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379 lines
16 KiB
379 lines
16 KiB
/*
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* This file is part of the render object implementation for TDEHTML.
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*
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* Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
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* (C) 1999-2003 Antti Koivisto (koivisto@kde.org)
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* (C) 2002-2003 Dirk Mueller (mueller@kde.org)
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* (C) 2003 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef RENDER_BLOCK_H
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#define RENDER_BLOCK_H
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#include <tqptrlist.h>
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#include "render_flow.h"
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namespace tdehtml {
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class RenderBlock : public RenderFlow
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{
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public:
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RenderBlock(DOM::NodeImpl* node);
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virtual ~RenderBlock();
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virtual const char *renderName() const;
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virtual bool isRenderBlock() const { return true; }
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virtual bool isBlockFlow() const { return !isInline() && !isTable(); }
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virtual bool isInlineFlow() const { return isInline() && !isReplaced(); }
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virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); }
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virtual bool childrenInline() const { return m_childrenInline; }
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virtual void setChildrenInline(bool b) { m_childrenInline = b; }
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void makeChildrenNonInline(RenderObject* insertionPoint = 0);
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void makePageBreakAvoidBlocks();
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// The height (and width) of a block when you include overflow spillage out of the bottom
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// of the block (e.g., a <div style="height:25px"> that has a 100px tall image inside
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// it would have an overflow height of borderTop() + paddingTop() + 100px.
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virtual int overflowHeight() const { return m_overflowHeight; }
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virtual int overflowWidth() const { return m_overflowWidth; }
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virtual int overflowLeft() const { return m_overflowLeft; }
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virtual int overflowTop() const { return m_overflowTop; }
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virtual void setOverflowHeight(int h) { m_overflowHeight = h; }
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virtual void setOverflowWidth(int w) { m_overflowWidth = w; }
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virtual void setOverflowLeft(int l) { m_overflowLeft = l; }
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virtual void setOverflowTop(int t) { m_overflowTop = t; }
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virtual bool isSelfCollapsingBlock() const;
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virtual bool isTopMarginQuirk() const { return m_topMarginQuirk; }
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virtual bool isBottomMarginQuirk() const { return m_bottomMarginQuirk; }
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virtual short maxTopMargin(bool positive) const {
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if (positive)
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return m_maxTopPosMargin;
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else
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return m_maxTopNegMargin;
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}
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virtual short maxBottomMargin(bool positive) const {
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if (positive)
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return m_maxBottomPosMargin;
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else
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return m_maxBottomNegMargin;
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}
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void initMaxMarginValues() {
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if (m_marginTop >= 0)
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m_maxTopPosMargin = m_marginTop;
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else
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m_maxTopNegMargin = -m_marginTop;
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if (m_marginBottom >= 0)
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m_maxBottomPosMargin = m_marginBottom;
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else
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m_maxBottomNegMargin = -m_marginBottom;
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}
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virtual void addChildToFlow(RenderObject* newChild, RenderObject* beforeChild);
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virtual void removeChild(RenderObject *oldChild);
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virtual void setStyle(RenderStyle* _style);
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virtual void attach();
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void updateFirstLetter();
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virtual void layout();
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void layoutBlock( bool relayoutChildren );
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void layoutBlockChildren( bool relayoutChildren );
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void layoutInlineChildren( bool relayoutChildren, int breakBeforeLine = 0);
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void layoutPositionedObjects( bool relayoutChildren );
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void insertPositionedObject(RenderObject *o);
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void removePositionedObject(RenderObject *o);
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// Called to lay out the legend for a fieldset.
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virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; };
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// the implementation of the following functions is in bidi.cpp
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void bidiReorderLine(const BidiIterator &start, const BidiIterator &end, BidiState &bidi );
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BidiIterator findNextLineBreak(BidiIterator &start, BidiState &info );
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InlineFlowBox* constructLine(const BidiIterator& start, const BidiIterator& end);
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InlineFlowBox* createLineBoxes(RenderObject* obj);
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void computeHorizontalPositionsForLine(InlineFlowBox* lineBox, BidiState &bidi);
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void computeVerticalPositionsForLine(InlineFlowBox* lineBox);
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bool clearLineOfPageBreaks(InlineFlowBox* lineBox);
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void checkLinesForOverflow();
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void deleteEllipsisLineBoxes();
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void checkLinesForTextOverflow();
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// end bidi.cpp functions
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virtual void paint(PaintInfo& i, int tx, int ty);
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void paintObject(PaintInfo& i, int tx, int ty, bool paintOutline = true);
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void paintFloats(PaintInfo& i, int _tx, int _ty, bool paintSelection = false);
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void insertFloatingObject(RenderObject *o);
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void removeFloatingObject(RenderObject *o);
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// called from lineWidth, to position the floats added in the last line.
