1 /*
2 * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20
21 #ifndef InlineFlowBox_h
22 #define InlineFlowBox_h
23
24 #include "core/rendering/InlineBox.h"
25 #include "core/rendering/RenderObjectInlines.h"
26 #include "core/rendering/RenderOverflow.h"
27 #include "core/rendering/style/ShadowData.h"
28
29 namespace blink {
30
31 class HitTestRequest;
32 class HitTestResult;
33 class InlineTextBox;
34 class RenderLineBoxList;
35 class SimpleFontData;
36 class VerticalPositionCache;
37
38 struct GlyphOverflow;
39
40 typedef HashMap<const InlineTextBox*, pair<Vector<const SimpleFontData*>, GlyphOverflow> > GlyphOverflowAndFallbackFontsMap;
41
42 class InlineFlowBox : public InlineBox {
43 public:
InlineFlowBox(RenderObject & obj)44 InlineFlowBox(RenderObject& obj)
45 : InlineBox(obj)
46 , m_firstChild(0)
47 , m_lastChild(0)
48 , m_prevLineBox(0)
49 , m_nextLineBox(0)
50 , m_includeLogicalLeftEdge(false)
51 , m_includeLogicalRightEdge(false)
52 , m_descendantsHaveSameLineHeightAndBaseline(true)
53 , m_baselineType(AlphabeticBaseline)
54 , m_hasAnnotationsBefore(false)
55 , m_hasAnnotationsAfter(false)
56 , m_lineBreakBidiStatusEor(WTF::Unicode::LeftToRight)
57 , m_lineBreakBidiStatusLastStrong(WTF::Unicode::LeftToRight)
58 , m_lineBreakBidiStatusLast(WTF::Unicode::LeftToRight)
59 #if ENABLE(ASSERT)
60 , m_hasBadChildList(false)
61 #endif
62 {
63 // Internet Explorer and Firefox always create a marker for list items, even when the list-style-type is none. We do not make a marker
64 // in the list-style-type: none case, since it is wasteful to do so. However, in order to match other browsers we have to pretend like
65 // an invisible marker exists. The side effect of having an invisible marker is that the quirks mode behavior of shrinking lines with no
66 // text children must not apply. This change also means that gaps will exist between image bullet list items. Even when the list bullet
67 // is an image, the line is still considered to be immune from the quirk.
68 m_hasTextChildren = obj.style()->display() == LIST_ITEM;
69 m_hasTextDescendants = m_hasTextChildren;
70 }
71
72 #if ENABLE(ASSERT)
73 virtual ~InlineFlowBox();
74 #endif
75
76 #ifndef NDEBUG
77 virtual void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0, int = 0) const OVERRIDE;
78 virtual const char* boxName() const OVERRIDE;
79 #endif
80
prevLineBox()81 InlineFlowBox* prevLineBox() const { return m_prevLineBox; }
nextLineBox()82 InlineFlowBox* nextLineBox() const { return m_nextLineBox; }
setNextLineBox(InlineFlowBox * n)83 void setNextLineBox(InlineFlowBox* n) { m_nextLineBox = n; }
setPreviousLineBox(InlineFlowBox * p)84 void setPreviousLineBox(InlineFlowBox* p) { m_prevLineBox = p; }
85
firstChild()86 InlineBox* firstChild() const { checkConsistency(); return m_firstChild; }
lastChild()87 InlineBox* lastChild() const { checkConsistency(); return m_lastChild; }
88
isLeaf()89 virtual bool isLeaf() const OVERRIDE FINAL { return false; }
90
91 InlineBox* firstLeafChild() const;
92 InlineBox* lastLeafChild() const;
93
94 typedef void (*CustomInlineBoxRangeReverse)(void* userData, Vector<InlineBox*>::iterator first, Vector<InlineBox*>::iterator last);
95 void collectLeafBoxesInLogicalOrder(Vector<InlineBox*>&, CustomInlineBoxRangeReverse customReverseImplementation = 0, void* userData = 0) const;
96
setConstructed()97 virtual void setConstructed() OVERRIDE FINAL
98 {
99 InlineBox::setConstructed();
100 for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
101 child->setConstructed();
102 }
103
104 void addToLine(InlineBox* child);
105 virtual void deleteLine() OVERRIDE FINAL;
106 virtual void extractLine() OVERRIDE FINAL;
107 virtual void attachLine() OVERRIDE FINAL;
108 virtual void adjustPosition(float dx, float dy) OVERRIDE;
109
110 virtual void extractLineBoxFromRenderObject();
111 virtual void attachLineBoxToRenderObject();
112 virtual void removeLineBoxFromRenderObject();
113
114 virtual void clearTruncation() OVERRIDE;
115
116 IntRect roundedFrameRect() const;
117
118 virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
119 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
120
121 bool boxShadowCanBeAppliedToBackground(const FillLayer&) const;
122
123 virtual RenderLineBoxList* rendererLineBoxes() const;
124
125 // logicalLeft = left in a horizontal line and top in a vertical line.
