chrome/browser/extensions/extension_toolbar_model.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_TOOLBAR_MODEL_H_
   6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/observer_list.h"
  10 #include "base/prefs/pref_change_registrar.h"
  11 #include "base/scoped_observer.h"
  12 #include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
  13 #include "chrome/browser/extensions/extension_action.h"
  14 #include "components/keyed_service/core/keyed_service.h"
  15 #include "content/public/browser/notification_observer.h"
  16 #include "content/public/browser/notification_registrar.h"
  17 #include "extensions/browser/extension_prefs.h"
  18 #include "extensions/browser/extension_registry_observer.h"
  19 #include "extensions/common/extension.h"
  20
  21 class Browser;
  22 class PrefService;
  23 class Profile;
  24
  25 namespace extensions {
  26 class ExtensionRegistry;
  27 class ExtensionSet;
  28
  29 // Model for the browser actions toolbar.
  30 class ExtensionToolbarModel : public content::NotificationObserver,
  31                               public ExtensionActionAPI::Observer,
  32                               public ExtensionRegistryObserver,
  33                               public KeyedService {
  34  public:
  35   ExtensionToolbarModel(Profile* profile, ExtensionPrefs* extension_prefs);
  36   virtual ~ExtensionToolbarModel();
  37
  38   // A class which is informed of changes to the model; represents the view of
  39   // MVC. Also used for signaling view changes such as showing extension popups.
  40   // TODO(devlin): Should this really be an observer? It acts more like a
  41   // delegate.
  42   class Observer {
  43    public:
  44     // An extension has been added to the toolbar and should go at |index|.
  45     virtual void ToolbarExtensionAdded(const Extension* extension,
  46                                        int index) = 0;
  47
  48     // The given |extension| should be removed from the toolbar.
  49     virtual void ToolbarExtensionRemoved(const Extension* extension) = 0;
  50
  51     // The given |extension| has been moved to |index|. |index| is the desired
  52     // *final* index of the extension (that is, in the adjusted order, extension
  53     // should be at |index|).
  54     virtual void ToolbarExtensionMoved(const Extension* extension,
  55                                        int index) = 0;
  56
  57     // Signals that the browser action for the given |extension| has been
  58     // updated.
  59     virtual void ToolbarExtensionUpdated(const Extension* extension) = 0;
  60
  61     // Signal the |extension| to show the popup now in the active window.
  62     // If |grant_active_tab| is true, then active tab permissions should be
  63     // given to the extension (only do this if this is through a user action).
  64     // Returns true if a popup was slated to be shown.
  65     virtual bool ShowExtensionActionPopup(const Extension* extension,
  66                                           bool grant_active_tab) = 0;
  67
  68     // Signal when the container needs to be redrawn because of a size change,
  69     // and when the model has finished loading.
  70     virtual void ToolbarVisibleCountChanged() = 0;
  71
  72     // Signal that the model has entered or exited highlighting mode, or that
  73     // the extensions being highlighted have (probably*) changed. Highlighting
  74     // mode indicates that only a subset of the extensions are actively
  75     // displayed, and those extensions should be highlighted for extra emphasis.
  76     // * probably, because if we are in highlight mode and receive a call to
  77     //   highlight a new set of extensions, we do not compare the current set
  78     //   with the new set (and just assume the new set is different).
  79     virtual void ToolbarHighlightModeChanged(bool is_highlighting) = 0;
  80
  81     // Returns the browser associated with the Observer.
  82     virtual Browser* GetBrowser() = 0;
  83
  84    protected:
  85     virtual ~Observer() {}
  86   };
  87
  88   // Convenience function to get the ExtensionToolbarModel for a Profile.
  89   static ExtensionToolbarModel* Get(Profile* profile);
  90
  91   // Add or remove an observer.
  92   void AddObserver(Observer* observer);
  93   void RemoveObserver(Observer* observer);
  94
  95   // Moves the given |extension|'s icon to the given |index|.
  96   void MoveExtensionIcon(const Extension* extension, size_t index);
  97
  98   // Sets the number of extension icons that should be visible.
  99   // If count == size(), this will set the visible icon count to -1, meaning
 100   // "show all actions".
 101   void SetVisibleIconCount(int count);
 102
 103   // As above, a return value of -1 represents "show all actions".
 104   int GetVisibleIconCount() const { return visible_icon_count_; }
 105
 106   bool extensions_initialized() const { return extensions_initialized_; }
 107
 108   const ExtensionList& toolbar_items() const {
 109     return is_highlighting_ ? highlighted_items_ : toolbar_items_;
 110   }
 111
 112   bool is_highlighting() const { return is_highlighting_; }
 113
 114   void OnExtensionToolbarPrefChange();
 115
 116   // Finds the Observer associated with |browser| and tells it to display a
 117   // popup for the given |extension|. If |grant_active_tab| is true, this
 118   // grants active tab permissions to the |extension|; only do this because of
 119   // a direct user action.
 120   bool ShowExtensionActionPopup(const Extension* extension,
 121                                 Browser* browser,
 122                                 bool grant_active_tab);
 123
 124   // Ensures that the extensions in the |extension_ids| list are visible on the
 125   // toolbar. This might mean they need to be moved to the front (if they are in
 126   // the overflow bucket).
