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

   1 /*
   2  * Copyright (C) 2009 Google 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 are
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   7  *
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32
  33 #include "core/layout/LayoutRubyBase.h"
  34
  35 #include "core/layout/LayoutRubyRun.h"
  36
  37 namespace blink {
  38
  39 LayoutRubyBase::LayoutRubyBase()
  40     : LayoutBlockFlow(nullptr)
  41 {
  42     setInline(false);
  43 }
  44
  45 LayoutRubyBase::~LayoutRubyBase()
  46 {
  47 }
  48
  49 LayoutRubyBase* LayoutRubyBase::createAnonymous(Document* document)
  50 {
  51     LayoutRubyBase* layoutObject = new LayoutRubyBase();
  52     layoutObject->setDocumentForAnonymous(document);
  53     return layoutObject;
  54 }
  55
  56 bool LayoutRubyBase::isChildAllowed(LayoutObject* child, const ComputedStyle&) const
  57 {
  58     return child->isInline();
  59 }
  60
  61 void LayoutRubyBase::moveChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
  62 {
  63     // This function removes all children that are before (!) beforeChild
  64     // and appends them to toBase.
  65     ASSERT_ARG(toBase, toBase);
  66
  67     if (beforeChild && beforeChild->parent() != this)
  68         beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
  69
  70     if (childrenInline())
  71         moveInlineChildren(toBase, beforeChild);
  72     else
  73         moveBlockChildren(toBase, beforeChild);
  74
  75     setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Unknown);
  76     toBase->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Unknown);
  77 }
  78
  79 void LayoutRubyBase::moveInlineChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
  80 {
  81     ASSERT(childrenInline());
  82     ASSERT_ARG(toBase, toBase);
  83
  84     if (!firstChild())
  85         return;
  86
  87     LayoutBlock* toBlock;
  88     if (toBase->childrenInline()) {
  89         // The standard and easy case: move the children into the target base
  90         toBlock = toBase;
  91     } else {
  92         // We need to wrap the inline objects into an anonymous block.
  93         // If toBase has a suitable block, we re-use it, otherwise create a new one.
  94         LayoutObject* lastChild = toBase->lastChild();
  95         if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline()) {
  96             toBlock = toLayoutBlock(lastChild);
  97         } else {
  98             toBlock = toBase->createAnonymousBlock();
  99             toBase->children()->appendChildNode(toBase, toBlock);
 100         }
 101     }
 102     // Move our inline children into the target block we determined above.
 103     moveChildrenTo(toBlock, firstChild(), beforeChild);
 104 }
 105
 106 void LayoutRubyBase::moveBlockChildren(LayoutRubyBase* toBase, LayoutObject* beforeChild)
 107 {
 108     ASSERT(!childrenInline());
 109     ASSERT_ARG(toBase, toBase);
 110
 111     if (!firstChild())
 112         return;
 113
 114     if (toBase->childrenInline())
 115         toBase->makeChildrenNonInline();
 116
 117     // If an anonymous block would be put next to another such block, then merge those.
 118     LayoutObject* firstChildHere = firstChild();
 119     LayoutObject* lastChildThere = toBase->lastChild();
 120     if (firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline()
 121         && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) {
 122         LayoutBlock* anonBlockHere = toLayoutBlock(firstChildHere);
 123         LayoutBlock* anonBlockThere = toLayoutBlock(lastChildThere);
 124         anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
 125         anonBlockHere->deleteLineBoxTree();
 126         anonBlockHere->destroy();
 127     }
 128     // Move all remaining children normally.
 129     moveChildrenTo(toBase, firstChild(), beforeChild);
 130 }
 131
 132 ETextAlign LayoutRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
 133 {
 134     return JUSTIFY;
 135 }
 136
 137 void LayoutRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, LayoutUnit& logicalLeft, LayoutUnit& logicalWidth) const
 138 {
 139     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
 140     if (maxPreferredLogicalWidth >= logicalWidth)
 141         return;
 142
 143     unsigned maxCount = static_cast<unsigned>(LayoutUnit::max().floor());
 144     if (expansionOpportunityCount > maxCount)
 145         expansionOpportunityCount = maxCount;
 146
 147     // Inset the ruby base by half the inter-ideograph expansion amount.
 148     LayoutUnit inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
 149
 150     logicalLeft += inset / 2;
 151     logicalWidth -= inset;
 152 }
 153
 154 } // namespace blink