marginBorderPaddingLogicalLeft()126 LayoutUnit marginBorderPaddingLogicalLeft() const { return marginLogicalLeft() + borderLogicalLeft() + paddingLogicalLeft(); }
marginBorderPaddingLogicalRight()127 LayoutUnit marginBorderPaddingLogicalRight() const { return marginLogicalRight() + borderLogicalRight() + paddingLogicalRight(); }
marginLogicalLeft()128 LayoutUnit marginLogicalLeft() const
129 {
130 if (!includeLogicalLeftEdge())
131 return 0;
132 return isHorizontal() ? boxModelObject()->marginLeft() : boxModelObject()->marginTop();
133 }
marginLogicalRight()134 LayoutUnit marginLogicalRight() const
135 {
136 if (!includeLogicalRightEdge())
137 return 0;
138 return isHorizontal() ? boxModelObject()->marginRight() : boxModelObject()->marginBottom();
139 }
borderLogicalLeft()140 int borderLogicalLeft() const
141 {
142 if (!includeLogicalLeftEdge())
143 return 0;
144 return isHorizontal() ? renderer().style(isFirstLineStyle())->borderLeftWidth() : renderer().style(isFirstLineStyle())->borderTopWidth();
145 }
borderLogicalRight()146 int borderLogicalRight() const
147 {
148 if (!includeLogicalRightEdge())
149 return 0;
150 return isHorizontal() ? renderer().style(isFirstLineStyle())->borderRightWidth() : renderer().style(isFirstLineStyle())->borderBottomWidth();
151 }
paddingLogicalLeft()152 int paddingLogicalLeft() const
153 {
154 if (!includeLogicalLeftEdge())
155 return 0;
156 return isHorizontal() ? boxModelObject()->paddingLeft() : boxModelObject()->paddingTop();
157 }
paddingLogicalRight()158 int paddingLogicalRight() const
159 {
160 if (!includeLogicalRightEdge())
161 return 0;
162 return isHorizontal() ? boxModelObject()->paddingRight() : boxModelObject()->paddingBottom();
163 }
164
includeLogicalLeftEdge()165 bool includeLogicalLeftEdge() const { return m_includeLogicalLeftEdge; }
includeLogicalRightEdge()166 bool includeLogicalRightEdge() const { return m_includeLogicalRightEdge; }
setEdges(bool includeLeft,bool includeRight)167 void setEdges(bool includeLeft, bool includeRight)
168 {
169 m_includeLogicalLeftEdge = includeLeft;
170 m_includeLogicalRightEdge = includeRight;
171 }
172
173 // Helper functions used during line construction and placement.
