File indexing completed on 2024-04-28 15:24:09

 /*
  * This file is part of the html renderer for KDE.
  *
  * Copyright (C) 2000-2003 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000-2003 Dirk Mueller (mueller@kde.org)
  *           (C) 2002-2003 Apple Computer, Inc.
  *           (C) 2004 Allan Sandfeld Jensen
  *
  * 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_object_h
 #define render_object_h
 
 #include <QColor>
 #include <QRect>
 #include <assert.h>
 #include <QList>
 
 #include <QDebug>
 
 #include "xml/dom_docimpl.h"
 #include "misc/khtmllayout.h"
 #include "misc/loader_client.h"
 #include "misc/helper.h"
 #include "rendering/render_style.h"
 #include "rendering/render_position.h"
 #include <QTextStream>
 
 // svg
 #include "FloatRect.h"
 #include "AffineTransform.h"
 
 using WebCore::FloatRect;
 using WebCore::AffineTransform;
 
 class QPainter;
 class QTextStream;
 template<class Key, class T> class QCache;
 
 #ifndef NDEBUG
 #define KHTMLAssert( x ) if( !(x) ) { \
         const RenderObject *o = this; while( o->parent() ) o = o->parent(); \
         o->printTree(); \
         qDebug(" this object = %p", (void*) this); \
         assert( x ); \
     }
 #else
 #define KHTMLAssert( x )
 #endif
 
 /*
  *  The painting of a layer occurs in three distinct phases.  Each phase involves
  *  a recursive descent into the layer's render objects. The first phase is the background phase.
  *  The backgrounds and borders of all blocks are painted.  Inlines are not painted at all.
  *  Floats must paint above block backgrounds but entirely below inline content that can overlap them.
  *  In the foreground phase, all inlines are fully painted.  Inline replaced elements will get all
  *  three phases invoked on them during this phase.
  */
 
 typedef enum {
     PaintActionElementBackground = 0,
     PaintActionChildBackground,
     PaintActionChildBackgrounds,
     PaintActionFloat,
     PaintActionForeground,
     PaintActionOutline,
     PaintActionSelection,
     PaintActionCollapsedTableBorders
 } PaintAction;
 
 typedef enum {
     HitTestAll = 0,
     HitTestSelfOnly = 1,
     HitTestChildrenOnly = 2
 } HitTestAction;
 
 typedef enum {
     PageBreakNormal = 0, // all rules apply
     PageBreakHarder = 1, // page-break-inside: avoid is ignored
     PageBreakForced = 2  // page-break-after/before: avoid, orphans and widows ignored
 } PageBreakLevel;
 
 typedef enum {
     LowPriority = 0,
     NormalPriority = 1,
     HighPriority = 2,
     RealtimePriority = 3
 } Priority;
 
 inline PageBreakLevel operator| (PageBreakLevel a, PageBreakLevel b)
 {
     if (a == PageBreakForced || b == PageBreakForced) {
         return PageBreakForced;
     }
     if (a == PageBreakHarder || b == PageBreakHarder) {
         return PageBreakHarder;
     }
     return PageBreakNormal;
 }
 
 namespace DOM
 {
 class HTMLAreaElementImpl;
 class NodeImpl;
 class DocumentImpl;
 class ElementImpl;
 class EventImpl;
 class Selection;
 }
 
 namespace khtml
 {
 class RenderFlow;
 class RenderStyle;
 class CachedObject;
 class RenderObject;
 class RenderCanvas;
 class RenderText;
 class RenderFrameSet;
 class RenderArena;
 class RenderLayer;
 class RenderBlock;
 class InlineBox;
 class InlineFlowBox;
 class CounterNode;
 class RenderPosition;
 
 /**
  * Base Class for all rendering tree objects.
  */
 class RenderObject : public CachedObjectClient
 {
     RenderObject(const RenderObject &);
     RenderObject &operator=(const RenderObject &);
 public:
     KHTML_EXPORT static void cleanup();
 
     RenderObject(DOM::NodeImpl *node);
     virtual ~RenderObject();
 
     RenderObject *parent() const
     {
         return m_parent;
     }
 
     RenderObject *previousSibling() const
     {
         return m_previous;
     }
     RenderObject *nextSibling() const
     {
         return m_next;
     }
 
     virtual RenderObject *firstChild() const
     {
         return nullptr;
     }
     virtual RenderObject *lastChild() const
     {
         return nullptr;
     }
 
     RenderObject *nextRenderer() const;
     RenderObject *previousRenderer() const;
 
     RenderObject *nextEditable() const;
     RenderObject *previousEditable() const;
 
