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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 "core/rendering/ColumnInfo.h"
#include "platform/geometry/LayoutRect.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"
namespace WebCore {
class ForceHorriblySlowRectMapping;
class RenderBox;
class RenderObject;
class RenderView;
class LayoutState {
WTF_MAKE_NONCOPYABLE(LayoutState);
public:
// Constructor for root LayoutState created by RenderView
LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, RenderView&);
// Constructor for sub-tree Layout and RenderTableSections
explicit LayoutState(RenderObject& root);
LayoutState(RenderBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = 0, bool pageHeightLogicalChanged = false, ColumnInfo* = 0);
~LayoutState();
void clearPaginationInformation();
bool isPaginatingColumns() const { return m_columnInfo; }
bool isPaginated() const { return m_isPaginated; }
bool isClipped() const { return m_clipped; }
// 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(const RenderBox&, const LayoutUnit& childLogicalOffset) const;
void addForcedColumnBreak(const RenderBox&, const LayoutUnit& childLogicalOffset);
void addLayoutDelta(const LayoutSize& delta)
{
m_layoutDelta += delta;
#if ASSERT_ENABLED
m_layoutDeltaXSaturated |= m_layoutDelta.width() == LayoutUnit::max() || m_layoutDelta.width() == LayoutUnit::min();
m_layoutDeltaYSaturated |= m_layoutDelta.height() == LayoutUnit::max() || m_layoutDelta.height() == LayoutUnit::min();
#endif
}
void setColumnInfo(ColumnInfo* columnInfo) { m_columnInfo = columnInfo; }
const LayoutSize& layoutOffset() const { return m_layoutOffset; }
const LayoutSize& layoutDelta() const { return m_layoutDelta; }
const LayoutSize& pageOffset() const { return m_pageOffset; }
LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
LayoutState* next() const { return m_next; }
bool needsBlockDirectionLocationSetBeforeLayout() const { return m_isPaginated && m_pageLogicalHeight; }
ColumnInfo* columnInfo() const { return m_columnInfo; }
bool cachedOffsetsEnabled() const { return m_cachedOffsetsEnabled; }
const LayoutRect& clipRect() const
{
ASSERT(m_cachedOffsetsEnabled);
return m_clipRect;
}
const LayoutSize& paintOffset() const
{
ASSERT(m_cachedOffsetsEnabled);
return m_paintOffset;
}
RenderObject& renderer() const { return m_renderer; }
#if ASSERT_ENABLED
bool layoutDeltaXSaturated() const { return m_layoutDeltaXSaturated; }
bool layoutDeltaYSaturated() const { return m_layoutDeltaYSaturated; }
#endif
private:
friend class ForceHorriblySlowRectMapping;
// Do not add anything apart from bitfields until after m_columnInfo. See https://bugs.webkit.org/show_bug.cgi?id=100173
bool m_clipped:1;
bool m_isPaginated:1;
// If our page height has changed, this will force all blocks to relayout.
bool m_pageLogicalHeightChanged:1;
bool m_cachedOffsetsEnabled:1;
#if ASSERT_ENABLED
bool m_layoutDeltaXSaturated:1;
bool m_layoutDeltaYSaturated:1;
#endif
// If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation.
ColumnInfo* m_columnInfo;
LayoutState* m_next;
// FIXME: Distinguish between the layout clip rect and the paint clip rect which may be larger,
// e.g., because of composited scrolling.
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;
// The offset of the start of the first page in the nearest enclosing pagination model.
LayoutSize m_pageOffset;
RenderObject& m_renderer;
};
} // namespace WebCore
#endif // LayoutState_h
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