chrome/browser/chromeos/input_method/candidate_window_controller.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 // This file implements the input method candidate window used on Chrome OS.
   6
   7 #ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_
   8 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_
   9
  10 #include "base/basictypes.h"
  11
  12 namespace chromeos {
  13 namespace input_method {
  14
  15 // CandidateWindowController is used for controlling the input method
  16 // candidate window. Once the initialization is done, the controller
  17 // starts monitoring signals sent from the the background input method
  18 // daemon, and shows and hides the candidate window as neeeded. Upon
  19 // deletion of the object, monitoring stops and the view used for
  20 // rendering the candidate view is deleted.
  21 class CandidateWindowController {
  22  public:
  23   class Observer {
  24    public:
  25     virtual ~Observer() {}
  26
  27     virtual void CandidateClicked(int index) = 0;
  28     virtual void CandidateWindowOpened() = 0;
  29     virtual void CandidateWindowClosed() = 0;
  30   };
  31
  32   virtual ~CandidateWindowController() {}
  33
  34   virtual void AddObserver(Observer* observer) = 0;
  35   virtual void RemoveObserver(Observer* observer) = 0;
  36   virtual void Hide() = 0;
  37
  38   // Gets an instance of CandidateWindowController. Caller has to delete the
  39   // returned object.
  40   static CandidateWindowController* CreateCandidateWindowController();
  41 };
  42
  43 }  // namespace input_method
  44 }  // namespace chromeos
  45
  46 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_