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void positionNewFloats();
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void clearFloats();
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int getClearDelta(RenderObject *child);
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virtual void markAllDescendantsWithFloatsForLayout(RenderObject* floatToRemove = 0);
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// FIXME: containsFloats() should not return true if the floating objects list
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// is empty. However, layoutInlineChildren() relies on the current behavior.
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// http://bugzilla.opendarwin.org/show_bug.cgi?id=7395#c3
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virtual bool hasFloats() const { return m_floatingObjects!=0; }
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virtual bool containsFloat(RenderObject* o) const;
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virtual bool hasOverhangingFloats() const { return floatBottom() > m_height; }
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void addOverHangingFloats( RenderBlock *block, int xoffset, int yoffset, bool child );
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int nearestFloatBottom(int height) const;
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int floatBottom() const;
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inline int leftBottom();
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inline int rightBottom();
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virtual unsigned short lineWidth(int y, bool *canClearLine = 0) const;
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virtual int lowestPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
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virtual int rightmostPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
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virtual int leftmostPosition(bool includeOverflowInterior=true, bool includeSelf=true) const;
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virtual int highestPosition(bool includeOverflowInterior, bool includeSelf) const;
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int lowestAbsolutePosition() const;
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int leftmostAbsolutePosition() const;
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int rightmostAbsolutePosition() const;
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int highestAbsolutePosition() const;
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int rightOffset() const;
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int rightRelOffset(int y, int fixedOffset, bool applyTextIndent=true, int *heightRemaining = 0, bool *canClearLine = 0) const;
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int rightOffset(int y, bool *canClearLine = 0) const { return rightRelOffset(y, rightOffset(), true, 0, canClearLine); }
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int leftOffset() const;
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int leftRelOffset(int y, int fixedOffset, bool applyTextIndent=true, int *heightRemaining = 0, bool *canClearLine = 0) const;
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int leftOffset(int y, bool *canClearLine = 0) const { return leftRelOffset(y, leftOffset(), true, 0, canClearLine); }
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virtual bool nodeAtPoint(NodeInfo& info, int x, int y, int _tx, int _ty, HitTestAction hitTestAction = HitTestAll, bool inside=false);
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bool isPointInScrollbar(int x, int y, int tx, int ty);
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virtual void calcMinMaxWidth();
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void calcInlineMinMaxWidth();
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void calcBlockMinMaxWidth();
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virtual void close();
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virtual int getBaselineOfFirstLineBox();
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virtual InlineFlowBox* getFirstLineBox();
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RootInlineBox* firstRootBox() { return static_cast<RootInlineBox*>(m_firstLineBox); }
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RootInlineBox* lastRootBox() { return static_cast<RootInlineBox*>(m_lastLineBox); }
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bool inRootBlockContext() const;
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#ifdef ENABLE_DUMP
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virtual void printTree(int indent=0) const;
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virtual void dump(TQTextStream &stream, const TQString &ind) const;
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#endif
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protected:
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void newLine();
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protected:
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struct FloatingObject {
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enum Type {
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FloatLeft,
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FloatRight
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};
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FloatingObject(Type _type) {
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node = 0;
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startY = 0;
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endY = 0;
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type = _type;
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left = 0;
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width = 0;
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noPaint = false;
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crossedLayer = false;
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}
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RenderObject* node;
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int startY;
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int endY;
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short left;
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short width;
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Type type : 1; // left or right aligned
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bool noPaint : 1;
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bool crossedLayer : 1; // lock noPaint flag
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};
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// The following helper functions and structs are used by layoutBlockChildren.
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class CompactInfo {
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// A compact child that needs to be collapsed into the margin of the following block.
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RenderObject* m_compact;
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// The block with the open margin that the compact child is going to place itself within.
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RenderObject* m_block;
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bool m_treatAsBlock : 1;
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public:
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RenderObject* compact() const { return m_compact; }
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RenderObject* block() const { return m_block; }
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void setTreatAsBlock(bool b) { m_treatAsBlock = b; }
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bool treatAsBlock() const { return m_treatAsBlock; }
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bool matches(RenderObject* child) const { return m_compact && m_block == child; }
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void clear() { set(0, 0); }
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void set(RenderObject* c, RenderObject* b) { m_compact = c; m_block = b; }
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CompactInfo() { clear(); }
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};
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class MarginInfo {
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// Collapsing flags for whether we can collapse our margins with our children's margins.
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bool m_canCollapseWithChildren : 1;
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bool m_canCollapseTopWithChildren : 1;
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bool m_canCollapseBottomWithChildren : 1;
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// Whether or not we are a quirky container, i.e., do we collapse away top and bottom
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// margins in our container. Table cells and the body are the common examples. We
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// also have a custom style property for Safari RSS to deal with TypePad blog articles.
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bool m_quirkContainer : 1;
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// This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block.
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// They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will
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// always be collapsing with one another. This variable can remain set to true through multiple iterations
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// as long as we keep encountering self-collapsing blocks.
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bool m_atTopOfBlock : 1;
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// This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block.
