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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 {
WTF_MAKE_NONCOPYABLE(RenderOverflow); WTF_MAKE_FAST_ALLOCATED;
public:
RenderOverflow(const IntRect& layoutRect, const IntRect& visualRect)
: m_minYLayoutOverflow(layoutRect.y())
, m_maxYLayoutOverflow(layoutRect.maxY())
, m_minXLayoutOverflow(layoutRect.x())
, m_maxXLayoutOverflow(layoutRect.maxX())
, m_minYVisualOverflow(visualRect.y())
, m_maxYVisualOverflow(visualRect.maxY())
, m_minXVisualOverflow(visualRect.x())
, m_maxXVisualOverflow(visualRect.maxX())
{
}
int minYLayoutOverflow() const { return m_minYLayoutOverflow; }
int maxYLayoutOverflow() const { return m_maxYLayoutOverflow; }
int minXLayoutOverflow() const { return m_minXLayoutOverflow; }
int maxXLayoutOverflow() const { return m_maxXLayoutOverflow; }
IntRect layoutOverflowRect() const;
int minYVisualOverflow() const { return m_minYVisualOverflow; }
int maxYVisualOverflow() const { return m_maxYVisualOverflow; }
int minXVisualOverflow() const { return m_minXVisualOverflow; }
int maxXVisualOverflow() const { return m_maxXVisualOverflow; }
IntRect visualOverflowRect() const;
void setMinYLayoutOverflow(int overflow) { m_minYLayoutOverflow = overflow; }
void setMaxYLayoutOverflow(int overflow) { m_maxYLayoutOverflow = overflow; }
void setMinXLayoutOverflow(int overflow) { m_minXLayoutOverflow = overflow; }
void setMaxXLayoutOverflow(int overflow) { m_maxXLayoutOverflow = overflow; }
void setMinYVisualOverflow(int overflow) { m_minYVisualOverflow = overflow; }
void setMaxYVisualOverflow(int overflow) { m_maxYVisualOverflow = overflow; }
void setMinXVisualOverflow(int overflow) { m_minXVisualOverflow = overflow; }
void setMaxXVisualOverflow(int overflow) { m_maxXVisualOverflow = 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_minYLayoutOverflow;
int m_maxYLayoutOverflow;
int m_minXLayoutOverflow;
int m_maxXLayoutOverflow;
int m_minYVisualOverflow;
int m_maxYVisualOverflow;
int m_minXVisualOverflow;
int m_maxXVisualOverflow;
};
inline IntRect RenderOverflow::layoutOverflowRect() const
{
return IntRect(m_minXLayoutOverflow, m_minYLayoutOverflow, m_maxXLayoutOverflow - m_minXLayoutOverflow, m_maxYLayoutOverflow - m_minYLayoutOverflow);
}
inline IntRect RenderOverflow::visualOverflowRect() const
{
return IntRect(m_minXVisualOverflow, m_minYVisualOverflow, m_maxXVisualOverflow - m_minXVisualOverflow, m_maxYVisualOverflow - m_minYVisualOverflow);
}
inline void RenderOverflow::move(int dx, int dy)
{
m_minYLayoutOverflow += dy;
m_maxYLayoutOverflow += dy;
m_minXLayoutOverflow += dx;
m_maxXLayoutOverflow += dx;
m_minYVisualOverflow += dy;
m_maxYVisualOverflow += dy;
m_minXVisualOverflow += dx;
m_maxXVisualOverflow += dx;
}
inline void RenderOverflow::addLayoutOverflow(const IntRect& rect)
{
m_minYLayoutOverflow = std::min(rect.y(), m_minYLayoutOverflow);
m_maxYLayoutOverflow = std::max(rect.maxY(), m_maxYLayoutOverflow);
m_minXLayoutOverflow = std::min(rect.x(), m_minXLayoutOverflow);
m_maxXLayoutOverflow = std::max(rect.maxX(), m_maxXLayoutOverflow);
}
inline void RenderOverflow::addVisualOverflow(const IntRect& rect)
{
m_minYVisualOverflow = std::min(rect.y(), m_minYVisualOverflow);
m_maxYVisualOverflow = std::max(rect.maxY(), m_maxYVisualOverflow);
m_minXVisualOverflow = std::min(rect.x(), m_minXVisualOverflow);
m_maxXVisualOverflow = std::max(rect.maxX(), m_maxXVisualOverflow);
}
inline void RenderOverflow::setLayoutOverflow(const IntRect& rect)
{
m_minYLayoutOverflow = rect.y();
m_maxYLayoutOverflow = rect.maxY();
m_minXLayoutOverflow = rect.x();
m_maxXLayoutOverflow = rect.maxX();
}
inline void RenderOverflow::setVisualOverflow(const IntRect& rect)
{
m_minYVisualOverflow = rect.y();
m_maxYVisualOverflow = rect.maxY();
m_minXVisualOverflow = rect.x();
m_maxXVisualOverflow = rect.maxX();
}
inline void RenderOverflow::resetLayoutOverflow(const IntRect& rect)
{
m_minYLayoutOverflow = rect.y();
m_maxYLayoutOverflow = rect.maxY();
m_minXLayoutOverflow = rect.x();
m_maxXLayoutOverflow = rect.maxX();
}
} // namespace WebCore
#endif // RenderOverflow_h
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