third_party/WebKit/Source/core/layout/LayoutTableRow.cpp

   1 /*
   2  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
   3  *           (C) 1997 Torben Weis (weis@kde.org)
   4  *           (C) 1998 Waldo Bastian (bastian@kde.org)
   5  *           (C) 1999 Lars Knoll (knoll@kde.org)
   6  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   7  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Library General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Library General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Library General Public License
  20  * along with this library; see the file COPYING.LIB.  If not, write to
  21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22  * Boston, MA 02110-1301, USA.
  23  */
  24
  25 #include "config.h"
  26 #include "core/layout/LayoutTableRow.h"
  27
  28 #include "core/HTMLNames.h"
  29 #include "core/fetch/ImageResource.h"
  30 #include "core/layout/HitTestResult.h"
  31 #include "core/layout/LayoutAnalyzer.h"
  32 #include "core/layout/LayoutTableCell.h"
  33 #include "core/layout/LayoutView.h"
  34 #include "core/layout/SubtreeLayoutScope.h"
  35 #include "core/paint/TableRowPainter.h"
  36 #include "core/style/StyleInheritedData.h"
  37
  38 namespace blink {
  39
  40 using namespace HTMLNames;
  41
  42 LayoutTableRow::LayoutTableRow(Element* element)
  43     : LayoutBox(element)
  44     , m_rowIndex(unsetRowIndex)
  45 {
  46     // init LayoutObject attributes
  47     setInline(false); // our object is not Inline
  48 }
  49
  50 void LayoutTableRow::willBeRemovedFromTree()
  51 {
  52     LayoutBox::willBeRemovedFromTree();
  53
  54     section()->setNeedsCellRecalc();
  55 }
  56
  57 static bool borderWidthChanged(const ComputedStyle* oldStyle, const ComputedStyle* newStyle)
  58 {
  59     return oldStyle->borderLeftWidth() != newStyle->borderLeftWidth()
  60         || oldStyle->borderTopWidth() != newStyle->borderTopWidth()
  61         || oldStyle->borderRightWidth() != newStyle->borderRightWidth()
  62         || oldStyle->borderBottomWidth() != newStyle->borderBottomWidth();
  63 }
  64
  65 void LayoutTableRow::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
  66 {
  67     ASSERT(style()->display() == TABLE_ROW);
  68
  69     LayoutBox::styleDidChange(diff, oldStyle);
  70     propagateStyleToAnonymousChildren();
  71
  72     if (section() && oldStyle && style()->logicalHeight() != oldStyle->logicalHeight())
  73         section()->rowLogicalHeightChanged(this);
  74
  75     // If border was changed, notify table.
  76     if (parent()) {
  77         LayoutTable* table = this->table();
  78         if (table && !table->selfNeedsLayout() && !table->normalChildNeedsLayout() && oldStyle && oldStyle->border() != style()->border())
  79             table->invalidateCollapsedBorders();
  80
  81         if (table && oldStyle && diff.needsFullLayout() && needsLayout() && table->collapseBorders() && borderWidthChanged(oldStyle, style())) {
  82             // If the border width changes on a row, we need to make sure the cells in the row know to lay out again.
  83             // This only happens when borders are collapsed, since they end up affecting the border sides of the cell
  84             // itself.
  85             for (LayoutBox* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) {
  86                 if (!childBox->isTableCell())
  87                     continue;
  88                 childBox->setChildNeedsLayout();
  89             }
  90         }
  91     }
  92 }
  93
  94 const BorderValue& LayoutTableRow::borderAdjoiningStartCell(const LayoutTableCell* cell) const
  95 {
  96     ASSERT_UNUSED(cell, cell->isFirstOrLastCellInRow());
  97     // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
  98     return style()->borderStart();
  99 }
 100
 101 const BorderValue& LayoutTableRow::borderAdjoiningEndCell(const LayoutTableCell* cell) const
 102 {
 103     ASSERT_UNUSED(cell, cell->isFirstOrLastCellInRow());
 104     // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
 105     return style()->borderEnd();
 106 }
 107
 108 void LayoutTableRow::addChild(LayoutObject* child, LayoutObject* beforeChild)
 109 {
 110     if (!child->isTableCell()) {
 111         LayoutObject* last = beforeChild;
 112         if (!last)
 113             last = lastCell();
 114         if (last && last->isAnonymous() && last->isTableCell() && !last->isBeforeOrAfterContent()) {
 115             LayoutTableCell* lastCell = toLayoutTableCell(last);
 116             if (beforeChild == lastCell)
 117                 beforeChild = lastCell->firstChild();
 118             lastCell->addChild(child, beforeChild);
 119             return;
 120         }
 121
 122         if (beforeChild && !beforeChild->isAnonymous() && beforeChild->parent() == this) {
 123             LayoutObject* cell = beforeChild->previousSibling();
 124             if (cell && cell->isTableCell() && cell->isAnonymous()) {
 125                 cell->addChild(child);
 126                 return;
 127             }
 128         }
 129
 130         // If beforeChild is inside an anonymous cell, insert into the cell.
