1 | /* |
2 | * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
3 | * (C) 1999 Antti Koivisto (koivisto@kde.org) |
4 | * (C) 2007 David Smith (catfish.man@gmail.com) |
5 | * Copyright (C) 2003-2013, Apple Inc. All rights reserved. |
6 | * |
7 | * This library is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Library General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2 of the License, or (at your option) any later version. |
11 | * |
12 | * This library is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Library General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Library General Public License |
18 | * along with this library; see the file COPYING.LIB. If not, write to |
19 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | * Boston, MA 02110-1301, USA. |
21 | */ |
22 | |
23 | #pragma once |
24 | |
25 | #include "FloatingObjects.h" |
26 | #include "LineWidth.h" |
27 | #include "RenderBlock.h" |
28 | #include "RenderLineBoxList.h" |
29 | #include "SimpleLineLayout.h" |
30 | #include "TrailingObjects.h" |
31 | #include <memory> |
32 | |
33 | namespace WebCore { |
34 | |
35 | class FloatWithRect; |
36 | class LineBreaker; |
37 | class LineInfo; |
38 | class RenderMultiColumnFlow; |
39 | class RenderRubyRun; |
40 | |
41 | struct WordMeasurement; |
42 | |
43 | template <class Run> class BidiRunList; |
44 | typedef Vector<WordMeasurement, 64> WordMeasurements; |
45 | |
46 | #if ENABLE(TEXT_AUTOSIZING) |
47 | enum LineCount { |
48 | NOT_SET = 0, NO_LINE = 1, ONE_LINE = 2, MULTI_LINE = 3 |
49 | }; |
50 | #endif |
51 | |
52 | class RenderBlockFlow : public RenderBlock { |
53 | WTF_MAKE_ISO_ALLOCATED(RenderBlockFlow); |
54 | public: |
55 | RenderBlockFlow(Element&, RenderStyle&&); |
56 | RenderBlockFlow(Document&, RenderStyle&&); |
57 | virtual ~RenderBlockFlow(); |
58 | |
59 | void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0_lu) override; |
60 | |
61 | protected: |
62 | void willBeDestroyed() override; |
63 | |
64 | // This method is called at the start of layout to wipe away all of the floats in our floating objects list. It also |
65 | // repopulates the list with any floats that intrude from previous siblings or parents. Floats that were added by |
66 | // descendants are gone when this call completes and will get added back later on after the children have gotten |
67 | // a relayout. |
68 | void rebuildFloatingObjectSetFromIntrudingFloats(); |
69 | |
70 | // RenderBlockFlow always contains either lines or paragraphs. When the children are all blocks (e.g. paragraphs), we call layoutBlockChildren. |
71 | // When the children are all inline (e.g., lines), we call layoutInlineChildren. |
72 | void layoutBlockChildren(bool relayoutChildren, LayoutUnit& maxFloatLogicalBottom); |
73 | void layoutInlineChildren(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom); |
74 | |
75 | // RenderBlockFlows override these methods, since they are the only class that supports margin collapsing. |
76 | LayoutUnit collapsedMarginBefore() const final { return maxPositiveMarginBefore() - maxNegativeMarginBefore(); } |
77 | LayoutUnit collapsedMarginAfter() const final { return maxPositiveMarginAfter() - maxNegativeMarginAfter(); } |
78 | |
79 | void dirtyLinesFromChangedChild(RenderObject& child) final { lineBoxes().dirtyLinesFromChangedChild(*this, child); } |
80 | |
81 | void paintColumnRules(PaintInfo&, const LayoutPoint&) override; |
82 | |
83 | public: |
84 | class MarginValues { |
85 | public: |
86 | MarginValues(LayoutUnit beforePos, LayoutUnit beforeNeg, LayoutUnit afterPos, LayoutUnit afterNeg) |
87 | : m_positiveMarginBefore(beforePos) |
88 | , m_negativeMarginBefore(beforeNeg) |
89 | , m_positiveMarginAfter(afterPos) |
90 | , m_negativeMarginAfter(afterNeg) |
91 | { |
92 | } |
93 | |
94 | LayoutUnit positiveMarginBefore() const { return m_positiveMarginBefore; } |
95 | LayoutUnit negativeMarginBefore() const { return m_negativeMarginBefore; } |
96 | LayoutUnit positiveMarginAfter() const { return m_positiveMarginAfter; } |
97 | LayoutUnit negativeMarginAfter() const { return m_negativeMarginAfter; } |
98 | |
99 | void setPositiveMarginBefore(LayoutUnit pos) { m_positiveMarginBefore = pos; } |
100 | void setNegativeMarginBefore(LayoutUnit neg) { m_negativeMarginBefore = neg; } |
101 | void setPositiveMarginAfter(LayoutUnit pos) { m_positiveMarginAfter = pos; } |
