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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Simon Hausmann <hausmann (at) kde.org>
      4  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  *
     21  */
     22 
     23 #ifndef RenderFrameSet_h
     24 #define RenderFrameSet_h
     25 
     26 #include "core/rendering/RenderBox.h"
     27 
     28 namespace WebCore {
     29 
     30 class HTMLDimension;
     31 class HTMLFrameSetElement;
     32 class MouseEvent;
     33 class RenderFrame;
     34 
     35 enum FrameEdge { LeftFrameEdge, RightFrameEdge, TopFrameEdge, BottomFrameEdge };
     36 
     37 struct FrameEdgeInfo {
     38     FrameEdgeInfo(bool preventResize = false, bool allowBorder = true)
     39         : m_preventResize(4)
     40         , m_allowBorder(4)
     41     {
     42         m_preventResize.fill(preventResize);
     43         m_allowBorder.fill(allowBorder);
     44     }
     45 
     46     bool preventResize(FrameEdge edge) const { return m_preventResize[edge]; }
     47     bool allowBorder(FrameEdge edge) const { return m_allowBorder[edge]; }
     48 
     49     void setPreventResize(FrameEdge edge, bool preventResize) { m_preventResize[edge] = preventResize; }
     50     void setAllowBorder(FrameEdge edge, bool allowBorder) { m_allowBorder[edge] = allowBorder; }
     51 
     52 private:
     53     Vector<bool> m_preventResize;
     54     Vector<bool> m_allowBorder;
     55 };
     56 
     57 class RenderFrameSet FINAL : public RenderBox {
     58 public:
     59     RenderFrameSet(HTMLFrameSetElement*);
     60     virtual ~RenderFrameSet();
     61 
     62     RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
     63     RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
     64 
     65     const RenderObjectChildList* children() const { return &m_children; }
     66     RenderObjectChildList* children() { return &m_children; }
     67 
     68     FrameEdgeInfo edgeInfo() const;
     69 
     70     bool userResize(MouseEvent*);
     71 
     72     bool isResizingRow() const;
     73     bool isResizingColumn() const;
     74 
     75     bool canResizeRow(const IntPoint&) const;
     76     bool canResizeColumn(const IntPoint&) const;
     77 
     78     void notifyFrameEdgeInfoChanged();
     79 
     80 private:
     81     static const int noSplit = -1;
     82 
     83     class GridAxis {
     84         WTF_MAKE_NONCOPYABLE(GridAxis);
     85     public:
     86         GridAxis();
     87         void resize(int);
     88 
     89         Vector<int> m_sizes;
     90         Vector<int> m_deltas;
     91         Vector<bool> m_preventResize;
     92         Vector<bool> m_allowBorder;
     93         int m_splitBeingResized;
     94         int m_splitResizeOffset;
     95     };
     96 
     97     virtual RenderObjectChildList* virtualChildren() { return children(); }
     98     virtual const RenderObjectChildList* virtualChildren() const { return children(); }
     99 
    100     virtual const char* renderName() const { return "RenderFrameSet"; }
    101     virtual bool isFrameSet() const { return true; }
    102 
    103     virtual void layout();
    104     virtual void paint(PaintInfo&, const LayoutPoint&);
    105     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
    106     virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
    107 
    108     inline HTMLFrameSetElement* frameSet() const;
    109 
    110     void setIsResizing(bool);
    111 
    112     void layOutAxis(GridAxis&, const Vector<HTMLDimension>&, int availableSpace);
    113     void computeEdgeInfo();
    114     void fillFromEdgeInfo(const FrameEdgeInfo& edgeInfo, int r, int c);
    115     void positionFrames();
    116 
    117     int splitPosition(const GridAxis&, int split) const;
    118     int hitTestSplit(const GridAxis&, int position) const;
    119 
    120     void startResizing(GridAxis&, int position);
    121     void continueResizing(GridAxis&, int position);
    122 
    123     void paintRowBorder(const PaintInfo&, const IntRect&);
    124     void paintColumnBorder(const PaintInfo&, const IntRect&);
    125 
    126     RenderObjectChildList m_children;
    127 
    128     GridAxis m_rows;
    129     GridAxis m_cols;
    130 
    131     bool m_isResizing;
    132     bool m_isChildResizing;
    133 };
    134 
    135 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFrameSet, isFrameSet());
    136 
    137 } // namespace WebCore
    138 
    139 #endif // RenderFrameSet_h
    140