| /* |
| * 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 |