Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Adobe Systems Incorporated. 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 |
| 9 | * copyright notice, this list of conditions and the following |
| 10 | * disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above |
| 12 | * copyright notice, this list of conditions and the following |
| 13 | * disclaimer in the documentation and/or other materials |
| 14 | * provided with the distribution. |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 15 | * |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY |
| 17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE |
| 20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
| 21 | * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 23 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
| 25 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
| 26 | * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include "config.h" |
| 31 | |
| 32 | #include "core/rendering/RenderFlowThread.h" |
| 33 | |
| 34 | #include "core/dom/Node.h" |
| 35 | #include "core/platform/PODIntervalTree.h" |
| 36 | #include "core/platform/graphics/transforms/TransformState.h" |
| 37 | #include "core/rendering/FlowThreadController.h" |
| 38 | #include "core/rendering/HitTestRequest.h" |
| 39 | #include "core/rendering/HitTestResult.h" |
| 40 | #include "core/rendering/PaintInfo.h" |
| 41 | #include "core/rendering/RenderBoxRegionInfo.h" |
Torne (Richard Coles) | 93ac45c | 2013-05-29 14:40:20 +0100 | [diff] [blame] | 42 | #include "core/rendering/RenderInline.h" |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 43 | #include "core/rendering/RenderLayer.h" |
| 44 | #include "core/rendering/RenderRegion.h" |
| 45 | #include "core/rendering/RenderView.h" |
| 46 | |
| 47 | namespace WebCore { |
| 48 | |
| 49 | RenderFlowThread::RenderFlowThread() |
| 50 | : RenderBlock(0) |
Ben Murdoch | 591b958 | 2013-07-10 11:41:44 +0100 | [diff] [blame] | 51 | , m_previousRegionCount(0) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 52 | , m_autoLogicalHeightRegionsCount(0) |
| 53 | , m_regionsInvalidated(false) |
| 54 | , m_regionsHaveUniformLogicalWidth(true) |
| 55 | , m_regionsHaveUniformLogicalHeight(true) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 56 | , m_hasRegionsWithStyling(false) |
| 57 | , m_dispatchRegionLayoutUpdateEvent(false) |
Ben Murdoch | 591b958 | 2013-07-10 11:41:44 +0100 | [diff] [blame] | 58 | , m_dispatchRegionOversetChangeEvent(false) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 59 | , m_pageLogicalSizeChanged(false) |
| 60 | , m_inConstrainedLayoutPhase(false) |
| 61 | , m_needsTwoPhasesLayout(false) |
| 62 | { |
| 63 | setFlowThreadState(InsideOutOfFlowThread); |
| 64 | } |
| 65 | |
| 66 | PassRefPtr<RenderStyle> RenderFlowThread::createFlowThreadStyle(RenderStyle* parentStyle) |
| 67 | { |
| 68 | RefPtr<RenderStyle> newStyle(RenderStyle::create()); |
| 69 | newStyle->inheritFrom(parentStyle); |
| 70 | newStyle->setDisplay(BLOCK); |
| 71 | newStyle->setPosition(AbsolutePosition); |
| 72 | newStyle->setZIndex(0); |
| 73 | newStyle->setLeft(Length(0, Fixed)); |
| 74 | newStyle->setTop(Length(0, Fixed)); |
| 75 | newStyle->setWidth(Length(100, Percent)); |
| 76 | newStyle->setHeight(Length(100, Percent)); |
| 77 | newStyle->font().update(0); |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 78 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 79 | return newStyle.release(); |
| 80 | } |
| 81 | |
| 82 | void RenderFlowThread::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| 83 | { |
| 84 | RenderBlock::styleDidChange(diff, oldStyle); |
| 85 | |
| 86 | if (oldStyle && oldStyle->writingMode() != style()->writingMode()) |
Ben Murdoch | 3c9e4ae | 2013-08-12 14:20:44 +0100 | [diff] [blame^] | 87 | invalidateRegions(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | void RenderFlowThread::removeFlowChildInfo(RenderObject* child) |
| 91 | { |
| 92 | if (child->isBox()) |
| 93 | removeRenderBoxRegionInfo(toRenderBox(child)); |
| 94 | clearRenderObjectCustomStyle(child); |
| 95 | } |
| 96 | |
| 97 | void RenderFlowThread::addRegionToThread(RenderRegion* renderRegion) |
| 98 | { |
| 99 | ASSERT(renderRegion); |
| 100 | m_regionList.add(renderRegion); |
| 101 | renderRegion->setIsValid(true); |
| 102 | } |
| 103 | |
| 104 | void RenderFlowThread::removeRegionFromThread(RenderRegion* renderRegion) |
| 105 | { |
| 106 | ASSERT(renderRegion); |
| 107 | m_regionList.remove(renderRegion); |
| 108 | } |
| 109 | |
| 110 | void RenderFlowThread::invalidateRegions() |
| 111 | { |
| 112 | if (m_regionsInvalidated) { |
| 113 | ASSERT(selfNeedsLayout()); |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | m_regionRangeMap.clear(); |
| 118 | m_breakBeforeToRegionMap.clear(); |
| 119 | m_breakAfterToRegionMap.clear(); |
Ben Murdoch | 3c9e4ae | 2013-08-12 14:20:44 +0100 | [diff] [blame^] | 120 | setNeedsLayout(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 121 | |
| 122 | m_regionsInvalidated = true; |
| 123 | } |
| 124 | |
| 125 | class CurrentRenderFlowThreadDisabler { |
| 126 | WTF_MAKE_NONCOPYABLE(CurrentRenderFlowThreadDisabler); |
| 127 | public: |
| 128 | CurrentRenderFlowThreadDisabler(RenderView* view) |
| 129 | : m_view(view) |
| 130 | , m_renderFlowThread(0) |
| 131 | { |
| 132 | m_renderFlowThread = m_view->flowThreadController()->currentRenderFlowThread(); |
| 133 | if (m_renderFlowThread) |
| 134 | view->flowThreadController()->setCurrentRenderFlowThread(0); |
| 135 | } |
| 136 | ~CurrentRenderFlowThreadDisabler() |
| 137 | { |
| 138 | if (m_renderFlowThread) |
| 139 | m_view->flowThreadController()->setCurrentRenderFlowThread(m_renderFlowThread); |
| 140 | } |
| 141 | private: |
| 142 | RenderView* m_view; |
| 143 | RenderFlowThread* m_renderFlowThread; |
| 144 | }; |
| 145 | |
| 146 | void RenderFlowThread::validateRegions() |
| 147 | { |
| 148 | if (m_regionsInvalidated) { |
| 149 | m_regionsInvalidated = false; |
| 150 | m_regionsHaveUniformLogicalWidth = true; |
| 151 | m_regionsHaveUniformLogicalHeight = true; |
| 152 | |
| 153 | if (hasRegions()) { |
| 154 | LayoutUnit previousRegionLogicalWidth = 0; |
| 155 | LayoutUnit previousRegionLogicalHeight = 0; |
| 156 | bool firstRegionVisited = false; |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 157 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 158 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 159 | RenderRegion* region = *iter; |
| 160 | ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| 161 | |
| 162 | region->deleteAllRenderBoxRegionInfo(); |