     RenderObject *firstLeafChild() const;
     RenderObject *lastLeafChild() const;
 
     virtual bool childAllowed() const
     {
         return false;
     }
     virtual int borderTopExtra() const
     {
         return 0;
     }
     virtual int borderBottomExtra() const
     {
         return 0;
     }
 
     virtual RenderLayer *layer() const
     {
         return nullptr;
     }
     RenderLayer *enclosingLayer() const;
     RenderLayer *enclosingStackingContext() const;
     void addLayers(RenderLayer *parentLayer, RenderObject *newObject);
     void removeLayers(RenderLayer *parentLayer);
     void moveLayers(RenderLayer *oldParent, RenderLayer *newParent);
     RenderLayer *findNextLayer(RenderLayer *parentLayer, RenderObject *startPoint,
                                bool checkParent = true);
     virtual void positionChildLayers() { }
     virtual bool requiresLayer() const
     {
         return isRoot()/* ### */ || isPositioned() || isRelPositioned() || hasOverflowClip() || style()->opacity() < 1.0f;
     }
 
     virtual QRect overflowClipRect(int /*tx*/, int /*ty*/)
     {
         return QRect(0, 0, 0, 0);
     }
     virtual QRect clipRect(int /*tx*/, int /*ty*/)
     {
         return QRect(0, 0, 0, 0);
     }
     bool hasClip() const
     {
         return isPositioned() &&  style()->hasClip();
     }
     bool hasOverflowClip() const
     {
         return m_hasOverflowClip;
     }
 
     bool scrollsOverflow() const
     {
         return scrollsOverflowX() || scrollsOverflowY();
     }
     bool scrollsOverflowX() const
     {
         return  hasOverflowClip() && (style()->overflowX() == OSCROLL || style()->overflowX() == OAUTO);
     }
     bool scrollsOverflowY() const
     {
         return  hasOverflowClip() && (style()->overflowY() == OSCROLL || style()->overflowY() == OAUTO);
     }
 
     virtual int getBaselineOfFirstLineBox()
     {
         return -1;    // Tables and blocks implement this.
     }
     virtual InlineFlowBox *getFirstLineBox()
     {
         return nullptr;    // Tables and blocks implement this.
     }
 
     // Whether or not a positioned element requires normal flow x/y to be computed
     // to determine its position.
     bool hasStaticX() const
     {
         return style()->left().isAuto() && style()->right().isAuto();
     }
     bool hasStaticY() const
     {
         return style()->top().isAuto() && style()->bottom().isAuto();
     }
     bool isPosWithStaticDim()   const
     {
         return isPositioned() && (hasStaticX() || hasStaticY());
     }
 
     // Linear tree traversal
     RenderObject *objectBelow() const;
     RenderObject *objectAbove() const;
 
     // Returns if an object has counter-increment or counter-reset
     bool hasCounter(const DOMString &counter) const;
     // Calculates the value of the counter
     CounterNode *getCounter(const DOMString &counter, bool view = false, bool counters = false);
     // Detaches all counterNodes
     void detachCounters();
 
 protected:
     // Helper functions for counter-cache
     void insertCounter(const DOMString &counter, CounterNode *value);
     CounterNode *lookupCounter(const DOMString &counter) const;
 
 public:
     //////////////////////////////////////////
     // RenderObject tree manipulation
     virtual void addChild(RenderObject *newChild, RenderObject *beforeChild = nullptr);
     virtual void removeChild(RenderObject *oldChild);
 
     // raw tree manipulation
     virtual RenderObject *removeChildNode(RenderObject *child);
     virtual void appendChildNode(RenderObject *child);
     virtual void insertChildNode(RenderObject *child, RenderObject *before);
     //////////////////////////////////////////
 
     //////////////////////////////////////////
     // Helper functions. Dangerous to use!
     void setPreviousSibling(RenderObject *previous)
     {
         m_previous = previous;
     }
     void setNextSibling(RenderObject *next)
     {
         m_next = next;
     }
     void setParent(RenderObject *parent)
     {
         m_parent = parent;
     }
     //////////////////////////////////////////
 
 public:
     virtual const char *renderName() const
     {
         return "RenderObject";
     }
 #ifdef ENABLE_DUMP
     QString information() const;
     virtual void printTree(int indent = 0) const;
     virtual void dump(QTextStream &stream, const QString &ind = QString()) const;
     void printLineBoxTree() const;
 #endif
 
     static RenderObject *createObject(DOM::NodeImpl *node, RenderStyle *style);
 
     // Overloaded new operator.  Derived classes must override operator new
     // in order to allocate out of the RenderArena.
     void *operator new(size_t sz, RenderArena *renderArena) throw();
 
