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1 /* | 1 /* |
2 * Copyright (C) 2012 Apple Inc. All rights reserved. | 2 * Copyright (C) 2012 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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25 | 25 |
26 | 26 |
27 #ifndef RenderMultiColumnSet_h | 27 #ifndef RenderMultiColumnSet_h |
28 #define RenderMultiColumnSet_h | 28 #define RenderMultiColumnSet_h |
29 | 29 |
30 #include "core/rendering/RenderRegionSet.h" | 30 #include "core/rendering/RenderRegionSet.h" |
31 #include "wtf/Vector.h" | 31 #include "wtf/Vector.h" |
32 | 32 |
33 namespace WebCore { | 33 namespace WebCore { |
34 | 34 |
35 // RenderMultiColumnSet represents a set of columns that all have the same width
and height. By combining runs of same-size columns into a single | 35 // RenderMultiColumnSet represents a set of columns that all have the same width
and height. By |
36 // object, we significantly reduce the number of unique RenderObjects required t
o represent columns. | 36 // combining runs of same-size columns into a single object, we significantly re
duce the number of |
| 37 // unique RenderObjects required to represent columns. |
37 // | 38 // |
38 // A simple multi-column block will have exactly one RenderMultiColumnSet child.
A simple paginated multi-column block will have three | 39 // Column sets are inserted as anonymous children of the actual multicol contain
er (i.e. the |
39 // RenderMultiColumnSet children: one for the content at the bottom of the first
page (whose columns will have a shorter height), one | 40 // renderer whose style computes to non-auto column-count and/or column-width). |
40 // for the 2nd to n-1 pages, and then one last column set that will hold the sho
rter columns on the final page (that may have to be balanced | |
41 // as well). | |
42 // | 41 // |
43 // Column spans result in the creation of new column sets as well, since a spann
ing region has to be placed in between the column sets that | 42 // Being a "region", a column set has no children on its own, but is merely used
to slice a portion |
44 // come before and after the span. | 43 // of the tall "single-column" flow thread into actual columns visually, to conv
ert from flow thread |
| 44 // coordinates to visual ones. It is in charge of both positioning columns corre
ctly relatively to |
| 45 // the parent multicol container, and to calculate the correct translation for e
ach column's |
| 46 // contents, and to paint any rules between them. RenderMultiColumnSet objects a
re used for |
| 47 // painting, hit testing, and any other type of operation that requires mapping
from flow thread |
| 48 // coordinates to visual coordinates. |
| 49 // |
| 50 // Column spans result in the creation of new column sets, since a spanning rend
erer has to be |
| 51 // placed in between the column sets that come before and after the span. |
45 class RenderMultiColumnSet FINAL : public RenderRegionSet { | 52 class RenderMultiColumnSet FINAL : public RenderRegionSet { |
46 public: | 53 public: |
47 static RenderMultiColumnSet* createAnonymous(RenderFlowThread*); | 54 static RenderMultiColumnSet* createAnonymous(RenderFlowThread*, RenderStyle*
parentStyle); |
48 | 55 |
49 virtual bool isRenderMultiColumnSet() const OVERRIDE { return true; } | 56 virtual bool isRenderMultiColumnSet() const OVERRIDE { return true; } |
50 | 57 |
51 RenderBlockFlow* multiColumnBlockFlow() const { return toRenderBlockFlow(par
ent()); } | 58 RenderBlockFlow* multiColumnBlockFlow() const { return toRenderBlockFlow(par
ent()); } |
52 RenderMultiColumnFlowThread* multiColumnFlowThread() const { return multiCol
umnBlockFlow()->multiColumnFlowThread(); } | 59 RenderMultiColumnFlowThread* multiColumnFlowThread() const { return multiCol
umnBlockFlow()->multiColumnFlowThread(); } |
| 60 |
| 61 RenderMultiColumnSet* nextSiblingMultiColumnSet() const; |
| 62 |
53 unsigned computedColumnCount() const { return m_computedColumnCount; } | 63 unsigned computedColumnCount() const { return m_computedColumnCount; } |
54 LayoutUnit computedColumnWidth() const { return m_computedColumnWidth; } | 64 LayoutUnit computedColumnWidth() const { return m_computedColumnWidth; } |
55 LayoutUnit computedColumnHeight() const { return m_computedColumnHeight; } | 65 LayoutUnit computedColumnHeight() const { return m_computedColumnHeight; } |
56 | 66 |
57 void setComputedColumnWidthAndCount(LayoutUnit width, unsigned count) | 67 void setComputedColumnWidthAndCount(LayoutUnit width, unsigned count) |
58 { | 68 { |
59 m_computedColumnWidth = width; | 69 m_computedColumnWidth = width; |
60 m_computedColumnCount = count; | 70 m_computedColumnCount = count; |
61 } | 71 } |
62 | 72 |
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169 }; | 179 }; |
170 Vector<ContentRun, 1> m_contentRuns; | 180 Vector<ContentRun, 1> m_contentRuns; |
171 }; | 181 }; |
172 | 182 |
173 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMultiColumnSet, isRenderMultiColumnSet()); | 183 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMultiColumnSet, isRenderMultiColumnSet()); |
174 | 184 |
175 } // namespace WebCore | 185 } // namespace WebCore |
176 | 186 |
177 #endif // RenderMultiColumnSet_h | 187 #endif // RenderMultiColumnSet_h |
178 | 188 |
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