1/*
2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
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 "RenderSlider.h"
23
24#include "CSSPropertyNames.h"
25#include "Document.h"
26#include "Event.h"
27#include "EventHandler.h"
28#include "EventNames.h"
29#include "Frame.h"
30#include "HTMLInputElement.h"
31#include "HTMLNames.h"
32#include "HTMLParserIdioms.h"
33#include "MediaControlElements.h"
34#include "MouseEvent.h"
35#include "Node.h"
36#include "RenderLayer.h"
37#include "RenderTheme.h"
38#include "RenderView.h"
39#include "ShadowRoot.h"
40#include "SliderThumbElement.h"
41#include "StepRange.h"
42#include "StyleResolver.h"
43#include <wtf/MathExtras.h>
44#include <wtf/StackStats.h>
45
46namespace WebCore {
47
48const int RenderSlider::defaultTrackLength = 129;
49
50RenderSlider::RenderSlider(HTMLInputElement& element, PassRef<RenderStyle> style)
51    : RenderFlexibleBox(element, WTF::move(style))
52{
53    // We assume RenderSlider works only with <input type=range>.
54    ASSERT(element.isRangeControl());
55}
56
57RenderSlider::~RenderSlider()
58{
59}
60
61HTMLInputElement& RenderSlider::element() const
62{
63    return toHTMLInputElement(nodeForNonAnonymous());
64}
65
66int RenderSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode) const
67{
68    // FIXME: Patch this function for writing-mode.
69    return height() + marginTop();
70}
71
72void RenderSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
73{
74    maxLogicalWidth = defaultTrackLength * style().effectiveZoom();
75    if (!style().width().isPercent())
76        minLogicalWidth = maxLogicalWidth;
77}
78
79void RenderSlider::computePreferredLogicalWidths()
80{
81    m_minPreferredLogicalWidth = 0;
82    m_maxPreferredLogicalWidth = 0;
83
84    if (style().width().isFixed() && style().width().value() > 0)
85        m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(style().width().value());
86    else
87        computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
88
89    if (style().minWidth().isFixed() && style().minWidth().value() > 0) {
90        m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style().minWidth().value()));
91        m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style().minWidth().value()));
92    }
93
94    if (style().maxWidth().isFixed()) {
95        m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style().maxWidth().value()));
96        m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style().maxWidth().value()));
97    }
98
99    LayoutUnit toAdd = horizontalBorderAndPaddingExtent();
100    m_minPreferredLogicalWidth += toAdd;
101    m_maxPreferredLogicalWidth += toAdd;
102
103    setPreferredLogicalWidthsDirty(false);
104}
105
106void RenderSlider::layout()
107{
108    StackStats::LayoutCheckPoint layoutCheckPoint;
109
110    // FIXME: Find a way to cascade appearance. http://webkit.org/b/62535
111    RenderBox* thumbBox = element().sliderThumbElement()->renderBox();
112    if (thumbBox && thumbBox->isSliderThumb())
113        static_cast<RenderSliderThumb*>(thumbBox)->updateAppearance(&style());
114
115    RenderFlexibleBox::layout();
116}
117
118bool RenderSlider::inDragMode() const
119{
120    return element().sliderThumbElement()->active();
121}
122
123} // namespace WebCore
124