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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 #include "ui/app_list/views/cached_label.h" | |
6 | |
7 #include "base/strings/utf_string_conversions.h" | |
8 #include "build/build_config.h" | |
9 #include "ui/base/layout.h" | |
10 #include "ui/gfx/canvas.h" | |
11 #include "ui/views/widget/widget.h" | |
12 | |
13 namespace app_list { | |
14 | |
15 CachedLabel::CachedLabel() | |
16 : needs_repaint_(true) { | |
17 } | |
18 | |
19 void CachedLabel::PaintToBackingImage() { | |
20 if (image_.size() == size() && !needs_repaint_) | |
21 return; | |
22 | |
23 bool is_opaque = SkColorGetA(background_color()) == 0xFF; | |
24 float scale_factor = | |
25 ui::GetScaleFactorForNativeView(GetWidget()->GetNativeView()); | |
26 gfx::Canvas canvas(size(), scale_factor, is_opaque); | |
27 // If a background is provided, it will initialize the canvas in | |
28 // View::OnPaintBackground(). Otherwise, the background must be set here. | |
29 if (!background()) { | |
30 canvas.FillRect( | |
31 GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode); | |
32 } | |
33 | |
34 Label::OnPaint(&canvas); | |
35 | |
36 image_ = gfx::ImageSkia(canvas.ExtractImageRep()); | |
37 needs_repaint_ = false; | |
38 } | |
39 | |
40 #if defined(OS_WIN) | |
41 void CachedLabel::OnPaint(gfx::Canvas* canvas) { | |
42 PaintToBackingImage(); | |
43 canvas->DrawImageInt(image_, 0, 0); | |
44 } | |
45 #endif | |
46 | |
47 void CachedLabel::OnDeviceScaleFactorChanged( | |
48 float device_scale_factor) { | |
49 Invalidate(); | |
50 Label::OnDeviceScaleFactorChanged(device_scale_factor); | |
51 } | |
52 | |
53 } // namespace app_list | |
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