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319 lines
11 KiB
319 lines
11 KiB
/*
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* This file is part of the line box implementation for KDE.
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*
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* Copyright (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_LINE_H
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#define RENDER_LINE_H
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namespace tdehtml {
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class EllipsisBox;
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class InlineFlowBox;
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class RootInlineBox;
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// InlineBox represents a rectangle that occurs on a line. It corresponds to
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// some RenderObject (i.e., it represents a portion of that RenderObject).
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class InlineBox
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{
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public:
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InlineBox(RenderObject* obj)
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:m_object(obj), m_x(0), m_width(0), m_y(0), m_height(0), m_baseline(0),
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m_firstLine(false), m_constructed(false)
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{
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m_next = 0;
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m_prev = 0;
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m_parent = 0;
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}
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virtual ~InlineBox() {}
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void detach(RenderArena* renderArena);
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virtual void paint(RenderObject::PaintInfo& i, int _tx, int _ty);
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virtual bool nodeAtPoint(RenderObject::NodeInfo& i, int x, int y, int tx, int ty);
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// Overloaded new operator.
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void* operator new(size_t sz, RenderArena* renderArena) throw();
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// Overridden to prevent the normal delete from being called.
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void operator delete(void* ptr, size_t sz);
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private:
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// The normal operator new is disallowed.
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void* operator new(size_t sz) throw();
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public:
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virtual bool isInlineBox() const { return false; }
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virtual bool isInlineFlowBox() const { return false; }
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virtual bool isContainer() const { return false; }
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virtual bool isInlineTextBox() const { return false; }
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virtual bool isRootInlineBox() const { return false; }
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bool isConstructed() const { return m_constructed; }
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virtual void setConstructed() {
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m_constructed = true;
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if (m_next)
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m_next->setConstructed();
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}
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void setFirstLineStyleBit(bool f) { m_firstLine = f; }
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InlineBox* nextOnLine() { return m_next; }
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InlineBox* prevOnLine() { return m_prev; }
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RenderObject* object() const { return m_object; }
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InlineFlowBox* parent() { return m_parent; }
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void setParent(InlineFlowBox* par) { m_parent = par; }
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RootInlineBox* root();
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void setWidth(short w) {
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if (w < 0) {
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m_width = SHRT_MAX;
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kdDebug( 6040 ) << " InlineBox::setWidth() invalid negative width " << w << " specified!" << endl;
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}
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else {
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m_width = w;
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}
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}
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short width() const { return m_width; }
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void setXPos(short x) { m_x = x; }
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short xPos() const { return m_x; }
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void setYPos(int y) { m_y = y; }
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int yPos() const { return m_y; }
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void setHeight(int h) { m_height = h; }
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int height() const { return m_height; }
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void setBaseline(int b) { m_baseline = b; }
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int baseline() const { return m_baseline; }
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virtual bool hasTextChildren() const { return true; }
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virtual bool hasTextDescendant() const { return true; }
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virtual int topOverflow() const { return yPos(); }
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virtual int bottomOverflow() const { return yPos()+height(); }
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virtual long minOffset() const { return 0; }
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virtual long maxOffset() const { return 0; }
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virtual void clearTruncation() {};
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virtual bool canAccommodateEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth);
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virtual int placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool&);
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public: // FIXME: Would like to make this protected, but methods are accessing these
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// members over in the part.
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RenderObject* m_object;
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short m_x;
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short m_width;
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int m_y;
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int m_height;
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int m_baseline;
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bool m_firstLine : 1;
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bool m_constructed : 1;
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InlineBox* m_next; // The next element on the same line as us.
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InlineBox* m_prev; // The previous element on the same line as us.
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InlineFlowBox* m_parent; // The box that contains us.
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};
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class InlineRunBox : public InlineBox
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{
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public:
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InlineRunBox(RenderObject* obj)
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:InlineBox(obj)
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{
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m_prevLine = 0;
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m_nextLine = 0;
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}
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InlineRunBox* prevLineBox() { return m_prevLine; }
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InlineRunBox* nextLineBox() { return m_nextLine; }
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void setNextLineBox(InlineRunBox* n) { m_nextLine = n; }
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void setPreviousLineBox(InlineRunBox* p) { m_prevLine = p; }
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virtual void paintBackgroundAndBorder(RenderObject::PaintInfo&, int /*_tx*/, int /*_ty*/) {}
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virtual void paintDecorations(RenderObject::PaintInfo&, int /*_tx*/, int /*_ty*/, bool /*paintedChildren*/ = false) {}
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protected:
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InlineRunBox* m_prevLine; // The previous box that also uses our RenderObject
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InlineRunBox* m_nextLine; // The next box that also uses our RenderObject
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};
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class InlineFlowBox : public InlineRunBox
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{
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public:
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InlineFlowBox(RenderObject* obj)
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:InlineRunBox(obj)
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{
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m_firstChild = 0;
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m_lastChild = 0;
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m_includeLeftEdge = m_includeRightEdge = false;
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m_hasTextChildren = false;
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m_hasTextDescendant = false;
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m_afterPageBreak = false;
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}
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~InlineFlowBox();
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virtual bool isInlineFlowBox() const { return true; }
