1 /*
2 * Copyright (C) 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "config.h"
30 #include "RenderLineBoxList.h"
31
32 #include "InlineTextBox.h"
33 #include "RenderArena.h"
34 #include "RenderInline.h"
35 #include "RenderView.h"
36 #include "RootInlineBox.h"
37
38 using namespace std;
39
40 namespace WebCore {
41
42 #ifndef NDEBUG
~RenderLineBoxList()43 RenderLineBoxList::~RenderLineBoxList()
44 {
45 ASSERT(!m_firstLineBox);
46 ASSERT(!m_lastLineBox);
47 }
48 #endif
49
appendLineBox(InlineFlowBox * box)50 void RenderLineBoxList::appendLineBox(InlineFlowBox* box)
51 {
52 checkConsistency();
53
54 if (!m_firstLineBox)
55 m_firstLineBox = m_lastLineBox = box;
56 else {
57 m_lastLineBox->setNextLineBox(box);
58 box->setPreviousLineBox(m_lastLineBox);
59 m_lastLineBox = box;
60 }
61
62 checkConsistency();
63 }
64
deleteLineBoxTree(RenderArena * arena)65 void RenderLineBoxList::deleteLineBoxTree(RenderArena* arena)
66 {
67 InlineFlowBox* line = m_firstLineBox;
68 InlineFlowBox* nextLine;
69 while (line) {
70 nextLine = line->nextFlowBox();
71 line->deleteLine(arena);
72 line = nextLine;
73 }
74 m_firstLineBox = m_lastLineBox = 0;
75 }
76
extractLineBox(InlineFlowBox * box)77 void RenderLineBoxList::extractLineBox(InlineFlowBox* box)
78 {
79 checkConsistency();
80
81 m_lastLineBox = box->prevFlowBox();
82 if (box == m_firstLineBox)
83 m_firstLineBox = 0;
84 if (box->prevLineBox())
85 box->prevLineBox()->setNextLineBox(0);
86 box->setPreviousLineBox(0);
87 for (InlineRunBox* curr = box; curr; curr = curr->nextLineBox())
88 curr->setExtracted();
89
90 checkConsistency();
91 }
92
attachLineBox(InlineFlowBox * box)93 void RenderLineBoxList::attachLineBox(InlineFlowBox* box)
94 {
95 checkConsistency();
96
97 if (m_lastLineBox) {
98 m_lastLineBox->setNextLineBox(box);
99 box->setPreviousLineBox(m_lastLineBox);
100 } else
101 m_firstLineBox = box;
102 InlineFlowBox* last = box;
103 for (InlineFlowBox* curr = box; curr; curr = curr->nextFlowBox()) {
104 curr->setExtracted(false);
105 last = curr;
106 }
107 m_lastLineBox = last;
108
109 checkConsistency();
110 }
111
removeLineBox(InlineFlowBox * box)112 void RenderLineBoxList::removeLineBox(InlineFlowBox* box)
113 {
114 checkConsistency();
115
116 if (box == m_firstLineBox)
117 m_firstLineBox = box->nextFlowBox();
118 if (box == m_lastLineBox)
119 m_lastLineBox = box->prevFlowBox();
120 if (box->nextLineBox())
121 box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
122 if (box->prevLineBox())
123 box->prevLineBox()->setNextLineBox(box->nextLineBox());
124
125 checkConsistency();
126 }
127
deleteLineBoxes(RenderArena * arena)128 void RenderLineBoxList::deleteLineBoxes(RenderArena* arena)
129 {
130 if (m_firstLineBox) {
131 InlineRunBox* next;
132 for (InlineRunBox* curr = m_firstLineBox; curr; curr = next) {
133 next = curr->nextLineBox();
134 curr->destroy(arena);
135 }
136 m_firstLineBox = 0;
137 m_lastLineBox = 0;
138 }
139 }
140
dirtyLineBoxes()141 void RenderLineBoxList::dirtyLineBoxes()
142 {
143 for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
144 curr->dirtyLineBoxes();
145 }
146
paint(RenderBoxModelObject * renderer,RenderObject::PaintInfo & paintInfo,int tx,int ty) const147 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, RenderObject::PaintInfo& paintInfo, int tx, int ty) const
148 {
149 // Only paint during the foreground/selection phases.
150 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline
151 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
152 && paintInfo.phase != PaintPhaseMask)
153 return;
154
155 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.
156
157 // If we have no lines then we have no work to do.
158 if (!firstLineBox())
159 return;
160
161 // We can check the first box and last box and avoid painting if we don't
162 // intersect. This is a quick short-circuit that we can take to avoid walking any lines.
163 // FIXME: This check is flawed in the following extremely obscure way:
164 // if some line in the middle has a huge overflow, it might actually extend below the last line.
165 int yPos = firstLineBox()->topVisibleOverflow() - renderer->maximalOutlineSize(paintInfo.phase);
166 int h = renderer->maximalOutlineSize(paintInfo.phase) + lastLineBox()->bottomVisibleOverflow() - yPos;
167 yPos += ty;
168 if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y())
169 return;
170
171 RenderObject::PaintInfo info(paintInfo);
172 ListHashSet<RenderInline*> outlineObjects;
173 info.outlineObjects = &outlineObjects;
174
175 // See if our root lines intersect with the dirty rect. If so, then we paint
176 // them. Note that boxes can easily overlap, so we can't make any assumptions
177 // based off positions of our first line box or our last line box.
