + delete m_maxMargin; + + if (m_hasColumns) + delete gColumnInfoMap->take(this); + + if (gPercentHeightDescendantsMap) { + if (HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->take(this)) { + HashSet<RenderBox*>::iterator end = descendantSet->end(); + for (HashSet<RenderBox*>::iterator descendant = descendantSet->begin(); descendant != end; ++descendant) { + HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(*descendant); + ASSERT(containerSet); + if (!containerSet) + continue; + ASSERT(containerSet->contains(this)); + containerSet->remove(this); + if (containerSet->isEmpty()) { + gPercentHeightContainerMap->remove(*descendant); + delete containerSet; + } + } + delete descendantSet; + } + } +} + +void RenderBlock::styleWillChange(RenderStyle::Diff diff, const RenderStyle* newStyle) +{ + setReplaced(newStyle->isDisplayReplacedType()); + RenderFlow::styleWillChange(diff, newStyle); +} + +void RenderBlock::styleDidChange(RenderStyle::Diff diff, const RenderStyle* oldStyle) +{ + RenderFlow::styleDidChange(diff, oldStyle); + + // FIXME: We could save this call when the change only affected non-inherited properties + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if (child->isAnonymousBlock()) { + RefPtr<RenderStyle> newStyle = RenderStyle::create(); + newStyle->inheritFrom(style()); + newStyle->setDisplay(BLOCK); + child->setStyle(newStyle.release()); + } + } + + m_lineHeight = -1; + + // Update pseudos for :before and :after now. + if (!isAnonymous() && canHaveChildren()) { + updateBeforeAfterContent(RenderStyle::BEFORE); + updateBeforeAfterContent(RenderStyle::AFTER); + } + updateFirstLetter(); +} + +void RenderBlock::addChildToFlow(RenderObject* newChild, RenderObject* beforeChild) +{ + // Make sure we don't append things after :after-generated content if we have it. + if (!beforeChild && isAfterContent(lastChild())) + beforeChild = lastChild(); + + bool madeBoxesNonInline = false; + + // If the requested beforeChild is not one of our children, then this is because + // there is an anonymous container within this object that contains the beforeChild. + if (beforeChild && beforeChild->parent() != this) { + RenderObject* anonymousChild = beforeChild->parent(); + ASSERT(anonymousChild); + + while (anonymousChild->parent() != this) + anonymousChild = anonymousChild->parent(); + + ASSERT(anonymousChild->isAnonymous()); + + if (anonymousChild->isAnonymousBlock()) { + // Insert the child into the anonymous block box instead of here. + if (newChild->isInline() || beforeChild->parent()->firstChild() != beforeChild) + beforeChild->parent()->addChild(newChild, beforeChild); + else + addChildToFlow(newChild, beforeChild->parent()); + return; + } + + ASSERT(anonymousChild->isTable()); + if (newChild->isTableCol() && newChild->style()->display() == TABLE_COLUMN_GROUP + || newChild->isRenderBlock() && newChild->style()->display() == TABLE_CAPTION + || newChild->isTableSection() + || newChild->isTableRow() + || newChild->isTableCell()) { + // Insert into the anonymous table. + anonymousChild->addChild(newChild, beforeChild); + return; + } + + // Go on to insert before the anonymous table. + beforeChild = anonymousChild; + } + + // A block has to either have all of its children inline, or all of its children as blocks. + // So, if our children are currently inline and a block child has to be inserted, we move all our + // inline children into anonymous block boxes. + if (m_childrenInline && !newChild->isInline() && !newChild->isFloatingOrPositioned()) { + // This is a block with inline content. Wrap the inline content in anonymous blocks. + makeChildrenNonInline(beforeChild); + madeBoxesNonInline = true; + + if (beforeChild && beforeChild->parent() != this) { + beforeChild = beforeChild->parent(); + ASSERT(beforeChild->isAnonymousBlock()); + ASSERT(beforeChild->parent() == this); + } + } else if (!m_childrenInline && (newChild->isFloatingOrPositioned() || newChild->isInline())) { + // If we're inserting an inline child but all of our children are blocks, then we have to make sure + // it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise + // a new one is created and inserted into our list of children in the appropriate position. + RenderObject* afterChild = beforeChild ? beforeChild->previousSibling() : lastChild(); + + if (afterChild && afterChild->isAnonymousBlock()) { + afterChild->addChild(newChild); + return; + } + + if (newChild->isInline()) { + // No suitable existing anonymous box - create a new one. + RenderBlock* newBox = createAnonymousBlock(); + RenderContainer::addChild(newBox, beforeChild); + newBox->addChild(newChild); + return; + } + } + + RenderContainer::addChild(newChild, beforeChild); + // ### care about aligned stuff + + if (madeBoxesNonInline && parent() && isAnonymousBlock()) + parent()->removeLeftoverAnonymousBlock(this); + // this object may be dead here +} + +static void getInlineRun(RenderObject* start, RenderObject* boundary, + RenderObject*& inlineRunStart, + RenderObject*& inlineRunEnd) +{ + // Beginning at |start| we find the largest contiguous run of inlines that + // we can. We denote the run with start and end points, |inlineRunStart| + // and |inlineRunEnd|. Note that these two values may be the same if + // we encounter only one inline. + // + // We skip any non-inlines we encounter as long as we haven't found any + // inlines yet. + // + // |boundary| indicates a non-inclusive boundary point. Regardless of whether |boundary| + // is inline or not, we will not include it in a run with inlines before it. It's as though we encountered + // a non-inline. + + // Start by skipping as many non-inlines as we can. + RenderObject * curr = start; + bool sawInline; + do { + while (curr && !(curr->isInline() || curr->isFloatingOrPositioned())) + curr = curr->nextSibling(); + + inlineRunStart = inlineRunEnd = curr; + + if (!curr) + return; // No more inline children to be found. + + sawInline = curr->isInline(); + + curr = curr->nextSibling(); + while (curr && (curr->isInline() || curr->isFloatingOrPositioned()) && (curr != boundary)) { + inlineRunEnd = curr; + if (curr->isInline()) + sawInline = true; + curr = curr->nextSibling(); + } + } while (!sawInline); +} + +void RenderBlock::deleteLineBoxTree() +{ + InlineFlowBox* line = m_firstLineBox; + InlineFlowBox* nextLine; + while (line) { + nextLine = line->nextFlowBox(); + line->deleteLine(renderArena()); + line = nextLine; + } + m_firstLineBox = m_lastLineBox = 0; +} + +void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint) +{ + // makeChildrenNonInline takes a block whose children are *all* inline and it + // makes sure that inline children are coalesced under anonymous + // blocks. If |insertionPoint| is defined, then it represents the insertion point for + // the new block child that is causing us to have to wrap all the inlines. This + // means that we cannot coalesce inlines before |insertionPoint| with inlines following + // |insertionPoint|, because the new child is going to be inserted in between the inlines, + // splitting them. + ASSERT(isInlineBlockOrInlineTable() || !isInline()); + ASSERT(!insertionPoint || insertionPoint->parent() == this); + + m_childrenInline = false; + + RenderObject *child = firstChild(); + if (!child) + return; + + deleteLineBoxTree(); + + while (child) { + RenderObject *inlineRunStart, *inlineRunEnd; + getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd); + + if (!inlineRunStart) + break; + + child = inlineRunEnd->nextSibling(); + + RenderBlock* box = createAnonymousBlock(); + insertChildNode(box, inlineRunStart); + RenderObject* o = inlineRunStart; + while(o != inlineRunEnd) + { + RenderObject* no = o; + o = no->nextSibling(); + box->moveChildNode(no); + } + box->moveChildNode(inlineRunEnd); + } + +#ifndef NDEBUG + for (RenderObject *c = firstChild(); c; c = c->nextSibling()) + ASSERT(!c->isInline()); +#endif + + repaint(); +} + +void RenderBlock::removeChild(RenderObject *oldChild) +{ + // If this child is a block, and if our previous and next siblings are + // both anonymous blocks with inline content, then we can go ahead and + // fold the inline content back together. + RenderObject* prev = oldChild->previousSibling(); + RenderObject* next = oldChild->nextSibling(); + bool canDeleteAnonymousBlocks = !documentBeingDestroyed() && !isInline() && !oldChild->isInline() && + !oldChild->continuation() && + (!prev || (prev->isAnonymousBlock() && prev->childrenInline())) && + (!next || (next->isAnonymousBlock() && next->childrenInline())); + if (canDeleteAnonymousBlocks && prev && next) { + // Take all the children out of the |next| block and put them in + // the |prev| block. + prev->setNeedsLayoutAndPrefWidthsRecalc(); + RenderObject* o = next->firstChild(); + while (o) { + RenderObject* no = o; + o = no->nextSibling(); + prev->moveChildNode(no); + } + + RenderBlock* nextBlock = static_cast<RenderBlock*>(next); + nextBlock->deleteLineBoxTree(); + + // Nuke the now-empty block. + next->destroy(); + } + + RenderFlow::removeChild(oldChild); + + RenderObject* child = prev ? prev : next; + if (canDeleteAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && !isFlexibleBox()) { + // The removal has knocked us down to containing only a single anonymous + // box. We can go ahead and pull the content right back up into our + // box. + setNeedsLayoutAndPrefWidthsRecalc(); + RenderBlock* anonBlock = static_cast<RenderBlock*>(removeChildNode(child, false)); + m_childrenInline = true; + RenderObject* o = anonBlock->firstChild(); + while (o) { + RenderObject* no = o; + o = no->nextSibling(); + moveChildNode(no); + } + + // Delete the now-empty block's lines and nuke it. + anonBlock->deleteLineBoxTree(); + anonBlock->destroy(); + } +} + +int RenderBlock::overflowHeight(bool includeInterior) const +{ + if (!includeInterior && hasOverflowClip()) { + int shadowHeight = 0; + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) + shadowHeight = max(boxShadow->y + boxShadow->blur, shadowHeight); + int height = m_height + shadowHeight; + if (hasReflection()) + height = max(height, reflectionBox().bottom()); + return height; + } + return m_overflowHeight; +} + +int RenderBlock::overflowWidth(bool includeInterior) const +{ + if (!includeInterior && hasOverflowClip()) { + int shadowWidth = 0; + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) + shadowWidth = max(boxShadow->x + boxShadow->blur, shadowWidth); + int width = m_width + shadowWidth; + if (hasReflection()) + width = max(width, reflectionBox().right()); + return width; + } + return m_overflowWidth; +} + +int RenderBlock::overflowLeft(bool includeInterior) const +{ + if (!includeInterior && hasOverflowClip()) { + int shadowLeft = 0; + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) + shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft); + int left = shadowLeft; + if (hasReflection()) + left = min(left, reflectionBox().x()); + return left; + } + return m_overflowLeft; +} + +int RenderBlock::overflowTop(bool includeInterior) const +{ + if (!includeInterior && hasOverflowClip()) { + int shadowTop = 0; + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) + shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop); + int top = shadowTop; + if (hasReflection()) + top = min(top, reflectionBox().y()); + return top; + } + return m_overflowTop; +} + +IntRect RenderBlock::overflowRect(bool includeInterior) const +{ + if (!includeInterior && hasOverflowClip()) { + IntRect box = borderBox(); + int shadowLeft = 0; + int shadowRight = 0; + int shadowTop = 0; + int shadowBottom = 0; + + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) { + shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft); + shadowRight = max(boxShadow->x + boxShadow->blur, shadowRight); + shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop); + shadowBottom = max(boxShadow->y + boxShadow->blur, shadowBottom); + } + + box.move(shadowLeft, shadowTop); + box.setWidth(box.width() - shadowLeft + shadowRight); + box.setHeight(box.height() - shadowTop + shadowBottom); + + if (hasReflection()) { + IntRect reflection(reflectionBox()); + int reflectTop = min(box.y(), reflection.y()); + int reflectBottom = max(box.bottom(), reflection.bottom()); + box.setHeight(reflectBottom - reflectTop); + box.setY(reflectTop); + + int reflectLeft = min(box.x(), reflection.x()); + int reflectRight = max(box.right(), reflection.right()); + box.setWidth(reflectRight - reflectLeft); + box.setX(reflectLeft); + } + return box; + } + + if (!includeInterior && hasOverflowClip()) + return borderBox(); + int l = overflowLeft(includeInterior); + int t = min(overflowTop(includeInterior), -borderTopExtra()); + return IntRect(l, t, overflowWidth(includeInterior) - l, max(overflowHeight(includeInterior), height() + borderBottomExtra()) - t); +} + +bool RenderBlock::isSelfCollapsingBlock() const +{ + // We are not self-collapsing if we + // (a) have a non-zero height according to layout (an optimization to avoid wasting time) + // (b) are a table, + // (c) have border/padding, + // (d) have a min-height + // (e) have specified that one of our margins can't collapse using a CSS extension + if (m_height > 0 || + isTable() || (borderBottom() + paddingBottom() + borderTop() + paddingTop()) != 0 || + style()->minHeight().isPositive() || + style()->marginTopCollapse() == MSEPARATE || style()->marginBottomCollapse() == MSEPARATE) + return false; + + bool hasAutoHeight = style()->height().isAuto(); + if (style()->height().isPercent() && !style()->htmlHacks()) { + hasAutoHeight = true; + for (RenderBlock* cb = containingBlock(); !cb->isRenderView(); cb = cb->containingBlock()) { + if (cb->style()->height().isFixed() || cb->isTableCell()) + hasAutoHeight = false; + } + } + + // If the height is 0 or auto, then whether or not we are a self-collapsing block depends + // on whether we have content that is all self-collapsing or not. + if (hasAutoHeight || ((style()->height().isFixed() || style()->height().isPercent()) && style()->height().isZero())) { + // If the block has inline children, see if we generated any line boxes. If we have any + // line boxes, then we can't be self-collapsing, since we have content. + if (childrenInline()) + return !firstLineBox(); + + // Whether or not we collapse is dependent on whether all our normal flow children + // are also self-collapsing. + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if (child->isFloatingOrPositioned()) + continue; + if (!child->isSelfCollapsingBlock()) + return false; + } + return true; + } + return false; +} + +void RenderBlock::layout() +{ + // Update our first letter info now. + updateFirstLetter(); + + // Table cells call layoutBlock directly, so don't add any logic here. Put code into + // layoutBlock(). + layoutBlock(false); + + // It's safe to check for control clip here, since controls can never be table cells. + if (hasControlClip()) { + // Because of the lightweight clip, there can never be any overflow from children. + m_overflowWidth = m_width; + m_overflowHeight = m_height; + m_overflowLeft = 0; + m_overflowTop = 0; + } +} + +void RenderBlock::layoutBlock(bool relayoutChildren) +{ + ASSERT(needsLayout()); + + if (isInline() && !isInlineBlockOrInlineTable()) // Inline <form>s inside various table elements can + return; // cause us to come in here. Just bail. + + if (!relayoutChildren && layoutOnlyPositionedObjects()) + return; + + IntRect oldBounds; + IntRect oldOutlineBox; + bool checkForRepaint = m_everHadLayout && checkForRepaintDuringLayout(); + if (checkForRepaint) { + oldBounds = absoluteClippedOverflowRect(); + oldOutlineBox = absoluteOutlineBounds(); + } + + LayoutStateMaintainer statePusher(view(), this, IntSize(xPos(), yPos()), !m_hasColumns && !hasReflection()); + + int oldWidth = m_width; + int oldColumnWidth = desiredColumnWidth(); + + calcWidth(); + calcColumnWidth(); + + m_overflowWidth = m_width; + m_overflowLeft = 0; + + if (oldWidth != m_width || oldColumnWidth != desiredColumnWidth()) + relayoutChildren = true; + + clearFloats(); + + int previousHeight = m_height; + m_height = 0; + m_overflowHeight = 0; + + // We use four values, maxTopPos, maxPosNeg, maxBottomPos, and maxBottomNeg, to track + // our current maximal positive and negative margins. These values are used when we + // are collapsed with adjacent blocks, so for example, if you have block A and B + // collapsing together, then you'd take the maximal positive margin from both A and B + // and subtract it from the maximal negative margin from both A and B to get the + // true collapsed margin. This algorithm is recursive, so when we finish layout() + // our block knows its current maximal positive/negative values. + // + // Start out by setting our margin values to our current margins. Table cells have + // no margins, so we don't fill in the values for table cells. + bool isCell = isTableCell(); + if (!isCell) { + initMaxMarginValues(); + + m_topMarginQuirk = style()->marginTop().quirk(); + m_bottomMarginQuirk = style()->marginBottom().quirk(); + + Node* node = element(); + if (node && node->hasTagName(formTag) && static_cast<HTMLFormElement*>(node)->isMalformed()) { + // See if this form is malformed (i.e., unclosed). If so, don't give the form + // a bottom margin. + setMaxBottomMargins(0, 0); + } + } + + // For overflow:scroll blocks, ensure we have both scrollbars in place always. + if (scrollsOverflow()) { + if (style()->overflowX() == OSCROLL) + m_layer->setHasHorizontalScrollbar(true); + if (style()->overflowY() == OSCROLL) + m_layer->setHasVerticalScrollbar(true); + } + + int repaintTop = 0; + int repaintBottom = 0; + int maxFloatBottom = 0; + if (childrenInline()) + layoutInlineChildren(relayoutChildren, repaintTop, repaintBottom); + else + layoutBlockChildren(relayoutChildren, maxFloatBottom); + + // Expand our intrinsic height to encompass floats. + int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight(); + if (floatBottom() > (m_height - toAdd) && (isInlineBlockOrInlineTable() || isFloatingOrPositioned() || hasOverflowClip() || + (parent() && parent()->isFlexibleBox() || m_hasColumns))) + m_height = floatBottom() + toAdd; + + // Now lay out our columns within this intrinsic height, since they can slightly affect the intrinsic height as + // we adjust for clean column breaks. + int singleColumnBottom = layoutColumns(); + + // Calculate our new height. + int oldHeight = m_height; + calcHeight(); + if (oldHeight != m_height) { + if (oldHeight > m_height && maxFloatBottom > m_height && !childrenInline()) { + // One of our children's floats may have become an overhanging float for us. We need to look for it. + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if (child->isBlockFlow() && !child->isFloatingOrPositioned()) { + RenderBlock* block = static_cast<RenderBlock*>(child); + if (block->floatBottom() + block->yPos() > m_height) + addOverhangingFloats(block, -block->xPos(), -block->yPos(), false); + } + } + } + // We have to rebalance columns to the new height. + layoutColumns(singleColumnBottom); + + // If the block got expanded in size, then increase our overflowheight to match. + if (m_overflowHeight > m_height) + m_overflowHeight -= toAdd; + if (m_overflowHeight < m_height) + m_overflowHeight = m_height; + } + if (previousHeight != m_height) + relayoutChildren = true; + + // Some classes of objects (floats and fieldsets with no specified heights and table cells) expand to encompass + // overhanging floats. + if (hasOverhangingFloats() && expandsToEncloseOverhangingFloats()) { + m_height = floatBottom(); + m_height += borderBottom() + paddingBottom(); + } + + if ((isCell || isInline() || isFloatingOrPositioned() || isRoot()) && !hasOverflowClip() && !hasControlClip()) + addVisualOverflow(floatRect()); + + layoutPositionedObjects(relayoutChildren || isRoot()); + + positionListMarker(); + + // Always ensure our overflow width/height are at least as large as our width/height. + m_overflowWidth = max(m_overflowWidth, m_width); + m_overflowHeight = max(m_overflowHeight, m_height); + + if (!hasOverflowClip()) { + for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) { + m_overflowLeft = min(m_overflowLeft, boxShadow->x - boxShadow->blur); + m_overflowWidth = max(m_overflowWidth, m_width + boxShadow->x + boxShadow->blur); + m_overflowTop = min(m_overflowTop, boxShadow->y - boxShadow->blur); + m_overflowHeight = max(m_overflowHeight, m_height + boxShadow->y + boxShadow->blur); + } + + if (hasReflection()) { + m_overflowTop = min(m_overflowTop, reflectionBox().y()); + m_overflowHeight = max(m_overflowHeight, reflectionBox().bottom()); + } + } + + statePusher.pop(); + + // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if + // we overflow or not. + if (hasOverflowClip()) + m_layer->updateScrollInfoAfterLayout(); + + // Repaint with our new bounds if they are different from our old bounds. + bool didFullRepaint = false; + if (checkForRepaint) + didFullRepaint = repaintAfterLayoutIfNeeded(oldBounds, oldOutlineBox); + if (!didFullRepaint && repaintTop != repaintBottom && (style()->visibility() == VISIBLE || enclosingLayer()->hasVisibleContent())) { + IntRect repaintRect(m_overflowLeft, repaintTop, m_overflowWidth - m_overflowLeft, repaintBottom - repaintTop); + + // FIXME: Deal with multiple column repainting. We have to split the repaint + // rect up into multiple rects if it spans columns. + + repaintRect.inflate(maximalOutlineSize(PaintPhaseOutline)); + + if (hasOverflowClip()) { + // Adjust repaint rect for scroll offset + int x = repaintRect.x(); + int y = repaintRect.y(); + layer()->subtractScrolledContentOffset(x, y); + repaintRect.setX(x); + repaintRect.setY(y); + + // Don't allow this rect to spill out of our overflow box. + repaintRect.intersect(IntRect(0, 0, m_width, m_height)); + } + + // Make sure the rect is still non-empty after intersecting for overflow above + if (!repaintRect.isEmpty()) { + repaintRectangle(repaintRect); // We need to do a partial repaint of our content. + if (hasReflection()) + layer()->reflection()->repaintRectangle(repaintRect); + } + } + setNeedsLayout(false); +} + +void RenderBlock::adjustPositionedBlock(RenderObject* child, const MarginInfo& marginInfo) +{ + if (child->hasStaticX()) { + if (style()->direction() == LTR) + child->setStaticX(borderLeft() + paddingLeft()); + else + child->setStaticX(borderRight() + paddingRight()); + } + + if (child->hasStaticY()) { + int y = m_height; + if (!marginInfo.canCollapseWithTop()) { + child->calcVerticalMargins(); + int marginTop = child->marginTop(); + int collapsedTopPos = marginInfo.posMargin(); + int collapsedTopNeg = marginInfo.negMargin(); + if (marginTop > 0) { + if (marginTop > collapsedTopPos) + collapsedTopPos = marginTop; + } else { + if (-marginTop > collapsedTopNeg) + collapsedTopNeg = -marginTop; + } + y += (collapsedTopPos - collapsedTopNeg) - marginTop; + } + child->setStaticY(y); + } +} + +void RenderBlock::adjustFloatingBlock(const MarginInfo& marginInfo) +{ + // The float should be positioned taking into account the bottom margin + // of the previous flow. We add that margin into the height, get the + // float positioned properly, and then subtract the margin out of the + // height again. In the case of self-collapsing blocks, we always just + // use the top margins, since the self-collapsing block collapsed its + // own bottom margin into its top margin. + // + // Note also that the previous flow may collapse its margin into the top of + // our block. If this is the case, then we do not add the margin in to our + // height when computing the position of the float. This condition can be tested + // for by simply calling canCollapseWithTop. See + // http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for + // an example of this scenario. + int marginOffset = marginInfo.canCollapseWithTop() ? 0 : marginInfo.margin(); + m_height += marginOffset; + positionNewFloats(); + m_height -= marginOffset; +} + +RenderObject* RenderBlock::handleSpecialChild(RenderObject* child, const MarginInfo& marginInfo, CompactInfo& compactInfo, bool& handled) +{ + // Handle positioned children first. + RenderObject* next = handlePositionedChild(child, marginInfo, handled); + if (handled) return next; + + // Handle floating children next. + next = handleFloatingChild(child, marginInfo, handled); + if (handled) return next; + + // See if we have a compact element. If we do, then try to tuck the compact element into the margin space of the next block. + next = handleCompactChild(child, compactInfo, handled); + if (handled) return next; + + // Finally, see if we have a run-in element. + return handleRunInChild(child, handled); +} + + +RenderObject* RenderBlock::handlePositionedChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled) +{ + if (child->isPositioned()) { + handled = true; + child->containingBlock()->insertPositionedObject(child); + adjustPositionedBlock(child, marginInfo); + return child->nextSibling(); + } + + return 0; +} + +RenderObject* RenderBlock::handleFloatingChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled) +{ + if (child->isFloating()) { + handled = true; + insertFloatingObject(child); + adjustFloatingBlock(marginInfo); + return child->nextSibling(); + } + + return 0; +} + +RenderObject* RenderBlock::handleCompactChild(RenderObject* child, CompactInfo& compactInfo, bool& handled) +{ + // FIXME: We only deal with one compact at a time. It is unclear what should be + // done if multiple contiguous compacts are encountered. For now we assume that + // compact A followed by another compact B should simply be treated as block A. + if (child->isCompact() && !compactInfo.compact() && (child->childrenInline() || child->isReplaced())) { + // Get the next non-positioned/non-floating RenderBlock. + RenderObject* next = child->nextSibling(); + RenderObject* curr = next; + while (curr && curr->isFloatingOrPositioned()) + curr = curr->nextSibling(); + if (curr && curr->isRenderBlock() && !curr->isCompact() && !curr->isRunIn()) { + curr->calcWidth(); // So that horizontal margins are correct. + + child->setInline(true); // Need to compute the margins/width for the child as though it is an inline, so that it won't try to puff up the margins to + // fill the containing block width. + child->calcWidth(); + int childMargins = child->marginLeft() + child->marginRight(); + int margin = style()->direction() == LTR ? curr->marginLeft() : curr->marginRight(); + if (margin >= (childMargins + child->maxPrefWidth())) { + // The compact will fit in the margin. + handled = true; + compactInfo.set(child, curr); + child->setPos(0,0); // This position will be updated to reflect the compact's + // desired position and the line box for the compact will + // pick that position up. + + // Remove the child. + RenderObject* next = child->nextSibling(); + removeChildNode(child); + + // Now insert the child under |curr|. + curr->insertChildNode(child, curr->firstChild()); + return next; + } + else + child->setInline(false); // We didn't fit, so we remain a block-level element. + } + } + return 0; +} + +void RenderBlock::insertCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo) +{ + if (compactInfo.matches(child)) { + // We have a compact child to squeeze in. + RenderObject* compactChild = compactInfo.compact(); + int compactXPos = borderLeft() + paddingLeft() + compactChild->marginLeft(); + if (style()->direction() == RTL) { + compactChild->calcWidth(); // have to do this because of the capped maxwidth + compactXPos = width() - borderRight() - paddingRight() - marginRight() - + compactChild->width() - compactChild->marginRight(); + } + compactXPos -= child->xPos(); // Put compactXPos into the child's coordinate space. + compactChild->setPos(compactXPos, compactChild->yPos()); // Set the x position. + compactInfo.clear(); + } +} + +RenderObject* RenderBlock::handleRunInChild(RenderObject* child, bool& handled) +{ + // See if we have a run-in element with inline children. If the + // children aren't inline, then just treat the run-in as a normal + // block. + if (child->isRunIn() && (child->childrenInline() || child->isReplaced())) { + // Get the next non-positioned/non-floating RenderBlock. + RenderObject* curr = child->nextSibling(); + while (curr && curr->isFloatingOrPositioned()) + curr = curr->nextSibling(); + if (curr && (curr->isRenderBlock() && curr->childrenInline() && !curr->isCompact() && !curr->isRunIn())) { + // The block acts like an inline, so just null out its + // position. + handled = true; + child->setInline(true); + child->setPos(0,0); + + // Remove the child. + RenderObject* next = child->nextSibling(); + removeChildNode(child); + + // Now insert the child under |curr|. + curr->insertChildNode(child, curr->firstChild()); + return next; + } + } + return 0; +} + +void RenderBlock::collapseMargins(RenderObject* child, MarginInfo& marginInfo, int yPosEstimate) +{ + // Get our max pos and neg top margins. + int posTop = child->maxTopMargin(true); + int negTop = child->maxTopMargin(false); + + // For self-collapsing blocks, collapse our bottom margins into our + // top to get new posTop and negTop values. + if (child->isSelfCollapsingBlock()) { + posTop = max(posTop, child->maxBottomMargin(true)); + negTop = max(negTop, child->maxBottomMargin(false)); + } + + // See if the top margin is quirky. We only care if this child has + // margins that will collapse with us. + bool topQuirk = child->isTopMarginQuirk() || style()->marginTopCollapse() == MDISCARD; + + if (marginInfo.canCollapseWithTop()) { + // This child is collapsing with the top of the + // block. If it has larger margin values, then we need to update + // our own maximal values. + if (!style()->htmlHacks() || !marginInfo.quirkContainer() || !topQuirk) + setMaxTopMargins(max(posTop, maxTopPosMargin()), max(negTop, maxTopNegMargin())); + + // The