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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 blink {
     29 
     30 class HTMLDimension;
     31 class HTMLFrameSetElement;
     32 class MouseEvent;
     33 
     34 enum FrameEdge { LeftFrameEdge, RightFrameEdge, TopFrameEdge, BottomFrameEdge };
     35 
     36 struct FrameEdgeInfo {
     37     FrameEdgeInfo(bool preventResize = false, bool allowBorder = true)
     38         : m_preventResize(4)
     39         , m_allowBorder(4)
     40     {
     41         m_preventResize.fill(preventResize);
     42         m_allowBorder.fill(allowBorder);
     43     }
     44 
     45     bool preventResize(FrameEdge edge) const { return m_preventResize[edge]; }
     46     bool allowBorder(FrameEdge edge) const { return m_allowBorder[edge]; }
     47 
     48     void setPreventResize(FrameEdge edge, bool preventResize) { m_preventResize[edge] = preventResize; }
     49     void setAllowBorder(FrameEdge edge, bool allowBorder) { m_allowBorder[edge] = allowBorder; }
     50 
     51 private:
     52     Vector<bool> m_preventResize;
     53     Vector<bool> m_allowBorder;
     54 };
     55 
     56 class RenderFrameSet FINAL : public RenderBox {
     57 public:
     58     RenderFrameSet(HTMLFrameSetElement*);
     59     virtual ~RenderFrameSet();
     60     virtual void trace(Visitor*) OVERRIDE;
     61 
     62     RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
     63     RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
     64 
     65     // If you have a RenderFrameSet, use firstChild or lastChild instead.
     66     void slowFirstChild() const WTF_DELETED_FUNCTION;
     67     void slowLastChild() const WTF_DELETED_FUNCTION;
     68 
     69     const RenderObjectChildList* children() const { return &m_children; }
     70     RenderObjectChildList* children() { return &m_children; }
     71 
     72     FrameEdgeInfo edgeInfo() const;
     73 
     74     bool userResize(MouseEvent*);
     75 
     76     bool canResizeRow(const IntPoint&) const;
     77     bool canResizeColumn(const IntPoint&) const;
     78 
     79     void notifyFrameEdgeInfoChanged();
     80 
     81 private:
     82     static const int noSplit = -1;
     83 
     84     class GridAxis {
     85         WTF_MAKE_NONCOPYABLE(GridAxis);
     86     public:
     87         GridAxis();
     88         void resize(int);
     89 
     90         Vector<int> m_sizes;
     91         Vector<int> m_deltas;
     92         Vector<bool> m_preventResize;
     93         Vector<bool> m_allowBorder;
     94         int m_splitBeingResized;
     95         int m_splitResizeOffset;
     96     };
     97 
     98     virtual RenderObjectChildList* virtualChildren() OVERRIDE { return children(); }
     99     virtual const RenderObjectChildList* virtualChildren() const OVERRIDE { return children(); }
    100 
    101     virtual const char* renderName() const OVERRIDE { return "RenderFrameSet"; }
    102     virtual bool isFrameSet() const OVERRIDE { return true; }
    103 
    104     virtual void layout() OVERRIDE;
    105     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
    106     virtual void computePreferredLogicalWidths() OVERRIDE;
    107     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const OVERRIDE;
    108     virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const OVERRIDE;
    109 
    110     inline HTMLFrameSetElement* frameSet() const;
    111 
    112     void setIsResizing(bool);
    113 
    114     void layOutAxis(GridAxis&, const Vector<HTMLDimension>&, int availableSpace);
    115     void computeEdgeInfo();
    116     void fillFromEdgeInfo(const FrameEdgeInfo& edgeInfo, int r, int c);
    117     void positionFrames();
    118 
    119     int splitPosition(const GridAxis&, int split) const;
    120     int hitTestSplit(const GridAxis&, int position) const;
    121 
    122     void startResizing(GridAxis&, int position);
    123     void continueResizing(GridAxis&, int position);
    124 
    125     void paintRowBorder(const PaintInfo&, const IntRect&);
    126     void paintColumnBorder(const PaintInfo&, const IntRect&);
    127 
    128     RenderObjectChildList m_children;
    129 
    130     GridAxis m_rows;
    131     GridAxis m_cols;
    132 
    133     bool m_isResizing;
    134     bool m_isChildResizing;
    135 };
    136 
    137 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFrameSet, isFrameSet());
    138 
    139 } // namespace blink
    140 
    141 #endif // RenderFrameSet_h
    142