| 163 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 164 | // In the normal layout phase we need to initialize the computedAutoHeight for auto-height regions. |
| 165 | // See initializeRegionsComputedAutoHeight for the explanation. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 166 | // Also, if we have auto-height regions we can't assume m_regionsHaveUniformLogicalHeight to be true in the first phase |
| 167 | // because the auto-height regions don't have their height computed yet. |
| 168 | if (!inConstrainedLayoutPhase() && region->hasAutoLogicalHeight()) { |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 169 | region->setComputedAutoHeight(region->maxPageLogicalHeight()); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 170 | m_regionsHaveUniformLogicalHeight = false; |
| 171 | } |
| 172 | |
| 173 | LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| 174 | LayoutUnit regionLogicalHeight = region->pageLogicalHeight(); |
| 175 | |
| 176 | if (!firstRegionVisited) |
| 177 | firstRegionVisited = true; |
| 178 | else { |
| 179 | if (m_regionsHaveUniformLogicalWidth && previousRegionLogicalWidth != regionLogicalWidth) |
| 180 | m_regionsHaveUniformLogicalWidth = false; |
| 181 | if (m_regionsHaveUniformLogicalHeight && previousRegionLogicalHeight != regionLogicalHeight) |
| 182 | m_regionsHaveUniformLogicalHeight = false; |
| 183 | } |
| 184 | |
| 185 | previousRegionLogicalWidth = regionLogicalWidth; |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | updateLogicalWidth(); // Called to get the maximum logical width for the region. |
| 191 | updateRegionsFlowThreadPortionRect(); |
| 192 | } |
| 193 | |
| 194 | void RenderFlowThread::layout() |
| 195 | { |
| 196 | StackStats::LayoutCheckPoint layoutCheckPoint; |
| 197 | |
| 198 | m_pageLogicalSizeChanged = m_regionsInvalidated && everHadLayout(); |
| 199 | |
| 200 | // In case this is the second pass of the normal phase we need to update the auto-height regions to their initial value. |
| 201 | // If the region chain was invalidated this will happen anyway. |
| 202 | if (!m_regionsInvalidated && !inConstrainedLayoutPhase()) |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 203 | initializeRegionsComputedAutoHeight(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 204 | |
| 205 | validateRegions(); |
| 206 | |
| 207 | // This is the first phase of the layout and because we have auto-height regions we'll need a second |
| 208 | // pass to update the flow with the computed auto-height regions. |
| 209 | m_needsTwoPhasesLayout = !inConstrainedLayoutPhase() && hasAutoLogicalHeightRegions(); |
| 210 | |
| 211 | CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this); |
| 212 | RenderBlock::layout(); |
| 213 | |
| 214 | m_pageLogicalSizeChanged = false; |
| 215 | |
| 216 | if (lastRegion()) |
| 217 | lastRegion()->expandToEncompassFlowThreadContentsIfNeeded(); |
| 218 | |
| 219 | if (shouldDispatchRegionLayoutUpdateEvent()) |
| 220 | dispatchRegionLayoutUpdateEvent(); |
Ben Murdoch | 591b958 | 2013-07-10 11:41:44 +0100 | [diff] [blame] | 221 | |
| 222 | if (shouldDispatchRegionOversetChangeEvent()) |
| 223 | dispatchRegionOversetChangeEvent(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | void RenderFlowThread::updateLogicalWidth() |
| 227 | { |
| 228 | LayoutUnit logicalWidth = initialLogicalWidth(); |
| 229 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 230 | RenderRegion* region = *iter; |
| 231 | ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| 232 | logicalWidth = max(region->pageLogicalWidth(), logicalWidth); |
| 233 | } |
| 234 | setLogicalWidth(logicalWidth); |
| 235 | |
| 236 | // If the regions have non-uniform logical widths, then insert inset information for the RenderFlowThread. |
| 237 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 238 | RenderRegion* region = *iter; |
| 239 | LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| 240 | if (regionLogicalWidth != logicalWidth) { |
| 241 | LayoutUnit logicalLeft = style()->direction() == LTR ? LayoutUnit() : logicalWidth - regionLogicalWidth; |
| 242 | region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth, false); |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | void RenderFlowThread::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const |
| 248 | { |
| 249 | computedValues.m_position = logicalTop; |
| 250 | computedValues.m_extent = 0; |
| 251 | |
| 252 | for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 253 | RenderRegion* region = *iter; |
| 254 | ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| 255 | |
| 256 | computedValues.m_extent += region->logicalHeightOfAllFlowThreadContent(); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | LayoutRect RenderFlowThread::computeRegionClippingRect(const LayoutPoint& offset, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect) const |
| 261 | { |
| 262 | LayoutRect regionClippingRect(offset + (flowThreadPortionOverflowRect.location() - flowThreadPortionRect.location()), flowThreadPortionOverflowRect.size()); |
| 263 | if (style()->isFlippedBlocksWritingMode()) |
| 264 | regionClippingRect.move(flowThreadPortionRect.size() - flowThreadPortionOverflowRect.size()); |
| 265 | return regionClippingRect; |
| 266 | } |
| 267 | |
Torne (Richard Coles) | 5267f70 | 2013-06-11 10:57:24 +0100 | [diff] [blame] | 268 | void RenderFlowThread::paintFlowThreadPortionInRegion(PaintInfo& paintInfo, RenderRegion* region, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect, const LayoutPoint& paintOffset) const |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 269 | { |
| 270 | GraphicsContext* context = paintInfo.context; |
| 271 | if (!context) |
| 272 | return; |
| 273 | |
| 274 | // RenderFlowThread should start painting its content in a position that is offset |
| 275 | // from the region rect's current position. The amount of offset is equal to the location of |
| 276 | // the flow thread portion in the flow thread's local coordinates. |
| 277 | // Note that we have to pixel snap the location at which we're going to paint, since this is necessary |
| 278 | // to minimize the amount of incorrect snapping that would otherwise occur. |
| 279 | // If we tried to paint by applying a non-integral translation, then all the |
| 280 | // layout code that attempted to pixel snap would be incorrect. |
| 281 | IntPoint adjustedPaintOffset; |
| 282 | LayoutPoint portionLocation; |
| 283 | if (style()->isFlippedBlocksWritingMode()) { |
| 284 | LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); |
| 285 | flipForWritingMode(flippedFlowThreadPortionRect); |
