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 "HitTestResult.h" 33 #include "InlineTextBox.h" 34 #include "PaintInfo.h" 35 #include "RenderArena.h" 36 #include "RenderInline.h" 37 #include "RenderView.h" 38 #include "RootInlineBox.h" 39 40 using namespace std; 41 42 namespace WebCore { 43 44 #ifndef NDEBUG 45 RenderLineBoxList::~RenderLineBoxList() 46 { 47 ASSERT(!m_firstLineBox); 48 ASSERT(!m_lastLineBox); 49 } 50 #endif 51 52 void RenderLineBoxList::appendLineBox(InlineFlowBox* box) 53 { 54 checkConsistency(); 55 56 if (!m_firstLineBox) 57 m_firstLineBox = m_lastLineBox = box; 58 else { 59 m_lastLineBox->setNextLineBox(box); 60 box->setPreviousLineBox(m_lastLineBox); 61 m_lastLineBox = box; 62 } 63 64 checkConsistency(); 65 } 66 67 void RenderLineBoxList::deleteLineBoxTree(RenderArena* arena) 68 { 69 InlineFlowBox* line = m_firstLineBox; 70 InlineFlowBox* nextLine; 71 while (line) { 72 nextLine = line->nextLineBox(); 73 line->deleteLine(arena); 74 line = nextLine; 75 } 76 m_firstLineBox = m_lastLineBox = 0; 77 } 78 79 void RenderLineBoxList::extractLineBox(InlineFlowBox* box) 80 { 81 checkConsistency(); 82 83 m_lastLineBox = box->prevLineBox(); 84 if (box == m_firstLineBox) 85 m_firstLineBox = 0; 86 if (box->prevLineBox()) 87 box->prevLineBox()->setNextLineBox(0); 88 box->setPreviousLineBox(0); 89 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) 90 curr->setExtracted(); 91 92 checkConsistency(); 93 } 94 95 void RenderLineBoxList::attachLineBox(InlineFlowBox* box) 96 { 97 checkConsistency(); 98 99 if (m_lastLineBox) { 100 m_lastLineBox->setNextLineBox(box); 101 box->setPreviousLineBox(m_lastLineBox); 102 } else 103 m_firstLineBox = box; 104 InlineFlowBox* last = box; 105 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) { 106 curr->setExtracted(false); 107 last = curr; 108 } 109 m_lastLineBox = last; 110 111 checkConsistency(); 112 } 113 114 void RenderLineBoxList::removeLineBox(InlineFlowBox* box) 115 { 116 checkConsistency(); 117 118 if (box == m_firstLineBox) 119 m_firstLineBox = box->nextLineBox(); 120 if (box == m_lastLineBox) 121 m_lastLineBox = box->prevLineBox(); 122 if (box->nextLineBox()) 123 box->nextLineBox()->setPreviousLineBox(box->prevLineBox()); 124 if (box->prevLineBox()) 125 box->prevLineBox()->setNextLineBox(box->nextLineBox()); 126 127 checkConsistency(); 128 } 129 130 void RenderLineBoxList::deleteLineBoxes(RenderArena* arena) 131 { 132 if (m_firstLineBox) { 133 InlineFlowBox* next; 134 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { 135 next = curr->nextLineBox(); 136 curr->destroy(arena); 137 } 138 m_firstLineBox = 0; 139 m_lastLineBox = 0; 140 } 141 } 142 143 void RenderLineBoxList::dirtyLineBoxes() 144 { 145 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) 146 curr->dirtyLineBoxes(); 147 } 148 149 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, int logicalTop, int logicalBottom, const IntRect& rect, int tx, int ty) const 150 { 151 RenderBox* block; 152 if (renderer->isBox()) 153 block = toRenderBox(renderer); 154 else 155 block = renderer->containingBlock(); 156 int physicalStart = block->flipForWritingMode(logicalTop); 157 int physicalEnd = block->flipForWritingMode(logicalBottom); 158 int physicalExtent = abs(physicalEnd - physicalStart); 159 physicalStart = min(physicalStart, physicalEnd); 160 161 if (renderer->style()->isHorizontalWritingMode()) { 162 physicalStart += ty; 163 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y()) 164 return false; 165 } else { 166 physicalStart += tx; 167 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x()) 168 return false; 169 } 170 171 return true; 172 } 173 174 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const IntRect& rect, int tx, int ty, bool usePrintRect, int outlineSize) const 175 { 176 // We can check the first box and last box and avoid painting/hit testing if we don't 177 // intersect. This is a quick short-circuit that we can take to avoid walking any lines. 