minute any of the margins involved isn't a quirk, don't + // collapse it away, even if the margin is smaller (www.webreference.com + // has an example of this, a <dt> with 0.8em author-specified inside + // a <dl> inside a <td>. + if (!marginInfo.determinedTopQuirk() && !topQuirk && (posTop-negTop)) { + m_topMarginQuirk = false; + marginInfo.setDeterminedTopQuirk(true); + } + + if (!marginInfo.determinedTopQuirk() && topQuirk && marginTop() == 0) + // We have no top margin and our top child has a quirky margin. + // We will pick up this quirky margin and pass it through. + // This deals with the <td><div><p> case. + // Don't do this for a block that split two inlines though. You do + // still apply margins in this case. + m_topMarginQuirk = true; + } + + if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop)) + marginInfo.setTopQuirk(topQuirk); + + int ypos = m_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 = m_height + collapsedTopPos - collapsedTopNeg; + } + else { + if (child->style()->marginTopCollapse() == MSEPARATE) { + m_height += marginInfo.margin() + child->marginTop(); + ypos = m_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. + m_height += max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop); + ypos = m_height; + } + + marginInfo.setPosMargin(child->maxBottomMargin(true)); + marginInfo.setNegMargin(child->maxBottomMargin(false)); + + if (marginInfo.margin()) + marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD); + + marginInfo.setSelfCollapsingBlockClearedFloat(false); + } + + view()->addLayoutDelta(IntSize(0, yPosEstimate - ypos)); + child->setPos(child->xPos(), ypos); + if (ypos != 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->containsFloats()) + child->markAllDescendantsWithFloatsForLayout(); + + // Our guess was wrong. Make the child lay itself out again. + child->layoutIfNeeded(); + } +} + +void RenderBlock::clearFloatsIfNeeded(RenderObject* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin) +{ + int heightIncrease = getClearDelta(child); + if (!heightIncrease) + return; + + // The child needs to be lowered. Move the child so that it just clears the float. + view()->addLayoutDelta(IntSize(0, -heightIncrease)); + child->setPos(child->xPos(), child->yPos() + heightIncrease); + + 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. + 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. + m_height = child->yPos() - max(0, marginInfo.margin()); + + // Set a flag that we cleared a float so that we know both to increase the height of the block + // to compensate for the clear and to avoid collapsing our margins with the parent block's + // bottom margin. + marginInfo.setSelfCollapsingBlockClearedFloat(true); + } else + // Increase our height by the amount we had to clear. + m_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); + } + + // If our value of clear caused us to be repositioned vertically to be + // underneath a float, we might have to do another layout to take into account + // the extra space we now have available. + 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->containsFloats()) + child->markAllDescendantsWithFloatsForLayout(); + child->layoutIfNeeded(); +} + +int RenderBlock::estimateVerticalPosition(RenderObject* 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 = m_height; + if (!marginInfo.canCollapseWithTop()) { + int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop(); + yPosEstimate += max(marginInfo.margin(), childMarginTop); + } + return yPosEstimate; +} + +void RenderBlock::determineHorizontalPosition(RenderObject* child) +{ + if (style()->direction() == LTR) { + int xPos = borderLeft() + paddingLeft(); + + // 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(m_height); + 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. + static_cast<RenderBox*>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos())); + chPos = leftOff + child->marginLeft(); + } + } + view()->addLayoutDelta(IntSize(child->xPos() - chPos, 0)); + child->setPos(chPos, child->yPos()); + } else { + int xPos = m_width - borderRight() - paddingRight() - verticalScrollbarWidth(); + int chPos = xPos - (child->width() + child->marginRight()); + if (child->avoidsFloats()) { + int rightOff = rightOffset(m_height); + 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. + static_cast<RenderBox*>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos())); + chPos = rightOff - child->marginRight() - child->width(); + } + } + view()->addLayoutDelta(IntSize(child->xPos() - chPos, 0)); + child->setPos(chPos, child->yPos()); + } +} + +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()) + m_bottomMarginQuirk = 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 <td><div><p> case. + m_bottomMarginQuirk = true; + } +} + +void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo) +{ + // If our last flow was a self-collapsing block that cleared a float, then we don't + // collapse it with the bottom of the block. + if (!marginInfo.selfCollapsingBlockClearedFloat()) + marginInfo.setAtBottomOfBlock(true); + else { + // We have to special case the negative margin situation (where the collapsed + // margin of the self-collapsing block is negative), since there's no need + // to make an adjustment in that case. + if (marginInfo.margin() < 0) + marginInfo.clearMargin(); + } + + // 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())) + m_height += marginInfo.margin(); + + // Now add in our bottom border/padding. + m_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. + m_height = max(m_height, top + bottom); + + // Always make sure our overflow height is at least our height. + m_overflowHeight = max(m_height, m_overflowHeight); + + // Update our bottom collapsed margin info. + setCollapsedBottomMargin(marginInfo); +} + +void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom) +{ + if (gPercentHeightDescendantsMap) { + if (HashSet<RenderBox*>* descendants = gPercentHeightDescendantsMap->get(this)) { + HashSet<RenderBox*>::iterator end = descendants->end(); + for (HashSet<RenderBox*>::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(); + + m_height = m_overflowHeight = 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); + CompactInfo compactInfo; + + // 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; + + RenderObject* child = firstChild(); + while (child) { + if (legend == child) { + child = child->nextSibling(); + continue; // Skip the legend, since it has already been positioned up in the fieldset's border. + } + + int oldTopPosMargin = maxTopPosMargin(); + int oldTopNegMargin = maxTopNegMargin(); + + // 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. + bool handled = false; + RenderObject* next = handleSpecialChild(child, marginInfo, compactInfo, handled); + if (handled) { + child = next; + continue; + } + + // 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->xPos(), child->yPos() , child->width(), child->height()); + + // Go ahead and position the child as though it didn't collapse with the top. + view()->addLayoutDelta(IntSize(0, child->yPos() - yPosEstimate)); + child->setPos(child->xPos(), yPosEstimate); + + bool markDescendantsWithFloats = false; + if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && 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 > m_height || fb > yPosEstimate) + markDescendantsWithFloats = true; + } + + if (markDescendantsWithFloats) + child->markAllDescendantsWithFloatsForLayout(); + + if (child->isRenderBlock()) + previousFloatBottom = max(previousFloatBottom, oldRect.y() + static_cast<RenderBlock*>(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. + collapseMargins(child, marginInfo, yPosEstimate); + + // Now check for clear. + clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin); + + // 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. + m_height += child->height(); + if (child->style()->marginBottomCollapse() == MSEPARATE) { + m_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. + maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(static_cast<RenderBlock *>(child), -child->xPos(), -child->yPos(), !childNeededLayout)); + + // Update our overflow in case the child spills out the block. + m_overflowTop = min(m_overflowTop, child->yPos() + child->overflowTop(false)); + m_overflowHeight = max(m_overflowHeight, m_height + child->overflowHeight(false) - child->height()); + m_overflowWidth = max(child->xPos() + child->overflowWidth(false), m_overflowWidth); + m_overflowLeft = min(child->xPos() + child->overflowLeft(false), m_overflowLeft); + + // Insert our compact into the block margin if we have one. + insertCompactIfNeeded(child, compactInfo); + + IntSize childOffset(child->xPos() - oldRect.x(), child->yPos() - 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 = child->nextSibling(); + } + + // 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); +} + +bool RenderBlock::layoutOnlyPositionedObjects() +{ + if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout()) + return false; + + LayoutStateMaintainer statePusher(view(), this, IntSize(xPos(), yPos()), !m_hasColumns); + + if (needsPositionedMovementLayout()) { + tryLayoutDoingPositionedMovementOnly(); + if (needsLayout()) + return false; + } + + // All we have to is lay out our positioned objects. + layoutPositionedObjects(false); + + statePusher.pop(); + + if (hasOverflowClip()) + m_layer->updateScrollInfoAfterLayout(); + + setNeedsLayout(false); + return true; +} + +void RenderBlock::layoutPositionedObjects(bool relayoutChildren) +{ + if (m_positionedObjects) { + RenderObject* 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->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) { + RenderObject* 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<FloatingObject> 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 > m_height && (paintAllDescendants && r->m_renderer->isDescendantOf(this) || r->m_shouldPaint) && !r->m_renderer->hasLayer()) { + r->m_renderer->repaint(); + r->m_renderer->repaintOverhangingFloats(); + } + } + view()->enableLayoutState(); + } +} + +void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty) +{ + tx += m_x; + ty += m_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 (!isInlineFlow() && !isRoot()) { + IntRect overflowBox = overflowRect(false); + overflowBox.inflate(maximalOutlineSize(paintInfo.phase)); + overflowBox.move(tx, ty); + if (!overflowBox.intersects(paintInfo.rect)) + return; + } + + bool useControlClip = phase != PaintPhaseBlockBackground && phase != PaintPhaseSelfOutline && phase != PaintPhaseMask && hasControlClip(); + + // Push a clip. + if (useControlClip) { + if (phase == PaintPhaseOutline) + paintInfo.phase = PaintPhaseChildOutlines; + else if (phase == PaintPhaseChildBlockBackground) { + paintInfo.phase = PaintPhaseBlockBackground; + paintObject(paintInfo, tx, ty); + paintInfo.phase = PaintPhaseChildBlockBackgrounds; + } + IntRect clipRect(controlClipRect(tx, ty)); + if (clipRect.isEmpty()) + return; + paintInfo.context->save(); + paintInfo.context->clip(clipRect); + } + + paintObject(paintInfo, tx, ty); + + // Pop the clip. + if (useControlClip) { + paintInfo.context->restore(); + if (phase == PaintPhaseOutline) { + paintInfo.phase = PaintPhaseSelfOutline; + paintObject(paintInfo, tx, ty); + paintInfo.phase = phase; + } else if (phase == PaintPhaseChildBlockBackground) + paintInfo.phase = phase; + } +} + +void RenderBlock::paintColumns(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 currXOffset = 0; + int currYOffset = 0; + int ruleAdd = borderLeft() + paddingLeft(); + int ruleX = 0; + int colGap = columnGap(); + const Color& ruleColor = style()->columnRuleColor(); + bool ruleTransparent = style()->columnRuleIsTransparent(); + EBorderStyle ruleStyle = style()->columnRuleStyle(); + int ruleWidth = style()->columnRuleWidth(); + bool renderRule = !paintingFloats && ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap; + Vector<IntRect>* colRects = columnRects(); + unsigned colCount = colRects->size(); + 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); + context->save(); + + // Each strip pushes a clip, since column boxes are specified as being + // like overflow:hidden. + context->clip(colRect); + + // Adjust tx and ty to change where we paint. + PaintInfo info(paintInfo); + info.rect.intersect(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); + + // 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); + } + + currYOffset -= colRect.height(); + + context->restore(); + + // Now paint the column rule. + if (renderRule && paintInfo.phase == PaintPhaseForeground && i < colCount - 1) { + int ruleStart = ruleX - ruleWidth / 2 + ruleAdd; + int ruleEnd = ruleStart + ruleWidth; + drawBorder(paintInfo.context, tx + ruleStart, ty + borderTop() + paddingTop(), tx + ruleEnd, ty + borderTop() + paddingTop() + contentHeight(), + style()->direction() == LTR ? BSLeft : BSRight, ruleColor, style()->color(), ruleStyle, 0, 0); + } + + ruleX = currXOffset; + } +} + +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()) + paintLines(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.paintingRoot = paintingRootForChildren(paintInfo); + bool isPrinting = document()->printing(); + + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + // Check for page-break-before: always, and if it's set, break and bail. + if (isPrinting && !childrenInline() && child->style()->pageBreakBefore() == PBALWAYS && + inRootBlockContext() && (ty + child->yPos()) > paintInfo.rect.y() && + (ty + child->yPos()) < paintInfo.rect.bottom()) { + view()->setBestTruncatedAt(ty + child->yPos(), this, true); + return; + } + + if (!child->hasLayer() && !child->isFloating()) + child->paint(info, tx, ty); + + // Check for page-break-after: always, and if it's set, break and bail. + if (isPrinting && !childrenInline() && child->style()->pageBreakAfter() == PBALWAYS && + inRootBlockContext() && (ty + child->yPos() + child->height()) > paintInfo.rect.y() && + (ty + child->yPos() + child->height()) < paintInfo.rect.bottom()) { + view()->setBestTruncatedAt(ty + child->yPos() + child->height() + max(0, child->collapsedMarginBottom()), this, true); + return; + } + } +} + +void RenderBlock::paintCaret(PaintInfo& paintInfo, int tx, int ty, CaretType type) +{ + SelectionController* selection = type == CursorCaret ? document()->frame()->selection() : document()->frame()->dragCaretController(); + + // Ask the SelectionController if the caret should be painted by this block + RenderObject* caretPainter = selection->caretRenderer(); + if (caretPainter == this && selection->isContentEditable()) { + // 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) + document()->frame()->paintCaret(paintInfo.context, tx, ty, paintInfo.rect); + else + document()->frame()->paintDragCaret(paintInfo.context, tx, ty, paintInfo.rect); + } +} + +void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty) +{ + PaintPhase paintPhase = paintInfo.phase; + + // If we're a repositioned run-in or a compact, don't paint background/borders. + bool inlineFlow = isInlineFlow(); + + // 1. paint background, borders etc + if (!inlineFlow && + (paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && + hasBoxDecorations() && style()->visibility() == VISIBLE) { + paintBoxDecorations(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).s + int scrolledX = tx; + int scrolledY = ty; + if (hasOverflowClip()) + m_layer->subtractScrolledContentOffset(scrolledX, scrolledY); + + // 2. paint contents + if (paintPhase != PaintPhaseSelfOutline) { + if (m_hasColumns) + paintColumns(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 (!inlineFlow && !isPrinting && !m_hasColumns) + paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks. + + // 4. paint floats. + if (!inlineFlow && (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip)) { + if (m_hasColumns) + paintColumns(paintInfo, scrolledX, scrolledY, true); + else + paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip); + } + + // 5. paint outline. + if (!inlineFlow && (paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE) + RenderObject::paintOutline(paintInfo.context, tx, ty, width(), height(), style()); + + // 6. paint continuation outlines. + if (!inlineFlow && (paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) { + if (continuation() && continuation()->hasOutline() && continuation()->style()->visibility() == VISIBLE) { + RenderFlow* inlineFlow = static_cast<RenderFlow*>(continuation()->element()->renderer()); + if (!inlineFlow->hasLayer()) + containingBlock()->addContinuationWithOutline(inlineFlow); + else if (!inlineFlow->firstLineBox()) + inlineFlow->paintOutline(paintInfo.context, tx - xPos() + inlineFlow->containingBlock()->xPos(), + ty - yPos() + inlineFlow->containingBlock()->yPos()); + } + 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 (!inlineFlow && 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<FloatingObject> 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->hasLayer()) { + PaintInfo currentPaintInfo(paintInfo); + currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground; + int currentTX = tx + r->m_left - r->m_renderer->xPos() + r->m_renderer->marginLeft(); + int currentTY = ty + r->m_top - r->m_renderer->yPos() + 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 (!shouldPaintWithinRoot(paintInfo) || !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()->yPos(); + int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos(); + 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->yPos(); + h = curr->height(); + if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y()) + curr->paintEllipsisBox(paintInfo, tx, ty); + } + } +} + +ContinuationOutlineTableMap* continuationOutlineTable() +{ + DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ()); + return &table; +} + +void RenderBlock::addContinuationWithOutline(RenderFlow* 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()); + + ContinuationOutlineTableMap* table = continuationOutlineTable(); + RenderFlowSequencedSet* continuations = table->get(this); + if (!continuations) { + continuations = new RenderFlowSequencedSet; + table->set(this, continuations); + } + + continuations->add(flow); +} + +void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty) +{ + ContinuationOutlineTableMap* table = continuationOutlineTable(); + if (table->isEmpty()) + return; + + RenderFlowSequencedSet* continuations = table->get(this); + if (!continuations) + return; + + // Paint each continuation outline. + RenderFlowSequencedSet::iterator end = continuations->end(); + for (RenderFlowSequencedSet::iterator it = continuations->begin(); it != end; ++it) { + // Need to add in the coordinates of the intervening blocks. + RenderFlow* flow = *it; + RenderBlock* block = flow->containingBlock(); + for ( ; block && block != this; block = block->containingBlock()) { + tx += block->xPos(); + ty += block->yPos(); + } + ASSERT(block); + flow->paintOutline(info.context, tx, ty); + } + + // Delete + delete continuations; + table->remove(this); +} + +void RenderBlock::setSelectionState(SelectionState s) +{ + if (selectionState() == s) + return; + + if (s == SelectionInside && selectionState() != SelectionNone) + return; + + if ((s == SelectionStart && selectionState() == SelectionEnd) || + (s == SelectionEnd && selectionState() == SelectionStart)) + m_selectionState = SelectionBoth; + else + m_selectionState = s; + + RenderBlock* cb = containingBlock(); + if (cb && !cb->isRenderView()) + cb->setSelectionState(s); +} + +bool RenderBlock::shouldPaintSelectionGaps() const +{ + return m_selectionState != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot(); +} + +bool RenderBlock::isSelectionRoot() const +{ + if (!element()) + 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()->element(); + if (startElement && startElement->rootEditableElement() == element()) + return true; + } + + return false; +} + +GapRects RenderBlock::selectionGapRects() +{ + ASSERT(!needsLayout()); + + if (!shouldPaintSelectionGaps()) + return GapRects(); + + // FIXME: this is broken with transforms + FloatPoint absContentPoint = localToAbsoluteForContent(FloatPoint()); + if (hasOverflowClip()) + absContentPoint -= layer()->scrolledContentOffset(); + + int lastTop = -borderTopExtra(); + int lastLeft = leftSelectionOffset(this, lastTop); + int lastRight = rightSelectionOffset(this, lastTop); + + return fillSelectionGaps(this, absContentPoint.x(), absContentPoint.y(), absContentPoint.x(), absContentPoint.y(), lastTop, lastLeft, lastRight); +} + +void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty) +{ + if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) { + int lastTop = -borderTopExtra(); + int lastLeft = leftSelectionOffset(this, lastTop); + int lastRight = rightSelectionOffset(this, lastTop); + paintInfo.context->save(); + fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo); + paintInfo.context->restore(); + } +} + +static void clipOutPositionedObjects(const RenderObject::PaintInfo* paintInfo, int tx, int ty, ListHashSet<RenderObject*>* positionedObjects) +{ + if (!positionedObjects) + return; + + ListHashSet<RenderObject*>::const_iterator end = positionedObjects->end(); + for (ListHashSet<RenderObject*>::const_iterator it = positionedObjects->begin(); it != end; ++it) { + RenderObject* r = *it; + paintInfo->context->clipOut(IntRect(tx + r->xPos(), ty + r->yPos(), r->width(), r->height())); + } +} + +GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, + int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) +{ + // 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 <body> must make sure to examine its containingBlock's positioned objects. + for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock()) + clipOutPositionedObjects(paintInfo, cb->xPos(), cb->yPos(), cb->m_positionedObjects); + if (m_floatingObjects) { + for (DeprecatedPtrListIterator<FloatingObject> 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())); + } + } + } + + // 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 (m_hasColumns || hasTransform()) { + // 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 && (m_selectionState != SelectionBoth && m_selectionState != SelectionEnd)) + result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height() + borderBottomExtra(), + 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. <hr>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) + // Selection 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->bottomOverflow(); + lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow()); + lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow()); + } + 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. + RenderObject* curr; + for (curr = firstChild(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSibling()) { } + + for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSibling()) { + 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->yPos(), 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->xPos(), curr->yPos(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo)); + if (rightGap) + result.uniteRight(fillRightSelectionGap(this, curr->xPos() + curr->width(), curr->yPos(), 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->yPos() + curr->height()); + lastLeft = leftSelectionOffset(rootBlock, curr->yPos() + curr->height()); + lastRight = rightSelectionOffset(rootBlock, curr->yPos() + curr->height()); + } else if (childState != SelectionNone) + // We must be a block that has some selected object inside it. Go ahead and recur. + result.unite(static_cast<RenderBlock*>(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->xPos(), ty + curr->yPos(), + 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()); + 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()); + 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()); + 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()); + 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 y) +{ + int left = leftOffset(y); + if (left == borderLeft() + paddingLeft()) { + if (rootBlock != this) + // The border can potentially be further extended by our containingBlock(). + return containingBlock()->leftSelectionOffset(rootBlock, y + yPos()); + return left; + } + else { + RenderBlock* cb = this; + while (cb != rootBlock) { + left += cb->xPos(); + cb = cb->containingBlock(); + } + } + + return left; +} + +int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int y) +{ + int right = rightOffset(y); + if (right == (contentWidth() + (borderLeft() + paddingLeft()))) { + if (rootBlock != this) + // The border can potentially be further extended by our containingBlock(). + return containingBlock()->rightSelectionOffset(rootBlock, y + yPos()); + return right; + } + else { + RenderBlock* cb = this; + while (cb != rootBlock) { + right += cb->xPos(); + cb = cb->containingBlock(); + } + } + return right; +} + +void RenderBlock::insertPositionedObject(RenderObject *o) +{ + // Create the list of special objects if we don't aleady have one + if (!m_positionedObjects) + m_positionedObjects = new ListHashSet<RenderObject*>; + + m_positionedObjects->add(o); +} + +void RenderBlock::removePositionedObject(RenderObject *o) +{ + if (m_positionedObjects) + m_positionedObjects->remove(o); +} + +void RenderBlock::removePositionedObjects(RenderBlock* o) +{ + if (!m_positionedObjects) + return; + + RenderObject* r; + + Iterator end = m_positionedObjects->end(); + + Vector<RenderObject*, 16> 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(RenderObject *o) +{ + ASSERT(o->isFloating()); + + // Create the list of special objects if we don't aleady have one + if (!m_floatingObjects) { + m_floatingObjects = new DeprecatedPtrList<FloatingObject>; + m_floatingObjects->setAutoDelete(true); + } else { + // Don't insert the object again if it's already in the list + DeprecatedPtrListIterator<FloatingObject> 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->hasLayer(); // 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(RenderObject *o) +{ + if (m_floatingObjects) { + DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); + while (it.current()) { + if (it.current()->m_renderer == o) { + if (childrenInline()) + markLinesDirtyInVerticalRange(0, it.current()->m_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 = m_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; + } + + RenderObject* 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->xPos(), o->yPos() , 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->setPos(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->setPos(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 (m_height < newY) + m_height = newY; +} + +void RenderBlock::addPercentHeightDescendant(RenderBox* descendant) +{ + if (!gPercentHeightDescendantsMap) { + gPercentHeightDescendantsMap = new PercentHeightDescendantsMap; + gPercentHeightContainerMap = new PercentHeightContainerMap; + } + + HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->get(this); + if (!descendantSet) { + descendantSet = new HashSet<RenderBox*>; + gPercentHeightDescendantsMap->set(this, descendantSet); + } + bool added = descendantSet->add(descendant).second; + if (!added) { + ASSERT(gPercentHeightContainerMap->get(descendant)); + ASSERT(gPercentHeightContainerMap->get(descendant)->contains(this)); + return; + } + + HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(descendant); + if (!containerSet) { + containerSet = new HashSet<RenderBlock*>; + gPercentHeightContainerMap->set(descendant, containerSet); + } + ASSERT(!containerSet->contains(this)); + containerSet->add(this); +} + +void RenderBlock::removePercentHeightDescendant(RenderBox* descendant) +{ + if (!gPercentHeightContainerMap) + return; + + HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->take(descendant); + if (!containerSet) + return; + + HashSet<RenderBlock*>::iterator end = containerSet->end(); + for (HashSet<RenderBlock*>::iterator it = containerSet->begin(); it != end; ++it) { + RenderBlock* container = *it; + HashSet<RenderBox*>* 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; +} + +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<FloatingObject> 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 && m_firstLine && 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<FloatingObject> 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 && m_firstLine && 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) const +{ + int result = rightOffset(y) - leftOffset(y); + return (result < 0) ? 