| 286 | portionLocation = flippedFlowThreadPortionRect.location(); |
| 287 | } else |
| 288 | portionLocation = flowThreadPortionRect.location(); |
| 289 | adjustedPaintOffset = roundedIntPoint(paintOffset - portionLocation); |
| 290 | |
| 291 | // The clipping rect for the region is set up by assuming the flowThreadPortionRect is going to paint offset from adjustedPaintOffset. |
| 292 | // Remember that we pixel snapped and moved the paintOffset and stored the snapped result in adjustedPaintOffset. Now we add back in |
| 293 | // the flowThreadPortionRect's location to get the spot where we expect the portion to actually paint. This can be non-integral and |
| 294 | // that's ok. We then pixel snap the resulting clipping rect to account for snapping that will occur when the flow thread paints. |
| 295 | IntRect regionClippingRect = pixelSnappedIntRect(computeRegionClippingRect(adjustedPaintOffset + portionLocation, flowThreadPortionRect, flowThreadPortionOverflowRect)); |
| 296 | |
| 297 | PaintInfo info(paintInfo); |
| 298 | info.rect.intersect(regionClippingRect); |
| 299 | |
| 300 | if (!info.rect.isEmpty()) { |
| 301 | context->save(); |
| 302 | |
| 303 | context->clip(regionClippingRect); |
| 304 | |
| 305 | context->translate(adjustedPaintOffset.x(), adjustedPaintOffset.y()); |
| 306 | info.rect.moveBy(-adjustedPaintOffset); |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 307 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 308 | layer()->paint(context, info.rect, 0, 0, region, RenderLayer::PaintLayerTemporaryClipRects); |
| 309 | |
| 310 | context->restore(); |
| 311 | } |
| 312 | } |
| 313 | |
Torne (Richard Coles) | 93ac45c | 2013-05-29 14:40:20 +0100 | [diff] [blame] | 314 | bool RenderFlowThread::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) |
| 315 | { |
| 316 | if (hitTestAction == HitTestBlockBackground) |
| 317 | return false; |
| 318 | return RenderBlock::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, hitTestAction); |
| 319 | } |
| 320 | |
Torne (Richard Coles) | 5267f70 | 2013-06-11 10:57:24 +0100 | [diff] [blame] | 321 | bool RenderFlowThread::hitTestFlowThreadPortionInRegion(RenderRegion* region, const LayoutRect& flowThreadPortionRect, const LayoutRect& flowThreadPortionOverflowRect, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset) const |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 322 | { |
| 323 | LayoutRect regionClippingRect = computeRegionClippingRect(accumulatedOffset, flowThreadPortionRect, flowThreadPortionOverflowRect); |
| 324 | if (!regionClippingRect.contains(locationInContainer.point())) |
| 325 | return false; |
| 326 | |
| 327 | LayoutSize renderFlowThreadOffset; |
| 328 | if (style()->isFlippedBlocksWritingMode()) { |
| 329 | LayoutRect flippedFlowThreadPortionRect(flowThreadPortionRect); |
| 330 | flipForWritingMode(flippedFlowThreadPortionRect); |
| 331 | renderFlowThreadOffset = accumulatedOffset - flippedFlowThreadPortionRect.location(); |
| 332 | } else |
| 333 | renderFlowThreadOffset = accumulatedOffset - flowThreadPortionRect.location(); |
| 334 | |
| 335 | // Always ignore clipping, since the RenderFlowThread has nothing to do with the bounds of the FrameView. |
| 336 | HitTestRequest newRequest(request.type() | HitTestRequest::IgnoreClipping | HitTestRequest::DisallowShadowContent); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 337 | |
| 338 | // Make a new temporary HitTestLocation in the new region. |
| 339 | HitTestLocation newHitTestLocation(locationInContainer, -renderFlowThreadOffset, region); |
| 340 | |
Torne (Richard Coles) | 93ac45c | 2013-05-29 14:40:20 +0100 | [diff] [blame] | 341 | bool isPointInsideFlowThread = layer()->hitTest(newRequest, newHitTestLocation, result); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 342 | |
| 343 | // FIXME: Should we set result.m_localPoint back to the RenderRegion's coordinate space or leave it in the RenderFlowThread's coordinate |
| 344 | // space? Right now it's staying in the RenderFlowThread's coordinate space, which may end up being ok. We will know more when we get around to |
| 345 | // patching positionForPoint. |
| 346 | return isPointInsideFlowThread; |
| 347 | } |
| 348 | |
| 349 | bool RenderFlowThread::shouldRepaint(const LayoutRect& r) const |
| 350 | { |
| 351 | if (view()->printing() || r.isEmpty()) |
| 352 | return false; |
| 353 | |
| 354 | return true; |
| 355 | } |
| 356 | |
| 357 | void RenderFlowThread::repaintRectangleInRegions(const LayoutRect& repaintRect) const |
| 358 | { |
| 359 | if (!shouldRepaint(repaintRect) || !hasValidRegionInfo()) |
| 360 | return; |
| 361 | |
| 362 | LayoutStateDisabler layoutStateDisabler(view()); // We can't use layout state to repaint, since the regions are somewhere else. |
| 363 | |
| 364 | // We can't use currentFlowThread as it is possible to have interleaved flow threads and the wrong one could be used. |
| 365 | // Let each region figure out the proper enclosing flow thread. |
| 366 | CurrentRenderFlowThreadDisabler disabler(view()); |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 367 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 368 | for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 369 | RenderRegion* region = *iter; |
| 370 | |
| 371 | region->repaintFlowThreadContent(repaintRect); |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | RenderRegion* RenderFlowThread::regionAtBlockOffset(LayoutUnit offset, bool extendLastRegion, RegionAutoGenerationPolicy autoGenerationPolicy) |
| 376 | { |
| 377 | ASSERT(!m_regionsInvalidated); |
| 378 | |
| 379 | if (autoGenerationPolicy == AllowRegionAutoGeneration) |
| 380 | autoGenerateRegionsToBlockOffset(offset); |
| 381 | |
| 382 | if (offset <= 0) |
| 383 | return m_regionList.isEmpty() ? 0 : m_regionList.first(); |
| 384 | |
| 385 | RegionSearchAdapter adapter(offset); |
| 386 | m_regionIntervalTree.allOverlapsWithAdapter<RegionSearchAdapter>(adapter); |
| 387 | |
| 388 | // If no region was found, the offset is in the flow thread overflow. |
| 389 | // The last region will contain the offset if extendLastRegion is set or if the last region is a set. |
| 390 | if (!adapter.result() && !m_regionList.isEmpty() && (extendLastRegion || m_regionList.last()->isRenderRegionSet())) |
| 391 | return m_regionList.last(); |
| 392 | |
| 393 | return adapter.result(); |
| 394 | } |
| 395 | |
Torne (Richard Coles) | 93ac45c | 2013-05-29 14:40:20 +0100 | [diff] [blame] | 396 | LayoutPoint RenderFlowThread::adjustedPositionRelativeToOffsetParent(const RenderBoxModelObject& boxModelObject, const LayoutPoint& startPoint) |