102 | void setNegativeMarginAfter(LayoutUnit neg) { m_negativeMarginAfter = neg; } |
103 | |
104 | private: |
105 | LayoutUnit m_positiveMarginBefore; |
106 | LayoutUnit m_negativeMarginBefore; |
107 | LayoutUnit m_positiveMarginAfter; |
108 | LayoutUnit m_negativeMarginAfter; |
109 | }; |
110 | MarginValues marginValuesForChild(RenderBox& child) const; |
111 | |
112 | // Allocated only when some of these fields have non-default values |
113 | struct RenderBlockFlowRareData { |
114 | WTF_MAKE_NONCOPYABLE(RenderBlockFlowRareData); WTF_MAKE_FAST_ALLOCATED; |
115 | public: |
116 | RenderBlockFlowRareData(const RenderBlockFlow& block) |
117 | : m_margins(positiveMarginBeforeDefault(block), negativeMarginBeforeDefault(block), positiveMarginAfterDefault(block), negativeMarginAfterDefault(block)) |
118 | , m_lineBreakToAvoidWidow(-1) |
119 | , m_discardMarginBefore(false) |
120 | , m_discardMarginAfter(false) |
121 | , m_didBreakAtLineToAvoidWidow(false) |
122 | { |
123 | } |
124 | |
125 | static LayoutUnit positiveMarginBeforeDefault(const RenderBlock& block) |
126 | { |
127 | return std::max<LayoutUnit>(block.marginBefore(), 0); |
128 | } |
129 | static LayoutUnit negativeMarginBeforeDefault(const RenderBlock& block) |
130 | { |
131 | return std::max<LayoutUnit>(-block.marginBefore(), 0); |
132 | } |
133 | static LayoutUnit positiveMarginAfterDefault(const RenderBlock& block) |
134 | { |
135 | return std::max<LayoutUnit>(block.marginAfter(), 0); |
136 | } |
137 | static LayoutUnit negativeMarginAfterDefault(const RenderBlock& block) |
138 | { |
139 | return std::max<LayoutUnit>(-block.marginAfter(), 0); |
140 | } |
141 | |
142 | MarginValues m_margins; |
143 | int m_lineBreakToAvoidWidow; |
144 | std::unique_ptr<RootInlineBox> m_lineGridBox; |
145 | |
146 | WeakPtr<RenderMultiColumnFlow> m_multiColumnFlow; |
147 | |
148 | bool m_discardMarginBefore : 1; |
149 | bool m_discardMarginAfter : 1; |
150 | bool m_didBreakAtLineToAvoidWidow : 1; |
151 | }; |
152 | |
153 | class MarginInfo { |
154 | // Collapsing flags for whether we can collapse our margins with our children's margins. |
155 | bool m_canCollapseWithChildren : 1; |
156 | bool m_canCollapseMarginBeforeWithChildren : 1; |
157 | bool m_canCollapseMarginAfterWithChildren : 1; |
158 | |
159 | // Whether or not we are a quirky container, i.e., do we collapse away top and bottom |
160 | // margins in our container. Table cells and the body are the common examples. We |
161 | // also have a custom style property for Safari RSS to deal with TypePad blog articles. |
162 | bool m_quirkContainer : 1; |
163 | |
164 | // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block. |
165 | // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will |
166 | // always be collapsing with one another. This variable can remain set to true through multiple iterations |
167 | // as long as we keep encountering self-collapsing blocks. |
168 | bool m_atBeforeSideOfBlock : 1; |
169 | |
170 | // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block. |
171 | bool m_atAfterSideOfBlock : 1; |
172 | |
173 | // These variables are used to detect quirky margins that we need to collapse away (in table cells |
174 | // and in the body element). |
175 | bool m_hasMarginBeforeQuirk : 1; |
176 | bool m_hasMarginAfterQuirk : 1; |
177 | bool m_determinedMarginBeforeQuirk : 1; |
178 | |
179 | bool m_discardMargin : 1; |
180 | |
181 | // These flags track the previous maximal positive and negative margins. |
182 | LayoutUnit m_positiveMargin; |
183 | LayoutUnit m_negativeMargin; |
184 | |
185 | public: |
186 | MarginInfo(const RenderBlockFlow&, LayoutUnit beforeBorderPadding, LayoutUnit afterBorderPadding); |
187 | |
188 | void setAtBeforeSideOfBlock(bool b) { m_atBeforeSideOfBlock = b; } |
189 | void setAtAfterSideOfBlock(bool b) { m_atAfterSideOfBlock = b; } |
190 | void clearMargin() |
191 | { |
192 | m_positiveMargin = 0; |
193 | m_negativeMargin = 0; |
194 | } |
195 | void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; } |
196 | void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; } |
197 | void setDeterminedMarginBeforeQuirk(bool b) { m_determinedMarginBeforeQuirk = b; } |
198 | void setPositiveMargin(LayoutUnit p) { ASSERT(!m_discardMargin); m_positiveMargin = p; } |
199 | void setNegativeMargin(LayoutUnit n) { ASSERT(!m_discardMargin); m_negativeMargin = n; } |
200 | void setPositiveMarginIfLarger(LayoutUnit p) |
