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 "core/rendering/RenderRubyText.h"
35
36namespace blink {
37
38RenderRubyText::RenderRubyText(Element* element)
39    : RenderBlockFlow(element)
40{
41}
42
43RenderRubyText::~RenderRubyText()
44{
45}
46
47bool RenderRubyText::isChildAllowed(RenderObject* child, RenderStyle*) const
48{
49    return child->isInline();
50}
51
52ETextAlign RenderRubyText::textAlignmentForLine(bool endsWithSoftBreak) const
53{
54    ETextAlign textAlign = style()->textAlign();
55    // FIXME: This check is bogus since user can set the initial value.
56    if (textAlign != RenderStyle::initialTextAlign())
57        return RenderBlockFlow::textAlignmentForLine(endsWithSoftBreak);
58
59    // The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
60    return JUSTIFY;
61}
62
63void RenderRubyText::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
64{
65    ETextAlign textAlign = style()->textAlign();
66    // FIXME: This check is bogus since user can set the initial value.
67    if (textAlign != RenderStyle::initialTextAlign())
68        return RenderBlockFlow::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 = std::min<float>(2 * style()->fontSize(), inset);
79
80    logicalLeft += inset / 2;
81    logicalWidth -= inset;
82}
83
84bool RenderRubyText::avoidsFloats() const
85{
86    return true;
87}
88
89} // namespace blink
90