| 397 | { |
| 398 | LayoutPoint referencePoint = startPoint; |
| 399 | |
| 400 | // FIXME: This needs to be adapted for different writing modes inside the flow thread. |
| 401 | RenderRegion* startRegion = regionAtBlockOffset(referencePoint.y()); |
| 402 | if (startRegion) { |
| 403 | // Take into account the offset coordinates of the region. |
| 404 | RenderObject* currObject = startRegion; |
| 405 | RenderObject* currOffsetParentRenderer; |
| 406 | Element* currOffsetParentElement; |
| 407 | while ((currOffsetParentElement = currObject->offsetParent()) && (currOffsetParentRenderer = currOffsetParentElement->renderer())) { |
| 408 | if (currObject->isBoxModelObject()) |
| 409 | referencePoint.move(toRenderBoxModelObject(currObject)->offsetLeft(), toRenderBoxModelObject(currObject)->offsetTop()); |
| 410 | |
| 411 | // Since we're looking for the offset relative to the body, we must also |
| 412 | // take into consideration the borders of the region's offsetParent. |
| 413 | if (currOffsetParentRenderer->isBox() && !currOffsetParentRenderer->isBody()) |
| 414 | referencePoint.move(toRenderBox(currOffsetParentRenderer)->borderLeft(), toRenderBox(currOffsetParentRenderer)->borderTop()); |
| 415 | |
| 416 | currObject = currOffsetParentRenderer; |
| 417 | } |
| 418 | |
| 419 | // We need to check if any of this box's containing blocks start in a different region |
| 420 | // and if so, drop the object's top position (which was computed relative to its containing block |
| 421 | // and is no longer valid) and recompute it using the region in which it flows as reference. |
| 422 | bool wasComputedRelativeToOtherRegion = false; |
| 423 | const RenderBlock* objContainingBlock = boxModelObject.containingBlock(); |
| 424 | while (objContainingBlock && !objContainingBlock->isRenderNamedFlowThread()) { |
| 425 | // Check if this object is in a different region. |
| 426 | RenderRegion* parentStartRegion = 0; |
| 427 | RenderRegion* parentEndRegion = 0; |
| 428 | getRegionRangeForBox(objContainingBlock, parentStartRegion, parentEndRegion); |
| 429 | if (parentStartRegion && parentStartRegion != startRegion) { |
| 430 | wasComputedRelativeToOtherRegion = true; |
| 431 | break; |
| 432 | } |
| 433 | objContainingBlock = objContainingBlock->containingBlock(); |
| 434 | } |
| 435 | |
| 436 | if (wasComputedRelativeToOtherRegion) { |
| 437 | if (boxModelObject.isBox()) { |
| 438 | // Use borderBoxRectInRegion to account for variations such as percentage margins. |
| 439 | LayoutRect borderBoxRect = toRenderBox(&boxModelObject)->borderBoxRectInRegion(startRegion, 0, RenderBox::DoNotCacheRenderBoxRegionInfo); |
| 440 | referencePoint.move(borderBoxRect.location().x(), 0); |
| 441 | } |
| 442 | |
| 443 | // Get the logical top coordinate of the current object. |
| 444 | LayoutUnit top = 0; |
| 445 | if (boxModelObject.isRenderBlock()) |
| 446 | top = toRenderBlock(&boxModelObject)->offsetFromLogicalTopOfFirstPage(); |
| 447 | else { |
| 448 | if (boxModelObject.containingBlock()) |
| 449 | top = boxModelObject.containingBlock()->offsetFromLogicalTopOfFirstPage(); |
| 450 | |
| 451 | if (boxModelObject.isBox()) |
| 452 | top += toRenderBox(&boxModelObject)->topLeftLocation().y(); |
| 453 | else if (boxModelObject.isRenderInline()) |
| 454 | top -= toRenderInline(&boxModelObject)->borderTop(); |
| 455 | } |
| 456 | |
| 457 | // Get the logical top of the region this object starts in |
| 458 | // and compute the object's top, relative to the region's top. |
| 459 | LayoutUnit regionLogicalTop = startRegion->pageLogicalTopForOffset(top); |
| 460 | LayoutUnit topRelativeToRegion = top - regionLogicalTop; |
| 461 | referencePoint.setY(startRegion->offsetTop() + topRelativeToRegion); |
| 462 | |
| 463 | // Since the top has been overriden, check if the |
| 464 | // relative/sticky positioning must be reconsidered. |
| 465 | if (boxModelObject.isRelPositioned()) |
| 466 | referencePoint.move(0, boxModelObject.relativePositionOffset().height()); |
| 467 | else if (boxModelObject.isStickyPositioned()) |
| 468 | referencePoint.move(0, boxModelObject.stickyPositionOffset().height()); |
| 469 | } |
| 470 | |
| 471 | // Since we're looking for the offset relative to the body, we must also |
| 472 | // take into consideration the borders of the region. |
| 473 | referencePoint.move(startRegion->borderLeft(), startRegion->borderTop()); |
| 474 | } |
| 475 | |
| 476 | return referencePoint; |
| 477 | } |
| 478 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 479 | LayoutUnit RenderFlowThread::pageLogicalTopForOffset(LayoutUnit offset) |
| 480 | { |
| 481 | RenderRegion* region = regionAtBlockOffset(offset); |
| 482 | return region ? region->pageLogicalTopForOffset(offset) : LayoutUnit(); |
| 483 | } |
| 484 | |
| 485 | LayoutUnit RenderFlowThread::pageLogicalWidthForOffset(LayoutUnit offset) |
| 486 | { |
| 487 | RenderRegion* region = regionAtBlockOffset(offset, true); |
| 488 | return region ? region->pageLogicalWidth() : contentLogicalWidth(); |
| 489 | } |
| 490 | |
| 491 | LayoutUnit RenderFlowThread::pageLogicalHeightForOffset(LayoutUnit offset) |
| 492 | { |
| 493 | RenderRegion* region = regionAtBlockOffset(offset); |
| 494 | if (!region) |
| 495 | return 0; |
| 496 | |
| 497 | return region->pageLogicalHeight(); |
| 498 | } |
| 499 | |
| 500 | LayoutUnit RenderFlowThread::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule) |
| 501 | { |
| 502 | RenderRegion* region = regionAtBlockOffset(offset); |
| 503 | if (!region) |
| 504 | return 0; |
| 505 | |
| 506 | LayoutUnit pageLogicalTop = region->pageLogicalTopForOffset(offset); |
| 507 | LayoutUnit pageLogicalHeight = region->pageLogicalHeight(); |
| 508 | LayoutUnit pageLogicalBottom = pageLogicalTop + pageLogicalHeight; |
| 509 | LayoutUnit remainingHeight = pageLogicalBottom - offset; |
| 510 | if (pageBoundaryRule == IncludePageBoundary) { |
| 511 | // If IncludePageBoundary is set, the line exactly on the top edge of a |
| 512 | // region will act as being part of the previous region. |
| 513 | remainingHeight = intMod(remainingHeight, pageLogicalHeight); |
| 514 | } |
| 515 | return remainingHeight; |
| 516 | } |
| 517 | |
| 518 | RenderRegion* RenderFlowThread::mapFromFlowToRegion(TransformState& transformState) const |
| 519 | { |
| 520 | if (!hasValidRegionInfo()) |
| 521 | return 0; |
| 522 | |
| 523 | LayoutRect boxRect = transformState.mappedQuad().enclosingBoundingBox(); |
| 524 | flipForWritingMode(boxRect); |
| 525 | |
| 526 | // FIXME: We need to refactor RenderObject::absoluteQuads to be able to split the quads across regions, |
