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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_ACTION_ICON_FACTORY_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_ICON_FACTORY_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "extensions/browser/extension_icon_image.h"
     10 
     11 class ExtensionAction;
     12 class ExtensionIconSet;
     13 class Profile;
     14 
     15 namespace extensions {
     16 class Extension;
     17 }
     18 
     19 // Used to get an icon to be used in the UI for an extension action.
     20 // If the extension action icon is the default icon defined in the extension's
     21 // manifest, it is loaded using extensions::IconImage. This icon can be loaded
     22 // asynchronously. The factory observes underlying IconImage and notifies its
     23 // own observer when the icon image changes.
     24 class ExtensionActionIconFactory : public extensions::IconImage::Observer {
     25  public:
     26   class Observer {
     27    public:
     28     virtual ~Observer() {}
     29     // Called when the underlying icon image changes.
     30     virtual void OnIconUpdated() = 0;
     31   };
     32 
     33   // Observer should outlive this.
     34   ExtensionActionIconFactory(Profile* profile,
     35                              const extensions::Extension* extension,
     36                              const ExtensionAction* action,
     37                              Observer* observer);
     38   virtual ~ExtensionActionIconFactory();
     39 
     40   // extensions::IconImage override.
     41   virtual void OnExtensionIconImageChanged(
     42       extensions::IconImage* image) OVERRIDE;
     43 
     44   // Gets the extension action icon for the tab.
     45   // If there is an icon set using |SetIcon|, that icon is returned.
     46   // Else, if there is a default icon set for the extension action, the icon is
     47   // created using IconImage. Observer is triggered wheniever the icon gets
     48   // updated.
     49   // Else, extension favicon is returned.
     50   // In all cases, action's attention and animation icon transformations are
     51   // applied on the icon.
     52   gfx::Image GetIcon(int tab_id);
     53 
     54  private:
     55   // Gets the icon that should be returned by |GetIcon| (without the attention
     56   // and animation transformations).
     57   gfx::ImageSkia GetBaseIconFromAction(int tab_id);
     58 
     59   const extensions::Extension* extension_;
     60   const ExtensionAction* action_;
     61   Observer* observer_;
     62   // Underlying icon image for the default icon.
     63   scoped_ptr<extensions::IconImage> default_icon_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(ExtensionActionIconFactory);
     66 };
     67 
     68 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_ICON_FACTORY_H_
     69