 127   void EnsureVisibility(const ExtensionIdList& extension_ids);
 128
 129   // Highlight the extensions specified by |extension_ids|. This will cause
 130   // the ToolbarModel to only display those extensions.
 131   // Highlighting mode is only entered if there is at least one extension to
 132   // be shown.
 133   // Returns true if highlighting mode is entered, false otherwise.
 134   bool HighlightExtensions(const ExtensionIdList& extension_ids);
 135
 136   // Stop highlighting extensions. All extensions can be shown again, and the
 137   // number of visible icons will be reset to what it was before highlighting.
 138   void StopHighlighting();
 139
 140  private:
 141   // content::NotificationObserver:
 142   virtual void Observe(int type,
 143                        const content::NotificationSource& source,
 144                        const content::NotificationDetails& details) override;
 145
 146   // Callback when extensions are ready.
 147   void OnReady();
 148
 149   // ExtensionRegistryObserver:
 150   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
 151                                  const Extension* extension) override;
 152   virtual void OnExtensionUnloaded(
 153       content::BrowserContext* browser_context,
 154       const Extension* extension,
 155       UnloadedExtensionInfo::Reason reason) override;
 156   virtual void OnExtensionUninstalled(
 157       content::BrowserContext* browser_context,
 158       const Extension* extension,
 159       extensions::UninstallReason reason) override;
 160
 161   // ExtensionActionAPI::Observer:
 162   virtual void OnExtensionActionUpdated(
 163       ExtensionAction* extension_action,
 164       content::WebContents* web_contents,
 165       content::BrowserContext* browser_context) override;
 166
 167   // To be called after the extension service is ready; gets loaded extensions
 168   // from the ExtensionRegistry and their saved order from the pref service
 169   // and constructs |toolbar_items_| from these data. IncognitoPopulate()
 170   // takes the shortcut - looking at the regular model's content and modifying
 171   // it.
 172   void InitializeExtensionList();
 173   void Populate(const ExtensionIdList& positions);
 174   void IncognitoPopulate();
 175
 176   // Save the model to prefs.
 177   void UpdatePrefs();
 178
 179   // Updates |extension|'s browser action visibility pref if the browser action
 180   // is in the overflow menu and should be considered hidden.
 181   void MaybeUpdateVisibilityPref(const Extension* extension, int index);
 182
 183   // Calls MaybeUpdateVisibilityPref() for each extension in |toolbar_items|.
 184   void MaybeUpdateVisibilityPrefs();
 185
 186   // Finds the last known visible position of the icon for an |extension|. The
 187   // value returned is a zero-based index into the vector of visible items.
 188   size_t FindNewPositionFromLastKnownGood(const Extension* extension);
 189
 190   // Returns true if the given |extension| should be added to the toolbar.
 191   bool ShouldAddExtension(const Extension* extension);
 192
 193   // Adds or removes the given |extension| from the toolbar model.
 194   void AddExtension(const Extension* extension);
 195   void RemoveExtension(const Extension* extension);
 196
 197   // Removes all current items (because we're going to [re]Populate()).
 198   void ClearItems();
 199
 200   // Our observers.
 201   ObserverList<Observer> observers_;
 202
 203   // The Profile this toolbar model is for.
 204   Profile* profile_;
 205
 206   ExtensionPrefs* extension_prefs_;
 207   PrefService* prefs_;
 208
 209   // True if we've handled the initial EXTENSIONS_READY notification.
 210   bool extensions_initialized_;
 211
 212   // If true, we include all extensions in the toolbar model. If false, we only
 213   // include browser actions.
 214   bool include_all_extensions_;
 215
 216   // Ordered list of browser action buttons.
 217   ExtensionList toolbar_items_;
 218
 219   // List of browser action buttons which should be highlighted.
 220   ExtensionList highlighted_items_;
 221
 222   // Indication whether or not we are currently in highlight mode; typically,
 223   // this is equivalent to !highlighted_items_.empty(), but can be different
 224   // if we are exiting highlight mode due to no longer having highlighted items.
 225   bool is_highlighting_;
 226
 227   // The number of icons which were visible before highlighting a subset, in
 228   // order to restore the count when finished.
 229   int old_visible_icon_count_;
 230
 231   ExtensionIdList last_known_positions_;
 232
 233   // The number of icons visible (the rest should be hidden in the overflow
 234   // chevron).
 235   int visible_icon_count_;
 236
 237   content::NotificationRegistrar registrar_;
 238
 239   ScopedObserver<ExtensionActionAPI, ExtensionActionAPI::Observer>
 240       extension_action_observer_;
 241
 242   // Listen to extension load, unloaded notifications.
 243   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
 244       extension_registry_observer_;
 245
 246   // For observing change of toolbar order preference by external entity (sync).
 247   PrefChangeRegistrar pref_change_registrar_;
 248   base::Closure pref_change_callback_;
 249
 250   base::WeakPtrFactory<ExtensionToolbarModel> weak_ptr_factory_;
 251
 252   DISALLOW_COPY_AND_ASSIGN(ExtensionToolbarModel);
 253 };
 254
 255 }  // namespace extensions
 256
 257 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_