1/*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "RenderScrollbarTheme.h"
28#include "RenderScrollbar.h"
29#include <wtf/StdLibExtras.h>
30
31namespace WebCore {
32
33RenderScrollbarTheme* RenderScrollbarTheme::renderScrollbarTheme()
34{
35    DEFINE_STATIC_LOCAL(RenderScrollbarTheme, theme, ());
36    return &theme;
37}
38
39void RenderScrollbarTheme::buttonSizesAlongTrackAxis(Scrollbar* scrollbar, int& beforeSize, int& afterSize)
40{
41    IntRect firstButton = backButtonRect(scrollbar, BackButtonStartPart);
42    IntRect secondButton = forwardButtonRect(scrollbar, ForwardButtonStartPart);
43    IntRect thirdButton = backButtonRect(scrollbar, BackButtonEndPart);
44    IntRect fourthButton = forwardButtonRect(scrollbar, ForwardButtonEndPart);
45    if (scrollbar->orientation() == HorizontalScrollbar) {
46        beforeSize = firstButton.width() + secondButton.width();
47        afterSize = thirdButton.width() + fourthButton.width();
48    } else {
49        beforeSize = firstButton.height() + secondButton.height();
50        afterSize = thirdButton.height() + fourthButton.height();
51    }
52}
53
54bool RenderScrollbarTheme::hasButtons(Scrollbar* scrollbar)
55{
56    int startSize;
57    int endSize;
58    buttonSizesAlongTrackAxis(scrollbar, startSize, endSize);
59    return (startSize + endSize) <= (scrollbar->orientation() == HorizontalScrollbar ? scrollbar->width() : scrollbar->height());
60}
61
62bool RenderScrollbarTheme::hasThumb(Scrollbar* scrollbar)
63{
64    return trackLength(scrollbar) - thumbLength(scrollbar) >= 0;
65}
66
67int RenderScrollbarTheme::minimumThumbLength(Scrollbar* scrollbar)
68{
69    return toRenderScrollbar(scrollbar)->minimumThumbLength();
70}
71
72IntRect RenderScrollbarTheme::backButtonRect(Scrollbar* scrollbar, ScrollbarPart partType, bool)
73{
74    return toRenderScrollbar(scrollbar)->buttonRect(partType);
75}
76
77IntRect RenderScrollbarTheme::forwardButtonRect(Scrollbar* scrollbar, ScrollbarPart partType, bool)
78{
79    return toRenderScrollbar(scrollbar)->buttonRect(partType);
80}
81
82IntRect RenderScrollbarTheme::trackRect(Scrollbar* scrollbar, bool)
83{
84    if (!hasButtons(scrollbar))
85        return scrollbar->frameRect();
86
87    int startLength;
88    int endLength;
89    buttonSizesAlongTrackAxis(scrollbar, startLength, endLength);
90
91    return toRenderScrollbar(scrollbar)->trackRect(startLength, endLength);
92}
93
94IntRect RenderScrollbarTheme::constrainTrackRectToTrackPieces(Scrollbar* scrollbar, const IntRect& rect)
95{
96    IntRect backRect = toRenderScrollbar(scrollbar)->trackPieceRectWithMargins(BackTrackPart, rect);
97    IntRect forwardRect = toRenderScrollbar(scrollbar)->trackPieceRectWithMargins(ForwardTrackPart, rect);
98    IntRect result = rect;
99    if (scrollbar->orientation() == HorizontalScrollbar) {
100        result.setX(backRect.x());
101        result.setWidth(forwardRect.maxX() - backRect.x());
102    } else {
103        result.setY(backRect.y());
104        result.setHeight(forwardRect.maxY() - backRect.y());
105    }
106    return result;
107}
108
109void RenderScrollbarTheme::paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect)
110{
111    // FIXME: Implement.
112    context->fillRect(cornerRect, Color::white, ColorSpaceDeviceRGB);
113}
114
115void RenderScrollbarTheme::paintScrollbarBackground(GraphicsContext* context, Scrollbar* scrollbar)
116{
117    toRenderScrollbar(scrollbar)->paintPart(context, ScrollbarBGPart, scrollbar->frameRect());
118}
119
120void RenderScrollbarTheme::paintTrackBackground(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
121{
122    toRenderScrollbar(scrollbar)->paintPart(context, TrackBGPart, rect);
123}
124
125void RenderScrollbarTheme::paintTrackPiece(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
126{
127    toRenderScrollbar(scrollbar)->paintPart(context, part, rect);
128}
129
130void RenderScrollbarTheme::paintButton(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
131{
132    toRenderScrollbar(scrollbar)->paintPart(context, part, rect);
133}
134
135void RenderScrollbarTheme::paintThumb(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
136{
137    toRenderScrollbar(scrollbar)->paintPart(context, ThumbPart, rect);
138}
139
140}
141