| 527 | // for now we just take the center of the mapped enclosing box and map it to a region. |
| 528 | // Note: Using the center in order to avoid rounding errors. |
| 529 | |
| 530 | LayoutPoint center = boxRect.center(); |
| 531 | RenderRegion* renderRegion = const_cast<RenderFlowThread*>(this)->regionAtBlockOffset(isHorizontalWritingMode() ? center.y() : center.x(), true, DisallowRegionAutoGeneration); |
| 532 | if (!renderRegion) |
| 533 | return 0; |
| 534 | |
| 535 | LayoutRect flippedRegionRect(renderRegion->flowThreadPortionRect()); |
| 536 | flipForWritingMode(flippedRegionRect); |
| 537 | |
| 538 | transformState.move(renderRegion->contentBoxRect().location() - flippedRegionRect.location()); |
| 539 | |
| 540 | return renderRegion; |
| 541 | } |
| 542 | |
| 543 | void RenderFlowThread::removeRenderBoxRegionInfo(RenderBox* box) |
| 544 | { |
| 545 | if (!hasRegions()) |
| 546 | return; |
| 547 | |
| 548 | // If the region chain was invalidated the next layout will clear the box information from all the regions. |
| 549 | if (m_regionsInvalidated) { |
| 550 | ASSERT(selfNeedsLayout()); |
| 551 | return; |
| 552 | } |
| 553 | |
| 554 | RenderRegion* startRegion; |
| 555 | RenderRegion* endRegion; |
| 556 | getRegionRangeForBox(box, startRegion, endRegion); |
| 557 | |
| 558 | for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) { |
| 559 | RenderRegion* region = *iter; |
| 560 | region->removeRenderBoxRegionInfo(box); |
| 561 | if (region == endRegion) |
| 562 | break; |
| 563 | } |
| 564 | |
| 565 | #ifndef NDEBUG |
| 566 | // We have to make sure we did not leave any RenderBoxRegionInfo attached. |
| 567 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 568 | RenderRegion* region = *iter; |
| 569 | ASSERT(!region->renderBoxRegionInfo(box)); |
| 570 | } |
| 571 | #endif |
| 572 | |
| 573 | m_regionRangeMap.remove(box); |
| 574 | } |
| 575 | |
| 576 | bool RenderFlowThread::logicalWidthChangedInRegions(const RenderBlock* block, LayoutUnit offsetFromLogicalTopOfFirstPage) |
| 577 | { |
| 578 | if (!hasRegions()) |
| 579 | return false; |
| 580 | |
| 581 | RenderRegion* startRegion; |
| 582 | RenderRegion* endRegion; |
| 583 | getRegionRangeForBox(block, startRegion, endRegion); |
| 584 | |
| 585 | // When the region chain is invalidated the box information is discarded so we must assume the width has changed. |
| 586 | if (m_pageLogicalSizeChanged && !startRegion) |
| 587 | return true; |
| 588 | |
| 589 | // Not necessary for the flow thread, since we already computed the correct info for it. |
| 590 | if (block == this) |
| 591 | return false; |
| 592 | |
| 593 | for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) { |
| 594 | RenderRegion* region = *iter; |
| 595 | ASSERT(!region->needsLayout() || region->isRenderRegionSet()); |
| 596 | |
| 597 | OwnPtr<RenderBoxRegionInfo> oldInfo = region->takeRenderBoxRegionInfo(block); |
| 598 | if (!oldInfo) |
| 599 | continue; |
| 600 | |
| 601 | LayoutUnit oldLogicalWidth = oldInfo->logicalWidth(); |
| 602 | RenderBoxRegionInfo* newInfo = block->renderBoxRegionInfo(region, offsetFromLogicalTopOfFirstPage); |
| 603 | if (!newInfo || newInfo->logicalWidth() != oldLogicalWidth) |
| 604 | return true; |
| 605 | |
| 606 | if (region == endRegion) |
| 607 | break; |
| 608 | } |
| 609 | |
| 610 | return false; |
| 611 | } |
| 612 | |
| 613 | LayoutUnit RenderFlowThread::contentLogicalWidthOfFirstRegion() const |
| 614 | { |
| 615 | RenderRegion* firstValidRegionInFlow = firstRegion(); |
| 616 | if (!firstValidRegionInFlow) |
| 617 | return 0; |
| 618 | return isHorizontalWritingMode() ? firstValidRegionInFlow->contentWidth() : firstValidRegionInFlow->contentHeight(); |
| 619 | } |
| 620 | |
| 621 | LayoutUnit RenderFlowThread::contentLogicalHeightOfFirstRegion() const |
| 622 | { |
| 623 | RenderRegion* firstValidRegionInFlow = firstRegion(); |
| 624 | if (!firstValidRegionInFlow) |
| 625 | return 0; |
| 626 | return isHorizontalWritingMode() ? firstValidRegionInFlow->contentHeight() : firstValidRegionInFlow->contentWidth(); |
| 627 | } |
| 628 | |
| 629 | LayoutUnit RenderFlowThread::contentLogicalLeftOfFirstRegion() const |
| 630 | { |
| 631 | RenderRegion* firstValidRegionInFlow = firstRegion(); |
| 632 | if (!firstValidRegionInFlow) |
| 633 | return 0; |
| 634 | return isHorizontalWritingMode() ? firstValidRegionInFlow->flowThreadPortionRect().x() : firstValidRegionInFlow->flowThreadPortionRect().y(); |
| 635 | } |
| 636 | |
| 637 | RenderRegion* RenderFlowThread::firstRegion() const |
| 638 | { |
| 639 | if (!hasValidRegionInfo()) |
| 640 | return 0; |
| 641 | return m_regionList.first(); |
| 642 | } |
| 643 | |
| 644 | RenderRegion* RenderFlowThread::lastRegion() const |
| 645 | { |
| 646 | if (!hasValidRegionInfo()) |
| 647 | return 0; |
| 648 | return m_regionList.last(); |
| 649 | } |
| 650 | |
| 651 | void RenderFlowThread::clearRenderObjectCustomStyle(const RenderObject* object, |
| 652 | const RenderRegion* oldStartRegion, const RenderRegion* oldEndRegion, |
| 653 | const RenderRegion* newStartRegion, const RenderRegion* newEndRegion) |
| 654 | { |
| 655 | // Clear the styles for the object in the regions. |
| 656 | // The styles are not cleared for the regions that are contained in both ranges. |
| 657 | bool insideOldRegionRange = false; |
| 658 | bool insideNewRegionRange = false; |
| 659 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 660 | RenderRegion* region = *iter; |
| 661 | |
| 662 | if (oldStartRegion == region) |
| 663 | insideOldRegionRange = true; |
| 664 | if (newStartRegion == region) |
| 665 | insideNewRegionRange = true; |
| 666 | |
| 667 | if (!(insideOldRegionRange && insideNewRegionRange)) |
| 668 | region->clearObjectStyleInRegion(object); |
| 669 | |
| 670 | if (oldEndRegion == region) |
| 671 | insideOldRegionRange = false; |
| 672 | if (newEndRegion == region) |
| 673 | insideNewRegionRange = false; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | void RenderFlowThread::setRegionRangeForBox(const RenderBox* box, LayoutUnit offsetFromLogicalTopOfFirstPage) |
| 678 | { |
| 679 | if (!hasRegions()) |
| 680 | return; |
| 681 | |
| 682 | // FIXME: Not right for differing writing-modes. |
| 683 | RenderRegion* startRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstPage, true); |
| 684 | RenderRegion* endRegion = regionAtBlockOffset(offsetFromLogicalTopOfFirstPage + box->logicalHeight(), true); |
| 685 | RenderRegionRangeMap::iterator it = m_regionRangeMap.find(box); |
| 686 | if (it == m_regionRangeMap.end()) { |
| 687 | m_regionRangeMap.set(box, RenderRegionRange(startRegion, endRegion)); |
