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
RenderRubyText(Node * node)40 RenderRubyText::RenderRubyText(Node* node)
41 : RenderBlock(node)
42 {
43 }
44
~RenderRubyText()45 RenderRubyText::~RenderRubyText()
46 {
47 }
48
isChildAllowed(RenderObject * child,RenderStyle *) const49 bool RenderRubyText::isChildAllowed(RenderObject* child, RenderStyle*) const
50 {
51 return child->isInline();
52 }
53
textAlignmentForLine(bool endsWithSoftBreak) const54 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
adjustInlineDirectionLineBounds(int expansionOpportunityCount,float & logicalLeft,float & logicalWidth) const64 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