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1 /* | 1 /* |
2 * Copyright (C) 2007 Apple Inc. All rights reserved. | 2 * Copyright (C) 2007 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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56 // practice like a stack that we push / pop. LayoutView holds the top-most | 56 // practice like a stack that we push / pop. LayoutView holds the top-most |
57 // pointer to this stack. | 57 // pointer to this stack. |
58 // | 58 // |
59 // See the layout() functions on how to set it up during layout. | 59 // See the layout() functions on how to set it up during layout. |
60 // See e.g LayoutBox::offsetFromLogicalTopOfFirstPage on how to use LayoutState | 60 // See e.g LayoutBox::offsetFromLogicalTopOfFirstPage on how to use LayoutState |
61 // for computations. | 61 // for computations. |
62 class LayoutState { | 62 class LayoutState { |
63 // LayoutState is always allocated on the stack. | 63 // LayoutState is always allocated on the stack. |
64 // The reason is that it is scoped to layout, thus we can avoid expensive | 64 // The reason is that it is scoped to layout, thus we can avoid expensive |
65 // mallocs. | 65 // mallocs. |
66 DISALLOW_ALLOCATION(); | 66 DISALLOW_NEW(); |
67 WTF_MAKE_NONCOPYABLE(LayoutState); | 67 WTF_MAKE_NONCOPYABLE(LayoutState); |
68 public: | 68 public: |
69 // Constructor for root LayoutState created by LayoutView | 69 // Constructor for root LayoutState created by LayoutView |
70 LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, Lay
outView&); | 70 LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, Lay
outView&); |
71 // Constructor for sub-tree layout | 71 // Constructor for sub-tree layout |
72 explicit LayoutState(LayoutObject& root); | 72 explicit LayoutState(LayoutObject& root); |
73 | 73 |
74 LayoutState(LayoutBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeig
ht = 0, bool pageHeightLogicalChanged = false, bool containingBlockLogicalWidthC
hanged = false); | 74 LayoutState(LayoutBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeig
ht = 0, bool pageHeightLogicalChanged = false, bool containingBlockLogicalWidthC
hanged = false); |
75 | 75 |
76 ~LayoutState(); | 76 ~LayoutState(); |
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113 LayoutUnit m_pageLogicalHeight; | 113 LayoutUnit m_pageLogicalHeight; |
114 // The offset of the start of the first page in the nearest enclosing pagina
tion model. | 114 // The offset of the start of the first page in the nearest enclosing pagina
tion model. |
115 LayoutSize m_pageOffset; | 115 LayoutSize m_pageOffset; |
116 | 116 |
117 LayoutObject& m_layoutObject; | 117 LayoutObject& m_layoutObject; |
118 }; | 118 }; |
119 | 119 |
120 } // namespace blink | 120 } // namespace blink |
121 | 121 |
122 #endif // LayoutState_h | 122 #endif // LayoutState_h |
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