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/*
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
*
* 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 RenderOverflow_h
#define RenderOverflow_h
#include "IntRect.h"
namespace WebCore
{
// RenderOverflow is a class for tracking content that spills out of a box. This class is used by RenderBox and
// InlineFlowBox.
//
// There are two types of overflow: layout overflow (which is expected to be reachable via scrolling mechanisms) and
// visual overflow (which is not expected to be reachable via scrolling mechanisms).
//
// Layout overflow examples include other boxes that spill out of our box, For example, in the inline case a tall image
// could spill out of a line box.
// Examples of visual overflow are shadows, text stroke (and eventually outline and border-image).
// This object is allocated only when some of these fields have non-default values in the owning box.
class RenderOverflow : public Noncopyable {
public:
RenderOverflow(const IntRect& layoutRect, const IntRect& visualRect)
: m_topLayoutOverflow(layoutRect.y())
, m_bottomLayoutOverflow(layoutRect.bottom())
, m_leftLayoutOverflow(layoutRect.x())
, m_rightLayoutOverflow(layoutRect.right())
, m_topVisualOverflow(visualRect.y())
, m_bottomVisualOverflow(visualRect.bottom())
, m_leftVisualOverflow(visualRect.x())
, m_rightVisualOverflow(visualRect.right())
{
}
int topLayoutOverflow() const { return m_topLayoutOverflow; }
int bottomLayoutOverflow() const { return m_bottomLayoutOverflow; }
int leftLayoutOverflow() const { return m_leftLayoutOverflow; }
int rightLayoutOverflow() const { return m_rightLayoutOverflow; }
IntRect layoutOverflowRect() const;
int topVisualOverflow() const { return m_topVisualOverflow; }
int bottomVisualOverflow() const { return m_bottomVisualOverflow; }
int leftVisualOverflow() const { return m_leftVisualOverflow; }
int rightVisualOverflow() const { return m_rightVisualOverflow; }
IntRect visualOverflowRect() const;
void setTopLayoutOverflow(int overflow) { m_topLayoutOverflow = overflow; }
void setBottomLayoutOverflow(int overflow) { m_bottomLayoutOverflow = overflow; }
void setLeftLayoutOverflow(int overflow) { m_leftLayoutOverflow = overflow; }
void setRightLayoutOverflow(int overflow) { m_rightLayoutOverflow = overflow; }
void setTopVisualOverflow(int overflow) { m_topVisualOverflow = overflow; }
void setBottomVisualOverflow(int overflow) { m_bottomVisualOverflow = overflow; }
void setLeftVisualOverflow(int overflow) { m_leftVisualOverflow = overflow; }
void setRightVisualOverflow(int overflow) { m_rightVisualOverflow = overflow; }
void move(int dx, int dy);
void addLayoutOverflow(const IntRect&);
void addVisualOverflow(const IntRect&);
void setLayoutOverflow(const IntRect&);
void setVisualOverflow(const IntRect&);
void resetLayoutOverflow(const IntRect& defaultRect);
private:
int m_topLayoutOverflow;
int m_bottomLayoutOverflow;
int m_leftLayoutOverflow;
int m_rightLayoutOverflow;
int m_topVisualOverflow;
int m_bottomVisualOverflow;
int m_leftVisualOverflow;
int m_rightVisualOverflow;
};
inline IntRect RenderOverflow::layoutOverflowRect() const
{
return IntRect(m_leftLayoutOverflow, m_topLayoutOverflow, m_rightLayoutOverflow - m_leftLayoutOverflow, m_bottomLayoutOverflow - m_topLayoutOverflow);
}
inline IntRect RenderOverflow::visualOverflowRect() const
{
return IntRect(m_leftVisualOverflow, m_topVisualOverflow, m_rightVisualOverflow - m_leftVisualOverflow, m_bottomVisualOverflow - m_topVisualOverflow);
}
inline void RenderOverflow::move(int dx, int dy)
{
m_topLayoutOverflow += dy;
m_bottomLayoutOverflow += dy;
m_leftLayoutOverflow += dx;
m_rightLayoutOverflow += dx;
m_topVisualOverflow += dy;
m_bottomVisualOverflow += dy;
m_leftVisualOverflow += dx;
m_rightVisualOverflow += dx;
}
inline void RenderOverflow::addLayoutOverflow(const IntRect& rect)
{
m_topLayoutOverflow = std::min(rect.y(), m_topLayoutOverflow);
m_bottomLayoutOverflow = std::max(rect.bottom(), m_bottomLayoutOverflow);
m_leftLayoutOverflow = std::min(rect.x(), m_leftLayoutOverflow);
m_rightLayoutOverflow = std::max(rect.right(), m_rightLayoutOverflow);
}
inline void RenderOverflow::addVisualOverflow(const IntRect& rect)
{
m_topVisualOverflow = std::min(rect.y(), m_topVisualOverflow);
m_bottomVisualOverflow = std::max(rect.bottom(), m_bottomVisualOverflow);
m_leftVisualOverflow = std::min(rect.x(), m_leftVisualOverflow);
m_rightVisualOverflow = std::max(rect.right(), m_rightVisualOverflow);
}
inline void RenderOverflow::setLayoutOverflow(const IntRect& rect)
{
m_topLayoutOverflow = rect.y();
m_bottomLayoutOverflow = rect.bottom();
m_leftLayoutOverflow = rect.x();
m_rightLayoutOverflow = rect.right();
}
inline void RenderOverflow::setVisualOverflow(const IntRect& rect)
{
m_topVisualOverflow = rect.y();
m_bottomVisualOverflow = rect.bottom();
m_leftVisualOverflow = rect.x();
m_rightVisualOverflow = rect.right();
}
inline void RenderOverflow::resetLayoutOverflow(const IntRect& rect)
{
m_topLayoutOverflow = rect.y();
m_bottomLayoutOverflow = rect.bottom();
m_leftLayoutOverflow = rect.x();
m_rightLayoutOverflow = rect.right();
}
} // namespace WebCore
#endif // RenderOverflow_h
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