0 : result; +} + +int RenderBlock::nextFloatBottomBelow(int height) const +{ + if (!m_floatingObjects) + return 0; + + int bottom = INT_MAX; + FloatingObject* r; + DeprecatedPtrListIterator<FloatingObject> 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<FloatingObject> it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) + if (r->m_bottom>bottom) + bottom=r->m_bottom; + return bottom; +} + +IntRect RenderBlock::floatRect() const +{ + IntRect result; + if (!m_floatingObjects || hasOverflowClip()) + return result; + FloatingObject* r; + DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); + for (; (r = it.current()); ++it) { + if (r->m_shouldPaint && !r->m_renderer->hasLayer()) { + IntRect childRect = r->m_renderer->overflowRect(false); + childRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop()); + result.unite(childRect); + } + } + + return result; +} + +int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int bottom = RenderFlow::lowestPosition(includeOverflowInterior, includeSelf); + if (!includeOverflowInterior && hasOverflowClip()) + return bottom; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetY() : 0; + + if (includeSelf) + bottom = max(bottom, m_overflowHeight + relativeOffset); + + if (m_positionedObjects) { + RenderObject* 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->xPos() + r->width() > 0 || r->xPos() + r->rightmostPosition(false) > 0) { + int lp = r->yPos() + r->lowestPosition(false); + bottom = max(bottom, lp + relativeOffset); + } + } + } + } + + if (m_hasColumns) { + Vector<IntRect>* 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<FloatingObject> it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasLayer()) { + int lp = r->m_top + r->m_renderer->marginTop() + r->m_renderer->lowestPosition(false); + bottom = max(bottom, lp + relativeOffset); + } + } + } + + + if (!includeSelf && lastLineBox()) { + int lp = lastLineBox()->yPos() + lastLineBox()->height(); + bottom = max(bottom, lp); + } + + return bottom; +} + +int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int right = RenderFlow::rightmostPosition(includeOverflowInterior, includeSelf); + if (!includeOverflowInterior && hasOverflowClip()) + return right; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; + + if (includeSelf) + right = max(right, m_overflowWidth + relativeOffset); + + if (m_positionedObjects) { + RenderObject* 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->yPos() + r->height() > 0 || r->yPos() + r->lowestPosition(false) > 0) { + int rp = r->xPos() + r->rightmostPosition(false); + right = max(right, rp + relativeOffset); + } + } + } + } + + if (m_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<FloatingObject> it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasLayer()) { + int rp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->rightmostPosition(false); + right = max(right, rp + relativeOffset); + } + } + } + + if (!includeSelf && firstLineBox()) { + for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) { + int rp = currBox->xPos() + 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()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR) + rp += 1; + right = max(right, rp); + } + } + + return right; +} + +int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const +{ + int left = RenderFlow::leftmostPosition(includeOverflowInterior, includeSelf); + if (!includeOverflowInterior && hasOverflowClip()) + return left; + + int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; + + if (includeSelf) + left = min(left, m_overflowLeft + relativeOffset); + + if (m_positionedObjects) { + RenderObject* 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->yPos() + r->height() > 0 || r->yPos() + r->lowestPosition(false) > 0) { + int lp = r->xPos() + r->leftmostPosition(false); + left = min(left, lp + relativeOffset); + } + } + } + } + + if (m_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<FloatingObject> it(*m_floatingObjects); + for ( ; (r = it.current()); ++it ) { + if (r->m_shouldPaint || r->m_renderer->hasLayer()) { + int lp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->leftmostPosition(false); + left = min(left, lp + relativeOffset); + } + } + } + + if (!includeSelf && firstLineBox()) { + for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) + left = min(left, (int)currBox->xPos()); + } + + return left; +} + +int +RenderBlock::leftBottom() +{ + if (!m_floatingObjects) return 0; + int bottom=0; + FloatingObject* r; + DeprecatedPtrListIterator<FloatingObject> 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<FloatingObject> 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) +{ + if (top >= bottom) + return; + + RootInlineBox* lowestDirtyLine = lastRootBox(); + RootInlineBox* afterLowest = lowestDirtyLine; + while (lowestDirtyLine && lowestDirtyLine->blockHeight() >= bottom) { + afterLowest = lowestDirtyLine; + lowestDirtyLine = lowestDirtyLine->prevRootBox(); + } + + while (afterLowest && 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<RenderObject*, FloatingObject*> 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(); + } + + // 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->isRenderBlock() || prev->avoidsFloats() || prev->isFloatingOrPositioned())) { + if (prev->isFloating()) + parentHasFloats = true; + prev = prev->previousSibling(); + } + + // First add in floats from the parent. + int offset = m_y; + if (parentHasFloats) + addIntrudingFloats(static_cast<RenderBlock *>(parent()), + parent()->borderLeft() + parent()->paddingLeft(), offset); + + int xoffset = 0; + if (prev) + offset -= prev->yPos(); + else { + prev = parent(); + xoffset += prev->borderLeft() + prev->paddingLeft(); + } + + // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space. + if (!prev->isRenderBlock()) return; + RenderBlock* block = static_cast<RenderBlock *>(prev); + + if (block->m_floatingObjects && block->floatBottom() > offset) + addIntrudingFloats(block, xoffset, offset); + + if (childrenInline()) { + int changeTop = INT_MAX; + int changeBottom = INT_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., <html>. + if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot()) + return 0; + + int lowestFloatBottom = 0; + + // Floats that will remain the child's responsiblity to paint should factor into its + // visual overflow. + IntRect floatsOverflowRect; + DeprecatedPtrListIterator<FloatingObject> it(*child->m_floatingObjects); + for (FloatingObject* r; (r = it.current()); ++it) { + int bottom = child->yPos() + 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 layer boundary. + if (r->m_renderer->enclosingLayer() == enclosingLayer()) + r->m_shouldPaint = false; + else + floatingObj->m_shouldPaint = false; + + // We create the floating object list lazily. + if (!m_floatingObjects) { + m_floatingObjects = new DeprecatedPtrList<FloatingObject>; + m_floatingObjects->setAutoDelete(true); + } + m_floatingObjects->append(floatingObj); + } + } else if (makeChildPaintOtherFloats && !r->m_shouldPaint && !r->m_renderer->hasLayer() && 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->hasLayer()) { + IntRect floatOverflowRect = r->m_renderer->overflowRect(false); + floatOverflowRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop()); + floatsOverflowRect.unite(floatOverflowRect); + } + } + child->addVisualOverflow(floatsOverflowRect); + 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<FloatingObject> 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<FloatingObject> 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<FloatingObject>; + 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 RenderFlow::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth(); +} + +bool RenderBlock::containsFloat(RenderObject* o) +{ + if (m_floatingObjects) { + DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); + while (it.current()) { + if (it.current()->m_renderer == o) + return true; + ++it; + } + } + return false; +} + +void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderObject* floatToRemove) +{ + setChildNeedsLayout(true); + + if (floatToRemove) + removeFloatingObject(floatToRemove); + + // Iterate over our children and mark them as needed. + if (!childrenInline()) { + for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { + if (isBlockFlow() && !child->isFloatingOrPositioned() && + ((floatToRemove ? child->containsFloat(floatToRemove) : child->containsFloats()) || child->shrinkToAvoidFloats())) + child->markAllDescendantsWithFloatsForLayout(floatToRemove); + } + } +} + +int RenderBlock::getClearDelta(RenderObject *child) +{ + // 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). + // FIXME: Note that the remaining space checks aren't quite accurate, since you should be able to clear only some floats (the minimum # needed + // to fit) and not all (we should be using nextFloatBottomBelow and looping). + // Do not allow tables to wrap in quirks or even in almost strict mode + // (ebay on the PLT, finance.yahoo.com in the real world, versiontracker.com forces even almost strict mode not to work) + int result = clearSet ? max(0, bottom - child->yPos()) : 0; + if (!result && child->avoidsFloats() && child->style()->width().isFixed() && + child->minPrefWidth() > lineWidth(child->yPos()) && child->minPrefWidth() <= availableWidth() && + document()->inStrictMode()) + result = max(0, floatBottom() - child->yPos()); + return result; +} + +void RenderBlock::addVisualOverflow(const IntRect& r) +{ + if (r.isEmpty()) + return; + m_overflowLeft = min(m_overflowLeft, r.x()); + m_overflowWidth = max(m_overflowWidth, r.right()); + m_overflowTop = min(m_overflowTop, r.y()); + m_overflowHeight = max(m_overflowHeight, r.bottom()); +} + +bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int, int, int, int) +{ + if (!scrollsOverflow()) + return false; + + return layer()->hitTestOverflowControls(result); +} + +bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction) +{ + bool inlineFlow = isInlineFlow(); + + int tx = _tx + m_x; + int ty = _ty + m_y + borderTopExtra(); + + if (!inlineFlow && !isRenderView()) { + // Check if we need to do anything at all. + IntRect overflowBox = overflowRect(false); + overflowBox.move(tx, ty); + if (!overflowBox.contains(_x, _y)) + return false; + } + + if (isPointInOverflowControl(result, _x, _y, tx, ty)) { + if (hitTestAction == HitTestBlockBackground) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); + return true; + } + return false; + } + + // If we have lightweight control clipping, then we can't have any spillout. + if (!hasControlClip() || controlClipRect(tx, ty).contains(_x, _y)) { + // Hit test descendants first. + int scrolledX = tx; + int scrolledY = ty; + if (hasOverflowClip()) + m_layer->subtractScrolledContentOffset(scrolledX, scrolledY); + + // Hit test contents if we don't have columns. + if (!m_hasColumns && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) + return true; + + // Hit test our columns if we do have them. + if (m_hasColumns && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) + return true; + + // Hit test floats. + if (hitTestAction == HitTestFloat && m_floatingObjects) { + if (isRenderView()) { + scrolledX += static_cast<RenderView*>(this)->frameView()->scrollX(); + scrolledY += static_cast<RenderView*>(this)->frameView()->scrollY(); + } + + FloatingObject* o; + DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); + for (it.toLast(); (o = it.current()); --it) { + if (o->m_shouldPaint && !o->m_renderer->hasLayer()) { + int xoffset = scrolledX + o->m_left + o->m_renderer->marginLeft() - o->m_renderer->xPos(); + int yoffset = scrolledY + o->m_top + o->m_renderer->marginTop() - o->m_renderer->yPos(); + 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 (!inlineFlow && (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground)) { + int topExtra = borderTopExtra(); + IntRect boundsRect(tx, ty - topExtra, m_width, m_height + topExtra + borderBottomExtra()); + if (visibleToHitTesting() && boundsRect.contains(_x, _y)) { + updateHitTestResult(result, IntPoint(_x - tx, _y - ty + topExtra)); + 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. + // We can always go left to right, since column contents are clipped (meaning that there + // can't be any overlap). + int currXOffset = 0; + int currYOffset = 0; + int colGap = columnGap(); + Vector<IntRect>* colRects = columnRects(); + for (unsigned i = 0; i < colRects->size(); i++) { + IntRect colRect = colRects->at(i); + colRect.move(tx, ty); + + if (colRect.contains(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; + return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction); + } + + // Move to the next position. + if (style()->direction() == LTR) + currXOffset += colRect.width() + colGap; + else + currXOffset -= (colRect.width() + colGap); + + currYOffset -= colRect.height(); + } + + 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 (hitTestLines(request, result, x, y, tx, ty, hitTestAction)) { + updateHitTestResult(result, IntPoint(x - tx, y - ty)); + return true; + } + } else { + // Hit test our children. + HitTestAction childHitTest = hitTestAction; + if (hitTestAction == HitTestChildBlockBackgrounds) + childHitTest = HitTestChildBlockBackground; + for (RenderObject* child = lastChild(); child; child = child->previousSibling()) { + // FIXME: We have to skip over inline flows, since they can show up inside RenderTables at the moment (a demoted inline <form> for example). If we ever implement a + // table-specific hit-test method (which we should do for performance reasons anyway), then we can remove this check. + if (!child->hasLayer() && !child->isFloating() && !child->isInlineFlow() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) { + updateHitTestResult(result, IntPoint(x - tx, y - ty)); + return true; + } + } + } + + return false; +} + +Position RenderBlock::positionForBox(InlineBox *box, bool start) const +{ + if (!box) + return Position(); + + if (!box->object()->element()) + return Position(element(), start ? caretMinOffset() : caretMaxOffset()); + + if (!box->isInlineTextBox()) + return Position(box->object()->element(), start ? box->object()->caretMinOffset() : box->object()->caretMaxOffset()); + + InlineTextBox *textBox = static_cast<InlineTextBox *>(box); + return Position(box->object()->element(), start ? textBox->start() : textBox->start() + textBox->len()); +} + +Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const +{ + if (!renderer) + return Position(element(), 0); + + Node* node = renderer->element() ? renderer->element() : element(); + if (!node) + return Position(); + + ASSERT(renderer == node->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(!node->isCharacterDataNode() || renderer->isText()); + + return Position(node, offset); +} + +VisiblePosition RenderBlock::positionForCoordinates(int x, int y) +{ + if (isTable()) + return RenderFlow::positionForCoordinates(x, y); + + int top = borderTop(); + int bottom = top + borderTopExtra() + paddingTop() + contentHeight() + paddingBottom() + borderBottomExtra(); + + int left = borderLeft(); + int right = left + paddingLeft() + contentWidth() + paddingRight(); + + Node* n = element(); + + int contentsX = x; + int contentsY = y; + offsetForContents(contentsX, contentsY); + + if (isReplaced()) { + if (y < 0 || y < height() && x < 0) + return VisiblePosition(n, caretMinOffset(), DOWNSTREAM); + if (y >= height() || y >= 0 && x >= width()) + return VisiblePosition(n, caretMaxOffset(), DOWNSTREAM); + } + + // If we start inside the shadow tree, we will stay inside (even if the point is above or below). + if (!