1 /**
2 * Copyright (C) 2005 Apple Computer, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20
21 #include "config.h"
22 #include "core/rendering/RenderButton.h"
23
24 namespace blink {
25
26 using namespace HTMLNames;
27
RenderButton(Element * element)28 RenderButton::RenderButton(Element* element)
29 : RenderFlexibleBox(element)
30 , m_inner(0)
31 {
32 }
33
~RenderButton()34 RenderButton::~RenderButton()
35 {
36 }
37
addChild(RenderObject * newChild,RenderObject * beforeChild)38 void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild)
39 {
40 if (!m_inner) {
41 // Create an anonymous block.
42 ASSERT(!firstChild());
43 m_inner = createAnonymousBlock(style()->display());
44 RenderFlexibleBox::addChild(m_inner);
45 }
46
47 m_inner->addChild(newChild, beforeChild);
48 }
49
removeChild(RenderObject * oldChild)50 void RenderButton::removeChild(RenderObject* oldChild)
51 {
52 // m_inner should be the only child, but checking for direct children who
53 // are not m_inner prevents security problems when that assumption is
54 // violated.
55 if (oldChild == m_inner || !m_inner || oldChild->parent() == this) {
56 ASSERT(oldChild == m_inner || !m_inner);
57 RenderFlexibleBox::removeChild(oldChild);
58 m_inner = 0;
59 } else
60 m_inner->removeChild(oldChild);
61 }
62
updateAnonymousChildStyle(const RenderObject * child,RenderStyle * childStyle) const63 void RenderButton::updateAnonymousChildStyle(const RenderObject* child, RenderStyle* childStyle) const
64 {
65 ASSERT(!m_inner || child == m_inner);
66
67 childStyle->setFlexGrow(1.0f);
68 // Use margin:auto instead of align-items:center to get safe centering, i.e.
69 // when the content overflows, treat it the same as align-items: flex-start.
70 childStyle->setMarginTop(Length());
71 childStyle->setMarginBottom(Length());
72 childStyle->setFlexDirection(style()->flexDirection());
73 childStyle->setJustifyContent(style()->justifyContent());
74 childStyle->setFlexWrap(style()->flexWrap());
75 childStyle->setAlignItems(style()->alignItems());
76 childStyle->setAlignContent(style()->alignContent());
77 }
78
canHaveGeneratedChildren() const79 bool RenderButton::canHaveGeneratedChildren() const
80 {
81 // Input elements can't have generated children, but button elements can. We'll
82 // write the code assuming any other button types that might emerge in the future
83 // can also have children.
84 return !isHTMLInputElement(*node());
85 }
86
controlClipRect(const LayoutPoint & additionalOffset) const87 LayoutRect RenderButton::controlClipRect(const LayoutPoint& additionalOffset) const
88 {
89 // Clip to the padding box to at least give content the extra padding space.
90 return LayoutRect(additionalOffset.x() + borderLeft(), additionalOffset.y() + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom());
91 }
92
baselinePosition(FontBaseline baseline,bool firstLine,LineDirectionMode direction,LinePositionMode linePositionMode) const93 int RenderButton::baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
94 {
95 ASSERT(linePositionMode == PositionOnContainingLine);
96 // We want to call the RenderBlock version of firstLineBoxBaseline to
97 // avoid RenderFlexibleBox synthesizing a baseline that we don't want.
98 // We use this check as a proxy for "are there any line boxes in this button"
99 if (!hasLineIfEmpty() && RenderBlock::firstLineBoxBaseline() == -1) {
100 // To ensure that we have a consistent baseline when we have no children,
101 // even when we have the anonymous RenderBlock child, we calculate the
102 // baseline for the empty case manually here.
103 if (direction == HorizontalLine)
104 return marginTop() + borderTop() + paddingTop() + contentHeight();
105
106 return marginRight() + borderRight() + paddingRight() + contentWidth();
107 }
108 return RenderFlexibleBox::baselinePosition(baseline, firstLine, direction, linePositionMode);
109 }
110
111 } // namespace blink
112