180 lines
6.9 KiB
C++
180 lines
6.9 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "FrameViewLayoutContext.h"
|
|
#include "LayoutRect.h"
|
|
#include <wtf/Noncopyable.h>
|
|
|
|
namespace WebCore {
|
|
|
|
class RenderBlockFlow;
|
|
class RenderBox;
|
|
class RenderElement;
|
|
class RenderFragmentedFlow;
|
|
class RenderMultiColumnFlow;
|
|
class RenderObject;
|
|
|
|
class RenderLayoutState {
|
|
WTF_MAKE_NONCOPYABLE(RenderLayoutState); WTF_MAKE_FAST_ALLOCATED;
|
|
|
|
public:
|
|
RenderLayoutState()
|
|
: m_clipped(false)
|
|
, m_isPaginated(false)
|
|
, m_pageLogicalHeightChanged(false)
|
|
#if ASSERT_ENABLED
|
|
, m_layoutDeltaXSaturated(false)
|
|
, m_layoutDeltaYSaturated(false)
|
|
#endif
|
|
{
|
|
}
|
|
RenderLayoutState(const FrameViewLayoutContext::LayoutStateStack&, RenderBox&, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged);
|
|
enum class IsPaginated { No, Yes };
|
|
explicit RenderLayoutState(RenderElement&, IsPaginated = IsPaginated::No);
|
|
|
|
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.get(); }
|
|
LayoutSize lineGridOffset() const { return m_lineGridOffset; }
|
|
LayoutSize lineGridPaginationOrigin() const { return m_lineGridPaginationOrigin; }
|
|
|
|
LayoutSize paintOffset() const { return m_paintOffset; }
|
|
LayoutSize layoutOffset() const { return m_layoutOffset; }
|
|
|
|
LayoutSize pageOffset() const { return m_pageOffset; }
|
|
|
|
bool needsBlockDirectionLocationSetBeforeLayout() const { return m_lineGrid || (m_isPaginated && m_pageLogicalHeight); }
|
|
|
|
#if ASSERT_ENABLED
|
|
RenderElement* renderer() const { return m_renderer; }
|
|
#endif
|
|
LayoutRect clipRect() const { return m_clipRect; }
|
|
bool isClipped() const { return m_clipped; }
|
|
|
|
void addLayoutDelta(LayoutSize);
|
|
LayoutSize layoutDelta() const { return m_layoutDelta; }
|
|
#if ASSERT_ENABLED
|
|
bool layoutDeltaMatches(LayoutSize) const;
|
|
#endif
|
|
|
|
private:
|
|
void computeOffsets(const RenderLayoutState& ancestor, RenderBox&, LayoutSize offset);
|
|
void computeClipRect(const RenderLayoutState& ancestor, RenderBox&);
|
|
// FIXME: webkit.org/b/179440 these functions should be part of the pagination code/FrameViewLayoutContext.
|
|
void computePaginationInformation(const FrameViewLayoutContext::LayoutStateStack&, RenderBox&, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged);
|
|
void propagateLineGridInfo(const RenderLayoutState& ancestor, RenderBox&);
|
|
void establishLineGrid(const FrameViewLayoutContext::LayoutStateStack&, RenderBlockFlow&);
|
|
void computeLineGridPaginationOrigin(const RenderMultiColumnFlow&);
|
|
|
|
// 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_ENABLED
|
|
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.
|
|
WeakPtr<RenderBlockFlow> m_lineGrid;
|
|
|
|
// 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 layout root. Includes in-flow positioning and scroll offsets.
|
|
LayoutSize m_paintOffset;
|
|
// x/y offset from layout root. Does not include in-flow 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;
|
|
#if ASSERT_ENABLED
|
|
RenderElement* m_renderer { nullptr };
|
|
#endif
|
|
};
|
|
|
|
// Stack-based class to assist with LayoutState push/pop
|
|
class LayoutStateMaintainer {
|
|
WTF_MAKE_NONCOPYABLE(LayoutStateMaintainer);
|
|
public:
|
|
explicit LayoutStateMaintainer(RenderBox&, LayoutSize offset, bool disableState = false, LayoutUnit pageHeight = 0_lu, bool pageHeightChanged = false);
|
|
~LayoutStateMaintainer();
|
|
|
|
private:
|
|
FrameViewLayoutContext& m_context;
|
|
bool m_paintOffsetCacheIsDisabled { false };
|
|
bool m_didPushLayoutState { false };
|
|
};
|
|
|
|
class SubtreeLayoutStateMaintainer {
|
|
public:
|
|
SubtreeLayoutStateMaintainer(RenderElement* subtreeLayoutRoot);
|
|
~SubtreeLayoutStateMaintainer();
|
|
|
|
private:
|
|
FrameViewLayoutContext* m_context { nullptr };
|
|
bool m_didDisablePaintOffsetCache { false };
|
|
};
|
|
|
|
class LayoutStateDisabler {
|
|
WTF_MAKE_NONCOPYABLE(LayoutStateDisabler);
|
|
public:
|
|
LayoutStateDisabler(FrameViewLayoutContext&);
|
|
~LayoutStateDisabler();
|
|
|
|
private:
|
|
FrameViewLayoutContext& m_context;
|
|
};
|
|
|
|
class PaginatedLayoutStateMaintainer {
|
|
public:
|
|
PaginatedLayoutStateMaintainer(RenderBlockFlow&);
|
|
~PaginatedLayoutStateMaintainer();
|
|
|
|
private:
|
|
FrameViewLayoutContext& m_context;
|
|
bool m_pushed { false };
|
|
};
|
|
|
|
} // namespace WebCore
|