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      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
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      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/rendering/RenderRubyBase.h"
     34 #include "core/rendering/RenderRubyRun.h"
     35 
     36 using namespace std;
     37 
     38 namespace WebCore {
     39 
     40 RenderRubyBase::RenderRubyBase()
     41     : RenderBlockFlow(0)
     42 {
     43     setInline(false);
     44 }
     45 
     46 RenderRubyBase::~RenderRubyBase()
     47 {
     48 }
     49 
     50 RenderRubyBase* RenderRubyBase::createAnonymous(Document* document)
     51 {
     52     RenderRubyBase* renderer = new RenderRubyBase();
     53     renderer->setDocumentForAnonymous(document);
     54     return renderer;
     55 }
     56 
     57 bool RenderRubyBase::isChildAllowed(RenderObject* child, RenderStyle*) const
     58 {
     59     return child->isInline();
     60 }
     61 
     62 void RenderRubyBase::moveChildren(RenderRubyBase* toBase, RenderObject* beforeChild)
     63 {
     64     // This function removes all children that are before (!) beforeChild
     65     // and appends them to toBase.
     66     ASSERT_ARG(toBase, toBase);
     67 
     68     if (beforeChild && beforeChild->parent() != this)
     69         beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
     70 
     71     if (childrenInline())
     72         moveInlineChildren(toBase, beforeChild);
     73     else
     74         moveBlockChildren(toBase, beforeChild);
     75 
     76     setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
     77     toBase->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
     78 }
     79 
     80 void RenderRubyBase::moveInlineChildren(RenderRubyBase* toBase, RenderObject* beforeChild)
     81 {
     82     ASSERT(childrenInline());
     83     ASSERT_ARG(toBase, toBase);
     84 
     85     if (!firstChild())
     86         return;
     87 
     88     RenderBlock* toBlock;
     89     if (toBase->childrenInline()) {
     90         // The standard and easy case: move the children into the target base
     91         toBlock = toBase;
     92     } else {
     93         // We need to wrap the inline objects into an anonymous block.
     94         // If toBase has a suitable block, we re-use it, otherwise create a new one.
     95         RenderObject* lastChild = toBase->lastChild();
     96         if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline())
     97             toBlock = toRenderBlock(lastChild);
     98         else {
     99             toBlock = toBase->createAnonymousBlock();
    100             toBase->children()->appendChildNode(toBase, toBlock);
    101         }
    102     }
    103     // Move our inline children into the target block we determined above.
    104     moveChildrenTo(toBlock, firstChild(), beforeChild);
    105 }
    106 
    107 void RenderRubyBase::moveBlockChildren(RenderRubyBase* toBase, RenderObject* beforeChild)
    108 {
    109     ASSERT(!childrenInline());
    110     ASSERT_ARG(toBase, toBase);
    111 
    112     if (!firstChild())
    113         return;
    114 
    115     if (toBase->childrenInline())
    116         toBase->makeChildrenNonInline();
    117 
    118     // If an anonymous block would be put next to another such block, then merge those.
    119     RenderObject* firstChildHere = firstChild();
    120     RenderObject* lastChildThere = toBase->lastChild();
    121     if (firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline()
    122             && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) {
    123         RenderBlock* anonBlockHere = toRenderBlock(firstChildHere);
    124         RenderBlock* anonBlockThere = toRenderBlock(lastChildThere);
    125         anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
    126         anonBlockHere->deleteLineBoxTree();
    127         anonBlockHere->destroy();
    128     }
    129     // Move all remaining children normally.
    130     moveChildrenTo(toBase, firstChild(), beforeChild);
    131 }
    132 
    133 ETextAlign RenderRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
    134 {
    135     return JUSTIFY;
    136 }
    137 
    138 void RenderRubyBase::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
    139 {
    140     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
    141     if (maxPreferredLogicalWidth >= logicalWidth)
    142         return;
    143 
    144     // Inset the ruby base by half the inter-ideograph expansion amount.
    145     float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
    146 
    147     logicalLeft += inset / 2;
    148     logicalWidth -= inset;
    149 }
    150 
    151 } // namespace WebCore
    152