     // Overridden to prevent the normal delete from being called.
     void operator delete(void *ptr, size_t sz);
 
 private:
     // The normal operator new is disallowed on all render objects.
     void *operator new(size_t sz);
 
 public:
     RenderArena *renderArena() const;
     virtual RenderFlow *continuation() const
     {
         return nullptr;
     }
     virtual bool isInlineContinuation() const
     {
         return false;
     }
 
     bool isRoot() const
     {
         return m_isRoot && !m_isAnonymous;
     }
     void setIsRoot(bool b)
     {
         m_isRoot = b;
     }
     bool isHR() const;
     // some helper functions...
     virtual bool isRenderBlock() const
     {
         return false;
     }
     virtual bool isRenderInline() const
     {
         return false;
     }
     virtual bool isInlineFlow() const
     {
         return false;
     }
     virtual bool isBlockFlow() const
     {
         return false;
     }
     virtual bool isInlineBlockOrInlineTable() const
     {
         return false;
     }
     virtual bool childrenInline() const
     {
         return false;
     }
     virtual bool isBox() const
     {
         return false;
     }
     virtual bool isRenderReplaced() const
     {
         return false;
     }
 
     virtual bool isGlyph() const
     {
         return false;
     }
     virtual bool isCounter() const
     {
         return false;
     }
     virtual bool isQuote() const
     {
         return false;
     }
     virtual bool isListItem() const
     {
         return false;
     }
     virtual bool isListMarker() const
     {
         return false;
     }
     virtual bool isCanvas() const
     {
         return false;
     }
     virtual bool isBR() const
     {
         return false;
     }
     virtual bool isTableCell() const
     {
         return false;
     }
     virtual bool isTableRow() const
     {
         return false;
     }
     virtual bool isTableSection() const
     {
         return false;
     }
     virtual bool isTableCol() const
     {
         return false;
     }
     virtual bool isTable() const
     {
         return false;
     }
     virtual bool isWidget() const
     {
         return false;
     }
     virtual bool isBody() const
     {
         return false;
     }
     virtual bool isFormElement() const
     {
         return false;
     }
     virtual bool isFrameSet() const
     {
         return false;
     }
     virtual bool isApplet() const
     {
         return false;
     }
     virtual bool isMedia() const
     {
         return false;
     }
 
     virtual bool isEditable() const;
 
     // svg
     virtual bool isSVGRoot() const
     {
         return false;
     }
     virtual bool isRenderPath() const
     {
         return false;
     }
     virtual bool isSVGContainer() const
     {
         return false;
     }
     virtual bool isSVGText() const
     {
         return false;
     }
     virtual bool isSVGHiddenContainer() const
     {
         return false;
     }
 
     virtual FloatRect relativeBBox(bool includeStroke = false) const;
 
     virtual AffineTransform localTransform() const;
     virtual AffineTransform absoluteTransform() const;
     // end svg
 
     bool isHTMLMarquee() const;
     bool isWordBreak() const;
 
     bool isAnonymous() const
     {
         return m_isAnonymous;
     }
     void setIsAnonymous(bool b)
     {
         m_isAnonymous = b;
     }
     bool isAnonymousBlock() const
     {
         return isAnonymous() && style()->display() == BLOCK && node()->isDocumentNode();
     }
     bool isPseudoAnonymous() const
     {
         return isAnonymous() && !node()->isDocumentNode();
     }
 
     bool isFloating() const
     {
         return m_floating;
     }
     bool isPositioned() const
     {
         return m_positioned;
     }
     bool isRelPositioned() const
     {
         return m_relPositioned;
     }
     bool isText() const
     {
         return m_isText;
     }
     bool isInline() const
     {
         return m_inline;
     }
     bool isCompact() const
     {
         return style()->display() == COMPACT;    // compact
     }
     bool isRunIn() const
     {
         return style()->display() == RUN_IN;    // run-in object
     }
     bool mouseInside() const;
     bool isDragging() const;
     bool isReplaced() const
     {
         return m_replaced;
     }
     bool isReplacedBlock() const
     {
         return isInline() && isReplaced() && isRenderBlock();
     }
     bool shouldPaintBackgroundOrBorder() const
     {
         return m_paintBackground;
     }
     bool needsLayout() const
     {
         return m_needsLayout || m_normalChildNeedsLayout || m_posChildNeedsLayout;
     }
     bool markedForRepaint() const
     {
         return m_markedForRepaint;
     }
     void setMarkedForRepaint(bool m)
     {
         m_markedForRepaint = m;
     }
     bool selfNeedsLayout() const
     {
         return m_needsLayout;
     }
     bool posChildNeedsLayout() const
     {
         return m_posChildNeedsLayout;
     }
     bool normalChildNeedsLayout() const
     {
         return m_normalChildNeedsLayout;
     }
     bool minMaxKnown() const
     {
         return m_minMaxKnown;
     }
     bool hasFirstLine() const
     {
         return m_hasFirstLine;
     }
     bool isSelectionBorder() const
     {
         return m_isSelectionBorder;
     }
     bool recalcMinMax() const
     {
         return m_recalcMinMax;
     }
 
     RenderCanvas *canvas() const;
     // don't even think about making this method virtual!
     DOM::DocumentImpl *document() const;
     DOM::NodeImpl *element() const
     {
         return isAnonymous() ? nullptr : m_node;
     }
     DOM::NodeImpl *node() const
     {
         return m_node;
     }
 
     virtual bool handleEvent(const DOM::EventImpl &)
     {
         return false;
     }
 
