Implement first part of supporting global extension commands.

chrome/browser/extensions/extension_commands_global_registry.h

+// Copyright (c) 2013 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_COMMANDS_GLOBAL_REGISTRY_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_COMMANDS_GLOBAL_REGISTRY_H_
+
+#include <map>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
+#include "chrome/browser/extensions/extension_keybinding_registry.h"
+#include "chrome/browser/extensions/global_shortcut_listener.h"
+#include "ui/base/accelerators/accelerator.h"
+
+class Profile;
+
+namespace extensions {
+class Extension;
+}
+
+namespace extensions {
+
+// ExtensionCommandsGlobalRegistry is a class that handles the cross-platform
+// implementation of the global shortcut registration for the Extension Commands
+// API).
+// Note: It handles regular extension commands (not browserAction and pageAction
+// popups, which are not bindable to global shortcuts). This class registers the
+// accelerators on behalf of the extensions and routes the commands to them via
+// the BrowserEventRouter.
+class ExtensionCommandsGlobalRegistry
+    : public ProfileKeyedAPI,
+      public ExtensionKeybindingRegistry,
+      public GlobalShortcutListener::Observer {
+ public:
+  // ProfileKeyedAPI implementation.
+  static ProfileKeyedAPIFactory<
+      ExtensionCommandsGlobalRegistry>* GetFactoryInstance();
+
+  // Convenience method to get the ExtensionCommandsGlobalRegistry for a
+  // profile.
+  static ExtensionCommandsGlobalRegistry* Get(Profile* profile);
+
+  explicit ExtensionCommandsGlobalRegistry(Profile* profile);
+  virtual ~ExtensionCommandsGlobalRegistry();
+
+ private:
+  friend class ProfileKeyedAPIFactory<ExtensionCommandsGlobalRegistry>;
+
+  // ProfileKeyedAPI implementation.
+  static const char* service_name() {
+    return "ExtensionCommandsGlobalRegistry";
+  }
+
+  // Overridden from ExtensionKeybindingRegistry:
+  virtual void AddExtensionKeybinding(
+      const Extension* extension,
+      const std::string& command_name) OVERRIDE;
+  virtual void RemoveExtensionKeybinding(
+      const Extension* extension,
+      const std::string& command_name) OVERRIDE;
+
+  // Called by the GlobalShortcutListener object when a shortcut this class has
+  // registered for has been pressed.
+  virtual void OnKeyPressed(const ui::Accelerator& accelerator) OVERRIDE;
+
+  // Weak pointer to our profile. Not owned by us.
+  Profile* profile_;
+
+  // Maps an accelerator to a string pair (extension id, command name) for
+  // commands that have been registered.
+  typedef std::map< ui::Accelerator,
+                    std::pair<std::string, std::string> > EventTargets;

[Yoyo Zhou, 2013/10/03 22:08:50]

Why is this called EventTargets? I don't see either 'event' or 'target' in the
description.

[Finnur, 2013/10/04 17:57:02]

Moved to base class (and added a bit more comments to explain).

+  EventTargets event_targets_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionCommandsGlobalRegistry);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_COMMANDS_GLOBAL_REGISTRY_H_