Conflict detection for Extension Keybinding.

chrome/browser/extensions/extension_command_service.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_COMMAND_SERVICE_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_COMMAND_SERVICE_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_source.h"
+
+class PrefService;
+class Profile;
+
+namespace ui {
+  class Accelerator;
+}
+
+// This service keeps track of preferences related to extension commands
+// (assigning initial keybindings on install and removing them on deletion
+// and answers questions related to which commands are active.
+class ExtensionCommandService : public ProfileKeyedService,
+                                public content::NotificationObserver {
+ public:
+  // Register prefs for keybinding.
+  static void RegisterUserPrefs(PrefService* user_prefs);
+
+  // Constructs an ExtensionCommandService object for the given profile.
+  explicit ExtensionCommandService(Profile* profile);
+  virtual ~ExtensionCommandService();
+
+  // Gets the active keybinding (if any) for the browser action of an extension
+  // given its |extension_id|. The function consults the master list to see if
+  // the keybinding is active. Returns NULL if the extension has no browser
+  // action or no active keybinding for it.
+  const Extension::ExtensionKeybinding* GetActiveBrowserActionCommand(
+      const std::string& extension_id);
+
+  // Gets the active keybinding (if any) for the page action of an extension
+  // given its |extension_id|. The function consults the master list to see if
+  // the keybinding is active. Returns NULL if the extension has no page action
+  // or no active keybinding for it.
+  const Extension::ExtensionKeybinding* GetActivePageActionCommand(
+      const std::string& extension_id);
+
+  // Gets the active keybinding (if any) for the named commands of an extension
+  // given its |extension_id|. The function consults the master list to see if
+  // the keybinding is active. Returns an empty map if the extension has no
+  // named commands or no active keybinding for the commands.
+  Extension::CommandMap GetActiveNamedCommands(const std::string& extension_id);
+
+  // Checks to see if a keybinding |accelerator| for a given |command_name| in
+  // an extension with id |extension_id| is registered as active (by consulting
+  // the master list in |user_prefs|).
+  bool IsKeybindingActive(const ui::Accelerator& accelerator,
+                          std::string extension_id,
+                          std::string command_name);
+
+  // Records a keybinding |accelerator| as active for an extension with id
+  // |extension_id| and command with the name |command_name|. If
+  // |allow_overrides| is false, the keybinding must be free for the change to
+  // be recorded (as determined by the master list in |user_prefs|). If
+  // |allow_overwrites| is true, any previously recorded keybinding for this
+  // |accelerator| will be overwritten. Returns true if the change was
+  // successfully recorded.
+  bool AddKeybindingPref(const ui::Accelerator& accelerator,
+                         std::string extension_id,
+                         std::string command_name,
+                         bool allow_overrides);
+
+  // Overridden from content::NotificationObserver.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  // Assigns initial keybinding for a given |extension|'s page action, browser
+  // action and named commands. In each case, if the suggested keybinding is
+  // free, it will be taken by this extension. If not, that keybinding request
+  // is ignored. |user_pref| is the PrefService used to record the new
+  // keybinding assignment.
+  void AssignInitialKeybindings(const Extension* extension);
+
+  // Removes all keybindings for a given extension by its |extension_id|.
+  void RemoveKeybindingPrefs(std::string extension_id);
+
+  // The content notification registrar for listening to extension events.
+  content::NotificationRegistrar registrar_;
+
+  // A weak pointer to the profile we are associated with. Not owned by us.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionCommandService);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_COMMAND_SERVICE_H_