201 | { |
202 | ASSERT(!m_discardMargin); |
203 | if (p > m_positiveMargin) |
204 | m_positiveMargin = p; |
205 | } |
206 | void setNegativeMarginIfLarger(LayoutUnit n) |
207 | { |
208 | ASSERT(!m_discardMargin); |
209 | if (n > m_negativeMargin) |
210 | m_negativeMargin = n; |
211 | } |
212 | |
213 | void setMargin(LayoutUnit p, LayoutUnit n) { ASSERT(!m_discardMargin); m_positiveMargin = p; m_negativeMargin = n; } |
214 | void setCanCollapseMarginAfterWithChildren(bool collapse) { m_canCollapseMarginAfterWithChildren = collapse; } |
215 | void setDiscardMargin(bool value) { m_discardMargin = value; } |
216 | |
217 | bool atBeforeSideOfBlock() const { return m_atBeforeSideOfBlock; } |
218 | bool canCollapseWithMarginBefore() const { return m_atBeforeSideOfBlock && m_canCollapseMarginBeforeWithChildren; } |
219 | bool canCollapseWithMarginAfter() const { return m_atAfterSideOfBlock && m_canCollapseMarginAfterWithChildren; } |
220 | bool canCollapseMarginBeforeWithChildren() const { return m_canCollapseMarginBeforeWithChildren; } |
221 | bool canCollapseMarginAfterWithChildren() const { return m_canCollapseMarginAfterWithChildren; } |
222 | bool quirkContainer() const { return m_quirkContainer; } |
223 | bool determinedMarginBeforeQuirk() const { return m_determinedMarginBeforeQuirk; } |
224 | bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; } |
225 | bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; } |
226 | LayoutUnit positiveMargin() const { return m_positiveMargin; } |
227 | LayoutUnit negativeMargin() const { return m_negativeMargin; } |
228 | bool discardMargin() const { return m_discardMargin; } |
229 | LayoutUnit margin() const { return m_positiveMargin - m_negativeMargin; } |
230 | }; |
231 | LayoutUnit marginOffsetForSelfCollapsingBlock(); |
232 | |
233 | void layoutBlockChild(RenderBox& child, MarginInfo&, LayoutUnit& previousFloatLogicalBottom, LayoutUnit& maxFloatLogicalBottom); |
234 | void adjustPositionedBlock(RenderBox& child, const MarginInfo&); |
235 | void adjustFloatingBlock(const MarginInfo&); |
236 | |
237 | void setStaticInlinePositionForChild(RenderBox& child, LayoutUnit blockOffset, LayoutUnit inlinePosition); |
238 | void updateStaticInlinePositionForChild(RenderBox& child, LayoutUnit logicalTop, IndentTextOrNot shouldIndentText); |
239 | |
240 | LayoutUnit collapseMargins(RenderBox& child, MarginInfo&); |
241 | LayoutUnit collapseMarginsWithChildInfo(RenderBox* child, RenderObject* prevSibling, MarginInfo&); |
242 | |
243 | LayoutUnit clearFloatsIfNeeded(RenderBox& child, MarginInfo&, LayoutUnit oldTopPosMargin, LayoutUnit oldTopNegMargin, LayoutUnit yPos); |
244 | LayoutUnit estimateLogicalTopPosition(RenderBox& child, const MarginInfo&, LayoutUnit& ); |
245 | void marginBeforeEstimateForChild(RenderBox&, LayoutUnit&, LayoutUnit&, bool&) const; |
246 | void handleAfterSideOfBlock(LayoutUnit top, LayoutUnit bottom, MarginInfo&); |
247 | void setCollapsedBottomMargin(const MarginInfo&); |
248 | |
249 | bool childrenPreventSelfCollapsing() const final; |
250 | |
251 | bool shouldBreakAtLineToAvoidWidow() const { return hasRareBlockFlowData() && rareBlockFlowData()->m_lineBreakToAvoidWidow >= 0; } |
252 | void clearShouldBreakAtLineToAvoidWidow() const; |
253 | int lineBreakToAvoidWidow() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_lineBreakToAvoidWidow : -1; } |
254 | void setBreakAtLineToAvoidWidow(int); |
255 | void clearDidBreakAtLineToAvoidWidow(); |
256 | void setDidBreakAtLineToAvoidWidow(); |
257 | bool didBreakAtLineToAvoidWidow() const { return hasRareBlockFlowData() && rareBlockFlowData()->m_didBreakAtLineToAvoidWidow; } |
258 | bool relayoutToAvoidWidows(); |
259 | |
260 | RootInlineBox* lineGridBox() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_lineGridBox.get() : nullptr; } |
261 | void setLineGridBox(std::unique_ptr<RootInlineBox> box) |
262 | { |
263 | ensureRareBlockFlowData().m_lineGridBox = WTFMove(box); |
264 | } |
265 | void layoutLineGridBox(); |
266 | |
267 | RenderMultiColumnFlow* multiColumnFlow() const { return hasRareBlockFlowData() ? multiColumnFlowSlowCase() : nullptr; } |
268 | RenderMultiColumnFlow* multiColumnFlowSlowCase() const; |
269 | void setMultiColumnFlow(RenderMultiColumnFlow&); |
270 | void clearMultiColumnFlow(); |
271 | bool willCreateColumns(Optional<unsigned> desiredColumnCount = WTF::nullopt) const; |