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bool m_atBottomOfBlock : 1;
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// If our last normal flow child was a self-collapsing block that cleared a float,
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// we track it in this variable.
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bool m_selfCollapsingBlockClearedFloat : 1;
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// These variables are used to detect quirky margins that we need to collapse away (in table cells
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// and in the body element).
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bool m_topQuirk : 1;
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bool m_bottomQuirk : 1;
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bool m_determinedTopQuirk : 1;
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// These flags track the previous maximal positive and negative margins.
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int m_posMargin;
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int m_negMargin;
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public:
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MarginInfo(RenderBlock* b, int top, int bottom);
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void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; }
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void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; }
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void clearMargin() { m_posMargin = m_negMargin = 0; }
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void setSelfCollapsingBlockClearedFloat(bool b) { m_selfCollapsingBlockClearedFloat = b; }
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void setTopQuirk(bool b) { m_topQuirk = b; }
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void setBottomQuirk(bool b) { m_bottomQuirk = b; }
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void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; }
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void setPosMargin(int p) { m_posMargin = p; }
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void setNegMargin(int n) { m_negMargin = n; }
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void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; }
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void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; }
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void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; }
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bool atTopOfBlock() const { return m_atTopOfBlock; }
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bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; }
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bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; }
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bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; }
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bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; }
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bool selfCollapsingBlockClearedFloat() const { return m_selfCollapsingBlockClearedFloat; }
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bool quirkContainer() const { return m_quirkContainer; }
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bool determinedTopQuirk() const { return m_determinedTopQuirk; }
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bool topQuirk() const { return m_topQuirk; }
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bool bottomQuirk() const { return m_bottomQuirk; }
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int posMargin() const { return m_posMargin; }
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int negMargin() const { return m_negMargin; }
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int margin() const { return m_posMargin - m_negMargin; }
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};
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class PageBreakInfo {
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int m_pageBottom; // Next calculated page-break
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bool m_forcePageBreak : 1; // Must break before next block
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// ### to do better "page-break-after/before: avoid" this struct
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// should keep a pagebreakAvoid block and gather children in it
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public:
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PageBreakInfo(int pageBottom) : m_pageBottom(pageBottom), m_forcePageBreak(false) {};
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bool forcePageBreak() { return m_forcePageBreak; }
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void setForcePageBreak(bool b) { m_forcePageBreak = b; }
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int pageBottom() { return m_pageBottom; };
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void setPageBottom(int bottom) { m_pageBottom = bottom; }
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};
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virtual bool canClear(RenderObject *child, PageBreakLevel level);
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void clearPageBreak(RenderObject* child, int pageBottom);
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void adjustPositionedBlock(RenderObject* child, const MarginInfo& marginInfo);
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void adjustFloatingBlock(const MarginInfo& marginInfo);
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RenderObject* handleSpecialChild(RenderObject* child, const MarginInfo& marginInfo, CompactInfo& compactInfo, bool& handled);
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RenderObject* handleFloatingChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled);
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RenderObject* handlePositionedChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled);
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RenderObject* handleCompactChild(RenderObject* child, CompactInfo& compactInfo, const MarginInfo& marginInfo, bool& handled);
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RenderObject* handleRunInChild(RenderObject* child, bool& handled);
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void collapseMargins(RenderObject* child, MarginInfo& marginInfo, int yPosEstimate);
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void clearFloatsIfNeeded(RenderObject* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin);
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void adjustSizeForCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo);
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void insertCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo);
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int estimateVerticalPosition(RenderObject* child, const MarginInfo& info);
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void determineHorizontalPosition(RenderObject* child);
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void handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo);
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void setCollapsedBottomMargin(const MarginInfo& marginInfo);
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void clearChildOfPageBreaks(RenderObject* child, PageBreakInfo &pageBreakInfo, MarginInfo &marginInfo);
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// End helper functions and structs used by layoutBlockChildren.
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protected:
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// How much content overflows out of our block vertically or horizontally (all we support
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// for now is spillage out of the bottom and the right, which are the common cases).
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int m_overflowHeight;
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int m_overflowWidth;
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// Left and top overflow.
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int m_overflowTop;
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int m_overflowLeft;
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private:
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TQPtrList<FloatingObject>* m_floatingObjects;
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TQPtrList<RenderObject>* m_positionedObjects;
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bool m_childrenInline : 1;
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bool m_firstLine : 1; // used in inline layouting
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EClear m_clearStatus : 2; // used during layuting of paragraphs
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bool m_avoidPageBreak : 1; // anonymous avoid page-break block
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bool m_topMarginQuirk : 1;
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bool m_bottomMarginQuirk : 1;
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short m_maxTopPosMargin;
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short m_maxTopNegMargin;
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short m_maxBottomPosMargin;
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short m_maxBottomNegMargin;
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};
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} // namespace
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#endif // RENDER_BLOCK_H
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