174 void determineSpacingForFlowBoxes(bool lastLine, bool isLogicallyLastRunWrapped, RenderObject* logicallyLastRunRenderer);
175 LayoutUnit getFlowSpacingLogicalWidth();
176 float placeBoxesInInlineDirection(float logicalLeft, bool& needsWordSpacing);
177 float placeBoxRangeInInlineDirection(InlineBox* firstChild, InlineBox* lastChild,
178 float& logicalLeft, float& minLogicalLeft, float& maxLogicalRight, bool& needsWordSpacing);
beginPlacingBoxRangesInInlineDirection(float logicalLeft)179 void beginPlacingBoxRangesInInlineDirection(float logicalLeft) { setLogicalLeft(logicalLeft); }
endPlacingBoxRangesInInlineDirection(float logicalLeft,float logicalRight,float minLogicalLeft,float maxLogicalRight)180 void endPlacingBoxRangesInInlineDirection(float logicalLeft, float logicalRight, float minLogicalLeft, float maxLogicalRight)
181 {
182 setLogicalWidth(logicalRight - logicalLeft);
183 if (knownToHaveNoOverflow() && (minLogicalLeft < logicalLeft || maxLogicalRight > logicalRight))
184 clearKnownToHaveNoOverflow();
185 }
186
187 void computeLogicalBoxHeights(RootInlineBox*, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom,
188 int& maxAscent, int& maxDescent, bool& setMaxAscent, bool& setMaxDescent,
189 bool strictMode, GlyphOverflowAndFallbackFontsMap&, FontBaseline, VerticalPositionCache&);
190 void adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent,
191 int maxPositionTop, int maxPositionBottom);
192 void placeBoxesInBlockDirection(LayoutUnit logicalTop, LayoutUnit maxHeight, int maxAscent, bool strictMode, LayoutUnit& lineTop, LayoutUnit& lineBottom, LayoutUnit& selectionBottom, bool& setLineTop,
193 LayoutUnit& lineTopIncludingMargins, LayoutUnit& lineBottomIncludingMargins, bool& hasAnnotationsBefore, bool& hasAnnotationsAfter, FontBaseline);
194 void flipLinesInBlockDirection(LayoutUnit lineTop, LayoutUnit lineBottom);
195 bool requiresIdeographicBaseline(const GlyphOverflowAndFallbackFontsMap&) const;
196
197 LayoutUnit computeOverAnnotationAdjustment(LayoutUnit allowedPosition) const;
198 LayoutUnit computeUnderAnnotationAdjustment(LayoutUnit allowedPosition) const;
199
200 void computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap&);
201
202 void removeChild(InlineBox* child, MarkLineBoxes);
203
204 virtual RenderObject::SelectionState selectionState() const OVERRIDE;
205
206 virtual bool canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const OVERRIDE FINAL;
207 virtual float placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool&) OVERRIDE;
208
hasTextChildren()209 bool hasTextChildren() const { return m_hasTextChildren; }
hasTextDescendants()210 bool hasTextDescendants() const { return m_hasTextDescendants; }
setHasTextChildren()211 void setHasTextChildren() { m_hasTextChildren = true; setHasTextDescendants(); }
setHasTextDescendants()212 void setHasTextDescendants() { m_hasTextDescendants = true; }
213
214 void checkConsistency() const;
215 void setHasBadChildList();
216
217 // Line visual and layout overflow are in the coordinate space of the block. This means that they aren't purely physical directions.
218 // For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right
219 // respectively are flipped when compared to their physical counterparts. For example minX is on the left in vertical-lr, but it is on the right in vertical-rl.
