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/paint/InlinePainter.h" 33 #include "core/rendering/HitTestResult.h" 34 #include "core/rendering/InlineTextBox.h" 35 #include "core/rendering/PaintInfo.h" 36 #include "core/rendering/RenderInline.h" 37 #include "core/rendering/RenderView.h" 38 #include "core/rendering/RootInlineBox.h" 39 40 namespace blink { 41 42 #if ENABLE(ASSERT) 43 RenderLineBoxList::~RenderLineBoxList() 44 { 45 ASSERT(!m_firstLineBox); 46 ASSERT(!m_lastLineBox); 47 } 48 #endif 49 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 65 void RenderLineBoxList::deleteLineBoxTree() 66 { 67 InlineFlowBox* line = m_firstLineBox; 68 InlineFlowBox* nextLine; 69 while (line) { 70 nextLine = line->nextLineBox(); 71 line->deleteLine(); 72 line = nextLine; 73 } 74 m_firstLineBox = m_lastLineBox = 0; 75 } 76 77 void RenderLineBoxList::extractLineBox(InlineFlowBox* box) 78 { 79 checkConsistency(); 80 81 m_lastLineBox = box->prevLineBox(); 82 if (box == m_firstLineBox) 83 m_firstLineBox = 0; 84 if (box->prevLineBox()) 85 box->prevLineBox()->setNextLineBox(0); 86 box->setPreviousLineBox(0); 87 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) 88 curr->setExtracted(); 89 90 checkConsistency(); 91 } 92 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->nextLineBox()) { 104 curr->setExtracted(false); 105 last = curr; 106 } 107 m_lastLineBox = last; 108 109 checkConsistency(); 110 } 111 112 void RenderLineBoxList::removeLineBox(InlineFlowBox* box) 113 { 114 checkConsistency(); 115 116 if (box == m_firstLineBox) 117 m_firstLineBox = box->nextLineBox(); 118 if (box == m_lastLineBox) 119 m_lastLineBox = box->prevLineBox(); 120 if (box->nextLineBox()) 121 box->nextLineBox()->setPreviousLineBox(box->prevLineBox()); 122 if (box->prevLineBox()) 123 box->prevLineBox()->setNextLineBox(box->nextLineBox()); 124 125 checkConsistency(); 126 } 127 128 void RenderLineBoxList::deleteLineBoxes() 129 { 130 if (m_firstLineBox) { 131 InlineFlowBox* next; 132 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { 133 next = curr->nextLineBox(); 134 curr->destroy(); 135 } 136 m_firstLineBox = 0; 137 m_lastLineBox = 0; 138 } 139 } 140 141 void RenderLineBoxList::dirtyLineBoxes() 142 { 143 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) 144 curr->dirtyLineBoxes(); 145 } 146 147 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const 148 { 149 RenderBox* block; 150 if (renderer->isBox()) 151 block = toRenderBox(renderer); 152 else 153 block = renderer->containingBlock(); 154 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop); 155 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom); 156 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart); 157 physicalStart = std::min(physicalStart, physicalEnd); 158 159 if (renderer->style()->isHorizontalWritingMode()) { 160 physicalStart += offset.y(); 161 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y()) 162 return false; 163 } else { 164 physicalStart += offset.x(); 165 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x()) 166 return false; 167 } 168 169 return true; 170 } 171 172 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset) const 173 { 174 // We can check the first box and last box and avoid painting/hit testing if we don't 175 // intersect. This is a quick short-circuit that we can take to avoid walking any lines. 176 // FIXME: This check is flawed in the following extremely obscure way: 177 // if some line in the middle has a huge overflow, it might actually extend below the last line. 178 RootInlineBox& firstRootBox = firstLineBox()->root(); 179 RootInlineBox& lastRootBox = lastLineBox()->root(); 180 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop()); 181 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom()); 182 183 return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset); 184 } 185 186 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const 187 { 188 RootInlineBox& root = box->root(); 189 LayoutUnit logicalTop = std::min<LayoutUnit>(box->logicalTopVisualOverflow(root.lineTop()), root.selectionTop()); 190 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root.lineBottom()); 191 192 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset); 193 } 194 195 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const 196 { 197 if (hitTestAction != HitTestForeground) 198 return false; 199 200 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. 201 202 // If we have no lines then we have no work to do. 203 if (!firstLineBox()) 204 return false; 205 206 LayoutPoint point = locationInContainer.point(); 207 LayoutRect rect = firstLineBox()->isHorizontal() ? 