272 | virtual bool requiresColumns(int) const; |
273 | |
274 | bool containsFloats() const override { return m_floatingObjects && !m_floatingObjects->set().isEmpty(); } |
275 | bool containsFloat(RenderBox&) const; |
276 | |
277 | void deleteLines() override; |
278 | void computeOverflow(LayoutUnit oldClientAfterEdge, bool recomputeFloats = false) override; |
279 | Position positionForPoint(const LayoutPoint&) override; |
280 | VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override; |
281 | |
282 | LayoutUnit lowestFloatLogicalBottom(FloatingObject::Type = FloatingObject::FloatLeftRight) const; |
283 | |
284 | void removeFloatingObjects(); |
285 | void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = nullptr, bool inLayout = true); |
286 | void markSiblingsWithFloatsForLayout(RenderBox* floatToRemove = nullptr); |
287 | |
288 | const FloatingObjectSet* floatingObjectSet() const { return m_floatingObjects ? &m_floatingObjects->set() : nullptr; } |
289 | |
290 | LayoutUnit logicalTopForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.y() : floatingObject.x(); } |
291 | LayoutUnit logicalBottomForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.maxY() : floatingObject.maxX(); } |
292 | LayoutUnit logicalLeftForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.x() : floatingObject.y(); } |
293 | LayoutUnit logicalRightForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.maxX() : floatingObject.maxY(); } |
294 | LayoutUnit logicalWidthForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.width() : floatingObject.height(); } |
295 | LayoutUnit logicalHeightForFloat(const FloatingObject& floatingObject) const { return isHorizontalWritingMode() ? floatingObject.height() : floatingObject.width(); } |
296 | |
297 | void setLogicalTopForFloat(FloatingObject& floatingObject, LayoutUnit logicalTop) |
298 | { |
299 | if (isHorizontalWritingMode()) |
300 | floatingObject.setY(logicalTop); |
301 | else |
302 | floatingObject.setX(logicalTop); |
303 | } |
304 | void setLogicalLeftForFloat(FloatingObject& floatingObject, LayoutUnit logicalLeft) |
305 | { |
306 | if (isHorizontalWritingMode()) |
307 | floatingObject.setX(logicalLeft); |
308 | else |
309 | floatingObject.setY(logicalLeft); |
310 | } |
311 | void setLogicalHeightForFloat(FloatingObject& floatingObject, LayoutUnit logicalHeight) |
312 | { |
313 | if (isHorizontalWritingMode()) |
314 | floatingObject.setHeight(logicalHeight); |
315 | else |
316 | floatingObject.setWidth(logicalHeight); |
317 | } |
318 | void setLogicalWidthForFloat(FloatingObject& floatingObject, LayoutUnit logicalWidth) |
319 | { |
320 | if (isHorizontalWritingMode()) |
321 | floatingObject.setWidth(logicalWidth); |
322 | else |
323 | floatingObject.setHeight(logicalWidth); |
324 | } |
325 | void setLogicalMarginsForFloat(FloatingObject& floatingObject, LayoutUnit logicalLeftMargin, LayoutUnit logicalBeforeMargin) |
326 | { |
327 | if (isHorizontalWritingMode()) |
328 | floatingObject.setMarginOffset(LayoutSize(logicalLeftMargin, logicalBeforeMargin)); |
329 | else |
330 | floatingObject.setMarginOffset(LayoutSize(logicalBeforeMargin, logicalLeftMargin)); |
331 | } |
332 | |
333 | LayoutPoint flipFloatForWritingModeForChild(const FloatingObject&, const LayoutPoint&) const; |
334 | |
335 | RenderLineBoxList& lineBoxes() { return m_lineBoxes; } |
336 | const RenderLineBoxList& lineBoxes() const { return m_lineBoxes; } |
337 | |
338 | RootInlineBox* firstRootBox() const { return downcast<RootInlineBox>(m_lineBoxes.firstLineBox()); } |
339 | RootInlineBox* lastRootBox() const { return downcast<RootInlineBox>(m_lineBoxes.lastLineBox()); } |
340 | |
341 | bool hasLines() const; |
342 | void invalidateLineLayoutPath() final; |
343 | |
344 | enum LineLayoutPath { UndeterminedPath = 0, SimpleLinesPath, LineBoxesPath, ForceLineBoxesPath }; |
345 | LineLayoutPath lineLayoutPath() const { return static_cast<LineLayoutPath>(renderBlockFlowLineLayoutPath()); } |
346 | void setLineLayoutPath(LineLayoutPath path) { setRenderBlockFlowLineLayoutPath(path); } |
347 | |
348 | // Helper methods for computing line counts and heights for line counts. |
349 | RootInlineBox* lineAtIndex(int) const; |
350 | int lineCount(const RootInlineBox* = nullptr, bool* = nullptr) const; |
351 | int heightForLineCount(int); |
352 | void clearTruncation(); |
353 | |
