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1 // Copyright (c) 2011 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 #ifndef VIEWS_PAINTER_H_ | |
6 #define VIEWS_PAINTER_H_ | |
7 #pragma once | |
8 | |
9 #include "base/basictypes.h" | |
10 #include "base/compiler_specific.h" | |
11 #include "third_party/skia/include/core/SkColor.h" | |
12 #include "views/views_export.h" | |
13 | |
14 namespace gfx { | |
15 class Canvas; | |
16 class Insets; | |
17 } | |
18 class SkBitmap; | |
19 | |
20 namespace views { | |
21 | |
22 // Painter, as the name implies, is responsible for painting in a particular | |
23 // region. Think of Painter as a Border or Background that can be painted | |
24 // in any region of a View. | |
25 class VIEWS_EXPORT Painter { | |
26 public: | |
27 // A convenience method for painting a Painter in a particular region. | |
28 // This translates the canvas to x/y and paints the painter. | |
29 static void PaintPainterAt(int x, int y, int w, int h, | |
30 gfx::Canvas* canvas, Painter* painter); | |
31 | |
32 // Creates a painter that draws a gradient between the two colors. | |
33 static Painter* CreateHorizontalGradient(SkColor c1, SkColor c2); | |
34 static Painter* CreateVerticalGradient(SkColor c1, SkColor c2); | |
35 | |
36 // Creates a painter that divides |image| into nine regions. The four corners | |
37 // are rendered at the size specified in insets (for example, the upper | |
38 // left corners is rendered at 0x0 with a size of | |
39 // insets.left()xinsets.right()). The four edges are stretched to fill the | |
40 // destination size. | |
41 // Ownership is passed to the caller. | |
42 static Painter* CreateImagePainter(const SkBitmap& image, | |
43 const gfx::Insets& insets, | |
44 bool paint_center); | |
45 | |
46 virtual ~Painter() {} | |
47 | |
48 // Paints the painter in the specified region. | |
49 virtual void Paint(int w, int h, gfx::Canvas* canvas) = 0; | |
50 }; | |
51 | |
52 // HorizontalPainter paints 3 images into a box: left, center and right. The | |
53 // left and right images are drawn to size at the left/right edges of the | |
54 // region. The center is tiled in the remaining space. All images must have the | |
55 // same height. | |
56 class VIEWS_EXPORT HorizontalPainter : public Painter { | |
57 public: | |
58 // Constructs a new HorizontalPainter loading the specified image names. | |
59 // The images must be in the order left, right and center. | |
60 explicit HorizontalPainter(const int image_resource_names[]); | |
61 | |
62 virtual ~HorizontalPainter() {} | |
63 | |
64 // Paints the images. | |
65 virtual void Paint(int w, int h, gfx::Canvas* canvas) OVERRIDE; | |
66 | |
67 // Height of the images. | |
68 int height() const { return height_; } | |
69 | |
70 private: | |
71 // The image chunks. | |
72 enum BorderElements { | |
73 LEFT, | |
74 CENTER, | |
75 RIGHT | |
76 }; | |
77 | |
78 // The height. | |
79 int height_; | |
80 // NOTE: the images are owned by ResourceBundle. Don't free them. | |
81 SkBitmap* images_[3]; | |
82 | |
83 DISALLOW_COPY_AND_ASSIGN(HorizontalPainter); | |
84 }; | |
85 | |
86 } // namespace views | |
87 | |
88 #endif // VIEWS_PAINTER_H_ | |
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