     /**
       * returns the object containing this one. can be different from parent for
       * positioned elements
       */
     RenderObject *container() const;
 
     void markContainingBlocksForLayout();
     void dirtyFormattingContext(bool checkContainer);
     void repaintDuringLayout();
     void setNeedsLayout(bool b, bool markParents = true);
     void setChildNeedsLayout(bool b, bool markParents = true);
     void setMinMaxKnown(bool b = true)
     {
         m_minMaxKnown = b;
         if (!b) {
             RenderObject *o = this;
             while (o) {  // ### && !o->m_recalcMinMax ) {
                 o->m_recalcMinMax = true;
                 o = o->m_parent;
             }
         }
     }
     void setNeedsLayoutAndMinMaxRecalc()
     {
         setMinMaxKnown(false);
         setNeedsLayout(true);
     }
     void setPositioned(bool b = true)
     {
         m_positioned = b;
     }
     void setRelPositioned(bool b = true)
     {
         m_relPositioned = b;
     }
     void setFloating(bool b = true)
     {
         m_floating = b;
     }
     void setInline(bool b = true)
     {
         m_inline = b;
     }
     void setMouseInside(bool b = true)
     {
         m_mouseInside = b;
     }
     void setShouldPaintBackgroundOrBorder(bool b = true)
     {
         m_paintBackground = b;
     }
     void setRenderText()
     {
         m_isText = true;
     }
     void setReplaced(bool b = true)
     {
         m_replaced = b;
     }
     void setHasOverflowClip(bool b = true)
     {
         m_hasOverflowClip = b;
     }
     void setIsSelectionBorder(bool b = true)
     {
         m_isSelectionBorder = b;
     }
 
     void scheduleRelayout(RenderObject *clippedObj = nullptr);
 
     void updateBackgroundImages(RenderStyle *oldStyle);
 
     virtual InlineBox *createInlineBox(bool makePlaceHolderBox, bool isRootLineBox);
     virtual void removeInlineBox(InlineBox * /*box*/) {}
 
     virtual InlineBox *inlineBox(long offset = 0);
     virtual short lineHeight(bool firstLine) const;
     virtual short verticalPositionHint(bool firstLine) const;
     virtual short baselinePosition(bool firstLine) const;
     short getVerticalPosition(bool firstLine, RenderObject *ref = nullptr) const;
 
     /*
      * Print the object and its children, clipped by (x|y|w|h).
      * (tx|ty) is the calculated position of the parent
      */
     struct PaintInfo {
         PaintInfo(QPainter *_p, const QRect &_r, PaintAction _phase)
             : p(_p), r(_r), phase(_phase), outlineObjects(nullptr) {}
         ~PaintInfo()
         {
             delete outlineObjects;
         }
         QPainter *p;
         QRect     r;
         PaintAction phase;
         QList<RenderFlow *> *outlineObjects; // used to list which outlines should be painted by a block with inline children
     };
     virtual void paint(PaintInfo &i, int tx, int ty);
 
     void calcBorderRadii(QPoint &topLeftRadii, QPoint &topRightRadii, QPoint &bottomLeftRadii, QPoint &bottomRightRadii, int w, int h) const;
 
     void drawBorderArc(QPainter *p, int x, int y, float horThickness, float vertThickness,
                        const QPoint &radius, int angleStart, int angleSpan, const QBrush &brush,
                        const QColor &textColor, EBorderStyle style, qreal *dashOffset = nullptr) const;
 
     void paintBorder(QPainter *p, int _tx, int _ty, int w, int h, const RenderStyle *style, bool begin = true, bool end = true);
     void paintOutline(QPainter *p, int _tx, int _ty, int w, int h, const RenderStyle *style);
 
     virtual void paintBoxDecorations(PaintInfo &, int /*_tx*/, int /*_ty*/) {}
 
     virtual void paintBackgroundExtended(QPainter * /*p*/, const QColor & /*c*/, const BackgroundLayer * /*bgLayer*/,
                                          QRect /*clipr*/, int /*_tx*/, int /*_ty*/,
                                          int /*w*/, int /*height*/, int /*bleft*/, int /*bright*/, int /*pleft*/, int /*pright*/,
                                          int /*btop*/, int /*bbottom*/, int /*ptop*/, int /*pbottom*/) {}
 
     /*
      * This function calculates the minimum & maximum width that the object
      * can be set to.
      *
      * when the Element calls setMinMaxKnown(true), calcMinMaxWidth() will
      * be no longer called.
      *
      * when a element has a fixed size, m_minWidth and m_maxWidth should be
      * set to the same value. This has the special meaning that m_width,
      * contains the actual value.
      *
      * assumes calcMinMaxWidth has already been called for all children.
      */
     virtual void calcMinMaxWidth() { }
 
     /*
      * Does the min max width recalculations after changes.
      */
     void recalcMinMaxWidths();
 
     /*
      * Calculates the actual width of the object (only for non inline
      * objects)
      */
     virtual void calcWidth() {}
 