 131         if (last && !last->isTableCell() && last->parent() && last->parent()->isAnonymous() && !last->parent()->isBeforeOrAfterContent()) {
 132             last->parent()->addChild(child, beforeChild);
 133             return;
 134         }
 135
 136         LayoutTableCell* cell = LayoutTableCell::createAnonymousWithParent(this);
 137         addChild(cell, beforeChild);
 138         cell->addChild(child);
 139         return;
 140     }
 141
 142     if (beforeChild && beforeChild->parent() != this)
 143         beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
 144
 145     LayoutTableCell* cell = toLayoutTableCell(child);
 146
 147     // Generated content can result in us having a null section so make sure to null check our parent.
 148     if (parent())
 149         section()->addCell(cell, this);
 150
 151     ASSERT(!beforeChild || beforeChild->isTableCell());
 152     LayoutBox::addChild(cell, beforeChild);
 153
 154     if (beforeChild || nextRow())
 155         section()->setNeedsCellRecalc();
 156 }
 157
 158 void LayoutTableRow::layout()
 159 {
 160     ASSERT(needsLayout());
 161     LayoutAnalyzer::Scope analyzer(*this);
 162
 163     // Table rows do not add translation.
 164     LayoutState state(*this, LayoutSize());
 165
 166     for (LayoutTableCell* cell = firstCell(); cell; cell = cell->nextCell()) {
 167         SubtreeLayoutScope layouter(*cell);
 168         if (!cell->needsLayout())
 169             cell->markForPaginationRelayoutIfNeeded(layouter);
 170         if (cell->needsLayout())
 171             cell->layout();
 172     }
 173
 174     m_overflow.clear();
 175     addVisualEffectOverflow();
 176     // We do not call addOverflowFromCell here. The cell are laid out to be
 177     // measured above and will be sized correctly in a follow-up phase.
 178
 179     // We only ever need to issue paint invalidations if our cells didn't, which means that they didn't need
 180     // layout, so we know that our bounds didn't change. This code is just making up for
 181     // the fact that we did not invalidate paints in setStyle() because we had a layout hint.
 182     if (selfNeedsLayout()) {
 183         for (LayoutTableCell* cell = firstCell(); cell; cell = cell->nextCell()) {
 184             // FIXME: Is this needed when issuing paint invalidations after layout?
 185             cell->setShouldDoFullPaintInvalidation();
 186         }
 187     }
 188
 189     // LayoutTableSection::layoutRows will set our logical height and width later, so it calls updateLayerTransform().
 190     clearNeedsLayout();
 191 }
 192
 193 // Hit Testing
 194 bool LayoutTableRow::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
 195 {
 196     // Table rows cannot ever be hit tested.  Effectively they do not exist.
 197     // Just forward to our children always.
 198     for (LayoutTableCell* cell = lastCell(); cell; cell = cell->previousCell()) {
 199         // FIXME: We have to skip over inline flows, since they can show up inside table rows
 200         // at the moment (a demoted inline <form> for example). If we ever implement a
 201         // table-specific hit-test method (which we should do for performance reasons anyway),
 202         // then we can remove this check.
 203         if (!cell->hasSelfPaintingLayer()) {
 204             LayoutPoint cellPoint = flipForWritingModeForChild(cell, accumulatedOffset);
 205             if (cell->nodeAtPoint(result, locationInContainer, cellPoint, action)) {
 206                 updateHitTestResult(result, locationInContainer.point() - toLayoutSize(cellPoint));
 207                 return true;
 208             }
 209         }
 210     }
 211
 212     return false;
 213 }
 214
 215 void LayoutTableRow::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 216 {
 217     TableRowPainter(*this).paint(paintInfo, paintOffset);
 218 }
 219
 220 void LayoutTableRow::imageChanged(WrappedImagePtr, const IntRect*)
 221 {
 222     // FIXME: Examine cells and issue paint invalidations of only the rect the image paints in.
 223     setShouldDoFullPaintInvalidation();
 224 }
 225
 226 LayoutTableRow* LayoutTableRow::createAnonymous(Document* document)
 227 {
 228     LayoutTableRow* layoutObject = new LayoutTableRow(nullptr);
 229     layoutObject->setDocumentForAnonymous(document);
 230     return layoutObject;
 231 }
 232
 233 LayoutTableRow* LayoutTableRow::createAnonymousWithParent(const LayoutObject* parent)
 234 {
 235     LayoutTableRow* newRow = LayoutTableRow::createAnonymous(&parent->document());
 236     RefPtr<ComputedStyle> newStyle = ComputedStyle::createAnonymousStyleWithDisplay(parent->styleRef(), TABLE_ROW);
 237     newRow->setStyle(newStyle.release());
 238     return newRow;
 239 }
 240
 241 void LayoutTableRow::addOverflowFromCell(const LayoutTableCell* cell)
 242 {
 243     // Non-row-spanning-cells don't create overflow (they are fully contained within this row).
 244     if (cell->rowSpan() == 1)
 245         return;
 246
 247     // Cells only generates visual overflow.
 248     LayoutRect cellVisualOverflowRect = cell->visualOverflowRectForPropagation(styleRef());
 249
 250     // The cell and the row share the section's coordinate system. However
 251     // the visual overflow should be determined in the coordinate system of
 252     // the row, that's why we shift it below.
 253     LayoutUnit cellOffsetLogicalTopDifference = cell->location().y() - location().y();
 254     cellVisualOverflowRect.move(0, cellOffsetLogicalTopDifference);
 255
 256     addVisualOverflow(cellVisualOverflowRect);
 257 }
 258
 259 } // namespace blink