354 | void setHasMarkupTruncation(bool b) { setRenderBlockFlowHasMarkupTruncation(b); } |
355 | bool hasMarkupTruncation() const { return renderBlockFlowHasMarkupTruncation(); } |
356 | |
357 | bool containsNonZeroBidiLevel() const; |
358 | |
359 | const SimpleLineLayout::Layout* simpleLineLayout() const; |
360 | void deleteLineBoxesBeforeSimpleLineLayout(); |
361 | void ensureLineBoxes(); |
362 | void generateLineBoxTree(); |
363 | |
364 | #if ENABLE(TREE_DEBUGGING) |
365 | void outputLineTreeAndMark(WTF::TextStream&, const InlineBox* markedBox, int depth) const; |
366 | #endif |
367 | |
368 | // Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page, |
369 | // then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with |
370 | // IncludePageBoundary set will not. |
371 | // |
372 | // For a page height of 800px, the first rule will return 800 if the value passed in is 0. The second rule will simply return 0. |
373 | enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary }; |
374 | LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const; |
375 | LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const; |
376 | LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const; |
377 | LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const; |
378 | LayoutUnit logicalHeightForChildForFragmentation(const RenderBox& child) const; |
379 | bool hasNextPage(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const; |
380 | |
381 | void updateColumnProgressionFromStyle(RenderStyle&); |
382 | void updateStylesForColumnChildren(); |
383 | |
384 | bool needsLayoutAfterFragmentRangeChange() const override; |
385 | WEBCORE_EXPORT RenderText* findClosestTextAtAbsolutePoint(const FloatPoint&); |
386 | |
387 | // A page break is required at some offset due to space shortage in the current fragmentainer. |
388 | void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage); |
389 | // Update minimum page height required to avoid fragmentation where it shouldn't occur (inside |
390 | // unbreakable content, between orphans and widows, etc.). This will be used as a hint to the |
391 | // column balancer to help set a good minimum column height. |
392 | void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight); |
393 | |
394 | void addFloatsToNewParent(RenderBlockFlow& toBlockFlow) const; |
395 | |
396 | protected: |
397 | void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override; |
398 | |
399 | bool pushToNextPageWithMinimumLogicalHeight(LayoutUnit& adjustment, LayoutUnit logicalOffset, LayoutUnit minimumLogicalHeight) const; |
400 | |
401 | // If the child is unsplittable and can't fit on the current page, return the top of the next page/column. |
402 | LayoutUnit adjustForUnsplittableChild(RenderBox& child, LayoutUnit logicalOffset, LayoutUnit beforeMargin = 0_lu, LayoutUnit afterMargin = 0_lu); |
403 | LayoutUnit (LayoutUnit logicalTopAfterClear, LayoutUnit , RenderBox& child, bool atBeforeSideOfBlock); |
404 | LayoutUnit applyBeforeBreak(RenderBox& child, LayoutUnit logicalOffset); // If the child has a before break, then return a new yPos that shifts to the top of the next page/column. |
405 | LayoutUnit applyAfterBreak(RenderBox& child, LayoutUnit logicalOffset, MarginInfo&); // If the child has an after break, then return a new offset that shifts to the top of the next page/column. |
406 | |
407 | LayoutUnit maxPositiveMarginBefore() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.positiveMarginBefore() : RenderBlockFlowRareData::positiveMarginBeforeDefault(*this); } |
408 | LayoutUnit maxNegativeMarginBefore() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.negativeMarginBefore() : RenderBlockFlowRareData::negativeMarginBeforeDefault(*this); } |
409 | LayoutUnit maxPositiveMarginAfter() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.positiveMarginAfter() : RenderBlockFlowRareData::positiveMarginAfterDefault(*this); } |
410 | LayoutUnit maxNegativeMarginAfter() const { return hasRareBlockFlowData() ? rareBlockFlowData()->m_margins.negativeMarginAfter() : RenderBlockFlowRareData::negativeMarginAfterDefault(*this); } |
411 | |
412 | void initMaxMarginValues() |
413 | { |
414 | if (!hasRareBlockFlowData()) |
415 | return; |
416 | |
417 | rareBlockFlowData()->m_margins = MarginValues(RenderBlockFlowRareData::positiveMarginBeforeDefault(*this) , RenderBlockFlowRareData::negativeMarginBeforeDefault(*this), |