208 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) : 209 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1); 210 211 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset)) 212 return false; 213 214 // See if our root lines contain the point. If so, then we hit test 215 // them further. Note that boxes can easily overlap, so we can't make any assumptions 216 // based off positions of our first line box or our last line box. 217 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { 218 RootInlineBox& root = curr->root(); 219 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) { 220 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom()); 221 if (inside) { 222 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); 223 return true; 224 } 225 } 226 } 227 228 return false; 229 } 230 231 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child) 232 { 233 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow()))) 234 return; 235 236 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0; 237 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox(); 238 239 // If we have no first line box, then just bail early. 240 if (!firstBox) { 241 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent 242 // is already dirty. 243 if (container->isInline() && !container->ancestorLineBoxDirty()) { 244 container->parent()->dirtyLinesFromChangedChild(container); 245 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 246 } 247 return; 248 } 249 250 // Try to figure out which line box we belong in. First try to find a previous 251 // line box by examining our siblings. If we didn't find a line box, then use our 252 // parent's first line box. 253 RootInlineBox* box = 0; 254 RenderObject* curr = 0; 255 ListHashSet<RenderObject*, 16> potentialLineBreakObjects; 256 potentialLineBreakObjects.add(child); 257 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) { 258 potentialLineBreakObjects.add(curr); 259 260 if (curr->isFloatingOrOutOfFlowPositioned()) 261 continue; 262 263 if (curr->isReplaced()) { 264 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper(); 265 if (wrapper) 266 box = &wrapper->root(); 267 } else if (curr->isText()) { 268 InlineTextBox* textBox = toRenderText(curr)->lastTextBox(); 269 if (textBox) 270 box = &textBox->root(); 271 } else if (curr->isRenderInline()) { 272 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling(); 273 if (lastSiblingBox) 274 box = &lastSiblingBox->root(); 275 } 276 277 if (box) 278 break; 279 } 280 if (!box) { 281 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) { 282 // https://bugs.webkit.org/show_bug.cgi?id=60778 283 // We may have just removed a <br> with no line box that was our first child. In this case 284 // we won't find a previous sibling, but firstBox can be pointing to a following sibling. 285 // This isn't good enough, since we won't locate the root line box that encloses the removed 286 // <br>. We have to just over-invalidate a bit and go up to our parent. 287 if (!inlineContainer->ancestorLineBoxDirty()) { 288 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer); 289 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 290 } 291 return; 292 } 293 box = &firstBox->root(); 294 } 295 296 // If we found a line box, then dirty it. 297 if (box) { 298 RootInlineBox* adjacentBox; 299 box->markDirty(); 300 301 // dirty the adjacent lines that might be affected 302 // NOTE: we dirty the previous line because RootInlineBox objects cache 303 // the address of the first object on the next line after a BR, which we may be 304 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren 305 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak, 306 // despite the name, actually returns the first RenderObject after the BR. 307 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize." 308 adjacentBox = box->prevRootBox(); 309 if (adjacentBox) 310 adjacentBox->markDirty(); 311 adjacentBox = box->nextRootBox(); 312 // If |child| or any of its immediately previous siblings with culled lineboxes is the object after a line-break in |box| or the linebox after it 313 // then that means |child| actually sits on the linebox after |box| (or is its line-break object) and so we need to dirty it as well. 314 if (adjacentBox && (potentialLineBreakObjects.contains(box->lineBreakObj()) || potentialLineBreakObjects.contains(adjacentBox->lineBreakObj()) || child->isBR() || isIsolated(container->style()->unicodeBidi()))) 315 adjacentBox->markDirty(); 316 } 317 } 318 319 #if ENABLE(ASSERT) 320 321 void RenderLineBoxList::checkConsistency() const 322 { 323 #ifdef CHECK_CONSISTENCY 324 const InlineFlowBox* prev = 0; 325 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) { 326 ASSERT(child->prevLineBox() == prev); 327 prev = child; 328 } 329 ASSERT(prev == m_lastLineBox); 330 #endif 331 } 332 333 #endif 334 335 } 336
