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 class IBusController; 16 17 // CandidateWindowController is used for controlling the input method 18 // candidate window. Once the initialization is done, the controller 19 // starts monitoring signals sent from the the background input method 20 // daemon, and shows and hides the candidate window as neeeded. Upon 21 // deletion of the object, monitoring stops and the view used for 22 // rendering the candidate view is deleted. 23 class CandidateWindowController { 24 public: 25 class Observer { 26 public: 27 virtual ~Observer() {} 28 29 virtual void CandidateWindowOpened() = 0; 30 virtual void CandidateWindowClosed() = 0; 31 }; 32 33 virtual ~CandidateWindowController() {} 34 35 // Initializes the candidate window. Returns true on success. |controller| can 36 // be NULL. 37 // TODO(nona): Refine observer chain once IBusUiController is removed. 38 virtual bool Init() = 0; 39 40 // Shutdown the candidate window controller. |controller| can be NULL. 41 // TODO(nona): Refine observer chain once IBusUiController is removed. 42 virtual void Shutdown() = 0; 43 virtual void AddObserver(Observer* observer) = 0; 44 virtual void RemoveObserver(Observer* observer) = 0; 45 46 // Gets an instance of CandidateWindowController. Caller has to delete the 47 // returned object. 48 static CandidateWindowController* CreateCandidateWindowController(); 49 }; 50 51 } // namespace input_method 52 } // namespace chromeos 53 54 #endif // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_ 55
