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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  * Copyright (C) 2011 Apple Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "config.h"
     33 
     34 #include "RenderRubyText.h"
     35 
     36 using namespace std;
     37 
     38 namespace WebCore {
     39 
     40 RenderRubyText::RenderRubyText(Node* node)
     41     : RenderBlock(node)
     42 {
     43 }
     44 
     45 RenderRubyText::~RenderRubyText()
     46 {
     47 }
     48 
     49 bool RenderRubyText::isChildAllowed(RenderObject* child, RenderStyle*) const
     50 {
     51     return child->isInline();
     52 }
     53 
     54 ETextAlign RenderRubyText::textAlignmentForLine(bool endsWithSoftBreak) const
     55 {
     56     ETextAlign textAlign = style()->textAlign();
     57     if (textAlign != TAAUTO)
     58         return RenderBlock::textAlignmentForLine(endsWithSoftBreak);
     59 
     60     // The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
     61     return JUSTIFY;
     62 }
     63 
     64 void RenderRubyText::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
     65 {
     66     ETextAlign textAlign = style()->textAlign();
     67     if (textAlign != TAAUTO)
     68         return RenderBlock::adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, logicalWidth);
     69 
     70     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
     71     if (maxPreferredLogicalWidth >= logicalWidth)
     72         return;
     73 
     74     // Inset the ruby text by half the inter-ideograph expansion amount, but no more than a full-width
     75     // ruby character on each side.
     76     float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
     77     if (expansionOpportunityCount)
     78         inset = min<float>(2 * style()->fontSize(), inset);
     79 
     80     logicalLeft += inset / 2;
     81     logicalWidth -= inset;
     82 }
     83 
     84 } // namespace WebCore
     85