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+/*
+ * This file is part of the render object implementation for KHTML.
+ *
+ * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ * (C) 1999-2003 Antti Koivisto (koivisto@kde.org)
+ * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
+ * (C) 2003 Apple Computer, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef RENDER_BLOCK_H
+#define RENDER_BLOCK_H
+
+#include <qptrlist.h>
+
+#include "render_flow.h"
+
+namespace khtml {
+
+class RenderBlock : public RenderFlow
+{
+public:
+ RenderBlock(DOM::NodeImpl* node);
+ virtual ~RenderBlock();
+
+ virtual const char *renderName() const;
+
+ virtual bool isRenderBlock() const { return true; }
+ virtual bool isBlockFlow() const { return !isInline() && !isTable(); }
+ virtual bool isInlineFlow() const { return isInline() && !isReplaced(); }
+ virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); }
+
+ virtual bool childrenInline() const { return m_childrenInline; }
+ virtual void setChildrenInline(bool b) { m_childrenInline = b; }
+ void makeChildrenNonInline(RenderObject* insertionPoint = 0);
+
+ void makePageBreakAvoidBlocks();
+
+ // The height (and width) of a block when you include overflow spillage out of the bottom
+ // of the block (e.g., a <div style="height:25px"> that has a 100px tall image inside
+ // it would have an overflow height of borderTop() + paddingTop() + 100px.
+ virtual int overflowHeight() const { return m_overflowHeight; }
+ virtual int overflowWidth() const { return m_overflowWidth; }
+ virtual int overflowLeft() const { return m_overflowLeft; }
+ virtual int overflowTop() const { return m_overflowTop; }
+ virtual void setOverflowHeight(int h) { m_overflowHeight = h; }
+ virtual void setOverflowWidth(int w) { m_overflowWidth = w; }
+ virtual void setOverflowLeft(int l) { m_overflowLeft = l; }
+ virtual void setOverflowTop(int t) { m_overflowTop = t; }
+
+ virtual bool isSelfCollapsingBlock() const;
+ virtual bool isTopMarginQuirk() const { return m_topMarginQuirk; }
+ virtual bool isBottomMarginQuirk() const { return m_bottomMarginQuirk; }
+
+ virtual short maxTopMargin(bool positive) const {
+ if (positive)
+ return m_maxTopPosMargin;
+ else
+ return m_maxTopNegMargin;
+ }
+ virtual short maxBottomMargin(bool positive) const {
+ if (positive)
+ return m_maxBottomPosMargin;
+ else
+ return m_maxBottomNegMargin;
+ }
+
+ void initMaxMarginValues() {
+ if (m_marginTop >= 0)
+ m_maxTopPosMargin = m_marginTop;
+ else
+ m_maxTopNegMargin = -m_marginTop;
+ if (m_marginBottom >= 0)
+ m_maxBottomPosMargin = m_marginBottom;
+ else
+ m_maxBottomNegMargin = -m_marginBottom;
+ }
+
+ virtual void addChildToFlow(RenderObject* newChild, RenderObject* beforeChild);
+ virtual void removeChild(RenderObject *oldChild);
+
+ virtual void setStyle(RenderStyle* _style);
+ virtual void attach();
+ void updateFirstLetter();
+
+ virtual void layout();
+ void layoutBlock( bool relayoutChildren );
+ void layoutBlockChildren( bool relayoutChildren );
+ void layoutInlineChildren( bool relayoutChildren, int breakBeforeLine = 0);
+
+ void layoutPositionedObjects( bool relayoutChildren );
+ void insertPositionedObject(RenderObject *o);
+ void removePositionedObject(RenderObject *o);
+
+ // Called to lay out the legend for a fieldset.
+ virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; };
+
+ // the implementation of the following functions is in bidi.cpp
+ void bidiReorderLine(const BidiIterator &start, const BidiIterator &end, BidiState &bidi );
+ BidiIterator findNextLineBreak(BidiIterator &start, BidiState &info );
+ InlineFlowBox* constructLine(const BidiIterator& start, const BidiIterator& end);
+ InlineFlowBox* createLineBoxes(RenderObject* obj);
+ void computeHorizontalPositionsForLine(InlineFlowBox* lineBox, BidiState &bidi);
+ void computeVerticalPositionsForLine(InlineFlowBox* lineBox);
+ bool clearLineOfPageBreaks(InlineFlowBox* lineBox);
+ void checkLinesForOverflow();
+ void deleteEllipsisLineBoxes();
+ void checkLinesForTextOverflow();
+ // end bidi.cpp functions
+
+ virtual void paint(PaintInfo& i, int tx, int ty);
+ void paintObject(PaintInfo& i, int tx, int ty, bool paintOutline = true);
+ void paintFloats(PaintInfo& i, int _tx, int _ty, bool paintSelection = false);
+
+ void insertFloatingObject(RenderObject *o);
+ void removeFloatingObject(RenderObject *o);
+
+ // called from lineWidth, to position the floats added in the last line.
+ void positionNewFloats();
+ void clearFloats();
+ int getClearDelta(RenderObject *child);
+ virtual void markAllDescendantsWithFloatsForLayout(RenderObject* floatToRemove = 0);
+
+ // FIXME: containsFloats() should not return true if the floating objects list
+ // is empty. However, layoutInlineChildren() relies on the current behavior.
+ // http://bugzilla.opendarwin.org/show_bug.cgi?id=7395#c3
+ virtual bool hasFloats() const { return m_floatingObjects!=0; }
+ virtual bool containsFloat(RenderObject* o) const;
+
+ virtual bool hasOverhangingFloats() const { return floatBottom() > m_height; }
+ void addOverHangingFloats( RenderBlock *block, int xoffset, int yoffset, bool child );
+
+ int nearestFloatBottom(int height) const;
+ int floatBottom() const;
+ inline int leftBottom();
+ inline int rightBottom();
+
+ virtual unsigned short lineWidth(int y, bool *canClearLine = 0) const;
+ virtual int lowestPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
+ virtual int rightmostPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
+ virtual int leftmostPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
+ virtual int highestPosition(bool includeOverflowInterior, bool includeSelf) const;
+ int lowestAbsolutePosition() const;
+ int leftmostAbsolutePosition() const;
+ int rightmostAbsolutePosition() const;
+ int highestAbsolutePosition() const;
+
+ int rightOffset() const;
+ int rightRelOffset(int y, int fixedOffset, bool applyTextIndent=true, int *heightRemaining = 0, bool *canClearLine = 0) const;
+ int rightOffset(int y, bool *canClearLine = 0) const { return rightRelOffset(y, rightOffset(), true, 0, canClearLine); }
+
+ int leftOffset() const;
+ int leftRelOffset(int y, int fixedOffset, bool applyTextIndent=true, int *heightRemaining = 0, bool *canClearLine = 0) const;
+ int leftOffset(int y, bool *canClearLine = 0) const { return leftRelOffset(y, leftOffset(), true, 0, canClearLine); }
+
+ virtual bool nodeAtPoint(NodeInfo& info, int x, int y, int _tx, int _ty, HitTestAction hitTestAction = HitTestAll, bool inside=false);
+
+ bool isPointInScrollbar(int x, int y, int tx, int ty);
+
+ virtual void calcMinMaxWidth();
+ void calcInlineMinMaxWidth();
+ void calcBlockMinMaxWidth();
+
+ virtual void close();
+
+ virtual int getBaselineOfFirstLineBox();
+ virtual InlineFlowBox* getFirstLineBox();
+
+ RootInlineBox* firstRootBox() { return static_cast<RootInlineBox*>(m_firstLineBox); }
+ RootInlineBox* lastRootBox() { return static_cast<RootInlineBox*>(m_lastLineBox); }
+
+ bool inRootBlockContext() const;
+
+#ifdef ENABLE_DUMP
+ virtual void printTree(int indent=0) const;
+ virtual void dump(QTextStream &stream, const QString &ind) const;
+#endif
+
+protected:
+ void newLine();
+
+protected:
+ struct FloatingObject {
+ enum Type {
+ FloatLeft,
+ FloatRight
+ };
+
+ FloatingObject(Type _type) {
+ node = 0;
+ startY = 0;
+ endY = 0;
+ type = _type;
+ left = 0;
+ width = 0;
+ noPaint = false;
+ crossedLayer = false;
+
+ }
+ RenderObject* node;
+ int startY;
+ int endY;
+ short left;
+ short width;
+ Type type : 1; // left or right aligned
+ bool noPaint : 1;
+ bool crossedLayer : 1; // lock noPaint flag
+ };
+
+ // The following helper functions and structs are used by layoutBlockChildren.