178 // FIXME: This check is flawed in the following extremely obscure way: 179 // if some line in the middle has a huge overflow, it might actually extend below the last line. 180 RootInlineBox* firstRootBox = firstLineBox()->root(); 181 RootInlineBox* lastRootBox = lastLineBox()->root(); 182 int firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox->lineTop()); 183 if (usePrintRect && !firstLineBox()->parent()) 184 firstLineTop = min(firstLineTop, firstLineBox()->root()->lineTop()); 185 int lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox->lineBottom()); 186 if (usePrintRect && !lastLineBox()->parent()) 187 lastLineBottom = max(lastLineBottom, lastLineBox()->root()->lineBottom()); 188 int logicalTop = firstLineTop - outlineSize; 189 int logicalBottom = outlineSize + lastLineBottom; 190 191 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, rect, tx, ty); 192 } 193 194 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, int tx, int ty) const 195 { 196 RootInlineBox* root = box->root(); 197 int logicalTop = min(box->logicalTopVisualOverflow(root->lineTop()), root->selectionTop()) - renderer->maximalOutlineSize(paintInfo.phase); 198 int logicalBottom = box->logicalBottomVisualOverflow(root->lineBottom()) + renderer->maximalOutlineSize(paintInfo.phase); 199 200 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, tx, ty); 201 } 202 203 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, int tx, int ty) const 204 { 205 // Only paint during the foreground/selection phases. 206 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline 207 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip 208 && paintInfo.phase != PaintPhaseMask) 209 return; 210 211 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer. 212 213 // If we have no lines then we have no work to do. 214 if (!firstLineBox()) 215 return; 216 217 // FIXME: Paint-time pagination is obsolete and is now only used by embedded WebViews inside AppKit 218 // NSViews. Do not add any more code for this. 219 RenderView* v = renderer->view(); 220 bool usePrintRect = !v->printRect().isEmpty(); 221 int outlineSize = renderer->maximalOutlineSize(paintInfo.phase); 222 if (!anyLineIntersectsRect(renderer, paintInfo.rect, tx, ty, usePrintRect, outlineSize)) 223 return; 224 225 PaintInfo info(paintInfo); 226 ListHashSet<RenderInline*> outlineObjects; 227 info.outlineObjects = &outlineObjects; 228 229 // See if our root lines intersect with the dirty rect. If so, then we paint 230 // them. Note that boxes can easily overlap, so we can't make any assumptions 231 // based off positions of our first line box or our last line box. 232 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { 233 if (usePrintRect) { 234 // FIXME: This is the deprecated pagination model that is still needed 235 // for embedded views inside AppKit. AppKit is incapable of paginating vertical 236 // text pages, so we don't have to deal with vertical lines at all here. 237 RootInlineBox* root = curr->root(); 238 int topForPaginationCheck = curr->logicalTopVisualOverflow(root->lineTop()); 239 int bottomForPaginationCheck = curr->logicalLeftVisualOverflow(); 240 if (!curr->parent()) { 241 // We're a root box. Use lineTop and lineBottom as well here. 242 topForPaginationCheck = min(topForPaginationCheck, root->lineTop()); 243 bottomForPaginationCheck = max(bottomForPaginationCheck, root->lineBottom()); 244 } 245 if (bottomForPaginationCheck - topForPaginationCheck <= v->printRect().height()) { 246 if (ty + bottomForPaginationCheck > v->printRect().maxY()) { 247 if (RootInlineBox* nextRootBox = curr->root()->nextRootBox()) 248 bottomForPaginationCheck = min(bottomForPaginationCheck, min(nextRootBox->logicalTopVisualOverflow(), nextRootBox->lineTop())); 249 } 250 if (ty + bottomForPaginationCheck > v->printRect().maxY()) { 251 if (ty + topForPaginationCheck < v->truncatedAt()) 252 v->setBestTruncatedAt(ty + topForPaginationCheck, renderer); 253 // If we were able to truncate, don't paint. 254 if (ty + topForPaginationCheck >= v->truncatedAt()) 255 break; 256 } 257 } 258 } 259 260 if (lineIntersectsDirtyRect(renderer, curr, info, tx, ty)) { 261 RootInlineBox* root = curr->root(); 262 curr->paint(info, tx, ty, root->lineTop(), root->lineBottom()); 263 } 264 } 265 266 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) { 267 ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end(); 268 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) { 269 RenderInline* flow = *it; 270 flow->paintOutline(info.context, tx, ty); 271 } 272 info.outlineObjects->clear(); 273 } 274 } 275 276 277 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) const 278 { 279 if (hitTestAction != HitTestForeground) 280 return false; 281 282 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. 