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/*
* Copyright (C) 2007, 2013 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 "LayoutRect.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class RenderBlock;
class RenderBlockFlow;
class RenderBox;
class RenderElement;
class RenderFlowThread;
class RenderObject;
class ShapeInsideInfo;
class LayoutState {
WTF_MAKE_NONCOPYABLE(LayoutState); WTF_MAKE_FAST_ALLOCATED;
public:
LayoutState()
: m_clipped(false)
, m_isPaginated(false)
, m_pageLogicalHeightChanged(false)
#if !ASSERT_DISABLED && ENABLE(SATURATED_LAYOUT_ARITHMETIC)
, m_layoutDeltaXSaturated(false)
, m_layoutDeltaYSaturated(false)
#endif
, m_lineGrid(nullptr)
, m_pageLogicalHeight(0)
#ifndef NDEBUG
, m_renderer(nullptr)
#endif
{
}
LayoutState(std::unique_ptr<LayoutState>, RenderBox*, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged);
explicit LayoutState(RenderObject&);
void clearPaginationInformation();
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(RenderBox*, LayoutUnit childLogicalOffset) const;
LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
RenderBlockFlow* lineGrid() const { return m_lineGrid; }
LayoutSize lineGridOffset() const { return m_lineGridOffset; }
LayoutSize lineGridPaginationOrigin() const { return m_lineGridPaginationOrigin; }
LayoutSize layoutOffset() const { return m_layoutOffset; }
LayoutSize pageOffset() const { return m_pageOffset; }
void setLineGridPaginationOrigin(const LayoutSize& origin) { m_lineGridPaginationOrigin = origin; }
bool needsBlockDirectionLocationSetBeforeLayout() const { return m_lineGrid || (m_isPaginated && m_pageLogicalHeight); }
private:
void propagateLineGridInfo(RenderBox*);
void establishLineGrid(RenderBlockFlow*);
public:
// Do not add anything apart from bitfields. 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;
#if !ASSERT_DISABLED && ENABLE(SATURATED_LAYOUT_ARITHMETIC)
bool m_layoutDeltaXSaturated : 1;
bool m_layoutDeltaYSaturated : 1;
#endif
// The current line grid that we're snapping to and the offset of the start of the grid.
RenderBlockFlow* m_lineGrid;
std::unique_ptr<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;
LayoutSize m_lineGridOffset;
LayoutSize m_lineGridPaginationOrigin;
#ifndef NDEBUG
RenderObject* m_renderer;
#endif
};
} // namespace WebCore
#endif // LayoutState_h
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