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