418 | RenderBlockFlowRareData::positiveMarginAfterDefault(*this), RenderBlockFlowRareData::negativeMarginAfterDefault(*this)); |
419 | rareBlockFlowData()->m_discardMarginBefore = false; |
420 | rareBlockFlowData()->m_discardMarginAfter = false; |
421 | } |
422 | |
423 | void setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg); |
424 | void setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg); |
425 | |
426 | void setMustDiscardMarginBefore(bool = true); |
427 | void setMustDiscardMarginAfter(bool = true); |
428 | |
429 | bool mustDiscardMarginBefore() const; |
430 | bool mustDiscardMarginAfter() const; |
431 | |
432 | bool mustDiscardMarginBeforeForChild(const RenderBox&) const; |
433 | bool mustDiscardMarginAfterForChild(const RenderBox&) const; |
434 | bool mustSeparateMarginBeforeForChild(const RenderBox&) const; |
435 | bool mustSeparateMarginAfterForChild(const RenderBox&) const; |
436 | |
437 | void styleWillChange(StyleDifference, const RenderStyle& newStyle) override; |
438 | void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; |
439 | |
440 | void createFloatingObjects(); |
441 | |
442 | Optional<int> firstLineBaseline() const override; |
443 | Optional<int> inlineBlockBaseline(LineDirectionMode) const override; |
444 | |
445 | bool isMultiColumnBlockFlow() const override { return multiColumnFlow(); } |
446 | |
447 | void setComputedColumnCountAndWidth(int, LayoutUnit); |
448 | |
449 | LayoutUnit computedColumnWidth() const; |
450 | unsigned computedColumnCount() const; |
451 | |
452 | bool isTopLayoutOverflowAllowed() const override; |
453 | bool isLeftLayoutOverflowAllowed() const override; |
454 | |
455 | virtual void computeColumnCountAndWidth(); |
456 | |
457 | virtual void cachePriorCharactersIfNeeded(const LazyLineBreakIterator&) {}; |
458 | |
459 | protected: |
460 | // Called to lay out the legend for a fieldset or the ruby text of a ruby run. Also used by multi-column layout to handle |
461 | // the flow thread child. |
462 | void layoutExcludedChildren(bool relayoutChildren) override; |
463 | void addOverflowFromFloats(); |
464 | |
465 | private: |
466 | bool recomputeLogicalWidthAndColumnWidth(); |
467 | LayoutUnit columnGap() const; |
468 | |
469 | RenderBlockFlow* previousSiblingWithOverhangingFloats(bool& parentHasFloats) const; |
470 | |
471 | void (bool& relayoutChildren, LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged); |
472 | |
473 | void paintInlineChildren(PaintInfo&, const LayoutPoint&) override; |
474 | void paintFloats(PaintInfo&, const LayoutPoint&, bool preservePhase = false) override; |
475 | |
476 | void repaintOverhangingFloats(bool paintAllDescendants) final; |
477 | void clipOutFloatingObjects(RenderBlock&, const PaintInfo*, const LayoutPoint&, const LayoutSize&) override; |
478 | |
479 | FloatingObject* insertFloatingObject(RenderBox&); |
480 | void removeFloatingObject(RenderBox&); |
481 | void removeFloatingObjectsBelow(FloatingObject*, int logicalOffset); |
482 | void computeLogicalLocationForFloat(FloatingObject&, LayoutUnit& logicalTopOffset); |
483 | |
484 | // Called from lineWidth, to position the floats added in the last line. |
485 | // Returns true if and only if it has positioned any floats. |
486 | bool positionNewFloats(); |
487 | |
488 | void clearFloats(Clear); |
489 | |
490 | LayoutUnit logicalRightFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const override; |
491 | LayoutUnit logicalLeftFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const override; |
492 | |
493 | LayoutUnit logicalRightOffsetForPositioningFloat(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining) const; |
494 | LayoutUnit logicalLeftOffsetForPositioningFloat(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining) const; |
495 | |
496 | LayoutUnit lowestInitialLetterLogicalBottom() const; |
497 | |
498 | LayoutUnit nextFloatLogicalBottomBelow(LayoutUnit) const; |
499 | LayoutUnit nextFloatLogicalBottomBelowForBlock(LayoutUnit) const; |
500 | |
501 | LayoutUnit addOverhangingFloats(RenderBlockFlow& child, bool makeChildPaintOtherFloats); |
502 | bool hasOverhangingFloat(RenderBox&); |
503 | void addIntrudingFloats(RenderBlockFlow* prev, RenderBlockFlow* container, LayoutUnit xoffset, LayoutUnit yoffset); |
504 | bool hasOverhangingFloats() { return parent() && containsFloats() && lowestFloatLogicalBottom() > logicalHeight(); } |
