1/*
2 * Copyright (C) 2007, 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2007 Staikos Computing Services Inc. <info@staikos.net>
4 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "config.h"
29#include "ScrollbarThemeQStyle.h"
30
31#include "GraphicsContext.h"
32#include "PlatformMouseEvent.h"
33#include "RenderThemeQStyle.h"
34#include "ScrollView.h"
35#include "Scrollbar.h"
36
37namespace WebCore {
38
39ScrollbarThemeQStyle::ScrollbarThemeQStyle()
40{
41    m_qStyle = adoptPtr(RenderThemeQStyle::styleFactory()(/*page*/ 0));
42}
43
44ScrollbarThemeQStyle::~ScrollbarThemeQStyle()
45{
46}
47
48static QStyleFacade::SubControl scPart(const ScrollbarPart& part)
49{
50    switch (part) {
51    case NoPart:
52        return QStyleFacade::SC_None;
53    case BackButtonStartPart:
54    case BackButtonEndPart:
55        return QStyleFacade::SC_ScrollBarSubLine;
56    case BackTrackPart:
57        return QStyleFacade::SC_ScrollBarSubPage;
58    case ThumbPart:
59        return QStyleFacade::SC_ScrollBarSlider;
60    case ForwardTrackPart:
61        return QStyleFacade::SC_ScrollBarAddPage;
62    case ForwardButtonStartPart:
63    case ForwardButtonEndPart:
64        return QStyleFacade::SC_ScrollBarAddLine;
65    }
66
67    return QStyleFacade::SC_None;
68}
69
70static ScrollbarPart scrollbarPart(const QStyleFacade::SubControl& sc)
71{
72    switch (sc) {
73    case QStyleFacade::SC_None:
74        return NoPart;
75    case QStyleFacade::SC_ScrollBarSubLine:
76        return BackButtonStartPart;
77    case QStyleFacade::SC_ScrollBarSubPage:
78        return BackTrackPart;
79    case QStyleFacade::SC_ScrollBarSlider:
80        return ThumbPart;
81    case QStyleFacade::SC_ScrollBarAddPage:
82        return ForwardTrackPart;
83    case QStyleFacade::SC_ScrollBarAddLine:
84        return ForwardButtonStartPart;
85    }
86    return NoPart;
87}
88
89static QStyleFacadeOption initSliderStyleOption(ScrollbarThemeClient* scrollbar, QObject* widget = 0)
90{
91    QStyleFacadeOption opt;
92    if (widget) {
93        opt.palette = widget->property("palette").value<QPalette>();
94        opt.rect = widget->property("rect").value<QRect>();
95        opt.direction = static_cast<Qt::LayoutDirection>(widget->property("layoutDirection").toInt());
96    } else
97        opt.state |= QStyleFacade::State_Active;
98
99    opt.state &= ~QStyleFacade::State_HasFocus;
100
101    opt.rect = scrollbar->frameRect();
102    if (scrollbar->enabled())
103        opt.state |= QStyleFacade::State_Enabled;
104    if (scrollbar->controlSize() != RegularScrollbar)
105        opt.state |= QStyleFacade::State_Mini;
106    opt.slider.orientation = (scrollbar->orientation() == VerticalScrollbar) ? Qt::Vertical : Qt::Horizontal;
107
108    if (scrollbar->orientation() == HorizontalScrollbar)
109        opt.state |= QStyleFacade::State_Horizontal;
110    else
111        opt.state &= ~QStyleFacade::State_Horizontal;
112
113    opt.slider.value = scrollbar->value();
114    opt.slider.position = opt.slider.value;
115    opt.slider.pageStep = scrollbar->pageStep();
116    opt.slider.singleStep = scrollbar->lineStep();
117    opt.slider.minimum = 0;
118    opt.slider.maximum = qMax(0, scrollbar->maximum());
119    ScrollbarPart pressedPart = scrollbar->pressedPart();
120    ScrollbarPart hoveredPart = scrollbar->hoveredPart();
121    if (pressedPart != NoPart) {
122        opt.slider.activeSubControls = scPart(scrollbar->pressedPart());
123        if (pressedPart == BackButtonStartPart || pressedPart == ForwardButtonStartPart
124            || pressedPart == BackButtonEndPart || pressedPart == ForwardButtonEndPart
125            || pressedPart == ThumbPart)
