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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file implements the input method candidate window used on Chrome OS.
#ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_
#define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_
#include "base/basictypes.h"
namespace chromeos {
namespace input_method {
class IBusController;
// CandidateWindowController is used for controlling the input method
// candidate window. Once the initialization is done, the controller
// starts monitoring signals sent from the the background input method
// daemon, and shows and hides the candidate window as neeeded. Upon
// deletion of the object, monitoring stops and the view used for
// rendering the candidate view is deleted.
class CandidateWindowController {
public:
class Observer {
public:
virtual ~Observer() {}
virtual void CandidateWindowOpened() = 0;
virtual void CandidateWindowClosed() = 0;
};
virtual ~CandidateWindowController() {}
// Initializes the candidate window. Returns true on success. |controller| can
// be NULL.
// TODO(nona): Refine observer chain once IBusUiController is removed.
virtual bool Init() = 0;
// Shutdown the candidate window controller. |controller| can be NULL.
// TODO(nona): Refine observer chain once IBusUiController is removed.
virtual void Shutdown() = 0;
virtual void AddObserver(Observer* observer) = 0;
virtual void RemoveObserver(Observer* observer) = 0;
// Gets an instance of CandidateWindowController. Caller has to delete the
// returned object.
static CandidateWindowController* CreateCandidateWindowController();
};
} // namespace input_method
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_CONTROLLER_H_
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