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 "core/rendering/RenderLineBoxList.h" 31 32 #include "core/rendering/HitTestResult.h" 33 #include "core/rendering/InlineTextBox.h" 34 #include "core/rendering/PaintInfo.h" 35 #include "core/rendering/RenderInline.h" 36 #include "core/rendering/RenderView.h" 37 #include "core/rendering/RootInlineBox.h" 38 39 using namespace std; 40 41 namespace WebCore { 42 43 #ifndef NDEBUG 44 RenderLineBoxList::~RenderLineBoxList() 45 { 46 ASSERT(!m_firstLineBox); 47 ASSERT(!m_lastLineBox); 48 } 49 #endif 50 51 void RenderLineBoxList::appendLineBox(InlineFlowBox* box) 52 { 53 checkConsistency(); 54 55 if (!m_firstLineBox) 56 m_firstLineBox = m_lastLineBox = box; 57 else { 58 m_lastLineBox->setNextLineBox(box); 59 box->setPreviousLineBox(m_lastLineBox); 60 m_lastLineBox = box; 61 } 62 63 checkConsistency(); 64 } 65 66 void RenderLineBoxList::deleteLineBoxTree() 67 { 68 InlineFlowBox* line = m_firstLineBox; 69 InlineFlowBox* nextLine; 70 while (line) { 71 nextLine = line->nextLineBox(); 72 line->deleteLine(); 73 line = nextLine; 74 } 75 m_firstLineBox = m_lastLineBox = 0; 76 } 77 78 void RenderLineBoxList::extractLineBox(InlineFlowBox* box) 79 { 80 checkConsistency(); 81 82 m_lastLineBox = box->prevLineBox(); 83 if (box == m_firstLineBox) 84 m_firstLineBox = 0; 85 if (box->prevLineBox()) 86 box->prevLineBox()->setNextLineBox(0); 87 box->setPreviousLineBox(0); 88 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) 89 curr->setExtracted(); 90 91 checkConsistency(); 92 } 93 94 void RenderLineBoxList::attachLineBox(InlineFlowBox* box) 95 { 96 checkConsistency(); 97 98 if (m_lastLineBox) { 99 m_lastLineBox->setNextLineBox(box); 100 box->setPreviousLineBox(m_lastLineBox); 101 } else 102 m_firstLineBox = box; 103 InlineFlowBox* last = box; 104 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) { 105 curr->setExtracted(false); 106 last = curr; 107 } 108 m_lastLineBox = last; 109 110 checkConsistency(); 111 } 112 113 void RenderLineBoxList::removeLineBox(InlineFlowBox* box) 114 { 115 checkConsistency(); 116 117 if (box == m_firstLineBox) 118 m_firstLineBox = box->nextLineBox(); 119 if (box == m_lastLineBox) 120 m_lastLineBox = box->prevLineBox(); 121 if (box->nextLineBox()) 122 box->nextLineBox()->setPreviousLineBox(box->prevLineBox()); 123 if (box->prevLineBox()) 124 box->prevLineBox()->setNextLineBox(box->nextLineBox()); 125 126 checkConsistency(); 127 } 128 129 void RenderLineBoxList::deleteLineBoxes() 130 { 131 if (m_firstLineBox) { 132 InlineFlowBox* next; 133 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { 134 next = curr->nextLineBox(); 135 curr->destroy(); 136 } 137 m_firstLineBox = 0; 138 m_lastLineBox = 0; 139 } 140 } 141 142 void RenderLineBoxList::dirtyLineBoxes() 143 { 144 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) 145 curr->dirtyLineBoxes(); 146 } 147 148 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const 149 { 150 RenderBox* block; 151 if (renderer->isBox()) 152 block = toRenderBox(renderer); 153 else 154 block = renderer->containingBlock(); 155 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop); 156 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom); 157 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart); 158 physicalStart = min(physicalStart, physicalEnd); 159 160 if (renderer->style()->isHorizontalWritingMode()) { 161 physicalStart += offset.y(); 162 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y()) 163 return false; 164 } else { 165 physicalStart += offset.x(); 166 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x()) 167 return false; 168 } 169 170 return true; 171 } 172 173 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset) const 174 { 175 // We can check the first box and last box and avoid painting/hit testing if we don't 176 // intersect. This is a quick short-circuit that we can take to avoid walking any lines. 177 // FIXME: This check is flawed in the following extremely obscure way: 178 // if some line in the middle has a huge overflow, it might actually extend below the last line. 179 RootInlineBox& firstRootBox = firstLineBox()->root(); 180 RootInlineBox& lastRootBox = lastLineBox()->root(); 181 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop()); 182 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom()); 183 184 return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset); 185 } 186 187 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const 188 { 189 RootInlineBox& root = box->root(); 190 LayoutUnit logicalTop = min<LayoutUnit>(box->logicalTopVisualOverflow(root.lineTop()), root.selectionTop()); 191 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root.lineBottom()); 192 193 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset); 194 } 195 196 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const 197 { 198 // Only paint during the foreground/selection phases. 199 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline 200 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip 201 && paintInfo.phase != PaintPhaseMask) 202 return; 203 204 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer. 205 206 // If we have no lines then we have no work to do. 207 if (!firstLineBox()) 208 return; 209 210 if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset)) 211 return; 212 213 PaintInfo info(paintInfo); 214 ListHashSet<RenderInline*> outlineObjects; 215 info.setOutlineObjects(&outlineObjects); 216 217 // See if our root lines intersect with the dirty rect. If so, then we paint 218 // them. Note that boxes can easily overlap, so we can't make any assumptions 219 // based off positions of our first line box or our last line box. 220 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { 221 if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) { 222 RootInlineBox& root = curr->root(); 223 curr->paint(info, paintOffset, root.lineTop(), root.lineBottom()); 224 } 225 } 226 227 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) { 228 ListHashSet<RenderInline*>::iterator end = info.outlineObjects()->end(); 229 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects()->begin(); it != end; ++it) { 230 RenderInline* flow = *it; 231 flow->paintOutline(info, paintOffset); 232 } 233 info.outlineObjects()->clear(); 234 } 235 } 236 237 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const 238 { 239 if (hitTestAction != HitTestForeground) 240 return false; 241 242 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. 