| 688 | clearRenderObjectCustomStyle(box); |
| 689 | return; |
| 690 | } |
| 691 | |
| 692 | // If nothing changed, just bail. |
| 693 | RenderRegionRange& range = it->value; |
| 694 | if (range.startRegion() == startRegion && range.endRegion() == endRegion) |
| 695 | return; |
| 696 | |
| 697 | // Delete any info that we find before our new startRegion and after our new endRegion. |
| 698 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 699 | RenderRegion* region = *iter; |
| 700 | if (region == startRegion) { |
| 701 | iter = m_regionList.find(endRegion); |
| 702 | continue; |
| 703 | } |
| 704 | |
| 705 | region->removeRenderBoxRegionInfo(box); |
| 706 | |
| 707 | if (region == range.endRegion()) |
| 708 | break; |
| 709 | } |
| 710 | |
| 711 | clearRenderObjectCustomStyle(box, range.startRegion(), range.endRegion(), startRegion, endRegion); |
| 712 | range.setRange(startRegion, endRegion); |
| 713 | } |
| 714 | |
| 715 | void RenderFlowThread::getRegionRangeForBox(const RenderBox* box, RenderRegion*& startRegion, RenderRegion*& endRegion) const |
| 716 | { |
| 717 | startRegion = 0; |
| 718 | endRegion = 0; |
| 719 | RenderRegionRangeMap::const_iterator it = m_regionRangeMap.find(box); |
| 720 | if (it == m_regionRangeMap.end()) |
| 721 | return; |
| 722 | |
| 723 | const RenderRegionRange& range = it->value; |
| 724 | startRegion = range.startRegion(); |
| 725 | endRegion = range.endRegion(); |
| 726 | ASSERT(m_regionList.contains(startRegion) && m_regionList.contains(endRegion)); |
| 727 | } |
| 728 | |
| 729 | void RenderFlowThread::applyBreakAfterContent(LayoutUnit clientHeight) |
| 730 | { |
| 731 | // Simulate a region break at height. If it points inside an auto logical height region, |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 732 | // then it may determine the region computed autoheight. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 733 | addForcedRegionBreak(clientHeight, this, false); |
| 734 | } |
| 735 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 736 | bool RenderFlowThread::regionInRange(const RenderRegion* targetRegion, const RenderRegion* startRegion, const RenderRegion* endRegion) const |
| 737 | { |
| 738 | ASSERT(targetRegion); |
| 739 | |
| 740 | for (RenderRegionList::const_iterator it = m_regionList.find(const_cast<RenderRegion*>(startRegion)); it != m_regionList.end(); ++it) { |
| 741 | const RenderRegion* currRegion = *it; |
| 742 | if (targetRegion == currRegion) |
| 743 | return true; |
| 744 | if (currRegion == endRegion) |
| 745 | break; |
| 746 | } |
| 747 | |
| 748 | return false; |
| 749 | } |
| 750 | |
| 751 | // Check if the content is flown into at least a region with region styling rules. |
| 752 | void RenderFlowThread::checkRegionsWithStyling() |
| 753 | { |
| 754 | bool hasRegionsWithStyling = false; |
| 755 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 756 | RenderRegion* region = *iter; |
| 757 | if (region->hasCustomRegionStyle()) { |
| 758 | hasRegionsWithStyling = true; |
| 759 | break; |
| 760 | } |
| 761 | } |
| 762 | m_hasRegionsWithStyling = hasRegionsWithStyling; |
| 763 | } |
| 764 | |
| 765 | bool RenderFlowThread::objectInFlowRegion(const RenderObject* object, const RenderRegion* region) const |
| 766 | { |
| 767 | ASSERT(object); |
| 768 | ASSERT(region); |
| 769 | |
| 770 | RenderFlowThread* flowThread = object->flowThreadContainingBlock(); |
| 771 | if (flowThread != this) |
| 772 | return false; |
| 773 | if (!m_regionList.contains(const_cast<RenderRegion*>(region))) |
| 774 | return false; |
| 775 | |
| 776 | RenderBox* enclosingBox = object->enclosingBox(); |
| 777 | RenderRegion* enclosingBoxStartRegion = 0; |
| 778 | RenderRegion* enclosingBoxEndRegion = 0; |
| 779 | getRegionRangeForBox(enclosingBox, enclosingBoxStartRegion, enclosingBoxEndRegion); |
| 780 | if (!regionInRange(region, enclosingBoxStartRegion, enclosingBoxEndRegion)) |
| 781 | return false; |
| 782 | |
| 783 | if (object->isBox()) |
| 784 | return true; |
| 785 | |
| 786 | LayoutRect objectABBRect = object->absoluteBoundingBoxRect(true); |
| 787 | if (!objectABBRect.width()) |
| 788 | objectABBRect.setWidth(1); |
| 789 | if (!objectABBRect.height()) |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 790 | objectABBRect.setHeight(1); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 791 | if (objectABBRect.intersects(region->absoluteBoundingBoxRect(true))) |
| 792 | return true; |
| 793 | |
| 794 | if (region == lastRegion()) { |
| 795 | // If the object does not intersect any of the enclosing box regions |
| 796 | // then the object is in last region. |
| 797 | for (RenderRegionList::const_iterator it = m_regionList.find(enclosingBoxStartRegion); it != m_regionList.end(); ++it) { |
| 798 | const RenderRegion* currRegion = *it; |
| 799 | if (currRegion == region) |
| 800 | break; |
| 801 | if (objectABBRect.intersects(currRegion->absoluteBoundingBoxRect(true))) |
| 802 | return false; |
| 803 | } |
| 804 | return true; |
| 805 | } |
| 806 | |
| 807 | return false; |
| 808 | } |
| 809 | |
| 810 | #ifndef NDEBUG |
| 811 | bool RenderFlowThread::isAutoLogicalHeightRegionsCountConsistent() const |
| 812 | { |
| 813 | unsigned autoLogicalHeightRegions = 0; |
| 814 | for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 815 | const RenderRegion* region = *iter; |
| 816 | if (region->hasAutoLogicalHeight()) |
| 817 | autoLogicalHeightRegions++; |
| 818 | } |
| 819 | |
| 820 | return autoLogicalHeightRegions == m_autoLogicalHeightRegionsCount; |
| 821 | } |
| 822 | #endif |
| 823 | |
| 824 | // During the normal layout phase of the named flow the regions are initialized with a height equal to their max-height. |
| 825 | // This way unforced breaks are automatically placed when a region is full and the content height/position correctly estimated. |
| 826 | // Also, the region where a forced break falls is exactly the region found at the forced break offset inside the flow content. |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 827 | void RenderFlowThread::initializeRegionsComputedAutoHeight(RenderRegion* startRegion) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 828 | { |
| 829 | ASSERT(!inConstrainedLayoutPhase()); |
| 830 | if (!hasAutoLogicalHeightRegions()) |
| 831 | return; |
| 832 | |
| 833 | RenderRegionList::iterator regionIter = startRegion ? m_regionList.find(startRegion) : m_regionList.begin(); |
| 834 | for (; regionIter != m_regionList.end(); ++regionIter) { |
| 835 | RenderRegion* region = *regionIter; |
