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4 * This library is free software; you can redistribute it and/or
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12 * Library General Public License for more details.
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21 #ifndef RenderOverflow_h
22 #define RenderOverflow_h
24 #include "LayoutTypes.h"
28 // RenderOverflow is a class for tracking content that spills out of a box. This class is used by RenderBox and
31 // There are two types of overflow: layout overflow (which is expected to be reachable via scrolling mechanisms) and
32 // visual overflow (which is not expected to be reachable via scrolling mechanisms).
34 // Layout overflow examples include other boxes that spill out of our box, For example, in the inline case a tall image
35 // could spill out of a line box.
37 // Examples of visual overflow are shadows, text stroke (and eventually outline and border-image).
39 // This object is allocated only when some of these fields have non-default values in the owning box.
40 class RenderOverflow {
41 WTF_MAKE_NONCOPYABLE(RenderOverflow); WTF_MAKE_FAST_ALLOCATED;
43 RenderOverflow(const LayoutRect& layoutRect, const LayoutRect& visualRect)
44 : m_layoutOverflow(layoutRect)
45 , m_visualOverflow(visualRect)
49 const LayoutRect layoutOverflowRect() const { return m_layoutOverflow; }
50 const LayoutRect visualOverflowRect() const { return m_visualOverflow; }
52 void setMinYLayoutOverflow(LayoutUnit overflow) { m_layoutOverflow.setY(overflow); }
53 void setMaxYLayoutOverflow(LayoutUnit overflow) { m_layoutOverflow.setHeight(overflow - m_layoutOverflow.y()); }
54 void setMinXLayoutOverflow(LayoutUnit overflow) { m_layoutOverflow.setX(overflow); }
55 void setMaxXLayoutOverflow(LayoutUnit overflow) { m_layoutOverflow.setWidth(overflow - m_layoutOverflow.x()); }
57 void setMinYVisualOverflow(LayoutUnit overflow) { m_visualOverflow.setY(overflow); }
58 void setMaxYVisualOverflow(LayoutUnit overflow) { m_visualOverflow.setHeight(overflow - m_layoutOverflow.y()); }
59 void setMinXVisualOverflow(LayoutUnit overflow) { m_visualOverflow.setX(overflow); }
60 void setMaxXVisualOverflow(LayoutUnit overflow) { m_visualOverflow.setWidth(overflow - m_layoutOverflow.x()); }
62 void move(LayoutUnit dx, LayoutUnit dy);
64 void addLayoutOverflow(const LayoutRect&);
65 void addVisualOverflow(const LayoutRect&);
67 void setLayoutOverflow(const LayoutRect&);
68 void setVisualOverflow(const LayoutRect&);
71 LayoutRect m_layoutOverflow;
72 LayoutRect m_visualOverflow;
75 inline void RenderOverflow::move(LayoutUnit dx, LayoutUnit dy)
77 m_layoutOverflow.move(dx, dy);
78 m_visualOverflow.move(dx, dy);
81 inline void RenderOverflow::addLayoutOverflow(const LayoutRect& rect)
83 LayoutUnit maxX = std::max(rect.maxX(), m_layoutOverflow.maxX());
84 LayoutUnit maxY = std::max(rect.maxY(), m_layoutOverflow.maxY());
85 m_layoutOverflow.setX(std::min(rect.x(), m_layoutOverflow.x()));
86 m_layoutOverflow.setY(std::min(rect.y(), m_layoutOverflow.y()));
87 m_layoutOverflow.setWidth(maxX - m_layoutOverflow.x());
88 m_layoutOverflow.setHeight(maxY - m_layoutOverflow.y());
91 inline void RenderOverflow::addVisualOverflow(const LayoutRect& rect)
93 LayoutUnit maxX = std::max(rect.maxX(), m_visualOverflow.maxX());
94 LayoutUnit maxY = std::max(rect.maxY(), m_visualOverflow.maxY());
95 m_visualOverflow.setX(std::min(rect.x(), m_visualOverflow.x()));
96 m_visualOverflow.setY(std::min(rect.y(), m_visualOverflow.y()));
97 m_visualOverflow.setWidth(maxX - m_visualOverflow.x());
98 m_visualOverflow.setHeight(maxY - m_visualOverflow.y());
101 inline void RenderOverflow::setLayoutOverflow(const LayoutRect& rect)
103 m_layoutOverflow = rect;
106 inline void RenderOverflow::setVisualOverflow(const LayoutRect& rect)
108 m_visualOverflow = rect;
111 } // namespace WebCore
113 #endif // RenderOverflow_h