     /*
      * Calculates the actual width of the object (only for non inline
      * objects)
      */
     virtual void calcHeight() {}
 
     /*
      * This function should cause the Element to calculate its
      * width and height and the layout of its content
      *
      * when the Element calls setNeedsLayout(false), layout() is no
      * longer called during relayouts, as long as there is no
      * style sheet change. When that occurs, m_needsLayout will be
      * set to true and the Element receives layout() calls
      * again.
      */
     virtual void layout() = 0;
 
     /* This function performs a layout only if one is needed. */
     void layoutIfNeeded()
     {
         if (needsLayout()) {
             layout();
         }
     }
 
     // used for element state updates that can not be fixed with a
     // repaint and do not need a relayout
     virtual void updateFromElement() {}
 
     // Called immediately after render-object is inserted
     virtual void attach()
     {
         m_attached = true;
     }
     bool attached()
     {
         return m_attached;
     }
     // The corresponding closing element has been parsed. ### remove me
     virtual void close() { }
 
     virtual int availableHeight() const
     {
         return 0;
     }
 
     // Whether or not the element shrinks to its max width (rather than filling the width
     // of a containing block).  HTML4 buttons, legends, and floating/compact elements do this.
     bool sizesToMaxWidth() const;
 
     /*
      * NeesPageClear indicates the object crossed a page-break but could not break itself and now
      * needs to be moved clear by its parent.
      */
     void setNeedsPageClear(bool b = true)
     {
         m_needsPageClear = b;
     }
     virtual bool needsPageClear() const
     {
         return m_needsPageClear;
     }
 
     /*
      * ContainsPageBreak indicates the object contains a clean page-break.
      * ### should be removed and replaced with (crossesPageBreak && !needsPageClear)
      */
     void setContainsPageBreak(bool b = true)
     {
         m_containsPageBreak = b;
     }
     virtual bool containsPageBreak() const
     {
         return m_containsPageBreak;
     }
 
     virtual int pageTopAfter(int y) const
     {
         if (parent()) {
             return parent()->pageTopAfter(y);
         } else {
             return 0;
         }
     }
 
     virtual int crossesPageBreak(int top, int bottom) const
     {
         if (parent()) {
             return parent()->crossesPageBreak(top, bottom);
         } else {
             return 0;
         }
     }
 
     // Checks if a page-break before child is possible at the given page-break level
     // false means the child should attempt the break self.
     virtual bool canClear(RenderObject * /*child*/, PageBreakLevel level)
     {
         if (parent()) {
             return parent()->canClear(this, level);
         } else {
             return false;
         }
     }
 
     void setAfterPageBreak(bool b = true)
     {
         m_afterPageBreak = b;
     }
     void setBeforePageBreak(bool b = true)
     {
         m_beforePageBreak = b;
     }
     virtual bool afterPageBreak() const
     {
         return m_afterPageBreak;
     }
     virtual bool beforePageBreak() const
     {
         return m_beforePageBreak;
     }
 
     // does a query on the rendertree and finds the innernode
     // and overURL for the given position
     // if readonly == false, it will recalc hover styles accordingly
     class NodeInfo
     {
         friend class RenderImage;
         friend class RenderFlow;
         friend class RenderInline;
         friend class RenderText;
         friend class RenderWidget;
         friend class RenderObject;
         friend class RenderFrameSet;
         friend class RenderLayer;
         friend class DOM::HTMLAreaElementImpl;
     public:
         NodeInfo(bool readonly, bool active)
             : m_innerNode(nullptr), m_innerNonSharedNode(nullptr), m_innerURLElement(nullptr), m_readonly(readonly), m_active(active)
         { }
 
         DOM::NodeImpl *innerNode() const
         {
             return m_innerNode;
         }
         DOM::NodeImpl *innerNonSharedNode() const
         {
             return m_innerNonSharedNode;
         }
         DOM::NodeImpl *URLElement() const
         {
             return m_innerURLElement;
         }
         bool readonly() const
         {
             return m_readonly;
         }
         bool active() const
         {
             return m_active;
         }
 
     private:
         void setInnerNode(DOM::NodeImpl *n)
         {
             m_innerNode = n;
         }
         void setInnerNonSharedNode(DOM::NodeImpl *n)
         {
             m_innerNonSharedNode = n;
         }
         void setURLElement(DOM::NodeImpl *n)
         {
             m_innerURLElement = n;
         }
 
         DOM::NodeImpl *m_innerNode;
         DOM::NodeImpl *m_innerNonSharedNode;
         DOM::NodeImpl *m_innerURLElement;
         bool m_readonly;
         bool m_active;
     };
 
     /** contains stateful information for a checkSelectionPoint call
      */
     struct SelPointState {
         /** last node that was before the current position */
         DOM::NodeImpl *m_lastNode;
         /** offset of last node */
         long m_lastOffset;
         /** true when the last node had the result SelectionAfterInLine */
         bool m_afterInLine;
 
