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| 1 /* | |
| 2 * Copyright (C) 2013 Google 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 are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #ifndef RenderLazyBlock_h | |
| 32 #define RenderLazyBlock_h | |
| 33 | |
| 34 #include "core/rendering/RenderBlock.h" | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 class RenderLazyBlock FINAL : public RenderBlock { | |
| 39 public: | |
| 40 RenderLazyBlock(Element*); | |
| 41 virtual ~RenderLazyBlock(); | |
| 42 | |
| 43 bool isAttached() const { return m_attached; } | |
| 44 bool isNested() const; | |
| 45 | |
| 46 void markForNestedLayout() | |
| 47 { | |
| 48 setNeedsLayout(); | |
| 49 m_isNestedLayout = true; | |
| 50 } | |
| 51 | |
| 52 RenderLazyBlock* next() const { return m_next; } | |
| 53 RenderLazyBlock* previous() const { return m_previous; } | |
| 54 | |
| 55 RenderBox* firstVisibleChildBox() const { return m_firstVisibleChildBox; } | |
| 56 RenderBox* lastVisibleChildBox() const { return m_lastVisibleChildBox; } | |
| 57 | |
| 58 private: | |
| 59 virtual void paintChildren(PaintInfo&, const LayoutPoint&) OVERRIDE; | |
| 60 | |
| 61 virtual bool isRenderLazyBlock() const OVERRIDE { return true; } | |
| 62 virtual void willBeDestroyed() OVERRIDE; | |
| 63 virtual void willBeRemovedFromTree() OVERRIDE; | |
| 64 virtual void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight
) OVERRIDE; | |
| 65 | |
| 66 void layoutChildren(bool relayoutChildren); | |
| 67 | |
| 68 void attachLazyBlock(); | |
| 69 void detachLazyBlock(); | |
| 70 | |
| 71 RenderLazyBlock* m_next; | |
| 72 RenderLazyBlock* m_previous; | |
| 73 RenderBox* m_firstVisibleChildBox; | |
| 74 RenderBox* m_lastVisibleChildBox; | |
| 75 bool m_attached; | |
| 76 bool m_isNestedLayout; | |
| 77 LayoutRect m_intersectRect; | |
| 78 IntRect m_expandedViewportRect; | |
| 79 }; | |
| 80 | |
| 81 inline RenderLazyBlock* toRenderLazyBlock(RenderObject* object) | |
| 82 { | |
| 83 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderLazyBlock()); | |
| 84 return static_cast<RenderLazyBlock*>(object); | |
| 85 } | |
| 86 | |
| 87 inline const RenderLazyBlock* toRenderLazyBlock(const RenderObject* object) | |
| 88 { | |
| 89 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderLazyBlock()); | |
| 90 return static_cast<const RenderLazyBlock*>(object); | |
| 91 } | |
| 92 | |
| 93 } // namespace WebCore | |
| 94 | |
| 95 #endif // RenderLazyBlock_h | |
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