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Side by Side Diff: Source/core/rendering/RenderLazyBlock.h

Issue 13937017: Implement lazy block layout prototype behind a runtime flag. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 7 years, 8 months ago
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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(true);
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& forSelf, const LayoutPoint&, PaintInfo & forChild, bool usePrintRect) 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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