505 | LayoutUnit getClearDelta(RenderBox& child, LayoutUnit yPos); |
506 | |
507 | void determineLogicalLeftPositionForChild(RenderBox& child, ApplyLayoutDeltaMode = DoNotApplyLayoutDelta); |
508 | |
509 | bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) override; |
510 | bool hitTestInlineChildren(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override; |
511 | |
512 | void addOverflowFromInlineChildren() override; |
513 | |
514 | void fitBorderToLinesIfNeeded(); // Shrink the box in which the border paints if border-fit is set. |
515 | void adjustForBorderFit(LayoutUnit x, LayoutUnit& left, LayoutUnit& right) const; |
516 | |
517 | void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0); |
518 | |
519 | GapRects inlineSelectionGaps(RenderBlock& rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock, |
520 | LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const LogicalSelectionOffsetCaches&, const PaintInfo*) override; |
521 | |
522 | Position positionForBox(InlineBox*, bool start = true) const; |
523 | VisiblePosition positionForPointWithInlineChildren(const LayoutPoint& pointInLogicalContents, const RenderFragmentContainer*) override; |
524 | void addFocusRingRectsForInlineChildren(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*) override; |
525 | |
526 | // FIXME-BLOCKFLOW: These methods have implementations in |
527 | // RenderBlockLineLayout. They should be moved to the proper header once the |
528 | // line layout code is separated from RenderBlock and RenderBlockFlow. |
529 | // START METHODS DEFINED IN RenderBlockLineLayout |
530 | public: |
531 | static void appendRunsForObject(BidiRunList<BidiRun>*, int start, int end, RenderObject&, InlineBidiResolver&); |
532 | RootInlineBox* createAndAppendRootInlineBox(); |
533 | |
534 | LayoutUnit startAlignedOffsetForLine(LayoutUnit position, IndentTextOrNot shouldIndentText); |
535 | virtual TextAlignMode textAlignmentForLine(bool endsWithSoftBreak) const; |
536 | virtual void adjustInlineDirectionLineBounds(int /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { } |
537 | RootInlineBox* constructLine(BidiRunList<BidiRun>&, const LineInfo&); |
538 | |
539 | private: |
540 | void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const; |
541 | |
542 | void layoutLineBoxes(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom); |
543 | void layoutSimpleLines(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom); |
544 | |
545 | virtual std::unique_ptr<RootInlineBox> createRootInlineBox(); // Subclassed by RenderSVGText. |
546 | InlineFlowBox* createLineBoxes(RenderObject*, const LineInfo&, InlineBox* childBox); |
547 | void setMarginsForRubyRun(BidiRun*, RenderRubyRun&, RenderObject*, const LineInfo&); |
548 | void computeInlineDirectionPositionsForLine(RootInlineBox*, const LineInfo&, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd, GlyphOverflowAndFallbackFontsMap&, VerticalPositionCache&, WordMeasurements&); |
549 | void updateRubyForJustifiedText(RenderRubyRun&, BidiRun&, const Vector<unsigned, 16>& expansionOpportunities, unsigned& expansionOpportunityCount, float& totalLogicalWidth, float availableLogicalWidth, size_t& expansionIndex); |
550 | void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, const Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, float totalLogicalWidth, float availableLogicalWidth); |
551 | BidiRun* computeInlineDirectionPositionsForSegment(RootInlineBox*, const LineInfo&, TextAlignMode, float& logicalLeft, |
552 | float& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache&, WordMeasurements&); |
553 | void computeBlockDirectionPositionsForLine(RootInlineBox*, BidiRun*, GlyphOverflowAndFallbackFontsMap&, VerticalPositionCache&); |
554 | BidiRun* handleTrailingSpaces(BidiRunList<BidiRun>&, BidiContext*); |
555 | void appendFloatingObjectToLastLine(FloatingObject&); |
556 | // Helper function for layoutInlineChildren() |
557 | RootInlineBox* createLineBoxesFromBidiRuns(unsigned bidiLevel, BidiRunList<BidiRun>&, const InlineIterator& end, LineInfo&, VerticalPositionCache&, BidiRun* trailingSpaceRun, WordMeasurements&); |
558 | void layoutRunsAndFloats(LineLayoutState&, bool hasInlineChild); |
559 | const InlineIterator& restartLayoutRunsAndFloatsInRange(LayoutUnit oldLogicalHeight, LayoutUnit newLogicalHeight, FloatingObject* lastFloatFromPreviousLine, InlineBidiResolver&, const InlineIterator&); |