(n && n->isShadowNode()) && !childrenInline()) { + // Don't return positions inside editable roots for coordinates outside those roots, except for coordinates outside + // a document that is entirely editable. + bool isEditableRoot = n && n->rootEditableElement() == n && !n->hasTagName(bodyTag) && !n->hasTagName(htmlTag); + + if (y < top || (isEditableRoot && (y < bottom && x < left))) { + if (!isEditableRoot) + if (RenderObject* c = firstChild()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float or a compact, etc. + VisiblePosition p = c->positionForCoordinates(contentsX - c->xPos(), contentsY - c->yPos()); + if (p.isNotNull()) + return p; + } + if (n) { + if (Node* sp = n->shadowParentNode()) + n = sp; + if (Node* p = n->parent()) + return VisiblePosition(p, n->nodeIndex(), DOWNSTREAM); + } + return VisiblePosition(n, 0, DOWNSTREAM); + } + + if (y >= bottom || (isEditableRoot && (y >= top && x >= right))) { + if (!isEditableRoot) + if (RenderObject* c = lastChild()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float or a compact, ect. + VisiblePosition p = c->positionForCoordinates(contentsX - c->xPos(), contentsY - c->yPos()); + if (p.isNotNull()) + return p; + } + if (n) { + if (Node* sp = n->shadowParentNode()) + n = sp; + if (Node* p = n->parent()) + return VisiblePosition(p, n->nodeIndex() + 1, DOWNSTREAM); + } + return VisiblePosition(n, 0, DOWNSTREAM); + } + } + + if (childrenInline()) { + if (!firstRootBox()) + return VisiblePosition(n, 0, DOWNSTREAM); + + if (contentsY < firstRootBox()->topOverflow() - verticalLineClickFudgeFactor) + // y coordinate is above first root line box + return VisiblePosition(positionForBox(firstRootBox()->firstLeafChild(), true), DOWNSTREAM); + + // look for the closest line box in the root box which is at the passed-in y coordinate + for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) { + // set the bottom based on whether there is a next root box + if (root->nextRootBox()) + // FIXME: make the break point halfway between the bottom of the previous root box and the top of the next root box + bottom = root->nextRootBox()->topOverflow(); + else + bottom = root->bottomOverflow() + verticalLineClickFudgeFactor; + // check if this root line box is located at this y coordinate + if (contentsY < bottom && root->firstChild()) { + InlineBox* closestBox = root->closestLeafChildForXPos(x); + if (closestBox) + // pass the box a y position that is inside it + return closestBox->object()->positionForCoordinates(contentsX, closestBox->m_y); + } + } + + if (lastRootBox()) + // y coordinate is below last root line box + return VisiblePosition(positionForBox(lastRootBox()->lastLeafChild(), false), DOWNSTREAM); + + return VisiblePosition(n, 0, DOWNSTREAM); + } + + // See if any child blocks exist at this y coordinate. + if (firstChild() && contentsY < firstChild()->yPos()) + return VisiblePosition(n, 0, DOWNSTREAM); + for (RenderObject* renderer = firstChild(); renderer; renderer = renderer->nextSibling()) { + if (renderer->height() == 0 || renderer->style()->visibility() != VISIBLE || renderer->isFloatingOrPositioned()) + continue; + RenderObject* next = renderer->nextSibling(); + while (next && next->isFloatingOrPositioned()) + next = next->nextSibling(); + if (next) + bottom = next->yPos(); + else + bottom = top + scrollHeight(); + if (contentsY >= renderer->yPos() && contentsY < bottom) + return renderer->positionForCoordinates(contentsX - renderer->xPos(), contentsY - renderer->yPos()); + } + + return RenderFlow::positionForCoordinates(x, y); +} + +void RenderBlock::offsetForContents(int& tx, int& ty) const +{ + ty -= borderTopExtra(); + + if (hasOverflowClip()) + m_layer->addScrolledContentOffset(tx, ty); + + if (m_hasColumns) { + IntPoint contentsPoint(tx, ty); + 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 (m_hasColumns) + return desiredColumnWidth(); + return contentWidth(); +} + +int RenderBlock::columnGap() const +{ + if (style()->hasNormalColumnGap()) + return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins. + return static_cast<int>(style()->columnGap()); +} + +void RenderBlock::calcColumnWidth() +{ + // Calculate our column width and column count. + unsigned desiredColumnCount = 1; + int desiredColumnWidth = contentWidth(); + + // For now, we don't support multi-column layouts when printing, since we have to do a lot of work for proper pagination. + if (document()->printing() || (style()->hasAutoColumnCount() && style()->hasAutoColumnWidth())) { + setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth); + return; + } + + int availWidth = desiredColumnWidth; + int colGap = columnGap(); + int colWidth = max(1, static_cast<int>(style()->columnWidth())); + int colCount = max(1, static_cast<int>(style()->columnCount())); + + if (style()->hasAutoColumnWidth()) { + if ((colCount - 1) * colGap < availWidth) { + desiredColumnCount = colCount; + desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount; + } else if (colGap < availWidth) { + desiredColumnCount = availWidth / colGap; + desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount; + } + } else if (style()->hasAutoColumnCount()) { + if (colWidth < availWidth) { + desiredColumnCount = (availWidth + colGap) / (colWidth + colGap); + desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount; + } + } else { + // Both are set. + if (colCount * colWidth + (colCount - 1) * colGap <= availWidth) { + desiredColumnCount = colCount; + desiredColumnWidth = colWidth; + } else if (colWidth < availWidth) { + desiredColumnCount = (availWidth + colGap) / (colWidth + colGap); + desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount; + } + } + setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth); +} + +void RenderBlock::setDesiredColumnCountAndWidth(int count, int width) +{ + if (count == 1) { + if (m_hasColumns) { + delete gColumnInfoMap->take(this); + m_hasColumns = false; + } + } else { + ColumnInfo* info; + if (m_hasColumns) + info = gColumnInfoMap->get(this); + else { + if (!gColumnInfoMap) + gColumnInfoMap = new ColumnInfoMap; + info = new ColumnInfo; + gColumnInfoMap->add(this, info); + m_hasColumns = true; + } + info->m_desiredColumnCount = count; + info->m_desiredColumnWidth = width; + } +} + +int RenderBlock::desiredColumnWidth() const +{ + if (!m_hasColumns) + return contentWidth(); + return gColumnInfoMap->get(this)->m_desiredColumnWidth; +} + +unsigned RenderBlock::desiredColumnCount() const +{ + if (!m_hasColumns) + return 1; + return gColumnInfoMap->get(this)->m_desiredColumnCount; +} + +Vector<IntRect>* RenderBlock::columnRects() const +{ + if (!m_hasColumns) + return 0; + return &gColumnInfoMap->get(this)->m_columnRects; +} + +int RenderBlock::layoutColumns(int endOfContent) +{ + // Don't do anything if we have no columns + if (!m_hasColumns) + return -1; + + ColumnInfo* info = gColumnInfoMap->get(this); + int desiredColumnWidth = info->m_desiredColumnWidth; + int desiredColumnCount = info->m_desiredColumnCount; + Vector<IntRect>* columnRects = &info->m_columnRects; + + bool computeIntrinsicHeight = (endOfContent == -1); + + // Fill the columns in to the available height. Attempt to balance the height of the columns + int availableHeight = contentHeight(); + int colHeight = computeIntrinsicHeight ? availableHeight / desiredColumnCount : availableHeight; + + // Add in half our line-height to help with best-guess initial balancing. + int columnSlop = lineHeight(false) / 2; + int remainingSlopSpace = columnSlop * desiredColumnCount; + + if (computeIntrinsicHeight) + colHeight += columnSlop; + + int colGap = columnGap(); + + // Compute a collection of column rects. + columnRects->clear(); + + // Then we do a simulated "paint" into the column slices and allow the content to slightly adjust our individual column rects. + // FIXME: We need to take into account layers that are affected by the columns as well here so that they can have an opportunity + // to adjust column rects also. + RenderView* v = view(); + int left = borderLeft() + paddingLeft(); + int top = borderTop() + paddingTop(); + int currX = style()->direction() == LTR ? borderLeft() + paddingLeft() : borderLeft() + paddingLeft() + contentWidth() - desiredColumnWidth; + int currY = top; + unsigned colCount = desiredColumnCount; + int maxColBottom = borderTop() + paddingTop(); + int contentBottom = top + availableHeight; + for (unsigned i = 0; i < colCount; i++) { + // If we aren't constrained, then the last column can just get all the remaining space. + if (computeIntrinsicHeight && i == colCount - 1) + colHeight = availableHeight; + + // This represents the real column position. + IntRect colRect(currX, top, desiredColumnWidth, colHeight); + + // For the simulated paint, we pretend like everything is in one long strip. + IntRect pageRect(left, currY, desiredColumnWidth, colHeight); + v->setPrintRect(pageRect); + v->setTruncatedAt(currY + colHeight); + GraphicsContext context((PlatformGraphicsContext*)0); + RenderObject::PaintInfo paintInfo(&context, pageRect, PaintPhaseForeground, false, 0, 0); + + m_hasColumns = false; + paintObject(paintInfo, 0, 0); + m_hasColumns = true; + + int adjustedBottom = v->bestTruncatedAt(); + if (adjustedBottom <= currY) + adjustedBottom = currY + colHeight; + + colRect.setHeight(adjustedBottom - currY); + + // Add in the lost space to the subsequent columns. + // FIXME: This will create a "staircase" effect if there are enough columns, but the effect should be pretty subtle. + if (computeIntrinsicHeight) { + int lostSpace = colHeight - colRect.height(); + if (lostSpace > remainingSlopSpace) { + // Redestribute the space among the remaining columns. + int spaceToRedistribute = lostSpace - remainingSlopSpace; + int remainingColumns = colCount - i + 1; + colHeight += spaceToRedistribute / remainingColumns; + } + remainingSlopSpace = max(0, remainingSlopSpace - lostSpace); + } + + if (style()->direction() == LTR) + currX += desiredColumnWidth + colGap; + else + currX -= (desiredColumnWidth + colGap); + + currY += colRect.height(); + availableHeight -= colRect.height(); + + maxColBottom = max(colRect.bottom(), maxColBottom); + + columnRects->append(colRect); + + // Start adding in more columns as long as there's still content left. + if (currY < endOfContent && i == colCount - 1 && (computeIntrinsicHeight || contentHeight())) + colCount++; + } + + m_overflowWidth = max(m_width, currX - colGap); + m_overflowLeft = min(0, currX + desiredColumnWidth + colGap); + + m_overflowHeight = maxColBottom; + int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight(); + + if (computeIntrinsicHeight) + m_height = m_overflowHeight + toAdd; + + v->setPrintRect(IntRect()); + v->setTruncatedAt(0); + + ASSERT(colCount == columnRects->size()); + + return contentBottom; +} + +void RenderBlock::adjustPointToColumnContents(IntPoint& point) const +{ + // Just bail if we have no columns. + if (!m_hasColumns) + return; + + Vector<IntRect>* colRects = columnRects(); + + // Determine which columns we intersect. + int colGap = columnGap(); + int leftGap = colGap / 2; + IntPoint columnPoint(colRects->at(0).location()); + int yOffset = 0; + for (unsigned i = 0; i < colRects->size(); i++) { + // Add in half the column gap to the left and right of the rect. + IntRect colRect = colRects->at(i); + IntRect gapAndColumnRect(colRect.x() - leftGap, colRect.y(), colRect.width() + colGap, colRect.height()); + + if (gapAndColumnRect.contains(point)) { + // We're inside the column. Translate the x and y into our column coordinate space. + point.move(columnPoint.x() - colRect.x(), yOffset); + return; + } + + // Move to the next position. + yOffset += colRect.height(); + } +} + +void RenderBlock::adjustRectForColumns(IntRect& r) const +{ + // Just bail if we have no columns. + if (!m_hasColumns) + return; + + Vector<IntRect>* colRects = columnRects(); + + // Begin with a result rect that is empty. + IntRect result; + + // Determine which columns we intersect. + int currXOffset = 0; + int currYOffset = 0; + int colGap = columnGap(); + for (unsigned i = 0; i < colRects->size(); i++) { + IntRect colRect = colRects->at(i); + + IntRect repaintRect = r; + repaintRect.move(currXOffset, currYOffset); + + repaintRect.intersect(colRect); + + result.unite(repaintRect); + + // Move to the next position. + if (style()->direction() == LTR) + currXOffset += colRect.width() + colGap; + else + currXOffset -= (colRect.width() + colGap); + + currYOffset -= colRect.height(); + } + + r = result; +} + +void RenderBlock::calcPrefWidths() +{ + ASSERT(prefWidthsDirty()); + + updateFirstLetter(); + + if (!isTableCell() && style()->width().isFixed() && style()->width().value() > 0) + m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(style()->width().value()); + else { + m_minPrefWidth = 0; + m_maxPrefWidth = 0; + + if (childrenInline()) + calcInlinePrefWidths(); + else + calcBlockPrefWidths(); + + m_maxPrefWidth = max(m_minPrefWidth, m_maxPrefWidth); + + if (!style()->autoWrap() && childrenInline()) { + m_minPrefWidth = m_maxPrefWidth; + + // A horizontal marquee with inline children has no minimum width. + if (m_layer && m_layer->marquee() && m_layer->marquee()->isHorizontal()) + m_minPrefWidth = 0; + } + + if (isTableCell()) { + Length w = static_cast<const RenderTableCell*>(this)->styleOrColWidth(); + if (w.isFixed() && w.value() > 0) + m_maxPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(w.value())); + } + } + + if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) { + m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value())); + m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value())); + } + + if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) { + m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value())); + m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value())); + } + + int toAdd = 0; + toAdd = borderLeft() + borderRight() + paddingLeft() + paddingRight(); + + m_minPrefWidth += toAdd; + m_maxPrefWidth += toAdd; + + setPrefWidthsDirty(false); +} + +struct InlineMinMaxIterator +{ +/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to + inline min/max width calculations. Note the following about the way it walks: + (1) Positioned content is skipped (since it does not contribute to min/max width of a block) + (2) We do not drill into the children of floats or replaced elements, since you can't break + in the middle of such an element. + (3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have + distinct borders/margin/padding that contribute to the min/max width. +*/ + RenderObject* parent; + RenderObject* current; + bool endOfInline; + + InlineMinMaxIterator(RenderObject* p, bool end = false) + :parent(p), current(p), endOfInline(end) {} + + RenderObject* next(); +}; + +RenderObject* InlineMinMaxIterator::next() +{ + RenderObject* result = 0; + bool oldEndOfInline = endOfInline; + endOfInline = false; + while (current || current == parent) { + if (!oldEndOfInline && + (current == parent || + (!current->isFloating() && !current->isReplaced() && !current->isPositioned()))) + result = current->firstChild(); + if (!result) { + // We hit the end of our inline. (It was empty, e.g., <span></span>.) + if (!oldEndOfInline && current->isInlineFlow()) { + result = current; + endOfInline = true; + break; + } + + while (current && current != parent) { + result = current->nextSibling(); + if (result) break; + current = current->parent(); + if (current && current != parent && current->isInlineFlow()) { + result = current; + endOfInline = true; + break; + } + } + } + + if (!result) + break; + + if (!result->isPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isInlineFlow())) + break; + + current = result; + result = 0; + } + + // Update our position. + current = result; + return current; +} + +static int getBPMWidth(int childValue, Length cssUnit) +{ + if (cssUnit.type() != Auto) + return (cssUnit.isFixed() ? cssUnit.value() : childValue); + return 0; +} + +static int getBorderPaddingMargin(const RenderObject* child, bool endOfInline) +{ + RenderStyle* cstyle = child->style(); + int result = 0; + bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline; + result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()), + (leftSide ? cstyle->marginLeft() : + cstyle->marginRight())); + result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()), + (leftSide ? cstyle->paddingLeft() : + cstyle->paddingRight())); + result += leftSide ? child->borderLeft() : child->borderRight(); + return result; +} + +static inline void stripTrailingSpace(int& inlineMax, int& inlineMin, + RenderObject* trailingSpaceChild) +{ + if (trailingSpaceChild && trailingSpaceChild->isText()) { + // Collapse away the trailing space at the end of a block. + RenderText* t = static_cast<RenderText*>(trailingSpaceChild); + const UChar space = ' '; + const Font& font = t->style()->font(); // FIXME: This ignores first-line. + int spaceWidth = font.width(TextRun(&space, 1)); + inlineMax -= spaceWidth + font.wordSpacing(); + if (inlineMin > inlineMax) + inlineMin = inlineMax; + } +} + +void RenderBlock::calcInlinePrefWidths() +{ + int inlineMax = 0; + int inlineMin = 0; + + int cw = containingBlock()->contentWidth(); + + // If we are at the start of a line, we want to ignore all white-space. + // Also strip spaces if we previously had text that ended in a trailing space. + bool stripFrontSpaces = true; + RenderObject* trailingSpaceChild = 0; + + // Firefox and Opera will allow a table cell to grow to fit an image inside it under + // very specific cirucumstances (in order to match common WinIE renderings). + // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.) + bool allowImagesToBreak = !style()->htmlHacks() || !isTableCell() || !style()->width().isIntrinsicOrAuto(); + + bool autoWrap, oldAutoWrap; + autoWrap = oldAutoWrap = style()->autoWrap(); + + InlineMinMaxIterator childIterator(this); + bool addedTextIndent = false; // Only gets added in once. + RenderObject* prevFloat = 0; + RenderObject* previousLeaf = 0; + while (RenderObject* child = childIterator.next()) { + autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() : + child->style()->autoWrap(); + + if (!child->isBR()) { + // Step One: determine whether or not we need to go ahead and + // terminate our current line. Each discrete chunk can become + // the new min-width, if it is the widest chunk seen so far, and + // it can also become the max-width. + + // Children fall into three categories: + // (1) An inline flow object. These objects always have a min/max of 0, + // and are included in the iteration solely so that their margins can + // be added in. + // + // (2) An inline non-text non-flow object, e.g., an inline replaced element. + // These objects can always be on a line by themselves, so in this situation + // we need to go ahead and break the current line, and then add in our own + // margins and min/max width on its own line, and then terminate the line. + // + // (3) A text object. Text runs can have breakable characters at the start, + // the middle or the end. They may also lose whitespace off the front if + // we're already ignoring whitespace. In order to compute accurate min-width + // information, we need three pieces of information. + // (a) the min-width of the first non-breakable run. Should be 0 if the text string + // starts with whitespace. + // (b) the min-width of the last non-breakable run. Should be 0 if the text string + // ends with whitespace. + // (c) the min/max width of the string (trimmed for whitespace). + // + // If the text string starts with whitespace, then we need to go ahead and + // terminate our current line (unless we're already in a whitespace stripping + // mode. + // + // If the text string has a breakable character in the middle, but didn't start + // with whitespace, then we add the width of the first non-breakable run and + // then end the current line. We then need to use the intermediate min/max width + // values (if any of them are larger than our current min/max). We then look at + // the width of the last non-breakable run and use that to start a new line + // (unless we end in whitespace). + RenderStyle* cstyle = child->style(); + int childMin = 0; + int childMax = 0; + + if (!child->isText()) { + // Case (1) and (2). Inline replaced and inline flow elements. + if (child->isInlineFlow()) { + // Add in padding/border/margin from the appropriate side of + // the element. + int bpm = getBorderPaddingMargin(child, childIterator.endOfInline); + childMin += bpm; + childMax += bpm; + + inlineMin += childMin; + inlineMax += childMax; + + child->setPrefWidthsDirty(false); + } else { + // Inline replaced elts add in their margins to their min/max values. + int margins = 0; + Length leftMargin = cstyle->marginLeft(); + Length rightMargin = cstyle->marginRight(); + if (leftMargin.isFixed()) + margins += leftMargin.value(); + if (rightMargin.isFixed()) + margins += rightMargin.value(); + childMin += margins; + childMax += margins; + } + } + + if (!child->isRenderInline() && !child->isText()) { + // Case (2). Inline replaced elements and floats. + // Go ahead and terminate the current line as far as + // minwidth is concerned. + childMin += child->minPrefWidth(); + childMax += child->maxPrefWidth(); + + bool clearPreviousFloat; + if (child->isFloating()) { + clearPreviousFloat = (prevFloat + && (prevFloat->style()->floating() == FLEFT && (child->style()->clear() & CLEFT) + || prevFloat->style()->floating() == FRIGHT && (child->style()->clear() & CRIGHT))); + prevFloat = child; + } else + clearPreviousFloat = false; + + bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak; + if (canBreakReplacedElement && (autoWrap || oldAutoWrap) || clearPreviousFloat) { + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + inlineMin = 0; + } + + // If we're supposed to clear the previous float, then terminate maxwidth as well. + if (clearPreviousFloat) { + m_maxPrefWidth = max(inlineMax, m_maxPrefWidth); + inlineMax = 0; + } + + // Add in text-indent. This is added in only once. + int ti = 0; + if (!addedTextIndent) { + addedTextIndent = true; + ti = style()->textIndent().calcMinValue(cw); + childMin+=ti; + childMax+=ti; + } + + // Add our width to the max. + inlineMax += childMax; + + if (!autoWrap || !canBreakReplacedElement) { + if (child->isFloating()) + m_minPrefWidth = max(childMin, m_minPrefWidth); + else + inlineMin += childMin; + } else { + // Now check our line. + m_minPrefWidth = max(childMin, m_minPrefWidth); + + // Now start a new line. + inlineMin = 0; + } + + // We are no longer stripping whitespace at the start of + // a line. + if (!child->isFloating()) { + stripFrontSpaces = false; + trailingSpaceChild = 0; + } + } else if (child->isText()) { + // Case (3). Text. + RenderText* t = static_cast<RenderText *>(child); + + if (t->isWordBreak()) { + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + inlineMin = 0; + continue; + } + + // Determine if we have a breakable character. Pass in + // whether or not we should ignore any spaces at the front + // of the string. If those are going to be stripped out, + // then they shouldn't be considered in the breakable char + // check. + bool hasBreakableChar, hasBreak; + int beginMin, endMin; + bool beginWS, endWS; + int beginMax, endMax; + t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS, + hasBreakableChar, hasBreak, beginMax, endMax, + childMin, childMax, stripFrontSpaces); + + // This text object will not be rendered, but it may still provide a breaking opportunity. + if (!hasBreak && childMax == 0) { + if (autoWrap && (beginWS || endWS)) { + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + inlineMin = 0; + } + continue; + } + + if (stripFrontSpaces) + trailingSpaceChild = child; + else + trailingSpaceChild = 0; + + // Add in text-indent. This is added in only once. + int ti = 0; + if (!addedTextIndent) { + addedTextIndent = true; + ti = style()->textIndent().calcMinValue(cw); + childMin+=ti; beginMin += ti; + childMax+=ti; beginMax += ti; + } + + // If we have no breakable characters at all, + // then this is the easy case. We add ourselves to the current + // min and max and continue. + if (!hasBreakableChar) { + inlineMin += childMin; + } else { + // We have a breakable character. Now we need to know if + // we start and end with whitespace. + if (beginWS) + // Go ahead and end the current line. + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + else { + inlineMin += beginMin; + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + childMin -= ti; + } + + inlineMin = childMin; + + if (endWS) { + // We end in whitespace, which means we can go ahead + // and end our current line. + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + inlineMin = 0; + } else { + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + inlineMin = endMin; + } + } + + if (hasBreak) { + inlineMax += beginMax; + m_maxPrefWidth = max(inlineMax, m_maxPrefWidth); + m_maxPrefWidth = max(childMax, m_maxPrefWidth); + inlineMax = endMax; + } else + inlineMax += childMax; + } + } else { + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + m_maxPrefWidth = max(inlineMax, m_maxPrefWidth); + inlineMin = inlineMax = 0; + stripFrontSpaces = true; + trailingSpaceChild = 0; + } + + oldAutoWrap = autoWrap; + if (!child->isInlineFlow()) + previousLeaf = child; + } + + if (style()->collapseWhiteSpace()) + stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild); + + m_minPrefWidth = max(inlineMin, m_minPrefWidth); + m_maxPrefWidth = max(inlineMax, m_maxPrefWidth); +} + +// Use a very large value (in effect infinite). +#define BLOCK_MAX_WIDTH 15000 + +void RenderBlock::calcBlockPrefWidths() +{ + bool nowrap = style()->whiteSpace() == NOWRAP; + + RenderObject *child = firstChild(); + int floatLeftWidth = 0, floatRightWidth = 0; + while (child) { + // Positioned children don't affect the min/max width + if (child->isPositioned()) { + child = child->nextSibling(); + continue; + } + + if (child->isFloating() || child->avoidsFloats()) { + int floatTotalWidth = floatLeftWidth + floatRightWidth; + if (child->style()->clear() & CLEFT) { + m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth); + floatLeftWidth = 0; + } + if (child->style()->clear() & CRIGHT) { + m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth); + floatRightWidth = 0; + } + } + + // A margin basically has three types: fixed, percentage, and auto (variable). + // Auto and percentage margins simply become 0 when computing min/max width. + // Fixed margins can be added in as is. + Length ml = child->style()->marginLeft(); + Length mr = child->style()->marginRight(); + int margin = 0, marginLeft = 0, marginRight = 0; + if (ml.isFixed()) + marginLeft += ml.value(); + if (mr.isFixed()) + marginRight += mr.value(); + margin = marginLeft + marginRight; + + int w = child->minPrefWidth() + margin; + m_minPrefWidth = max(w, m_minPrefWidth); + + // IE ignores tables for calculation of nowrap. Makes some sense. + if (nowrap && !child->isTable()) + m_maxPrefWidth = max(w, m_maxPrefWidth); + + w = child->maxPrefWidth() + margin; + + if (!child->isFloating()) { + if (child->avoidsFloats()) { + // Determine a left and right max value based off whether or not the floats can fit in the + // margins of the object. For negative margins, we will attempt to overlap the float if the negative margin + // is smaller than the float width. + int maxLeft = marginLeft > 0 ? max(floatLeftWidth, marginLeft) : floatLeftWidth + marginLeft; + int maxRight = marginRight > 0 ? max(floatRightWidth, marginRight) : floatRightWidth + marginRight; + w = child->maxPrefWidth() + maxLeft + maxRight; + w = max(w, floatLeftWidth + floatRightWidth); + } + else + m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth); + floatLeftWidth = floatRightWidth = 0; + } + + if (child->isFloating()) { + if (style()->floating() == FLEFT) + floatLeftWidth += w; + else + floatRightWidth += w; + } else + m_maxPrefWidth = max(w, m_maxPrefWidth); + + // A very specific WinIE quirk. + // Example: + /* + <div style="position:absolute; width:100px; top:50px;"> + <div style="position:absolute;left:0px;top:50px;height:50px;background-color:green"> + <table style="width:100%"><tr><td></table> + </div> + </div> + */ + // In the above example, the inner absolute positioned block should have a computed width + // of 100px because of the table. + // We can achieve this effect by making the maxwidth of blocks that contain tables + // with percentage widths be infinite (as long as they are not inside a table cell). + if (style()->htmlHacks() && child->style()->width().isPercent() && + !isTableCell() && child->isTable() && m_maxPrefWidth < BLOCK_MAX_WIDTH) { + RenderBlock* cb = containingBlock(); + while (!cb->isRenderView() && !cb->isTableCell()) + cb = cb->containingBlock(); + if (!cb->isTableCell()) + m_maxPrefWidth = BLOCK_MAX_WIDTH; + } + + child = child->nextSibling(); + } + + // Always make sure these values are non-negative. + m_minPrefWidth = max(0, m_minPrefWidth); + m_maxPrefWidth = max(0, m_maxPrefWidth); + + m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth); +} + +bool RenderBlock::hasLineIfEmpty() const +{ + return element() && (element()->isContentEditable() && element()->rootEditableElement() == element() || + element()->isShadowNode() && element()->shadowParentNode()->hasTagName(inputTag)); +} + +int RenderBlock::lineHeight(bool b, bool isRootLineBox) const +{ + // Inline blocks are replaced elements. Otherwise, just pass off to + // the base class. If we're being queried as though we're the root line + // box, then the fact that we're an inline-block is irrelevant, and we behave + // just like a block. + if (isReplaced() && !isRootLineBox) + return height() + marginTop() + marginBottom(); + return RenderFlow::lineHeight(b, isRootLineBox); +} + +int RenderBlock::baselinePosition(bool b, bool isRootLineBox) const +{ + // Inline blocks are replaced elements. Otherwise, just pass off to + // the base class. If we're being queried as though we're the root line + // box, then the fact that we're an inline-block is irrelevant, and we behave + // just like a block. + if (isReplaced() && !isRootLineBox) { + // For "leaf" theme objects, let the theme decide what the baseline position is. + // FIXME: Might be better to have a custom CSS property instead, so that if the theme + // is turned off, checkboxes/radios will still have decent baselines. + if (style()->hasAppearance() && !theme()->isControlContainer(style()->appearance())) + return theme()->baselinePosition(this); + + // CSS2.1 states that the baseline of an inline block is the baseline of the last line box in + // the normal flow. We make an exception for marquees, since their baselines are meaningless + // (the content inside them moves). This matches WinIE as well, which just bottom-aligns them. + // We also give up on finding a baseline if we have a vertical scrollbar, or if we are scrolled + // vertically (e.g., an overflow:hidden block that has had scrollTop moved) or if the baseline is outside + // of our content box. + int baselinePos = (m_layer && (m_layer->marquee() || m_layer->verticalScrollbar() || m_layer->scrollYOffset() != 0)) ? -1 : getBaselineOfLastLineBox(); + if (baselinePos != -1 && baselinePos <= borderTop() + paddingTop() + contentHeight()) + return marginTop() + baselinePos; + return height() + marginTop() + marginBottom(); + } + return RenderFlow::baselinePosition(b, isRootLineBox); +} + +int RenderBlock::getBaselineOfFirstLineBox() const +{ + if (!isBlockFlow()) + return RenderFlow::getBaselineOfFirstLineBox(); + + if (childrenInline()) { + if (firstLineBox()) + return firstLineBox()->yPos() + firstLineBox()->baseline(); + else + return -1; + } + else { + for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) { + if (!curr->isFloatingOrPositioned()) { + int result = curr->getBaselineOfFirstLineBox(); + if (result != -1) + return curr->yPos() + result; // Translate to our coordinate space. + } + } + } + + return -1; +} + +int RenderBlock::getBaselineOfLastLineBox() const +{ + if (!isBlockFlow()) + return RenderFlow::getBaselineOfLastLineBox(); + + if (childrenInline()) { + if (!firstLineBox() && hasLineIfEmpty()) + return RenderFlow::baselinePosition(true, true) + borderTop() + paddingTop(); + if (lastLineBox()) + return lastLineBox()->yPos() + lastLineBox()->baseline(); + return -1; + } + else { + bool haveNormalFlowChild = false; + for (RenderObject* curr = lastChild(); curr; curr = curr->previousSibling()) { + if (!curr->isFloatingOrPositioned()) { + haveNormalFlowChild = true; + int result = curr->getBaselineOfLastLineBox(); + if (result != -1) + return curr->yPos() + result; // Translate to our coordinate space. + } + } + if (!haveNormalFlowChild && hasLineIfEmpty()) + return RenderFlow::baselinePosition(true, true) + borderTop() + paddingTop(); + } + + return -1; +} + +bool RenderBlock::containsNonZeroBidiLevel() const +{ + for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) { + for (InlineBox* box = root->firstLeafChild(); box; box = box->nextLeafChild()) { + if (box->bidiLevel()) + return true; + } + } + return false; +} + +RenderBlock* RenderBlock::firstLineBlock() const +{ + const RenderObject* firstLineBlock = this; + bool hasPseudo = false; + while (true) { + hasPseudo = firstLineBlock->style()->hasPseudoStyle(RenderStyle::FIRST_LINE); + if (hasPseudo) + break; + RenderObject* parentBlock = firstLineBlock->parent(); + if (firstLineBlock->isReplaced() || firstLineBlock->isFloating() || + !parentBlock || parentBlock->firstChild() != firstLineBlock || !parentBlock->isBlockFlow()) + break; + firstLineBlock = parentBlock; + } + + if (!hasPseudo) + return 0; + + return (RenderBlock*)(firstLineBlock); +} + +void RenderBlock::updateFirstLetter() +{ + if (!document()->usesFirstLetterRules()) + return; + // Don't recurse + if (style()->styleType() == RenderStyle::FIRST_LETTER) + return; + + // FIXME: We need to destroy the first-letter object if it is no longer the first child. Need to find + // an efficient way to check for that situation though before implementing anything. + RenderObject* firstLetterBlock = this; + bool hasPseudoStyle = false; + while (true) { + // We only honor first-letter if the firstLetterBlock can have children in the DOM. This correctly + // prevents form controls from honoring first-letter. + hasPseudoStyle = firstLetterBlock->style()->hasPseudoStyle(RenderStyle::FIRST_LETTER) + && firstLetterBlock->canHaveChildren(); + if (hasPseudoStyle) + break; + RenderObject* parentBlock = firstLetterBlock->parent(); + if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock || + !parentBlock->isBlockFlow()) + break; + firstLetterBlock = parentBlock; + } + + if (!hasPseudoStyle) + return; + + // Drill into inlines looking for our first text child. + RenderObject* currChild = firstLetterBlock->firstChild(); + while (currChild && currChild->needsLayout() && (!currChild->isReplaced() || currChild->isFloatingOrPositioned()) && !currChild->isText()) { + if (currChild->isFloatingOrPositioned()) { + if (currChild->style()->styleType() == RenderStyle::FIRST_LETTER) + break; + currChild = currChild->nextSibling(); + } else + currChild = currChild->firstChild(); + } + + // Get list markers out of the way. + while (currChild && currChild->isListMarker()) + currChild = currChild->nextSibling(); + + if (!currChild) + return; + + RenderObject* firstLetterContainer = currChild->parent(); + + // If the child already has style, then it has already been created, so we just want + // to update it. + if (currChild->style()->styleType() == RenderStyle::FIRST_LETTER) { + RenderStyle* pseudo = firstLetterBlock->getCachedPseudoStyle(RenderStyle::FIRST_LETTER, + firstLetterContainer->firstLineStyle()); + currChild->setStyle(pseudo); + for (RenderObject* genChild = currChild->firstChild(); genChild; genChild = genChild->nextSibling()) { + if (genChild->isText()) + genChild->setStyle(pseudo); + } + return; + } + + // If the child does not already have style, we create it here. + if (currChild->isText() && !currChild->isBR() && currChild->parent()->style()->styleType() != RenderStyle::FIRST_LETTER) { + // Our layout state is not valid for the repaints we are going to trigger by + // adding and removing children of firstLetterContainer. + view()->disableLayoutState(); + + RenderText* textObj = static_cast<RenderText*>(currChild); + + // Create our pseudo style now that we have our firstLetterContainer determined. + RenderStyle* pseudoStyle = firstLetterBlock->getCachedPseudoStyle(RenderStyle::FIRST_LETTER, + firstLetterContainer->firstLineStyle()); + + // Force inline display (except for floating first-letters) + pseudoStyle->setDisplay( pseudoStyle->isFloating() ? BLOCK : INLINE); + pseudoStyle->setPosition( StaticPosition ); // CSS2 says first-letter can't be positioned. + + RenderObject* firstLetter = RenderFlow::createAnonymousFlow(document(), pseudoStyle); // anonymous box + firstLetterContainer->addChild(firstLetter, currChild); + + // The original string is going to be either a generated content string or a DOM node's + // string. We want the original string before it got transformed in case first-letter has + // no text-transform or a different text-transform applied to it. + RefPtr<StringImpl> oldText = textObj->originalText(); + ASSERT(oldText); + + if (oldText && oldText->length() > 0) { + unsigned int length = 0; + + // account for leading spaces and punctuation + while (length < oldText->length() && (isSpaceOrNewline((*oldText)[length]) || Unicode::isPunct((*oldText)[length]))) + length++; + + // account for first letter + length++; + + // construct text fragment for the text after the first letter + // NOTE: this might empty + RenderTextFragment* remainingText = + new (renderArena()) RenderTextFragment(textObj->node(), oldText.get(), length, oldText->length() - length); + remainingText->setStyle(textObj->style()); + if (remainingText->element()) + remainingText->element()->setRenderer(remainingText); + + RenderObject* nextObj = textObj->nextSibling(); + firstLetterContainer->removeChild(textObj); + firstLetterContainer->addChild(remainingText, nextObj); + remainingText->setFirstLetter(firstLetter); + + // construct text fragment for the first letter + RenderTextFragment* letter = + new (renderArena()) RenderTextFragment(remainingText->node(), oldText.get(), 0, length); + RefPtr<RenderStyle> newStyle = RenderStyle::create(); + newStyle->inheritFrom(pseudoStyle); + letter->setStyle(newStyle.release()); + firstLetter->addChild(letter); + + textObj->destroy(); + } + view()->enableLayoutState(); + } +} + +bool RenderBlock::inRootBlockContext() const +{ + if (isTableCell() || isFloatingOrPositioned() || hasOverflowClip()) + return false; + + if (isRoot() || isRenderView()) + return true; + + return containingBlock()->inRootBlockContext(); +} + +// Helper methods for obtaining the last line, computing line counts and heights for line counts +// (crawling into blocks). +static bool shouldCheckLines(RenderObject* obj) +{ + return !obj->isFloatingOrPositioned() && !obj->isCompact() && !obj->isRunIn() && + obj->isBlockFlow() && obj->style()->height().isAuto() && + (!obj->isFlexibleBox() || obj->style()->boxOrient() == VERTICAL); +} + +static RootInlineBox* getLineAtIndex(RenderBlock* block, int i, int& count) +{ + if (block->style()->visibility() == VISIBLE) { + if (block->childrenInline()) { + for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) { + if (count++ == i) + return box; + } + } + else { + for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) { + if (shouldCheckLines(obj)) { + RootInlineBox *box = getLineAtIndex(static_cast<RenderBlock*>(obj), i, count); + if (box) + return box; + } + } + } + } + return 0; +} + +int getHeightForLineCount(RenderBlock* block, int l, bool includeBottom, int& count) +{ + if (block->style()->visibility() == VISIBLE) { + if (block->childrenInline()) { + for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) { + if (++count == l) + return box->bottomOverflow() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0); + } + } + else { + RenderObject* normalFlowChildWithoutLines = 0; + for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) { + if (shouldCheckLines(obj)) { + int result = getHeightForLineCount(static_cast<RenderBlock*>(obj), l, false, count); + if (result != -1) + return result + obj->yPos() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0); + } + else if (!obj->isFloatingOrPositioned() && !obj->isCompact() && !obj->isRunIn()) + normalFlowChildWithoutLines = obj; + } + if (normalFlowChildWithoutLines && l == 0) + return normalFlowChildWithoutLines->yPos() + normalFlowChildWithoutLines->height(); + } + } + + return -1; +} + +RootInlineBox* RenderBlock::lineAtIndex(int i) +{ + int count = 0; + return getLineAtIndex(this, i, count); +} + +int RenderBlock::lineCount() +{ + int count = 0; + if (style()->visibility() == VISIBLE) { + if (childrenInline()) + for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) + count++; + else + for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling()) + if (shouldCheckLines(obj)) + count += static_cast<RenderBlock*>(obj)->lineCount(); + } + return count; +} + +int RenderBlock::heightForLineCount(int l) +{ + int count = 0; + return getHeightForLineCount(this, l, true, count); +} + +void RenderBlock::adjustForBorderFit(int x, int& left, int& right) const +{ + // We don't deal with relative positioning. Our assumption is that you shrink to fit the lines without accounting + // for either overflow or translations via relative positioning. + if (style()->visibility() == VISIBLE) { + if (childrenInline()) { + for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) { + if (box->firstChild()) + left = min(left, x + box->firstChild()->xPos()); + if (box->lastChild()) + right = max(right, x + box->lastChild()->xPos() + box->lastChild()->width()); + } + } + else { + for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling()) { + if (!obj->isFloatingOrPositioned()) { + if (obj->isBlockFlow() && !obj->hasOverflowClip()) + static_cast<RenderBlock*>(obj)->adjustForBorderFit(x + obj->xPos(), left, right); + else if (obj->style()->visibility() == VISIBLE) { + // We are a replaced element or some kind of non-block-flow object. + left = min(left, x + obj->xPos()); + right = max(right, x + obj->xPos() + obj->width()); + } + } + } + } + + if (m_floatingObjects) { + FloatingObject* r; + DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); + for (; (r = it.current()); ++it) { + // Only examine the object if our m_shouldPaint flag is set. + if (r->m_shouldPaint) { + int floatLeft = r->m_left - r->m_renderer->xPos() + r->m_renderer->marginLeft(); + int floatRight = floatLeft + r->m_renderer->width(); + left = min(left, floatLeft); + right = max(right, floatRight); + } + } + } + } +} + +void RenderBlock::borderFitAdjust(int& x, int& w) const +{ + if (style()->borderFit() == BorderFitBorder) + return; + + // Walk any normal flow lines to snugly fit. + int left = INT_MAX; + int right = INT_MIN; + int oldWidth = w; + adjustForBorderFit(0, left, right); + if (left != INT_MAX) { + left -= (borderLeft() + paddingLeft()); + if (left > 0) { + x += left; + w -= left; + } + } + if (right != INT_MIN) { + right += (borderRight() + paddingRight()); + if (right < oldWidth) + w -= (oldWidth - right); + } +} + +void RenderBlock::clearTruncation() +{ + if (style()->visibility() == VISIBLE) { + if (childrenInline() && hasMarkupTruncation()) { + setHasMarkupTruncation(false); + for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) + box->clearTruncation(); + } + else + for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling()) + if (shouldCheckLines(obj)) + static_cast<RenderBlock*>(obj)->clearTruncation(); + } +} + +void RenderBlock::setMaxTopMargins(int pos, int neg) +{ + if (!m_maxMargin) { + if (pos == MaxMargin::topPosDefault(this) && neg == MaxMargin::topNegDefault(this)) + return; + m_maxMargin = new MaxMargin(this); + } + m_maxMargin->m_topPos = pos; + m_maxMargin->m_topNeg = neg; +} + +void RenderBlock::setMaxBottomMargins(int pos, int neg) +{ + if (!m_maxMargin) { + if (pos == MaxMargin::bottomPosDefault(this) && neg == MaxMargin::bottomNegDefault(this)) + return; + m_maxMargin = new MaxMargin(this); + } + m_maxMargin->m_bottomPos = pos; + m_maxMargin->m_bottomNeg = neg; +} + +const char* RenderBlock::renderName() const +{ + if (isBody()) + return "RenderBody"; // FIXME: Temporary hack until we know that the regression tests pass. + + if (isFloating()) + return "RenderBlock (floating)"; + if (isPositioned()) + return "RenderBlock (positioned)"; + if (isAnonymousBlock()) + return "RenderBlock (anonymous)"; + else if (isAnonymous()) + return "RenderBlock (generated)"; + if (isRelPositioned()) + return "RenderBlock (relative positioned)"; + if (isCompact()) + return "RenderBlock (compact)"; + if (isRunIn()) + return "RenderBlock (run-in)"; + return "RenderBlock"; +} + +} // namespace WebCore |