1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/views/background.h"
6
7 #include "base/logging.h"
8 #include "skia/ext/skia_utils_win.h"
9 #include "third_party/skia/include/core/SkPaint.h"
10 #include "ui/gfx/canvas.h"
11 #include "ui/gfx/color_utils.h"
12 #include "ui/views/painter.h"
13 #include "ui/views/view.h"
14
15 namespace views {
16
17 // SolidBackground is a trivial Background implementation that fills the
18 // background in a solid color.
19 class SolidBackground : public Background {
20 public:
SolidBackground(SkColor color)21 explicit SolidBackground(SkColor color) {
22 SetNativeControlColor(color);
23 }
24
Paint(gfx::Canvas * canvas,View * view) const25 virtual void Paint(gfx::Canvas* canvas, View* view) const OVERRIDE {
26 // Fill the background. Note that we don't constrain to the bounds as
27 // canvas is already clipped for us.
28 canvas->DrawColor(get_color());
29 }
30
31 private:
32 DISALLOW_COPY_AND_ASSIGN(SolidBackground);
33 };
34
35 class BackgroundPainter : public Background {
36 public:
BackgroundPainter(bool owns_painter,Painter * painter)37 BackgroundPainter(bool owns_painter, Painter* painter)
38 : owns_painter_(owns_painter), painter_(painter) {
39 DCHECK(painter);
40 }
41
~BackgroundPainter()42 virtual ~BackgroundPainter() {
43 if (owns_painter_)
44 delete painter_;
45 }
46
47
Paint(gfx::Canvas * canvas,View * view) const48 virtual void Paint(gfx::Canvas* canvas, View* view) const OVERRIDE {
49 Painter::PaintPainterAt(canvas, painter_, view->GetLocalBounds());
50 }
51
52 private:
53 bool owns_painter_;
54 Painter* painter_;
55
56 DISALLOW_COPY_AND_ASSIGN(BackgroundPainter);
57 };
58
Background()59 Background::Background()
60 : color_(SK_ColorWHITE)
61 #if defined(OS_WIN)
62 , native_control_brush_(NULL)
63 #endif
64 {
65 }
66
~Background()67 Background::~Background() {
68 #if defined(OS_WIN)
69 DeleteObject(native_control_brush_);
70 #endif
71 }
72
SetNativeControlColor(SkColor color)73 void Background::SetNativeControlColor(SkColor color) {
74 color_ = color;
75 #if defined(OS_WIN)
76 DeleteObject(native_control_brush_);
77 native_control_brush_ = NULL;
78 #endif
79 }
80
81 #if defined(OS_WIN)
GetNativeControlBrush() const82 HBRUSH Background::GetNativeControlBrush() const {
83 if (!native_control_brush_)
84 native_control_brush_ = CreateSolidBrush(skia::SkColorToCOLORREF(color_));
85 return native_control_brush_;
86 }
87 #endif
88
89 //static
CreateSolidBackground(SkColor color)90 Background* Background::CreateSolidBackground(SkColor color) {
91 return new SolidBackground(color);
92 }
93
94 //static
CreateStandardPanelBackground()95 Background* Background::CreateStandardPanelBackground() {
96 // TODO(beng): Should be in NativeTheme.
97 return CreateSolidBackground(SK_ColorWHITE);
98 }
99
100 //static
CreateVerticalGradientBackground(SkColor color1,SkColor color2)101 Background* Background::CreateVerticalGradientBackground(SkColor color1,
102 SkColor color2) {
103 Background* background = CreateBackgroundPainter(
104 true, Painter::CreateVerticalGradient(color1, color2));
105 background->SetNativeControlColor(
106 color_utils::AlphaBlend(color1, color2, 128));
107
108 return background;
109 }
110
111 //static
CreateVerticalMultiColorGradientBackground(SkColor * colors,SkScalar * pos,size_t count)112 Background* Background::CreateVerticalMultiColorGradientBackground(
113 SkColor* colors,
114 SkScalar* pos,
115 size_t count) {
116 Background* background = CreateBackgroundPainter(
117 true, Painter::CreateVerticalMultiColorGradient(colors, pos, count));
118 background->SetNativeControlColor(
119 color_utils::AlphaBlend(colors[0], colors[count-1], 128));
120
121 return background;
122 }
123
124 //static
CreateBackgroundPainter(bool owns_painter,Painter * painter)125 Background* Background::CreateBackgroundPainter(bool owns_painter,
126 Painter* painter) {
127 return new BackgroundPainter(owns_painter, painter);
128 }
129
130 } // namespace views
131