560 | void layoutRunsAndFloatsInRange(LineLayoutState&, InlineBidiResolver&, const InlineIterator& cleanLineStart, const BidiStatus& cleanLineBidiStatus, unsigned consecutiveHyphenatedLines); |
561 | void reattachCleanLineFloats(RootInlineBox& cleanLine, LayoutUnit delta, bool isFirstCleanLine); |
562 | void linkToEndLineIfNeeded(LineLayoutState&); |
563 | void checkFloatInCleanLine(RootInlineBox& cleanLine, RenderBox& floatBoxOnCleanLine, FloatWithRect& matchingFloatWithRect, |
564 | bool& encounteredNewFloat, bool& dirtiedByFloat); |
565 | RootInlineBox* determineStartPosition(LineLayoutState&, InlineBidiResolver&); |
566 | void determineEndPosition(LineLayoutState&, RootInlineBox* startBox, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus); |
567 | bool checkPaginationAndFloatsAtEndLine(LineLayoutState&); |
568 | bool matchedEndLine(LineLayoutState&, const InlineBidiResolver&, const InlineIterator& endLineStart, const BidiStatus& endLineStatus); |
569 | void deleteEllipsisLineBoxes(); |
570 | void checkLinesForTextOverflow(); |
571 | // Positions new floats and also adjust all floats encountered on the line if any of them |
572 | // have to move to the next page/column. |
573 | bool positionNewFloatOnLine(const FloatingObject& newFloat, FloatingObject* lastFloatFromPreviousLine, LineInfo&, LineWidth&); |
574 | // This function is called to test a line box that has moved in the block direction to see if it has ended up in a new |
575 | // page/column that has a different available line width than the old one. Used to know when you have to dirty a |
576 | // line, i.e., that it can't be re-used. |
577 | bool lineWidthForPaginatedLineChanged(RootInlineBox*, LayoutUnit lineDelta, RenderFragmentedFlow*) const; |
578 | void updateLogicalWidthForAlignment(const TextAlignMode&, const RootInlineBox*, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float& availableLogicalWidth, int expansionOpportunityCount); |
579 | // END METHODS DEFINED IN RenderBlockLineLayout |
580 | |
581 | void computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const; |
582 | |
583 | void adjustInitialLetterPosition(RenderBox& childBox, LayoutUnit& logicalTopOffset, LayoutUnit& marginBeforeOffset); |
584 | |
585 | #if ENABLE(TEXT_AUTOSIZING) |
586 | int m_widthForTextAutosizing; |
587 | unsigned m_lineCountForTextAutosizing : 2; |
588 | #endif |
589 | void setSelectionState(SelectionState) final; |
590 | |
591 | void removeInlineBox(BidiRun&, const RootInlineBox&) const; |
592 | |
593 | public: |
594 | // FIXME-BLOCKFLOW: These can be made protected again once all callers have been moved here. |
595 | void (RootInlineBox*, LayoutUnit& deltaOffset, bool& overflowsFragment, RenderFragmentedFlow*); // Computes a deltaOffset value that put a line at the top of the next page if it doesn't fit on the current page. |
596 | void updateFragmentForLine(RootInlineBox*) const; |
597 | |
598 | // Pagination routines. |
599 | bool (); |
600 | |
601 | bool hasRareBlockFlowData() const { return m_rareBlockFlowData.get(); } |
602 | RenderBlockFlowRareData* rareBlockFlowData() const { ASSERT_WITH_SECURITY_IMPLICATION(hasRareBlockFlowData()); return m_rareBlockFlowData.get(); } |
603 | RenderBlockFlowRareData& ensureRareBlockFlowData(); |
604 | void materializeRareBlockFlowData(); |
605 | |
606 | #if ENABLE(TEXT_AUTOSIZING) |
607 | int lineCountForTextAutosizing(); |
608 | void adjustComputedFontSizes(float size, float visibleWidth); |
609 | void resetComputedFontSize() |
610 | { |
611 | m_widthForTextAutosizing = -1; |
612 | m_lineCountForTextAutosizing = NOT_SET; |
613 | } |
614 | #endif |
615 | |
616 | protected: |
617 | std::unique_ptr<FloatingObjects> m_floatingObjects; |
618 | std::unique_ptr<RenderBlockFlowRareData> m_rareBlockFlowData; |
619 | RenderLineBoxList m_lineBoxes; |
620 | std::unique_ptr<SimpleLineLayout::Layout> m_simpleLineLayout; |
621 | |
622 | friend class LineBreaker; |
623 | friend class LineWidth; // Needs to know FloatingObject |
624 | }; |
625 | |
626 | inline const SimpleLineLayout::Layout* RenderBlockFlow::simpleLineLayout() const |
627 | { |
628 | ASSERT(lineLayoutPath() == SimpleLinesPath || !m_simpleLineLayout); |
629 | return m_simpleLineLayout.get(); |
630 | } |
631 | |
632 | } // namespace WebCore |
633 | |
634 | SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderBlockFlow, isRenderBlockFlow()) |
635 | |