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
12namespace chromeos {
13namespace 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.
21class 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_
47