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| 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 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_ | |
| 6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 #include <string> | |
| 10 | |
| 11 #include "base/basictypes.h" | |
| 12 #include "base/memory/weak_ptr.h" | |
| 13 #include "content/public/browser/notification_observer.h" | |
| 14 #include "content/public/browser/notification_registrar.h" | |
| 15 #include "extensions/common/extension_icon_set.h" | |
| 16 #include "ui/base/layout.h" | |
| 17 #include "ui/gfx/image/image_skia.h" | |
| 18 | |
| 19 namespace content { | |
| 20 class BrowserContext; | |
| 21 } | |
| 22 | |
| 23 namespace extensions { | |
| 24 class Extension; | |
| 25 } | |
| 26 | |
| 27 namespace gfx { | |
| 28 class Size; | |
| 29 class Image; | |
| 30 } | |
| 31 | |
| 32 namespace extensions { | |
| 33 | |
| 34 // A class that provides an ImageSkia for UI code to use. It handles extension | |
| 35 // icon resource loading, screen scale factor change etc. UI code that uses | |
| 36 // extension icon should host this class and be its observer. ExtensionIconImage | |
| 37 // should be outlived by the observer. In painting code, UI code paints with the | |
| 38 // ImageSkia provided by this class. If required extension icon resource is not | |
| 39 // already present, this class tries to load it and calls its observer interface | |
| 40 // when the image get updated. Until the resource is loaded, the UI code will be | |
| 41 // provided with blank, transparent image. | |
| 42 // If the requested resource doesn't exist or can't be loaded and a default | |
| 43 // icon was supplied in the constructor, icon image will be updated with the | |
| 44 // default icon's resource. | |
| 45 // The default icon doesn't need to be supplied, but in that case, icon image | |
| 46 // representation will be left blank if the resource loading fails. | |
| 47 // If default icon is supplied, it is assumed that it contains or can | |
| 48 // synchronously create (when |GetRepresentation| is called on it) | |
| 49 // representations for all the scale factors supported by the current platform. | |
| 50 // Note that |IconImage| is not thread safe. | |
| 51 class IconImage : public content::NotificationObserver { | |
| 52 public: | |
| 53 class Observer { | |
| 54 public: | |
| 55 // Invoked when a new image rep for an additional scale factor | |
| 56 // is loaded and added to |image|. | |
| 57 virtual void OnExtensionIconImageChanged(IconImage* image) = 0; | |
| 58 | |
| 59 protected: | |
| 60 virtual ~Observer() {} | |
| 61 }; | |
| 62 | |
| 63 // |context| is required by the underlying implementation to retrieve the | |
| 64 // |ImageLoader| instance associated with the given context. |ImageLoader| is | |
| 65 // used to perform the asynchronous image load work. | |
| 66 IconImage(content::BrowserContext* context, | |
| 67 const Extension* extension, | |
| 68 const ExtensionIconSet& icon_set, | |
| 69 int resource_size_in_dip, | |
| 70 const gfx::ImageSkia& default_icon, | |
| 71 Observer* observer); | |
| 72 virtual ~IconImage(); | |
| 73 | |
| 74 const gfx::ImageSkia& image_skia() const { return image_skia_; } | |
| 75 | |
| 76 private: | |
| 77 class Source; | |
| 78 | |
| 79 // Loads an image representation for the scale factor. | |
| 80 // If the representation gets loaded synchronously, it is returned by this | |
| 81 // method. | |
| 82 // If representation loading is asynchronous, an empty image | |
| 83 // representation is returned. When the representation gets loaded the | |
| 84 // observer's |OnExtensionIconImageLoaded| will be called. | |
| 85 gfx::ImageSkiaRep LoadImageForScaleFactor(ui::ScaleFactor scale_factor); | |
| 86 | |
| 87 void OnImageLoaded(float scale_factor, const gfx::Image& image); | |
| 88 | |
| 89 // content::NotificationObserver overrides: | |
| 90 virtual void Observe(int type, | |
| 91 const content::NotificationSource& source, | |
| 92 const content::NotificationDetails& details) OVERRIDE; | |
| 93 | |
| 94 content::BrowserContext* browser_context_; | |
| 95 const Extension* extension_; | |
| 96 const ExtensionIconSet& icon_set_; | |
| 97 const int resource_size_in_dip_; | |
| 98 | |
| 99 Observer* observer_; | |
| 100 | |
| 101 Source* source_; // Owned by ImageSkia storage. | |
| 102 gfx::ImageSkia image_skia_; | |
| 103 // The icon with whose representation |image_skia_| should be updated if | |
| 104 // its own representation load fails. | |
| 105 gfx::ImageSkia default_icon_; | |
| 106 | |
| 107 content::NotificationRegistrar registrar_; | |
| 108 | |
| 109 base::WeakPtrFactory<IconImage> weak_ptr_factory_; | |
| 110 | |
| 111 DISALLOW_COPY_AND_ASSIGN(IconImage); | |
| 112 }; | |
| 113 | |
| 114 } // namespace extensions | |
| 115 | |
| 116 #endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_H_ | |
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Chromium Code Reviews
Issue 334053003:
Moves extension_icon_image and image_loader to extensions/browser (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src