178 RenderView* v = renderer->view();
179 bool usePrintRect = !v->printRect().isEmpty();
180 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextFlowBox()) {
181 if (usePrintRect) {
182 // FIXME: This is a feeble effort to avoid splitting a line across two pages.
183 // It is utterly inadequate, and this should not be done at paint time at all.
184 // The whole way objects break across pages needs to be redone.
185 // Try to avoid splitting a line vertically, but only if it's less than the height
186 // of the entire page.
187 if (curr->bottomVisibleOverflow() - curr->topVisibleOverflow() <= v->printRect().height()) {
188 if (ty + curr->bottomVisibleOverflow() > v->printRect().bottom()) {
189 if (ty + curr->topVisibleOverflow() < v->truncatedAt())
190 v->setBestTruncatedAt(ty + curr->root()->topVisibleOverflow(), renderer);
191 // If we were able to truncate, don't paint.
192 if (ty + curr->topVisibleOverflow() >= v->truncatedAt())
193 break;
194 }
195 }
196 }
197
198 int top = min(curr->topVisibleOverflow(), curr->root()->selectionTop()) - renderer->maximalOutlineSize(info.phase);
199 int bottom = curr->bottomVisibleOverflow() + renderer->maximalOutlineSize(info.phase);
200 h = bottom - top;
201 yPos = ty + top;
202 v->setMinimumColumnHeight(h);
203 if (yPos < info.rect.bottom() && yPos + h > info.rect.y())
204 curr->paint(info, tx, ty);
205 }
206
207 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
208 ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
209 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
210 RenderInline* flow = *it;
211 flow->paintOutline(info.context, tx, ty);
212 }
213 info.outlineObjects->clear();
214 }
215 }
216
217
hitTest(RenderBoxModelObject * renderer,const HitTestRequest & request,HitTestResult & result,int x,int y,int tx,int ty,HitTestAction hitTestAction) const218 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) const
219 {
220 if (hitTestAction != HitTestForeground)
221 return false;
222
223 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
224
225 // If we have no lines then we have no work to do.
226 if (!firstLineBox())
227 return false;
228
229 // We can check the first box and last box and avoid hit testing if we don't
230 // contain the point. This is a quick short-circuit that we can take to avoid walking any lines.
231 // FIXME: This check is flawed in the following extremely obscure way:
232 // if some line in the middle has a huge overflow, it might actually extend below the last line.
233 if ((y >= ty + lastLineBox()->root()->bottomVisibleOverflow()) || (y < ty + firstLineBox()->root()->topVisibleOverflow()))
234 return false;
235
236 // See if our root lines contain the point. If so, then we hit test
237 // them further. Note that boxes can easily overlap, so we can't make any assumptions
238 // based off positions of our first line box or our last line box.
239 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevFlowBox()) {
240 if (y >= ty + curr->root()->topVisibleOverflow() && y < ty + curr->root()->bottomVisibleOverflow()) {
241 bool inside = curr->nodeAtPoint(request, result, x, y, tx, ty);
242 if (inside) {
243 renderer->updateHitTestResult(result, IntPoint(x - tx, y - ty));
244 return true;
245 }
246 }
247 }
248
249 return false;
250 }
251
dirtyLinesFromChangedChild(RenderObject * container,RenderObject * child)252 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
253 {
254 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow())))
255 return;
256
257 // If we have no first line box, then just bail early.
258 if (!firstLineBox()) {
259 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
260 // is already dirty.
261 if (container->isInline() && !container->parent()->selfNeedsLayout())
262 container->parent()->dirtyLinesFromChangedChild(container);
263 return;
264 }
265
266 // Try to figure out which line box we belong in. First try to find a previous
267 // line box by examining our siblings. If we didn't find a line box, then use our
268 // parent's first line box.
269 RootInlineBox* box = 0;
270 RenderObject* curr = 0;
271 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
272 if (curr->isFloatingOrPositioned())
273 continue;
274
275 if (curr->isReplaced()) {
276 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
277 if (wrapper)
278 box = wrapper->root();
279 } else if (curr->isText()) {
280 InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
281 if (textBox)
282 box = textBox->root();
283 } else if (curr->isRenderInline()) {
284 InlineRunBox* runBox = toRenderInline(curr)->lastLineBox();
285 if (runBox)
286 box = runBox->root();
287 }
288
289 if (box)
290 break;
291 }
292 if (!box)
293 box = firstLineBox()->root();
294
295 // If we found a line box, then dirty it.
296 if (box) {
297 RootInlineBox* adjacentBox;
298 box->markDirty();
299
300 // dirty the adjacent lines that might be affected
301 // NOTE: we dirty the previous line because RootInlineBox objects cache
302 // the address of the first object on the next line after a BR, which we may be
303 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
304 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
305 // despite the name, actually returns the first RenderObject after the BR.
306 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
307 adjacentBox = box->prevRootBox();
308 if (adjacentBox)
309 adjacentBox->markDirty();
310 if (child->isBR() || (curr && curr->isBR())) {
311 adjacentBox = box->nextRootBox();
312 if (adjacentBox)
313 adjacentBox->markDirty();
314 }
315 }
316 }
317
318 #ifndef NDEBUG
319
checkConsistency() const320 void RenderLineBoxList::checkConsistency() const
321 {
322 #ifdef CHECK_CONSISTENCY
323 const InlineFlowBox* prev = 0;
324 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextFlowBox()) {
325 ASSERT(child->prevFlowBox() == prev);
326 prev = child;
327 }
328 ASSERT(prev == m_lastLineBox);
329 #endif
330 }
331
332 #endif
333
334 }
335