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/*
* Copyright (C) 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LayoutState_h
#define LayoutState_h
#include "ColumnInfo.h"
#include "LayoutTypes.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class RenderArena;
class RenderBlock;
class RenderBox;
class RenderObject;
class RenderFlowThread;
class LayoutState {
WTF_MAKE_NONCOPYABLE(LayoutState);
public:
LayoutState()
: m_clipped(false)
, m_isPaginated(false)
, m_pageLogicalHeight(0)
, m_pageLogicalHeightChanged(false)
, m_columnInfo(0)
, m_lineGrid(0)
, m_next(0)
#ifndef NDEBUG
, m_renderer(0)
#endif
{
}
LayoutState(LayoutState*, RenderBox*, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged, ColumnInfo*);
LayoutState(LayoutState*, RenderFlowThread*, bool regionsChanged);
LayoutState(RenderObject*);
void destroy(RenderArena*);
// Overloaded new operator.
void* operator new(size_t, RenderArena*);
// Overridden to prevent the normal delete from being called.
void operator delete(void*, size_t);
void clearPaginationInformation();
bool isPaginatingColumns() const { return m_columnInfo && m_columnInfo->paginationUnit() == ColumnInfo::Column; }
bool isPaginated() const { return m_isPaginated; }
// The page logical offset is the object's offset from the top of the page in the page progression
// direction (so an x-offset in vertical text and a y-offset for horizontal text).
LayoutUnit pageLogicalOffset(LayoutUnit childLogicalOffset) const;
void addForcedColumnBreak(LayoutUnit childLogicalOffset);
LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
RenderBlock* lineGrid() const { return m_lineGrid; }
LayoutSize lineGridOffset() const { return m_lineGridOffset; }
LayoutSize lineGridPaginationOrigin() const { return m_lineGridPaginationOrigin; }
LayoutSize layoutOffset() const { return m_layoutOffset; }
bool needsBlockDirectionLocationSetBeforeLayout() const { return m_lineGrid || (m_isPaginated && m_pageLogicalHeight); }
private:
// The normal operator new is disallowed.
void* operator new(size_t) throw();
void propagateLineGridInfo(RenderBox*);
void establishLineGrid(RenderBlock*);
void computeLineGridPaginationOrigin(RenderBox*);
public:
bool m_clipped;
bool m_isPaginated;
LayoutRect m_clipRect;
// x/y offset from container. Includes relative positioning and scroll offsets.
LayoutSize m_paintOffset;
// x/y offset from container. Does not include relative positioning or scroll offsets.
LayoutSize m_layoutOffset;
// Transient offset from the final position of the object
// used to ensure that repaints happen in the correct place.
// This is a total delta accumulated from the root.
LayoutSize m_layoutDelta;
// The current page height for the pagination model that encloses us.
LayoutUnit m_pageLogicalHeight;
// If our page height has changed, this will force all blocks to relayout.
bool m_pageLogicalHeightChanged;
// The offset of the start of the first page in the nearest enclosing pagination model.
LayoutSize m_pageOffset;
// If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
ColumnInfo* m_columnInfo;
// The current line grid that we're snapping to and the offset of the start of the grid.
RenderBlock* m_lineGrid;
LayoutSize m_lineGridOffset;
LayoutSize m_lineGridPaginationOrigin;
LayoutState* m_next;
#ifndef NDEBUG
RenderObject* m_renderer;
#endif
};
} // namespace WebCore
#endif // LayoutState_h
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