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InlineFlowBox* prevFlowBox() const { return static_cast<InlineFlowBox*>(m_prevLine); }
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InlineFlowBox* nextFlowBox() const { return static_cast<InlineFlowBox*>(m_nextLine); }
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InlineBox* firstChild() const { return m_firstChild; }
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InlineBox* lastChild() const { return m_lastChild; }
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virtual void setConstructed() {
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InlineBox::setConstructed();
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if (m_firstChild)
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m_firstChild->setConstructed();
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}
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void addToLine(InlineBox* child) {
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if (!m_firstChild)
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m_firstChild = m_lastChild = child;
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else {
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m_lastChild->m_next = child;
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child->m_prev = m_lastChild;
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m_lastChild = child;
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}
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child->setFirstLineStyleBit(m_firstLine);
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child->setParent(this);
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if (!m_hasTextChildren && child->isInlineTextBox()) {
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m_hasTextDescendant = m_hasTextChildren = true;
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for (InlineFlowBox* p = m_parent; p && !p->hasTextDescendant(); p = p->parent())
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p->m_hasTextDescendant = true;
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}
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}
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virtual void clearTruncation();
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void removeFromLine(InlineBox* child);
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virtual void paintBackgroundAndBorder(RenderObject::PaintInfo&, int _tx, int _ty);
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void paintBackgrounds(TQPainter* p, const TQColor& c, const BackgroundLayer* bgLayer,
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int my, int mh, int _tx, int _ty, int w, int h);
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void paintBackground(TQPainter* p, const TQColor& c, const BackgroundLayer* bgLayer,
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int my, int mh, int _tx, int _ty, int w, int h);
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virtual void paint(RenderObject::PaintInfo& i, int _tx, int _ty);
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virtual void paintDecorations(RenderObject::PaintInfo&, int _tx, int _ty, bool paintedChildren = false);
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virtual bool nodeAtPoint(RenderObject::NodeInfo& i, int x, int y, int tx, int ty);
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int marginBorderPaddingLeft() const;
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int marginBorderPaddingRight() const;
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int marginLeft() const;
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int marginRight( )const;
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int borderLeft() const { if (includeLeftEdge()) return object()->borderLeft(); return 0; }
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int borderRight() const { if (includeRightEdge()) return object()->borderRight(); return 0; }
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int paddingLeft() const { if (includeLeftEdge()) return object()->paddingLeft(); return 0; }
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int paddingRight() const { if (includeRightEdge()) return object()->paddingRight(); return 0; }
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bool includeLeftEdge() const { return m_includeLeftEdge; }
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bool includeRightEdge() const { return m_includeRightEdge; }
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void setEdges(bool includeLeft, bool includeRight) {
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m_includeLeftEdge = includeLeft;
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m_includeRightEdge = includeRight;
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}
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virtual bool hasTextChildren() const { return m_hasTextChildren; }
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bool hasTextDescendant() const { return m_hasTextDescendant; }
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// Helper functions used during line construction and placement.
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void determineSpacingForFlowBoxes(bool lastLine, RenderObject* endObject);
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int getFlowSpacingWidth() const;
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bool nextOnLineExists();
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bool prevOnLineExists();
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bool onEndChain(RenderObject* endObject);
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int placeBoxesHorizontally(int x);
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void verticallyAlignBoxes(int& heightOfBlock);
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void computeLogicalBoxHeights(int& maxPositionTop, int& maxPositionBottom,
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int& maxAscent, int& maxDescent, bool strictMode);
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void adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent,
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int maxPositionTop, int maxPositionBottom);
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void placeBoxesVertically(int y, int maxHeight, int maxAscent, bool strictMode,
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int& topPosition, int& bottomPosition);
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void shrinkBoxesWithNoTextChildren(int topPosition, int bottomPosition);
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virtual void setOverflowPositions(int /*top*/, int /*bottom*/) {}
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void setAfterPageBreak(bool b = true) { m_afterPageBreak = b; }
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bool afterPageBreak() const { return m_afterPageBreak; }
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virtual bool canAccommodateEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth);
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virtual int placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool&);
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protected:
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InlineBox* m_firstChild;
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InlineBox* m_lastChild;
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bool m_includeLeftEdge : 1;
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bool m_includeRightEdge : 1;
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bool m_hasTextChildren : 1;
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bool m_hasTextDescendant : 1;
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bool m_afterPageBreak : 1;
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};
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class RootInlineBox : public InlineFlowBox
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{
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public:
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RootInlineBox(RenderObject* obj) : InlineFlowBox(obj), m_ellipsisBox(0)
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{
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m_topOverflow = m_bottomOverflow = 0;
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}
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virtual void detach(RenderArena* renderArena);
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void detachEllipsisBox(RenderArena* renderArena);
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RootInlineBox* nextRootBox() { return static_cast<RootInlineBox*>(m_nextLine); }
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RootInlineBox* prevRootBox() { return static_cast<RootInlineBox*>(m_prevLine); }
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virtual bool isRootInlineBox() const { return true; }
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virtual int topOverflow() const { return m_topOverflow; }
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virtual int bottomOverflow() const { return m_bottomOverflow; }
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virtual void setOverflowPositions(int top, int bottom) { m_topOverflow = top; m_bottomOverflow = bottom; }
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bool canAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth);
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void placeEllipsis(const DOM::DOMString& ellipsisStr, bool ltr, int blockEdge, int ellipsisWidth, InlineBox* markupBox = 0);
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virtual int placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool&);
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EllipsisBox* ellipsisBox() const { return m_ellipsisBox; }
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void paintEllipsisBox(RenderObject::PaintInfo& i, int _tx, int _ty) const;
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bool hitTestEllipsisBox(RenderObject::NodeInfo& info, int _x, int _y, int _tx, int _ty);
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virtual void clearTruncation();
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virtual void paint(RenderObject::PaintInfo& i, int _tx, int _ty);
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virtual bool nodeAtPoint(RenderObject::NodeInfo& i, int x, int y, int tx, int ty);
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protected:
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int m_topOverflow;
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int m_bottomOverflow;
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// An inline text box that represents our text truncation string.
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EllipsisBox* m_ellipsisBox;
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};
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} //namespace
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#endif
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