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Diffstat (limited to 'WebCore/rendering/RenderOverflow.h')
-rw-r--r-- | WebCore/rendering/RenderOverflow.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/WebCore/rendering/RenderOverflow.h b/WebCore/rendering/RenderOverflow.h new file mode 100644 index 0000000..ed8976a --- /dev/null +++ b/WebCore/rendering/RenderOverflow.h @@ -0,0 +1,153 @@ +/* + * 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: + RenderOverflow(const IntRect& defaultRect = IntRect()) + : m_topLayoutOverflow(defaultRect.y()) + , m_bottomLayoutOverflow(defaultRect.bottom()) + , m_leftLayoutOverflow(defaultRect.x()) + , m_rightLayoutOverflow(defaultRect.right()) + , m_topVisualOverflow(defaultRect.y()) + , m_bottomVisualOverflow(defaultRect.bottom()) + , m_leftVisualOverflow(defaultRect.x()) + , m_rightVisualOverflow(defaultRect.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; + + IntRect visibleOverflowRect() 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 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 IntRect RenderOverflow::visibleOverflowRect() const +{ + IntRect combinedRect(layoutOverflowRect()); + combinedRect.unite(visualOverflowRect()); + return combinedRect; +} + +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::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 |