126            opt.state |= QStyleFacade::State_Sunken;
127    } else
128        opt.slider.activeSubControls = scPart(hoveredPart);
129    if (hoveredPart != NoPart)
130        opt.state |= QStyleFacade::State_MouseOver;
131    return opt;
132}
133
134bool ScrollbarThemeQStyle::paint(ScrollbarThemeClient* scrollbar, GraphicsContext* graphicsContext, const IntRect& dirtyRect)
135{
136    if (graphicsContext->updatingControlTints()) {
137        scrollbar->invalidateRect(dirtyRect);
138        return false;
139    }
140
141    StylePainterQStyle p(this, graphicsContext);
142    if (!p.isValid())
143        return true;
144
145    p.painter->save();
146    p.styleOption = initSliderStyleOption(scrollbar, m_qStyle->widgetForPainter(p.painter));
147
148    p.painter->setClipRect(p.styleOption.rect.intersected(dirtyRect), Qt::IntersectClip);
149    p.paintScrollBar();
150    p.painter->restore();
151    return true;
152}
153
154ScrollbarPart ScrollbarThemeQStyle::hitTest(ScrollbarThemeClient* scrollbar, const IntPoint& position)
155{
156    QStyleFacadeOption opt = initSliderStyleOption(scrollbar);
157    const QPoint pos = scrollbar->convertFromContainingWindow(position);
158    opt.rect.moveTo(QPoint(0, 0));
159    QStyleFacade::SubControl sc = m_qStyle->hitTestScrollBar(opt, pos);
160    return scrollbarPart(sc);
161}
162
163bool ScrollbarThemeQStyle::shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent& evt)
164{
165    // Middle click centers slider thumb (if supported).
166    return m_qStyle->scrollBarMiddleClickAbsolutePositionStyleHint() && evt.button() == MiddleButton;
167}
168
169void ScrollbarThemeQStyle::invalidatePart(ScrollbarThemeClient* scrollbar, ScrollbarPart)
170{
171    // FIXME: Do more precise invalidation.
172    scrollbar->invalidate();
173}
174
175int ScrollbarThemeQStyle::scrollbarThickness(ScrollbarControlSize controlSize)
176{
177    const bool mini = controlSize != RegularScrollbar;
178    return m_qStyle->scrollBarExtent(mini);
179}
180
181int ScrollbarThemeQStyle::thumbPosition(ScrollbarThemeClient* scrollbar)
182{
183    if (scrollbar->enabled()) {
184        float pos = (float)scrollbar->currentPos() * (trackLength(scrollbar) - thumbLength(scrollbar)) / scrollbar->maximum();
185        return (pos < 1 && pos > 0) ? 1 : pos;
186    }
187    return 0;
188}
189
190int ScrollbarThemeQStyle::thumbLength(ScrollbarThemeClient* scrollbar)
191{
192    QStyleFacadeOption opt = initSliderStyleOption(scrollbar);
193    QRect thumb = m_qStyle->scrollBarSubControlRect(opt, QStyleFacade::SC_ScrollBarSlider);
194    return scrollbar->orientation() == HorizontalScrollbar ? thumb.width() : thumb.height();
195}
196
197int ScrollbarThemeQStyle::trackPosition(ScrollbarThemeClient* scrollbar)
198{
199    QStyleFacadeOption opt = initSliderStyleOption(scrollbar);
200    QRect track = m_qStyle->scrollBarSubControlRect(opt, QStyleFacade::SC_ScrollBarGroove);
201    return scrollbar->orientation() == HorizontalScrollbar ? track.x() - scrollbar->x() : track.y() - scrollbar->y();
202}
203
204int ScrollbarThemeQStyle::trackLength(ScrollbarThemeClient* scrollbar)
205{
206    QStyleFacadeOption opt = initSliderStyleOption(scrollbar);
207    QRect track = m_qStyle->scrollBarSubControlRect(opt, QStyleFacade::SC_ScrollBarGroove);
208    return scrollbar->orientation() == HorizontalScrollbar ? track.width() : track.height();
209}
210
211void ScrollbarThemeQStyle::paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& rect)
212{
213    StylePainterQStyle p(this, context);
214    if (!p.isValid())
215        return;
216
217    p.paintScrollCorner(rect);
218}
219
220}
221
222