         SelPointState() : m_lastNode(nullptr), m_lastOffset(0), m_afterInLine(false)
         {}
     };
 
 #if 0
     virtual FindSelectionResult checkSelectionPoint(int _x, int _y, int _tx, int _ty,
             DOM::NodeImpl *&, int &offset,
             SelPointState &);
 #endif
     virtual bool nodeAtPoint(NodeInfo &info, int x, int y, int tx, int ty, HitTestAction, bool inside = false);
     void setInnerNode(NodeInfo &info);
 
     // Position/Selection stuff
     virtual RenderPosition positionForCoordinates(int x, int y);
 
     // set the style of the object.
     virtual void setStyle(RenderStyle *style);
 
     // returns the containing block level element for this element.
     RenderBlock *containingBlock() const;
 
     // return just the width of the containing block
     virtual short containingBlockWidth(RenderObject *providedCB = nullptr) const;
     // return just the height of the containing block
     virtual int containingBlockHeight(RenderObject *providedCB = nullptr) const;
 
     // size of the content area (box size minus padding/border)
     virtual short contentWidth() const
     {
         return 0;
     }
     virtual int contentHeight() const
     {
         return 0;
     }
 
     // intrinsic extend of replaced elements. undefined otherwise
     virtual short intrinsicWidth() const
     {
         return 0;
     }
     virtual int intrinsicHeight() const
     {
         return 0;
     }
 
     // relative to parent node
     virtual void setPos(int /*xPos*/, int /*yPos*/) { }
     virtual void setWidth(int /*width*/) { }
     virtual void setHeight(int /*height*/) { }
 
     virtual int xPos() const
     {
         return 0;
     }
     virtual int yPos() const
     {
         return 0;
     }
 
     /** the position of the object from where it begins drawing, including
      * its negative overflow
      */
     int effectiveXPos() const
     {
         return xPos() + (hasOverflowClip() ? 0 : overflowLeft());
     }
 
     /** the position of the object from where it begins drawing, including
      * its negative overflow
      */
     int effectiveYPos() const
     {
         return yPos() + (hasOverflowClip() ? -borderTopExtra() : qMin(overflowTop(), -borderTopExtra()));
     }
 
     /** Leftmost coordinate of this inline element relative to containing
      * block. Always zero for non-inline elements.
      */
     virtual int inlineXPos() const
     {
         return 0;
     }
     /** Topmost coordinate of this inline element relative to containing
      * block. Always zero for non-inline elements.
      */
     virtual int inlineYPos() const
     {
         return 0;
     }
 
     // calculate client position of box
     virtual bool absolutePosition(int &/*xPos*/, int &/*yPos*/, bool fixed = false) const;
 
     // width and height are without margins but include paddings and borders
     virtual short width() const
     {
         return 0;
     }
     virtual int height() const
     {
         return 0;
     }
 
     // The height 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 height();
     }
     virtual int overflowWidth() const
     {
         return width();
     }
     // how much goes over the left hand side (0 or a negative number)
     virtual int overflowTop() const
     {
         return 0;
     }
     virtual int overflowLeft() const
     {
         return 0;
     }
 
     /**
      * Returns the height that is effectively considered when contemplating the
      * object as a whole -- usually the overflow height, or the height if clipped.
      */
     int effectiveHeight() const
     {
         return hasOverflowClip() ? height() + borderTopExtra() + borderBottomExtra() :
                qMax(overflowHeight() - overflowTop(),  height() + borderTopExtra() + borderBottomExtra());
     }
     /**
      * Returns the width that is effectively considered when contemplating the
      * object as a whole -- usually the overflow width, or the width if clipped.
      */
     int effectiveWidth() const
     {
         return hasOverflowClip() ? width() : overflowWidth() - overflowLeft();
     }
 
     QRectF clientRectToViewport(const QRectF &rect);
     virtual QList< QRectF > getClientRects();
 
     // IE extensions, heavily used in ECMA
     virtual short offsetWidth() const
     {
         return width();
     }
     virtual int offsetHeight() const
     {
         return height() + borderTopExtra() + borderBottomExtra();
     }
     virtual int offsetLeft() const;
     virtual int offsetTop() const;
     virtual RenderObject *offsetParent() const;
     int clientLeft() const;
     int clientTop() const;
     short clientWidth() const;
     int clientHeight() const;
     virtual short scrollWidth() const;
     virtual int scrollHeight() const;
 
     virtual bool isSelfCollapsingBlock() const
     {
         return false;
     }
     short collapsedMarginTop() const
     {
         return maxTopMargin(true) - maxTopMargin(false);
     }
     short collapsedMarginBottom() const
     {
         return maxBottomMargin(true) - maxBottomMargin(false);
     }
 
     virtual bool isTopMarginQuirk() const
     {
         return false;
     }
     virtual bool isBottomMarginQuirk() const
     {
         return false;
     }
     virtual short maxTopMargin(bool positive) const
     {
         return positive ? qMax(int(marginTop()), 0) : - qMin(int(marginTop()), 0);
     }
     virtual short maxBottomMargin(bool positive) const
     {
         return positive ? qMax(int(marginBottom()), 0) : - qMin(int(marginBottom()), 0);
     }
 