layoutOverflowRect(LayoutUnit lineTop,LayoutUnit lineBottom)220 LayoutRect layoutOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
221 {
222 return m_overflow ? m_overflow->layoutOverflowRect() : enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
223 }
logicalLeftLayoutOverflow()224 LayoutUnit logicalLeftLayoutOverflow() const
225 {
226 return m_overflow ? (isHorizontal() ? m_overflow->layoutOverflowRect().x() : m_overflow->layoutOverflowRect().y()) :
227 static_cast<LayoutUnit>(logicalLeft());
228 }
logicalRightLayoutOverflow()229 LayoutUnit logicalRightLayoutOverflow() const
230 {
231 return m_overflow ? (isHorizontal() ? m_overflow->layoutOverflowRect().maxX() : m_overflow->layoutOverflowRect().maxY()) :
232 static_cast<LayoutUnit>(ceilf(logicalRight()));
233 }
logicalTopLayoutOverflow(LayoutUnit lineTop)234 LayoutUnit logicalTopLayoutOverflow(LayoutUnit lineTop) const
235 {
236 if (m_overflow)
237 return isHorizontal() ? m_overflow->layoutOverflowRect().y() : m_overflow->layoutOverflowRect().x();
238 return lineTop;
239 }
logicalBottomLayoutOverflow(LayoutUnit lineBottom)240 LayoutUnit logicalBottomLayoutOverflow(LayoutUnit lineBottom) const
241 {
242 if (m_overflow)
243 return isHorizontal() ? m_overflow->layoutOverflowRect().maxY() : m_overflow->layoutOverflowRect().maxX();
244 return lineBottom;
245 }
logicalLayoutOverflowRect(LayoutUnit lineTop,LayoutUnit lineBottom)246 LayoutRect logicalLayoutOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
247 {
248 LayoutRect result = layoutOverflowRect(lineTop, lineBottom);
249 if (!renderer().isHorizontalWritingMode())
250 result = result.transposedRect();
251 return result;
252 }
253
visualOverflowRect(LayoutUnit lineTop,LayoutUnit lineBottom)254 LayoutRect visualOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
255 {
256 return m_overflow ? m_overflow->visualOverflowRect() : enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
257 }
logicalLeftVisualOverflow()258 LayoutUnit logicalLeftVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().x() : m_overflow->visualOverflowRect().y()) : static_cast<LayoutUnit>(logicalLeft()); }
logicalRightVisualOverflow()259 LayoutUnit logicalRightVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().maxX() : m_overflow->visualOverflowRect().maxY()) : static_cast<LayoutUnit>(ceilf(logicalRight())); }
logicalTopVisualOverflow(LayoutUnit lineTop)260 LayoutUnit logicalTopVisualOverflow(LayoutUnit lineTop) const
261 {
262 if (m_overflow)
263 return isHorizontal() ? m_overflow->visualOverflowRect().y() : m_overflow->visualOverflowRect().x();
264 return lineTop;
265 }
logicalBottomVisualOverflow(LayoutUnit lineBottom)266 LayoutUnit logicalBottomVisualOverflow(LayoutUnit lineBottom) const
267 {
268 if (m_overflow)
269 return isHorizontal() ? m_overflow->visualOverflowRect().maxY() : m_overflow->visualOverflowRect().maxX();
270 return lineBottom;
271 }
logicalVisualOverflowRect(LayoutUnit lineTop,LayoutUnit lineBottom)272 LayoutRect logicalVisualOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
273 {
274 LayoutRect result = visualOverflowRect(lineTop, lineBottom);
275 if (!renderer().isHorizontalWritingMode())
276 result = result.transposedRect();
277 return result;
278 }
279
280 void setOverflowFromLogicalRects(const LayoutRect& logicalLayoutOverflow, const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom);
281
frameRectIncludingLineHeight(LayoutUnit lineTop,LayoutUnit lineBottom)282 FloatRect frameRectIncludingLineHeight(LayoutUnit lineTop, LayoutUnit lineBottom) const
283 {
284 if (isHorizontal())
285 return FloatRect(m_topLeft.x(), lineTop.toFloat(), width(), (lineBottom - lineTop).toFloat());
