1 /* 2 * Copyright (C) 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 27 #ifndef RenderMultiColumnBlock_h 28 #define RenderMultiColumnBlock_h 29 30 #include "core/rendering/RenderBlockFlow.h" 31 32 namespace WebCore { 33 34 class RenderMultiColumnFlowThread; 35 36 class RenderMultiColumnBlock FINAL : public RenderBlockFlow { 37 public: 38 RenderMultiColumnBlock(Element*); 39 40 LayoutUnit columnHeightAvailable() const { return m_columnHeightAvailable; } 41 42 LayoutUnit columnWidth() const { return m_columnWidth; } 43 unsigned columnCount() const { return m_columnCount; } 44 45 RenderMultiColumnFlowThread* flowThread() const { return m_flowThread; } 46 47 bool requiresBalancing() const { return !m_columnHeightAvailable || style()->columnFill() == ColumnFillBalance; } 48 49 private: 50 virtual bool isRenderMultiColumnBlock() const { return true; } 51 52 virtual const char* renderName() const; 53 54 virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) OVERRIDE; 55 56 virtual void styleDidChange(StyleDifference, const RenderStyle*) OVERRIDE; 57 58 virtual bool updateLogicalWidthAndColumnWidth() OVERRIDE; 59 virtual void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight) OVERRIDE; 60 virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer&) OVERRIDE; 61 62 virtual bool supportsPartialLayout() const OVERRIDE { return false; } 63 64 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE; 65 66 void computeColumnCountAndWidth(); 67 68 void ensureColumnSets(); 69 70 RenderMultiColumnFlowThread* m_flowThread; 71 unsigned m_columnCount; // The default column count/width that are based off our containing block width. These values represent only the default, 72 LayoutUnit m_columnWidth; // since a multi-column block that is split across variable width pages or regions will have different column counts and widths in each. 73 // These values will be cached (eventually) for multi-column blocks. 74 LayoutUnit m_columnHeightAvailable; // Total height available to columns, or 0 if auto. 75 bool m_inBalancingPass; // Set when relayouting for column balancing. 76 }; 77 78 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMultiColumnBlock, isRenderMultiColumnBlock()); 79 80 } // namespace WebCore 81 82 #endif // RenderMultiColumnBlock_h 83 84