| 836 | if (region->hasAutoLogicalHeight()) |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 837 | region->setComputedAutoHeight(region->maxPageLogicalHeight()); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 838 | } |
| 839 | } |
| 840 | |
| 841 | void RenderFlowThread::markAutoLogicalHeightRegionsForLayout() |
| 842 | { |
| 843 | ASSERT(hasAutoLogicalHeightRegions()); |
| 844 | |
| 845 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 846 | RenderRegion* region = *iter; |
| 847 | if (!region->hasAutoLogicalHeight()) |
| 848 | continue; |
| 849 | |
| 850 | // FIXME: We need to find a way to avoid marking all the regions ancestors for layout |
| 851 | // as we are already inside layout. |
Ben Murdoch | 3c9e4ae | 2013-08-12 14:20:44 +0100 | [diff] [blame^] | 852 | region->setNeedsLayout(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 853 | } |
| 854 | } |
| 855 | |
| 856 | void RenderFlowThread::updateRegionsFlowThreadPortionRect(const RenderRegion* lastRegionWithContent) |
| 857 | { |
| 858 | ASSERT(!lastRegionWithContent || (!inConstrainedLayoutPhase() && hasAutoLogicalHeightRegions())); |
| 859 | LayoutUnit logicalHeight = 0; |
| 860 | bool emptyRegionsSegment = false; |
| 861 | // FIXME: Optimize not to clear the interval all the time. This implies manually managing the tree nodes lifecycle. |
| 862 | m_regionIntervalTree.clear(); |
| 863 | m_regionIntervalTree.initIfNeeded(); |
| 864 | for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 865 | RenderRegion* region = *iter; |
| 866 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 867 | // If we find an empty auto-height region, clear the computedAutoHeight value. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 868 | if (emptyRegionsSegment && region->hasAutoLogicalHeight()) |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 869 | region->clearComputedAutoHeight(); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 870 | |
| 871 | LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); |
| 872 | LayoutUnit regionLogicalHeight = std::min<LayoutUnit>(LayoutUnit::max() / 2 - logicalHeight, region->logicalHeightOfAllFlowThreadContent()); |
| 873 | |
| 874 | LayoutRect regionRect(style()->direction() == LTR ? LayoutUnit() : logicalWidth() - regionLogicalWidth, logicalHeight, regionLogicalWidth, regionLogicalHeight); |
| 875 | |
| 876 | region->setFlowThreadPortionRect(isHorizontalWritingMode() ? regionRect : regionRect.transposedRect()); |
| 877 | |
| 878 | m_regionIntervalTree.add(RegionIntervalTree::createInterval(logicalHeight, logicalHeight + regionLogicalHeight, region)); |
| 879 | |
| 880 | logicalHeight += regionLogicalHeight; |
| 881 | |
| 882 | // Once we find the last region with content the next regions are considered empty. |
| 883 | if (lastRegionWithContent == region) |
| 884 | emptyRegionsSegment = true; |
| 885 | } |
| 886 | |
| 887 | ASSERT(!lastRegionWithContent || emptyRegionsSegment); |
| 888 | } |
| 889 | |
| 890 | // Even if we require the break to occur at offsetBreakInFlowThread, because regions may have min/max-height values, |
| 891 | // it is possible that the break will occur at a different offset than the original one required. |
| 892 | // offsetBreakAdjustment measures the different between the requested break offset and the current break offset. |
| 893 | bool RenderFlowThread::addForcedRegionBreak(LayoutUnit offsetBreakInFlowThread, RenderObject* breakChild, bool isBefore, LayoutUnit* offsetBreakAdjustment) |
| 894 | { |
| 895 | // We take breaks into account for height computation for auto logical height regions |
| 896 | // only in the layout phase in which we lay out the flows threads unconstrained |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 897 | // and we use the content breaks to determine the computedAutoHeight for |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 898 | // auto logical height regions. |
| 899 | if (inConstrainedLayoutPhase()) |
| 900 | return false; |
| 901 | |
| 902 | // Breaks can come before or after some objects. We need to track these objects, so that if we get |
| 903 | // multiple breaks for the same object (for example because of multiple layouts on the same object), |
| 904 | // we need to invalidate every other region after the old one and start computing from fresh. |
| 905 | RenderObjectToRegionMap& mapToUse = isBefore ? m_breakBeforeToRegionMap : m_breakAfterToRegionMap; |
| 906 | RenderObjectToRegionMap::iterator iter = mapToUse.find(breakChild); |
| 907 | if (iter != mapToUse.end()) { |
| 908 | RenderRegionList::iterator regionIter = m_regionList.find(iter->value); |
| 909 | ASSERT(regionIter != m_regionList.end()); |
| 910 | ASSERT((*regionIter)->hasAutoLogicalHeight()); |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 911 | initializeRegionsComputedAutoHeight(*regionIter); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 912 | |
| 913 | // We need to update the regions flow thread portion rect because we are going to process |
| 914 | // a break on these regions. |
| 915 | updateRegionsFlowThreadPortionRect(); |
| 916 | } |
| 917 | |
| 918 | // Simulate a region break at offsetBreakInFlowThread. If it points inside an auto logical height region, |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 919 | // then it determines the region computed auto height. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 920 | RenderRegion* region = regionAtBlockOffset(offsetBreakInFlowThread); |
| 921 | if (!region) |
| 922 | return false; |
| 923 | |
| 924 | bool lastBreakAfterContent = breakChild == this; |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 925 | bool hasComputedAutoHeight = false; |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 926 | |
| 927 | LayoutUnit currentRegionOffsetInFlowThread = isHorizontalWritingMode() ? region->flowThreadPortionRect().y() : region->flowThreadPortionRect().x(); |
| 928 | LayoutUnit offsetBreakInCurrentRegion = offsetBreakInFlowThread - currentRegionOffsetInFlowThread; |
| 929 | |
| 930 | if (region->hasAutoLogicalHeight()) { |
| 931 | // A forced break can appear only in an auto-height region that didn't have a forced break before. |
| 932 | // This ASSERT is a good-enough heuristic to verify the above condition. |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 933 | ASSERT(region->maxPageLogicalHeight() == region->computedAutoHeight()); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 934 | |
| 935 | mapToUse.set(breakChild, region); |
| 936 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 937 | hasComputedAutoHeight = true; |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 938 | |