+ class CompactInfo {
+ // A compact child that needs to be collapsed into the margin of the following block.
+ RenderObject* m_compact;
+
+ // The block with the open margin that the compact child is going to place itself within.
+ RenderObject* m_block;
+ bool m_treatAsBlock : 1;
+
+ public:
+ RenderObject* compact() const { return m_compact; }
+ RenderObject* block() const { return m_block; }
+ void setTreatAsBlock(bool b) { m_treatAsBlock = b; }
+ bool treatAsBlock() const { return m_treatAsBlock; }
+ bool matches(RenderObject* child) const { return m_compact && m_block == child; }
+
+ void clear() { set(0, 0); }
+ void set(RenderObject* c, RenderObject* b) { m_compact = c; m_block = b; }
+
+ CompactInfo() { clear(); }
+ };
+
+ class MarginInfo {
+ // Collapsing flags for whether we can collapse our margins with our children's margins.
+ bool m_canCollapseWithChildren : 1;
+ bool m_canCollapseTopWithChildren : 1;
+ bool m_canCollapseBottomWithChildren : 1;
+
+ // Whether or not we are a quirky container, i.e., do we collapse away top and bottom
+ // margins in our container. Table cells and the body are the common examples. We
+ // also have a custom style property for Safari RSS to deal with TypePad blog articles.
+ bool m_quirkContainer : 1;
+
+ // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block.
+ // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will
+ // always be collapsing with one another. This variable can remain set to true through multiple iterations
+ // as long as we keep encountering self-collapsing blocks.
+ bool m_atTopOfBlock : 1;
+
+ // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block.
+ bool m_atBottomOfBlock : 1;
+
+ // If our last normal flow child was a self-collapsing block that cleared a float,
+ // we track it in this variable.
+ bool m_selfCollapsingBlockClearedFloat : 1;
+
+ // These variables are used to detect quirky margins that we need to collapse away (in table cells
+ // and in the body element).
+ bool m_topQuirk : 1;
+ bool m_bottomQuirk : 1;
+ bool m_determinedTopQuirk : 1;
+
+ // These flags track the previous maximal positive and negative margins.
