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| 1 // Copyright (c) 2013 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_GLOBAL_SHORTCUT_LISTENER_H_ |
| 6 #define CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_H_ |
| 7 |
| 8 #include <map> |
| 9 |
| 10 #include "base/observer_list.h" |
| 11 #include "ui/events/keycodes/keyboard_codes.h" |
| 12 #include "ui/gfx/native_widget_types.h" |
| 13 |
| 14 namespace ui { |
| 15 class Accelerator; |
| 16 } |
| 17 |
| 18 namespace extensions { |
| 19 |
| 20 // Platform-neutral implementation of a class that keeps track of observers and |
| 21 // monitors keystrokes. It relays messages to the appropriate observers when a |
| 22 // global shortcut has been struck by the user. |
| 23 class GlobalShortcutListener { |
| 24 public: |
| 25 class Observer { |
| 26 public: |
| 27 // Called when your global shortcut (|accelerator|) is struck. |
| 28 virtual void OnKeyPressed(const ui::Accelerator& accelerator) = 0; |
| 29 }; |
| 30 |
| 31 virtual ~GlobalShortcutListener(); |
| 32 |
| 33 static GlobalShortcutListener* GetInstance(); |
| 34 |
| 35 // Implemented by platform-specific implementations of this class. |
| 36 virtual void StartListening() = 0; |
| 37 virtual void StopListening() = 0; |
| 38 |
| 39 // Register an observer for when a certain |accelerator| is struck. |
| 40 virtual void RegisterAccelerator( |
| 41 const ui::Accelerator& accelerator, Observer* observer); |
| 42 // Stop listening for the given |accelerator|. |
| 43 virtual void UnregisterAccelerator( |
| 44 const ui::Accelerator& accelerator, Observer* observer); |
| 45 |
| 46 protected: |
| 47 GlobalShortcutListener(); |
| 48 |
| 49 // Called by platform specific implementations of this class whenever a key |
| 50 // is struck. Only called for keys that have observers registered. |
| 51 void NotifyKeyPressed(const ui::Accelerator& accelerator); |
| 52 |
| 53 // The map of accelerators that have been successfully registered as global |
| 54 // shortcuts and their observer lists. |
| 55 typedef ObserverList<Observer> Observers; |
| 56 typedef std::map< ui::Accelerator, Observers* > AcceleratorMap; |
| 57 AcceleratorMap accelerator_map_; |
| 58 |
| 59 private: |
| 60 DISALLOW_COPY_AND_ASSIGN(GlobalShortcutListener); |
| 61 }; |
| 62 |
| 63 } // namespace extensions |
| 64 |
| 65 #endif // CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_H_ |
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