     virtual short marginTop() const
     {
         return 0;
     }
     virtual short marginBottom() const
     {
         return 0;
     }
     virtual short marginLeft() const
     {
         return 0;
     }
     virtual short marginRight() const
     {
         return 0;
     }
 
     virtual int paddingTop() const;
     virtual int paddingBottom() const;
     virtual int paddingLeft() const;
     virtual int paddingRight() const;
 
     virtual int borderTop() const
     {
         return style()->borderTopWidth();
     }
     virtual int borderBottom() const
     {
         return style()->borderBottomWidth();
     }
     virtual int borderLeft() const
     {
         return style()->borderLeftWidth();
     }
     virtual int borderRight() const
     {
         return style()->borderRightWidth();
     }
 
     virtual short minWidth() const
     {
         return 0;
     }
     virtual int maxWidth() const
     {
         return 0;
     }
 
     RenderStyle *style() const
     {
         return m_style;
     }
     RenderStyle *style(bool firstLine) const
     {
         RenderStyle *s = m_style;
         if (firstLine && hasFirstLine()) {
             RenderStyle *pseudoStyle  = style()->getPseudoStyle(RenderStyle::FIRST_LINE);
             if (pseudoStyle) {
                 s = pseudoStyle;
             }
         }
         return s;
     }
 
     void getTextDecorationColors(int decorations, QColor &underline, QColor &overline,
                                  QColor &linethrough, bool quirksMode = false);
 
     enum BorderSide {
         BSTop, BSBottom, BSLeft, BSRight
     };
     void drawBorder(QPainter *p, int x1, int y1, int x2, int y2, BorderSide s,
                     QColor c, const QColor &textcolor, EBorderStyle style,
                     int adjbw1, int adjbw2, bool invalidisInvert = false, qreal *dashOffset = nullptr);
 
     // Used by collapsed border tables.
     virtual void collectBorders(QList<CollapsedBorderValue> &borderStyles);
 
     // force a complete repaint
     virtual void repaint(Priority p = NormalPriority)
     {
         if (m_parent) {
             m_parent->repaint(p);
         }
     }
     virtual void repaintRectangle(int x, int y, int w, int h, Priority p = NormalPriority, bool f = false);
 
     virtual unsigned int length() const
     {
         return 1;
     }
 
     virtual bool isHidden() const
     {
         return isFloating() || isPositioned();
     }
 
     // Special objects are objects that are neither really inline nor blocklevel
     bool isFloatingOrPositioned() const
     {
         return (isFloating() || isPositioned());
     }
     virtual bool hasOverhangingFloats() const
     {
         return false;
     }
     virtual bool hasFloats() const
     {
         return false;
     }
     virtual bool containsFloat(RenderObject * /*o*/) const
     {
         return false;
     }
     virtual void markAllDescendantsWithFloatsForLayout(RenderObject * /*floatToRemove*/ = nullptr) {}
 
     bool flowAroundFloats() const;
     bool usesLineWidth() const;
 
     // positioning of inline children (bidi)
     virtual void position(InlineBox *, int, int, bool) {}
 //    virtual void position(int, int, int, int, int, bool, bool, int) {}
 
     // Applied as a "slop" to dirty rect checks during the outline painting phase's dirty-rect checks.
     int maximalOutlineSize(PaintAction p) const;
 
     enum SelectionState {
         SelectionNone,
         SelectionStart,
         SelectionInside,
         SelectionEnd,
         SelectionBoth
     };
 
     virtual SelectionState selectionState() const
     {
         return SelectionNone;
     }
     virtual void setSelectionState(SelectionState) {}
     bool shouldSelect() const;
     virtual bool isPointInsideSelection(int x, int y, const DOM::Selection &) const;
 
     DOM::NodeImpl *draggableNode(bool dhtmlOK, bool uaOK, bool &dhtmlWillDrag) const;
 
     /**
      * Flags which influence the appearance and position
      * @param CFOverride input overrides existing character, caret should be
      *      cover the whole character
      * @param CFOutside coordinates are to be interpreted outside of the
      *      render object
      * @param CFOutsideEnd coordinates are to be interpreted at the outside
      *      end of the render object (only valid if CFOutside is also set)
      */
     enum CaretFlags { CFOverride = 0x01, CFOutside = 0x02, CFOutsideEnd = 0x04 };
 
     /**
      * Returns the content coordinates of the caret within this render object.
      * @param offset zero-based offset determining position within the render object.
      * @param flags combination of enum CaretFlags
      * @param _x returns the left coordinate
      * @param _y returns the top coordinate
      * @param width returns the caret's width
      * @param height returns the caret's height
      */
     virtual void caretPos(int offset, int flags, int &_x, int &_y, int &width, int &height) const;
 