283 284 // If we have no lines then we have no work to do. 285 if (!firstLineBox()) 286 return false; 287 288 bool isHorizontal = firstLineBox()->isHorizontal(); 289 290 int logicalPointStart = isHorizontal ? y - result.topPadding() : x - result.leftPadding(); 291 int logicalPointEnd = (isHorizontal ? y + result.bottomPadding() : x + result.rightPadding()) + 1; 292 IntRect rect(isHorizontal ? x : logicalPointStart, isHorizontal ? logicalPointStart : y, 293 isHorizontal ? 1 : logicalPointEnd - logicalPointStart, 294 isHorizontal ? logicalPointEnd - logicalPointStart : 1); 295 if (!anyLineIntersectsRect(renderer, rect, tx, ty)) 296 return false; 297 298 // See if our root lines contain the point. If so, then we hit test 299 // them further. Note that boxes can easily overlap, so we can't make any assumptions 300 // based off positions of our first line box or our last line box. 301 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { 302 RootInlineBox* root = curr->root(); 303 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root->lineTop()), curr->logicalBottomVisualOverflow(root->lineBottom()), rect, tx, ty)) { 304 bool inside = curr->nodeAtPoint(request, result, x, y, tx, ty, root->lineTop(), root->lineBottom()); 305 if (inside) { 306 renderer->updateHitTestResult(result, IntPoint(x - tx, y - ty)); 307 return true; 308 } 309 } 310 } 311 312 return false; 313 } 314 315 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child) 316 { 317 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow()))) 318 return; 319 320 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0; 321 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox(); 322 323 // If we have no first line box, then just bail early. 324 if (!firstBox) { 325 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent 326 // is already dirty. 327 if (container->isInline() && !container->parent()->selfNeedsLayout()) 328 container->parent()->dirtyLinesFromChangedChild(container); 329 return; 330 } 331 332 // Try to figure out which line box we belong in. First try to find a previous 333 // line box by examining our siblings. If we didn't find a line box, then use our 334 // parent's first line box. 335 RootInlineBox* box = 0; 336 RenderObject* curr = 0; 337 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) { 338 if (curr->isFloatingOrPositioned()) 339 continue; 340 341 if (curr->isReplaced()) { 342 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper(); 343 if (wrapper) 344 box = wrapper->root(); 345 } else if (curr->isText()) { 346 InlineTextBox* textBox = toRenderText(curr)->lastTextBox(); 347 if (textBox) 348 box = textBox->root(); 349 } else if (curr->isRenderInline()) { 350 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling(); 351 if (lastSiblingBox) 352 box = lastSiblingBox->root(); 353 } 354 355 if (box) 356 break; 357 } 358 if (!box) 359 box = firstBox->root(); 360 361 // If we found a line box, then dirty it. 362 if (box) { 363 RootInlineBox* adjacentBox; 364 box->markDirty(); 365 366 // dirty the adjacent lines that might be affected 367 // NOTE: we dirty the previous line because RootInlineBox objects cache 368 // the address of the first object on the next line after a BR, which we may be 369 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren 370 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak, 371 // despite the name, actually returns the first RenderObject after the BR. 372 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize." 373 adjacentBox = box->prevRootBox(); 374 if (adjacentBox) 375 adjacentBox->markDirty(); 376 adjacentBox = box->nextRootBox(); 377 if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR()))) 378 adjacentBox->markDirty(); 379 } 380 } 381 382 #ifndef NDEBUG 383 384 void RenderLineBoxList::checkConsistency() const 385 { 386 #ifdef CHECK_CONSISTENCY 387 const InlineFlowBox* prev = 0; 388 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) { 389 ASSERT(child->prevLineBox() == prev); 390 prev = child; 391 } 392 ASSERT(prev == m_lastLineBox); 393 #endif 394 } 395 396 #endif 397 398 } 399
