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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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90 remainingLogicalHeight = intMod(remainingLogicalHeight, pageLogicalHeigh
t); | 90 remainingLogicalHeight = intMod(remainingLogicalHeight, pageLogicalHeigh
t); |
91 } | 91 } |
92 return remainingLogicalHeight; | 92 return remainingLogicalHeight; |
93 } | 93 } |
94 | 94 |
95 bool LayoutMultiColumnSet::isPageLogicalHeightKnown() const | 95 bool LayoutMultiColumnSet::isPageLogicalHeightKnown() const |
96 { | 96 { |
97 return firstFragmentainerGroup().logicalHeight(); | 97 return firstFragmentainerGroup().logicalHeight(); |
98 } | 98 } |
99 | 99 |
| 100 LayoutUnit LayoutMultiColumnSet::nextLogicalTopForUnbreakableContent(LayoutUnit
flowThreadOffset, LayoutUnit contentLogicalHeight) const |
| 101 { |
| 102 ASSERT(pageLogicalTopForOffset(flowThreadOffset) == flowThreadOffset); |
| 103 LayoutMultiColumnFlowThread* enclosingFlowThread = multiColumnFlowThread()->
enclosingFlowThread(); |
| 104 if (!enclosingFlowThread) { |
| 105 // If there's no enclosing fragmentation context, there'll ever be only
one row, and all |
| 106 // columns there will have the same height. |
| 107 return flowThreadOffset; |
| 108 } |
| 109 |
| 110 // Assert the problematic situation. If we have no problem with the column h
eight, why are we |
| 111 // even here? |
| 112 ASSERT(pageLogicalHeightForOffset(flowThreadOffset) < contentLogicalHeight); |
| 113 |
| 114 // There's a likelihood for subsequent rows to be taller than the first one. |
| 115 // TODO(mstensho): if we're doubly nested (e.g. multicol in multicol in mult
icol), we need to |
| 116 // look beyond the first row here. |
| 117 const MultiColumnFragmentainerGroup& firstRow = firstFragmentainerGroup(); |
| 118 LayoutUnit firstRowLogicalBottomInFlowThread = firstRow.logicalTopInFlowThre
ad() + firstRow.logicalHeight() * usedColumnCount(); |
| 119 if (flowThreadOffset >= firstRowLogicalBottomInFlowThread) |
| 120 return flowThreadOffset; // We're not in the first row. Give up. |
| 121 LayoutUnit newLogicalHeight = enclosingFlowThread->pageLogicalHeightForOffse
t(firstRowLogicalBottomInFlowThread); |
| 122 if (contentLogicalHeight > newLogicalHeight) { |
| 123 // The next outer column or page doesn't have enough space either. Give
up and stay where |
| 124 // we are. |
| 125 return flowThreadOffset; |
| 126 } |
| 127 return firstRowLogicalBottomInFlowThread; |
| 128 } |
| 129 |
100 LayoutMultiColumnSet* LayoutMultiColumnSet::nextSiblingMultiColumnSet() const | 130 LayoutMultiColumnSet* LayoutMultiColumnSet::nextSiblingMultiColumnSet() const |
101 { | 131 { |
102 for (LayoutObject* sibling = nextSibling(); sibling; sibling = sibling->next
Sibling()) { | 132 for (LayoutObject* sibling = nextSibling(); sibling; sibling = sibling->next
Sibling()) { |
103 if (sibling->isLayoutMultiColumnSet()) | 133 if (sibling->isLayoutMultiColumnSet()) |
104 return toLayoutMultiColumnSet(sibling); | 134 return toLayoutMultiColumnSet(sibling); |
105 } | 135 } |
106 return nullptr; | 136 return nullptr; |
107 } | 137 } |
108 | 138 |
109 LayoutMultiColumnSet* LayoutMultiColumnSet::previousSiblingMultiColumnSet() cons
t | 139 LayoutMultiColumnSet* LayoutMultiColumnSet::previousSiblingMultiColumnSet() cons
t |
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350 | 380 |
351 LayoutRect LayoutMultiColumnSet::flowThreadPortionRect() const | 381 LayoutRect LayoutMultiColumnSet::flowThreadPortionRect() const |
352 { | 382 { |
353 LayoutRect portionRect(LayoutUnit(), logicalTopInFlowThread(), pageLogicalWi
dth(), logicalHeightInFlowThread()); | 383 LayoutRect portionRect(LayoutUnit(), logicalTopInFlowThread(), pageLogicalWi
dth(), logicalHeightInFlowThread()); |
354 if (!isHorizontalWritingMode()) | 384 if (!isHorizontalWritingMode()) |
355 return portionRect.transposedRect(); | 385 return portionRect.transposedRect(); |
356 return portionRect; | 386 return portionRect; |
357 } | 387 } |
358 | 388 |
359 } | 389 } |
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