ash/accelerators/accelerator_dispatcher.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 ASH_ACCELERATORS_ACCELERATOR_DISPATCHER_H_
   6 #define ASH_ACCELERATORS_ACCELERATOR_DISPATCHER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/message_loop.h"
  10 #include "ui/aura/window.h"
  11 #include "ui/aura/window_observer.h"
  12
  13 namespace ash {
  14
  15 // Dispatcher for handling accelerators from menu.
  16 //
  17 // Wraps a nested dispatcher to which control is passed if no accelerator key
  18 // has been pressed.
  19 // TODO(pkotwicz): Port AcceleratorDispatcher to mac.
  20 // TODO(pkotwicz): Add support for a |nested_dispatcher| which sends
  21 //  events to a system IME.
  22 class ASH_EXPORT AcceleratorDispatcher : public base::MessageLoop::Dispatcher,
  23                                          public aura::WindowObserver {
  24  public:
  25   AcceleratorDispatcher(base::MessageLoop::Dispatcher* nested_dispatcher,
  26                         aura::Window* associated_window);
  27   virtual ~AcceleratorDispatcher();
  28
  29   // MessageLoop::Dispatcher overrides:
  30   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
  31
  32   // aura::WindowObserver overrides:
  33   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
  34
  35  private:
  36   base::MessageLoop::Dispatcher* nested_dispatcher_;
  37
  38   // Window associated with |nested_dispatcher_| which is used to determine
  39   // whether the |nested_dispatcher_| is allowed to receive events.
  40   aura::Window* associated_window_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(AcceleratorDispatcher);
  43 };
  44
  45 }  // namespace ash
  46
  47 #endif  // ASH_ACCELERATORS_ACCELERATOR_DISPATCHER_H_