1 /*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2008, 2009 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "ScrollbarThemeChromium.h"
29
30 #include "PlatformBridge.h"
31 #include "PlatformMouseEvent.h"
32 #include "ScrollableArea.h"
33 #include "Scrollbar.h"
34 #include "ScrollbarThemeComposite.h"
35
36 // -----------------------------------------------------------------------------
37 // This file contains scrollbar theme code that is cross platform. Additional
38 // members of ScrollbarThemeChromium can be found in the platform specific files
39 // -----------------------------------------------------------------------------
40
41 namespace WebCore {
42
hasThumb(Scrollbar * scrollbar)43 bool ScrollbarThemeChromium::hasThumb(Scrollbar* scrollbar)
44 {
45 // This method is just called as a paint-time optimization to see if
46 // painting the thumb can be skipped. We don't have to be exact here.
47 return thumbLength(scrollbar) > 0;
48 }
49
backButtonRect(Scrollbar * scrollbar,ScrollbarPart part,bool)50 IntRect ScrollbarThemeChromium::backButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
51 {
52 // Windows and Linux just have single arrows.
53 if (part == BackButtonEndPart)
54 return IntRect();
55
56 IntSize size = buttonSize(scrollbar);
57 return IntRect(scrollbar->x(), scrollbar->y(), size.width(), size.height());
58 }
59
forwardButtonRect(Scrollbar * scrollbar,ScrollbarPart part,bool)60 IntRect ScrollbarThemeChromium::forwardButtonRect(Scrollbar* scrollbar, ScrollbarPart part, bool)
61 {
62 // Windows and Linux just have single arrows.
63 if (part == ForwardButtonStartPart)
64 return IntRect();
65
66 IntSize size = buttonSize(scrollbar);
67 int x, y;
68 if (scrollbar->orientation() == HorizontalScrollbar) {
69 x = scrollbar->x() + scrollbar->width() - size.width();
70 y = scrollbar->y();
71 } else {
72 x = scrollbar->x();
73 y = scrollbar->y() + scrollbar->height() - size.height();
74 }
75 return IntRect(x, y, size.width(), size.height());
76 }
77
trackRect(Scrollbar * scrollbar,bool)78 IntRect ScrollbarThemeChromium::trackRect(Scrollbar* scrollbar, bool)
79 {
80 IntSize bs = buttonSize(scrollbar);
81 // The buttons at the top and bottom of the scrollbar are square, so the
82 // thickness of the scrollbar is also their height.
83 int thickness = scrollbarThickness(scrollbar->controlSize());
84 if (scrollbar->orientation() == HorizontalScrollbar) {
85 // Once the scrollbar becomes smaller than the natural size of the
86 // two buttons, the track disappears.
87 if (scrollbar->width() < 2 * thickness)
88 return IntRect();
89 return IntRect(scrollbar->x() + bs.width(), scrollbar->y(), scrollbar->width() - 2 * bs.width(), thickness);
90 }
91 if (scrollbar->height() < 2 * thickness)
92 return IntRect();
93 return IntRect(scrollbar->x(), scrollbar->y() + bs.height(), thickness, scrollbar->height() - 2 * bs.height());
94 }
95
paintTrackBackground(GraphicsContext * context,Scrollbar * scrollbar,const IntRect & rect)96 void ScrollbarThemeChromium::paintTrackBackground(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
97 {
98 // Just assume a forward track part. We only paint the track as a single piece when there is no thumb.
99 if (!hasThumb(scrollbar))
100 paintTrackPiece(context, scrollbar, rect, ForwardTrackPart);
101 }
102
paintTickmarks(GraphicsContext * context,Scrollbar * scrollbar,const IntRect & rect)103 void ScrollbarThemeChromium::paintTickmarks(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
104 {
105 if (scrollbar->orientation() != VerticalScrollbar)
106 return;
107
108 if (rect.height() <= 0 || rect.width() <= 0)
109 return; // nothing to draw on.
110
111 // Get the tickmarks for the frameview.
112 Vector<IntRect> tickmarks;
113 scrollbar->scrollableArea()->getTickmarks(tickmarks);
114 if (!tickmarks.size())
115 return;
116
117 // Get the image for the tickmarks.
118 static RefPtr<Image> dash = Image::loadPlatformResource("tickmarkDash");
119 if (dash->isNull()) {
120 ASSERT_NOT_REACHED();
121 return;
122 }
123
124 context->save();
125
126 for (Vector<IntRect>::const_iterator i = tickmarks.begin(); i != tickmarks.end(); ++i) {
127 // Calculate how far down (in %) the tick-mark should appear.
128 const float percent = static_cast<float>(i->y()) / scrollbar->totalSize();
129
130 // Calculate how far down (in pixels) the tick-mark should appear.
131 const int yPos = rect.y() + (rect.height() * percent);
132
133 IntPoint tick(scrollbar->x(), yPos);
134 context->drawImage(dash.get(), ColorSpaceDeviceRGB, tick);
135 }
136
137 context->restore();
138 }
139
140 } // namespace WebCore
141