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 "ChromiumBridge.h"
31 #include "PlatformMouseEvent.h"
32 #include "Scrollbar.h"
33 #include "ScrollbarClient.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
paintTrackBackground(GraphicsContext * context,Scrollbar * scrollbar,const IntRect & rect)78 void ScrollbarThemeChromium::paintTrackBackground(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
79 {
80 // Just assume a forward track part. We only paint the track as a single piece when there is no thumb.
81 if (!hasThumb(scrollbar))
82 paintTrackPiece(context, scrollbar, rect, ForwardTrackPart);
83 }
84
paintTickmarks(GraphicsContext * context,Scrollbar * scrollbar,const IntRect & rect)85 void ScrollbarThemeChromium::paintTickmarks(GraphicsContext* context, Scrollbar* scrollbar, const IntRect& rect)
86 {
87 if (scrollbar->orientation() != VerticalScrollbar)
88 return;
89
90 if (rect.height() <= 0 || rect.width() <= 0)
91 return; // nothing to draw on.
92
93 // Get the tickmarks for the frameview.
94 Vector<IntRect> tickmarks;
95 scrollbar->client()->getTickmarks(tickmarks);
96 if (!tickmarks.size())
97 return;
98
99 // Get the image for the tickmarks.
100 static RefPtr<Image> dash = Image::loadPlatformResource("tickmarkDash");
101 if (dash->isNull()) {
102 ASSERT_NOT_REACHED();
103 return;
104 }
105
106 context->save();
107
108 for (Vector<IntRect>::const_iterator i = tickmarks.begin(); i != tickmarks.end(); ++i) {
109 // Calculate how far down (in %) the tick-mark should appear.
110 const float percent = static_cast<float>(i->y()) / scrollbar->totalSize();
111
112 // Calculate how far down (in pixels) the tick-mark should appear.
113 const int yPos = rect.topLeft().y() + (rect.height() * percent);
114
115 IntPoint tick(scrollbar->x(), yPos);
116 context->drawImage(dash.get(), DeviceColorSpace, tick);
117 }
118
119 context->restore();
120 }
121
paintScrollCorner(ScrollView * view,GraphicsContext * context,const IntRect & cornerRect)122 void ScrollbarThemeChromium::paintScrollCorner(ScrollView* view, GraphicsContext* context, const IntRect& cornerRect)
123 {
124 // ScrollbarThemeComposite::paintScrollCorner incorrectly assumes that the
125 // ScrollView is a FrameView (see FramelessScrollView), so we cannot let
126 // that code run. For FrameView's this is correct since we don't do custom
127 // scrollbar corner rendering, which ScrollbarThemeComposite supports.
128 ScrollbarTheme::paintScrollCorner(view, context, cornerRect);
129 }
130
131 } // namespace WebCore
132