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
11class ExtensionAction;
12class ExtensionIconSet;
13class Profile;
14
15namespace extensions {
16class 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.
24class 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