| 939 | // Compute the region height pretending that the offsetBreakInCurrentRegion is the logicalHeight for the auto-height region. |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 940 | LayoutUnit regionComputedAutoHeight = region->constrainContentBoxLogicalHeightByMinMax(offsetBreakInCurrentRegion, -1); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 941 | |
| 942 | // The new height of this region needs to be smaller than the initial value, the max height. A forced break is the only way to change the initial |
| 943 | // height of an auto-height region besides content ending. |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 944 | ASSERT(regionComputedAutoHeight <= region->maxPageLogicalHeight()); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 945 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 946 | region->setComputedAutoHeight(regionComputedAutoHeight); |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 947 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 948 | currentRegionOffsetInFlowThread += regionComputedAutoHeight; |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 949 | } else |
| 950 | currentRegionOffsetInFlowThread += isHorizontalWritingMode() ? region->flowThreadPortionRect().height() : region->flowThreadPortionRect().width(); |
| 951 | |
| 952 | // If the break was found inside an auto-height region its size changed so we need to recompute the flow thread portion rectangles. |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 953 | // Also, if this is the last break after the content we need to clear the computedAutoHeight value on the last empty regions. |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 954 | if (hasAutoLogicalHeightRegions() && lastBreakAfterContent) |
| 955 | updateRegionsFlowThreadPortionRect(region); |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 956 | else if (hasComputedAutoHeight) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 957 | updateRegionsFlowThreadPortionRect(); |
| 958 | |
| 959 | if (offsetBreakAdjustment) |
| 960 | *offsetBreakAdjustment = max<LayoutUnit>(0, currentRegionOffsetInFlowThread - offsetBreakInFlowThread); |
| 961 | |
Torne (Richard Coles) | f5e4ad5 | 2013-08-05 13:57:57 +0100 | [diff] [blame] | 962 | return hasComputedAutoHeight; |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | void RenderFlowThread::incrementAutoLogicalHeightRegions() |
| 966 | { |
| 967 | if (!m_autoLogicalHeightRegionsCount) |
| 968 | view()->flowThreadController()->incrementFlowThreadsWithAutoLogicalHeightRegions(); |
| 969 | ++m_autoLogicalHeightRegionsCount; |
| 970 | } |
| 971 | |
| 972 | void RenderFlowThread::decrementAutoLogicalHeightRegions() |
| 973 | { |
| 974 | ASSERT(m_autoLogicalHeightRegionsCount > 0); |
| 975 | --m_autoLogicalHeightRegionsCount; |
| 976 | if (!m_autoLogicalHeightRegionsCount) |
| 977 | view()->flowThreadController()->decrementFlowThreadsWithAutoLogicalHeightRegions(); |
| 978 | } |
| 979 | |
| 980 | void RenderFlowThread::collectLayerFragments(LayerFragments& layerFragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) |
| 981 | { |
| 982 | ASSERT(!m_regionsInvalidated); |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 983 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 984 | for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 985 | RenderRegion* region = *iter; |
| 986 | region->collectLayerFragments(layerFragments, layerBoundingBox, dirtyRect); |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | LayoutRect RenderFlowThread::fragmentsBoundingBox(const LayoutRect& layerBoundingBox) |
| 991 | { |
| 992 | ASSERT(!m_regionsInvalidated); |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 993 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 994 | LayoutRect result; |
| 995 | for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { |
| 996 | RenderRegion* region = *iter; |
| 997 | LayerFragments fragments; |
| 998 | region->collectLayerFragments(fragments, layerBoundingBox, PaintInfo::infiniteRect()); |
| 999 | for (size_t i = 0; i < fragments.size(); ++i) { |
| 1000 | const LayerFragment& fragment = fragments.at(i); |
| 1001 | LayoutRect fragmentRect(layerBoundingBox); |
| 1002 | fragmentRect.intersect(fragment.paginationClip); |
| 1003 | fragmentRect.moveBy(fragment.paginationOffset); |
| 1004 | result.unite(fragmentRect); |
| 1005 | } |
| 1006 | } |
Ben Murdoch | 02772c6 | 2013-07-26 10:21:05 +0100 | [diff] [blame] | 1007 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1008 | return result; |
| 1009 | } |
| 1010 | |
| 1011 | void RenderFlowThread::RegionSearchAdapter::collectIfNeeded(const RegionInterval& interval) |
| 1012 | { |
| 1013 | if (m_result) |
| 1014 | return; |
| 1015 | if (interval.low() <= m_offset && interval.high() > m_offset) |
| 1016 | m_result = interval.data(); |
| 1017 | } |
| 1018 | |
Torne (Richard Coles) | 521d96e | 2013-06-19 11:58:24 +0100 | [diff] [blame] | 1019 | void RenderFlowThread::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const |
| 1020 | { |
| 1021 | if (this == repaintContainer) |
| 1022 | return; |
| 1023 | |
| 1024 | if (RenderRegion* region = mapFromFlowToRegion(transformState)) { |
| 1025 | // FIXME: The cast below is probably not the best solution, we may need to find a better way. |
| 1026 | static_cast<const RenderObject*>(region)->mapLocalToContainer(region->containerForRepaint(), transformState, mode, wasFixed); |
| 1027 | } |
| 1028 | } |
| 1029 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1030 | CurrentRenderFlowThreadMaintainer::CurrentRenderFlowThreadMaintainer(RenderFlowThread* renderFlowThread) |
| 1031 | : m_renderFlowThread(renderFlowThread) |
| 1032 | , m_previousRenderFlowThread(0) |
| 1033 | { |
| 1034 | if (!m_renderFlowThread) |
| 1035 | return; |
| 1036 | RenderView* view = m_renderFlowThread->view(); |
| 1037 | m_previousRenderFlowThread = view->flowThreadController()->currentRenderFlowThread(); |
| 1038 | ASSERT(!m_previousRenderFlowThread || !renderFlowThread->isRenderNamedFlowThread()); |
| 1039 | view->flowThreadController()->setCurrentRenderFlowThread(m_renderFlowThread); |
| 1040 | } |
| 1041 | |
| 1042 | CurrentRenderFlowThreadMaintainer::~CurrentRenderFlowThreadMaintainer() |
| 1043 | { |
| 1044 | if (!m_renderFlowThread) |
| 1045 | return; |
| 1046 | RenderView* view = m_renderFlowThread->view(); |
| 1047 | ASSERT(view->flowThreadController()->currentRenderFlowThread() == m_renderFlowThread); |
| 1048 | view->flowThreadController()->setCurrentRenderFlowThread(m_previousRenderFlowThread); |
| 1049 | } |
| 1050 | |
| 1051 | |
| 1052 | } // namespace WebCore |