243 244 // If we have no lines then we have no work to do. 245 if (!firstLineBox()) 246 return false; 247 248 LayoutPoint point = locationInContainer.point(); 249 LayoutRect rect = firstLineBox()->isHorizontal() ? 250 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) : 251 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1); 252 253 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset)) 254 return false; 255 256 // See if our root lines contain the point. If so, then we hit test 257 // them further. Note that boxes can easily overlap, so we can't make any assumptions 258 // based off positions of our first line box or our last line box. 259 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { 260 RootInlineBox& root = curr->root(); 261 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) { 262 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom()); 263 if (inside) { 264 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); 265 return true; 266 } 267 } 268 } 269 270 return false; 271 } 272 273 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child) 274 { 275 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow()))) 276 return; 277 278 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0; 279 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox(); 280 281 // If we have no first line box, then just bail early. 282 if (!firstBox) { 283 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent 284 // is already dirty. 285 if (container->isInline() && !container->ancestorLineBoxDirty()) { 286 container->parent()->dirtyLinesFromChangedChild(container); 287 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 288 } 289 return; 290 } 291 292 // Try to figure out which line box we belong in. First try to find a previous 293 // line box by examining our siblings. If we didn't find a line box, then use our 294 // parent's first line box. 295 RootInlineBox* box = 0; 296 RenderObject* curr = 0; 297 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) { 298 if (curr->isFloatingOrOutOfFlowPositioned()) 299 continue; 300 301 if (curr->isReplaced()) { 302 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper(); 303 if (wrapper) 304 box = &wrapper->root(); 305 } else if (curr->isText()) { 306 InlineTextBox* textBox = toRenderText(curr)->lastTextBox(); 307 if (textBox) 308 box = &textBox->root(); 309 } else if (curr->isRenderInline()) { 310 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling(); 311 if (lastSiblingBox) 312 box = &lastSiblingBox->root(); 313 } 314 315 if (box) 316 break; 317 } 318 if (!box) { 319 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) { 320 // https://bugs.webkit.org/show_bug.cgi?id=60778 321 // We may have just removed a <br> with no line box that was our first child. In this case 322 // we won't find a previous sibling, but firstBox can be pointing to a following sibling. 323 // This isn't good enough, since we won't locate the root line box that encloses the removed 324 // <br>. We have to just over-invalidate a bit and go up to our parent. 325 if (!inlineContainer->ancestorLineBoxDirty()) { 326 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer); 327 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 328 } 329 return; 330 } 331 box = &firstBox->root(); 332 } 333 334 // If we found a line box, then dirty it. 335 if (box) { 336 RootInlineBox* adjacentBox; 337 box->markDirty(); 338 339 // dirty the adjacent lines that might be affected 340 // NOTE: we dirty the previous line because RootInlineBox objects cache 341 // the address of the first object on the next line after a BR, which we may be 342 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren 343 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak, 344 // despite the name, actually returns the first RenderObject after the BR. 345 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize." 346 adjacentBox = box->prevRootBox(); 347 if (adjacentBox) 348 adjacentBox->markDirty(); 349 adjacentBox = box->nextRootBox(); 350 // If |child| has been inserted before the first element in the linebox, but after collapsed leading 351 // space, the search for |child|'s linebox will go past the leading space to the previous linebox and select that 352 // one as |box|. If we hit that situation here, dirty the |box| actually containing the child too. 353 bool insertedAfterLeadingSpace = box->lineBreakObj() == child->previousSibling(); 354 if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR()) 355 || insertedAfterLeadingSpace || isIsolated(container->style()->unicodeBidi()))) { 356 adjacentBox->markDirty(); 357 } 358 } 359 } 360 361 #ifndef NDEBUG 362 363 void RenderLineBoxList::checkConsistency() const 364 { 365 #ifdef CHECK_CONSISTENCY 366 const InlineFlowBox* prev = 0; 367 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) { 368 ASSERT(child->prevLineBox() == prev); 369 prev = child; 370 } 371 ASSERT(prev == m_lastLineBox); 372 #endif 373 } 374 375 #endif 376 377 } 378
