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1 // Copyright 2013 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 UI_APP_LIST_VIEWS_CACHED_LABEL_H_ | |
6 #define UI_APP_LIST_VIEWS_CACHED_LABEL_H_ | |
7 | |
8 #include "build/build_config.h" | |
9 #include "ui/gfx/image/image_skia.h" | |
10 #include "ui/views/controls/label.h" | |
11 #include "ui/views/view.h" | |
12 | |
13 namespace gfx { | |
14 class Canvas; | |
15 } | |
16 | |
17 namespace app_list { | |
18 | |
19 // Subclass of views::Label that caches the rendered text in an ImageSkia. | |
20 class CachedLabel : public views::Label { | |
21 public: | |
22 CachedLabel(); | |
23 | |
24 // Have the next call to OnPaint() update the backing image. | |
25 void Invalidate() { needs_repaint_ = true; } | |
26 | |
27 // Calls the base label's OnPaint() to paint into a backing image. | |
28 void PaintToBackingImage(); | |
29 | |
30 #if defined(OS_WIN) | |
31 // Overridden from views::View: | |
32 void OnPaint(gfx::Canvas* canvas) override; | |
33 #endif | |
34 | |
35 // Overridden from ui::LayerDelegate: | |
36 void OnDeviceScaleFactorChanged(float device_scale_factor) override; | |
37 | |
38 private: | |
39 bool needs_repaint_; | |
40 gfx::ImageSkia image_; | |
41 }; | |
42 | |
43 } // namespace app_list | |
44 | |
45 #endif // UI_APP_LIST_VIEWS_CACHED_LABEL_H_ | |
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