third_party/WebKit/Source/core/layout/LayoutFrameSet.h

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 2000 Simon Hausmann <hausmann@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 LayoutFrameSet_h
  24 #define LayoutFrameSet_h
  25
  26 #include "core/layout/LayoutBox.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     STACK_ALLOCATED();
  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 LayoutFrameSet final : public LayoutBox {
  58 public:
  59     LayoutFrameSet(HTMLFrameSetElement*);
  60     ~LayoutFrameSet() override;
  61
  62     LayoutObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
  63     LayoutObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
  64
  65     // If you have a LayoutFrameSet, use firstChild or lastChild instead.
  66     void slowFirstChild() const = delete;
  67     void slowLastChild() const = delete;
  68
  69     const LayoutObjectChildList* children() const { return &m_children; }
  70     LayoutObjectChildList* 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     HTMLFrameSetElement* frameSet() const;
  81
  82     class GridAxis {
  83         DISALLOW_ALLOCATION();
  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     const GridAxis& rows() { return m_rows; }
  98     const GridAxis& columns() { return m_cols; }
  99
 100     const char* name() const override { return "LayoutFrameSet"; }
 101
 102 private:
 103     static const int noSplit = -1;
 104
 105     LayoutObjectChildList* virtualChildren() override { return children(); }
 106     const LayoutObjectChildList* virtualChildren() const override { return children(); }
 107
 108     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectFrameSet || LayoutBox::isOfType(type); }
 109
 110     void layout() override;
 111     void paint(const PaintInfo&, const LayoutPoint&) override;
 112     void computePreferredLogicalWidths() override;
 113     bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
 114     CursorDirective getCursor(const LayoutPoint&, Cursor&) const override;
 115
 116     void setIsResizing(bool);
 117
 118     void layOutAxis(GridAxis&, const Vector<HTMLDimension>&, int availableSpace);
 119     void computeEdgeInfo();
 120     void fillFromEdgeInfo(const FrameEdgeInfo&, int r, int c);
 121     void positionFrames();
 122
 123     int splitPosition(const GridAxis&, int split) const;
 124     int hitTestSplit(const GridAxis&, int position) const;
 125
 126     void startResizing(GridAxis&, int position);
 127     void continueResizing(GridAxis&, int position);
 128
 129     LayoutObjectChildList m_children;
 130
 131     GridAxis m_rows;
 132     GridAxis m_cols;
 133
 134     bool m_isResizing;
 135     bool m_isChildResizing;
 136 };
 137
 138 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFrameSet, isFrameSet());
 139
 140 } // namespace blink
 141
 142 #endif // LayoutFrameSet_h