286 return FloatRect(lineTop.toFloat(), m_topLeft.y(), (lineBottom - lineTop).toFloat(), height());
287 }
288
logicalFrameRectIncludingLineHeight(LayoutUnit lineTop,LayoutUnit lineBottom)289 FloatRect logicalFrameRectIncludingLineHeight(LayoutUnit lineTop, LayoutUnit lineBottom) const
290 {
291 return FloatRect(logicalLeft(), lineTop.toFloat(), logicalWidth(), (lineBottom - lineTop).toFloat());
292 }
293
descendantsHaveSameLineHeightAndBaseline()294 bool descendantsHaveSameLineHeightAndBaseline() const { return m_descendantsHaveSameLineHeightAndBaseline; }
clearDescendantsHaveSameLineHeightAndBaseline()295 void clearDescendantsHaveSameLineHeightAndBaseline()
296 {
297 m_descendantsHaveSameLineHeightAndBaseline = false;
298 if (parent() && parent()->descendantsHaveSameLineHeightAndBaseline())
299 parent()->clearDescendantsHaveSameLineHeightAndBaseline();
300 }
301
302 private:
303 void addBoxShadowVisualOverflow(LayoutRect& logicalVisualOverflow);
304 void addBorderOutsetVisualOverflow(LayoutRect& logicalVisualOverflow);
305 void addOutlineVisualOverflow(LayoutRect& logicalVisualOverflow);
306 void addTextBoxVisualOverflow(InlineTextBox*, GlyphOverflowAndFallbackFontsMap&, LayoutRect& logicalVisualOverflow);
307 void addReplacedChildOverflow(const InlineBox*, LayoutRect& logicalLayoutOverflow, LayoutRect& logicalVisualOverflow);
308 void constrainToLineTopAndBottomIfNeeded(LayoutRect&) const;
309
310 void setLayoutOverflow(const LayoutRect&, const LayoutRect&);
311 void setVisualOverflow(const LayoutRect&, const LayoutRect&);
312
313 protected:
314 OwnPtr<RenderOverflow> m_overflow;
315
isInlineFlowBox()316 virtual bool isInlineFlowBox() const OVERRIDE FINAL { return true; }
317
318 InlineBox* m_firstChild;
319 InlineBox* m_lastChild;
320
321 InlineFlowBox* m_prevLineBox; // The previous box that also uses our RenderObject
322 InlineFlowBox* m_nextLineBox; // The next box that also uses our RenderObject
323
324 // Maximum logicalTop among all children of an InlineFlowBox. Used to
325 // calculate the offset for TextUnderlinePositionUnder.
326 void computeMaxLogicalTop(float& maxLogicalTop) const;
327
328 private:
329 unsigned m_includeLogicalLeftEdge : 1;
330 unsigned m_includeLogicalRightEdge : 1;
331 unsigned m_hasTextChildren : 1;
332 unsigned m_hasTextDescendants : 1;
333 unsigned m_descendantsHaveSameLineHeightAndBaseline : 1;
334
335 protected:
336 // The following members are only used by RootInlineBox but moved here to keep the bits packed.
337
338 // Whether or not this line uses alphabetic or ideographic baselines by default.
339 unsigned m_baselineType : 1; // FontBaseline
340
341 // If the line contains any ruby runs, then this will be true.
342 unsigned m_hasAnnotationsBefore : 1;
343 unsigned m_hasAnnotationsAfter : 1;
344
345 unsigned m_lineBreakBidiStatusEor : 5; // WTF::Unicode::Direction
346 unsigned m_lineBreakBidiStatusLastStrong : 5; // WTF::Unicode::Direction
347 unsigned m_lineBreakBidiStatusLast : 5; // WTF::Unicode::Direction
348
349 // End of RootInlineBox-specific members.
350
351 #if ENABLE(ASSERT)
352 private:
353 unsigned m_hasBadChildList : 1;
354 #endif
355 };
356
357 DEFINE_INLINE_BOX_TYPE_CASTS(InlineFlowBox);
358
359 #if !ENABLE(ASSERT)
checkConsistency()360 inline void InlineFlowBox::checkConsistency() const
361 {
362 }
363 #endif
364
setHasBadChildList()365 inline void InlineFlowBox::setHasBadChildList()
366 {
367 #if ENABLE(ASSERT)
368 m_hasBadChildList = true;
369 #endif
370 }
371
372 } // namespace blink
373
374 #ifndef NDEBUG
375 // Outside the WebCore namespace for ease of invocation from gdb.
376 void showTree(const blink::InlineFlowBox*);
377 #endif
378
379 #endif // InlineFlowBox_h
380