     // returns the lowest position of the lowest object in that particular object.
     // This 'height' is relative to the topleft of the margin box of the object.
     // Implemented in RenderFlow.
     virtual int lowestPosition(bool /*includeOverflowInterior*/ = true, bool /*includeSelf*/ = true) const
     {
         return 0;
     }
     virtual int rightmostPosition(bool /*includeOverflowInterior*/ = true, bool /*includeSelf*/ = true) const
     {
         return 0;
     }
     virtual int leftmostPosition(bool /*includeOverflowInterior*/ = true, bool /*includeSelf*/ = true) const
     {
         return 0;
     }
     virtual int highestPosition(bool /*includeOverflowInterior*/ = true, bool /*includeSelf*/ = true) const
     {
         return 0;
     }
 
     // recursively invalidate current layout
     // unused: void invalidateLayout();
 
     virtual void calcVerticalMargins() {}
     void removeFromObjectLists();
     void setInPosObjectList(bool b = true)
     {
         m_inPosObjectList = b;
     }
     bool inPosObjectList() const
     {
         return m_inPosObjectList;
     }
 
     virtual void deleteInlineBoxes(RenderArena *arena = nullptr)
     {
         (void)arena;
     }
     virtual void dirtyInlineBoxes(bool /*fullLayout*/, bool /*isRootLineBox*/ = false) {}
     virtual void dirtyLinesFromChangedChild(RenderObject *) {}
     virtual void detach();
 
     bool documentBeingDestroyed() const
     {
         return !document()->renderer();
     }
 
     void setDoNotDelete(bool b)
     {
         m_doNotDelete = b;
     }
     bool doNotDelete() const
     {
         return m_doNotDelete;
     }
 
     const QFont &font(bool firstLine) const
     {
         return style(firstLine)->font();
     }
 
     const QFontMetrics &fontMetrics(bool firstLine) const
     {
         return style(firstLine)->fontMetrics();
     }
 
     /** returns the lowest possible value the caret offset may have to
      * still point to a valid position.
      *
      * Returns 0 by default.
      */
     virtual long caretMinOffset() const;
     /** returns the highest possible value the caret offset may have to
      * still point to a valid position.
      *
      * Returns 0 by default, as generic elements are considered to have no
      * width.
      */
     virtual long caretMaxOffset() const;
     virtual unsigned long caretMaxRenderedOffset() const;
 
     void updatePixmap(const QRect &, CachedImage *) override;
 
     QRegion visibleFlowRegion(int x, int y) const;
 
     virtual void removeSuperfluousAnonymousBlockChild(RenderObject *) {}
 
     // Unregisters from parent but does not destroy
     void remove();
 protected:
     virtual void selectionStartEnd(int &spos, int &epos);
 
     virtual QRect viewRect() const;
     void setDetached()
     {
         m_attached = false;
     }
     void invalidateVerticalPosition();
     bool attemptDirectLayerTranslation();
     void updateWidgetMasks();
 
     void arenaDelete(RenderArena *arena);
 
 private:
     RenderStyle *m_style;
     DOM::NodeImpl *m_node;
     RenderObject *m_parent;
     RenderObject *m_previous;
     RenderObject *m_next;
 
     short m_verticalPosition;
 
     bool m_needsLayout               : 1;
     bool m_normalChildNeedsLayout    : 1;
     bool m_markedForRepaint          : 1;
     bool m_posChildNeedsLayout       : 1;
 
     bool m_minMaxKnown               : 1;
     bool m_floating                  : 1;
 
     bool m_positioned                : 1;
     bool m_relPositioned             : 1;
     bool m_paintBackground           : 1; // if the box has something to paint in the
     // background painting phase (background, border, etc)
 
     bool m_isAnonymous               : 1;
     bool m_recalcMinMax          : 1;
     bool m_isText                    : 1;
     bool m_inline                    : 1;
     bool m_attached                  : 1;
 
     bool m_replaced                  : 1;
     bool m_mouseInside               : 1;
     bool m_hasFirstLine              : 1;
     bool m_isSelectionBorder         : 1;
 
     bool m_isRoot                    : 1;
 
     bool m_beforePageBreak           : 1;
     bool m_afterPageBreak            : 1;
 
     bool m_needsPageClear            : 1;
     bool m_containsPageBreak         : 1;
 
     bool m_hasOverflowClip           : 1;
     bool m_inPosObjectList           : 1;
 
     bool m_doNotDelete               : 1; // This object should not be auto-deleted
 
     // ### we have 16 + 26 bits.
 
     static QCache<quint64, QPixmap> *s_dashedLineCache;
 
     void arenaDelete(RenderArena *arena, void *objectBase);
 
     friend class RenderLayer;
     friend class RenderListItem;
     friend class RenderContainer;
     friend class RenderCanvas;
 };
 
 enum VerticalPositionHint {
     PositionTop = -0x4000,
     PositionBottom = 0x4000,
     PositionUndefined = 0x3fff
 };
 
 } //namespace
 #endif