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| 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 OVERRIDE { return true; } | |
| 51 | |
| 52 virtual const char* renderName() const OVERRIDE; | |
| 53 | |
| 54 virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren, Subt
reeLayoutScope&) OVERRIDE; | |
| 55 | |
| 56 virtual void styleDidChange(StyleDifference, const RenderStyle*) OVERRIDE; | |
| 57 | |
| 58 virtual bool updateLogicalWidthAndColumnWidth() OVERRIDE; | |
| 59 virtual void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHe
ight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight) OVERR
IDE; | |
| 60 virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, Layou
tUnit 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 o
ff 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 mu
lti-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 | |
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Chromium Code Reviews
Issue 143323014:
*** DO NOT LAND *** Attempt to understand Regions complexity
Base URL: svn://svn.chromium.org/blink/trunk