chrome/browser/extensions/extension_uninstall_dialog.h

   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_UNINSTALL_DIALOG_H_
   6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_UNINSTALL_DIALOG_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "content/public/browser/notification_observer.h"
  13 #include "content/public/browser/notification_registrar.h"
  14 #include "ui/gfx/image/image_skia.h"
  15
  16 class Browser;
  17 class Profile;
  18
  19 namespace base {
  20 class MessageLoop;
  21 }
  22
  23 namespace extensions {
  24 class Extension;
  25 }
  26
  27 namespace gfx {
  28 class Image;
  29 }
  30
  31 class ExtensionUninstallDialog
  32     : public content::NotificationObserver,
  33       public base::SupportsWeakPtr<ExtensionUninstallDialog> {
  34  public:
  35   class Delegate {
  36    public:
  37     // We call this method to signal that the uninstallation should continue.
  38     virtual void ExtensionUninstallAccepted() = 0;
  39
  40     // We call this method to signal that the uninstallation should stop.
  41     virtual void ExtensionUninstallCanceled() = 0;
  42
  43    protected:
  44     virtual ~Delegate() {}
  45   };
  46
  47   // Creates a platform specific implementation of ExtensionUninstallDialog.
  48   // |profile| and |delegate| can never be NULL.
  49   // |browser| can be NULL only for Ash when this is used with the applist
  50   // window.
  51   static ExtensionUninstallDialog* Create(Profile* profile,
  52                                           Browser* browser,
  53                                           Delegate* delegate);
  54
  55   virtual ~ExtensionUninstallDialog();
  56
  57   // This is called to verify whether the uninstallation should proceed.
  58   // Starts the process of showing a confirmation UI, which is split into two.
  59   // 1) Set off a 'load icon' task.
  60   // 2) Handle the load icon response and show the UI (OnImageLoaded).
  61   void ConfirmUninstall(const extensions::Extension* extension);
  62
  63  protected:
  64   // Constructor used by the derived classes.
  65   ExtensionUninstallDialog(Profile* profile,
  66                            Browser* browser,
  67                            Delegate* delegate);
  68
  69   Profile* const profile_;
  70
  71   Browser* browser_;
  72
  73   // The delegate we will call Accepted/Canceled on after confirmation dialog.
  74   Delegate* delegate_;
  75
  76   // The extension we are showing the dialog for.
  77   const extensions::Extension* extension_;
  78
  79   // The extensions icon.
  80   gfx::ImageSkia icon_;
  81
  82  private:
  83   // Sets the icon that will be used in the dialog. If |icon| contains an empty
  84   // image, then we use a default icon instead.
  85   void SetIcon(const gfx::Image& image);
  86
  87   void OnImageLoaded(const gfx::Image& image);
  88
  89   // content::NotificationObserver implementation.
  90   virtual void Observe(int type,
  91                        const content::NotificationSource& source,
  92                        const content::NotificationDetails& details) OVERRIDE;
  93
  94   // Displays the prompt. This should only be called after loading the icon.
  95   // The implementations of this method are platform-specific.
  96   virtual void Show() = 0;
  97
  98   // Keeps track of whether we're still waiting for an image to load before
  99   // we show the dialog.
 100   enum State {
 101     kImageIsLoading,  // Image is loading asynchronously.
 102     kDialogIsShowing, // Dialog is shown after image is loaded.
 103     kBrowserIsClosing // Browser is closed while image is still loading.
 104   };
 105   State state_;
 106
 107   base::MessageLoop* ui_loop_;
 108
 109   content::NotificationRegistrar registrar_;
 110
 111   DISALLOW_COPY_AND_ASSIGN(ExtensionUninstallDialog);
 112 };
 113
 114 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_UNINSTALL_DIALOG_H_