+ int m_posMargin;
+ int m_negMargin;
+
+ public:
+ MarginInfo(RenderBlock* b, int top, int bottom);
+
+ void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; }
+ void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; }
+ void clearMargin() { m_posMargin = m_negMargin = 0; }
+ void setSelfCollapsingBlockClearedFloat(bool b) { m_selfCollapsingBlockClearedFloat = b; }
+ void setTopQuirk(bool b) { m_topQuirk = b; }
+ void setBottomQuirk(bool b) { m_bottomQuirk = b; }
+ void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; }
+ void setPosMargin(int p) { m_posMargin = p; }
+ void setNegMargin(int n) { m_negMargin = n; }
+ void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; }
+ void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; }
+
+ void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; }
+
+ bool atTopOfBlock() const { return m_atTopOfBlock; }
+ bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; }
+ bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; }
+ bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; }
+ bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; }
+ bool selfCollapsingBlockClearedFloat() const { return m_selfCollapsingBlockClearedFloat; }
+ bool quirkContainer() const { return m_quirkContainer; }
+ bool determinedTopQuirk() const { return m_determinedTopQuirk; }
+ bool topQuirk() const { return m_topQuirk; }
+ bool bottomQuirk() const { return m_bottomQuirk; }
+ int posMargin() const { return m_posMargin; }
+ int negMargin() const { return m_negMargin; }
+ int margin() const { return m_posMargin - m_negMargin; }
+ };
+
+ class PageBreakInfo {
+ int m_pageBottom; // Next calculated page-break
+ bool m_forcePageBreak : 1; // Must break before next block
+ // ### to do better "page-break-after/before: avoid" this struct
+ // should keep a pagebreakAvoid block and gather children in it
+ public:
+ PageBreakInfo(int pageBottom) : m_pageBottom(pageBottom), m_forcePageBreak(false) {};
+ bool forcePageBreak() { return m_forcePageBreak; }
+ void setForcePageBreak(bool b) { m_forcePageBreak = b; }
+ int pageBottom() { return m_pageBottom; };
+ void setPageBottom(int bottom) { m_pageBottom = bottom; }
+ };
+
+ virtual bool canClear(RenderObject *child, PageBreakLevel level);
+ void clearPageBreak(RenderObject* child, int pageBottom);
+
+ void adjustPositionedBlock(RenderObject* child, const MarginInfo& marginInfo);
+ void adjustFloatingBlock(const MarginInfo& marginInfo);
+ RenderObject* handleSpecialChild(RenderObject* child, const MarginInfo& marginInfo, CompactInfo& compactInfo, bool& handled);
+ RenderObject* handleFloatingChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled);
+ RenderObject* handlePositionedChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled);
+ RenderObject* handleCompactChild(RenderObject* child, CompactInfo& compactInfo, const MarginInfo& marginInfo, bool& handled);
+ RenderObject* handleRunInChild(RenderObject* child, bool& handled);
+ void collapseMargins(RenderObject* child, MarginInfo& marginInfo, int yPosEstimate);
+ void clearFloatsIfNeeded(RenderObject* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin);
+ void adjustSizeForCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo);
+ void insertCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo);
+ int estimateVerticalPosition(RenderObject* child, const MarginInfo& info);
+ void determineHorizontalPosition(RenderObject* child);
+ void handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo);
+ void setCollapsedBottomMargin(const MarginInfo& marginInfo);
+ void clearChildOfPageBreaks(RenderObject* child, PageBreakInfo &pageBreakInfo, MarginInfo &marginInfo);
+ // End helper functions and structs used by layoutBlockChildren.
+
+protected:
+ // How much content overflows out of our block vertically or horizontally (all we support
+ // for now is spillage out of the bottom and the right, which are the common cases).
+ int m_overflowHeight;
+ int m_overflowWidth;
+
+ // Left and top overflow.
+ int m_overflowTop;
+ int m_overflowLeft;
+
+private:
+ QPtrList<FloatingObject>* m_floatingObjects;
+ QPtrList<RenderObject>* m_positionedObjects;
+
+ bool m_childrenInline : 1;
+ bool m_firstLine : 1; // used in inline layouting
+ EClear m_clearStatus : 2; // used during layuting of paragraphs
+ bool m_avoidPageBreak : 1; // anonymous avoid page-break block
+ bool m_topMarginQuirk : 1;
+ bool m_bottomMarginQuirk : 1;
+
+ short m_maxTopPosMargin;
+ short m_maxTopNegMargin;
+ short m_maxBottomPosMargin;
+ short m_maxBottomNegMargin;
+
+};
+
+} // namespace
+
+#endif // RENDER_BLOCK_H
+