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// Copyright 2014 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.
#ifndef UI_BASE_IME_IME_BRIDGE_H_
#define UI_BASE_IME_IME_BRIDGE_H_
#include "base/macros.h"
#include "build/build_config.h"
#include "ui/base/ime/ime_engine_handler_interface.h"
#include "ui/base/ime/ime_input_context_handler_interface.h"
#include "ui/base/ime/ui_base_ime_export.h"
#if defined(OS_CHROMEOS)
#include "ui/base/ime/chromeos/ime_candidate_window_handler_interface.h"
namespace chromeos {
class IMECandidateWindowHandlerInterface;
}
#endif
namespace ui {
// IMEBridge provides access of each IME related handler. This class
// is used for IME implementation.
class UI_BASE_IME_EXPORT IMEBridge {
public:
virtual ~IMEBridge();
// Allocates the global instance. Must be called before any calls to Get().
static void Initialize();
// Releases the global instance.
static void Shutdown();
// Returns IMEBridge global instance. Initialize() must be called first.
static IMEBridge* Get();
// Returns current InputContextHandler. This function returns NULL if input
// context is not ready to use.
virtual IMEInputContextHandlerInterface* GetInputContextHandler() const = 0;
// Updates current InputContextHandler. If there is no active input context,
// pass NULL for |handler|. Caller must release |handler|.
virtual void SetInputContextHandler(
IMEInputContextHandlerInterface* handler) = 0;
// Updates current EngineHandler. If there is no active engine service, pass
// NULL for |handler|. Caller must release |handler|.
virtual void SetCurrentEngineHandler(IMEEngineHandlerInterface* handler) = 0;
// Returns current EngineHandler. This function returns NULL if current engine
// is not ready to use.
virtual IMEEngineHandlerInterface* GetCurrentEngineHandler() const = 0;
// Updates the current input context.
// This is called from InputMethodChromeOS.
virtual void SetCurrentInputContext(
const IMEEngineHandlerInterface::InputContext& input_context) = 0;
// Returns the current input context.
// This is called from InputMethodEngine.
virtual const IMEEngineHandlerInterface::InputContext&
GetCurrentInputContext() const = 0;
#if defined(OS_CHROMEOS)
// Returns current CandidateWindowHandler. This function returns NULL if
// current candidate window is not ready to use.
virtual chromeos::IMECandidateWindowHandlerInterface*
GetCandidateWindowHandler() const = 0;
// Updates current CandidatWindowHandler. If there is no active candidate
// window service, pass NULL for |handler|. Caller must release |handler|.
virtual void SetCandidateWindowHandler(
chromeos::IMECandidateWindowHandlerInterface* handler) = 0;
#endif
protected:
IMEBridge();
private:
DISALLOW_COPY_AND_ASSIGN(IMEBridge);
};
} // namespace ui
#endif // UI_BASE_IME_IME_BRIDGE_H_
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