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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.
#ifndef UI_BASE_WIN_TSF_BRIDGE_H_
#define UI_BASE_WIN_TSF_BRIDGE_H_
#include <Windows.h>
#include "base/basictypes.h"
#include "ui/base/ui_export.h"
namespace ui {
class TextInputClient;
// TsfBridge provides high level IME related operations on top of Text Services
// Framework (TSF). TsfBridge is managed by TLS because TSF related stuff is
// associated with each thread and not allowed to access across thread boundary.
// To be consistent with IMM32 behavior, TsfBridge is shared in the same thread.
// TsfBridge is used by the web content text inputting field, for example
// DisableIME() should be called if a password field is focused.
//
// TsfBridge also manages connectivity between TsfTextStore which is the backend
// of text inputting and current focused TextInputClient.
//
// All methods in this class must be used in UI thread.
class UI_EXPORT TsfBridge {
public:
virtual ~TsfBridge();
// Returns the thread local TsfBridge instance. Initialize() must be called
// first. Do not cache this pointer and use it after TsfBridge Shutdown().
static TsfBridge* GetInstance();
// Sets the thread local instance. Must be called before any calls to
// GetInstance().
static bool Initialize();
// Injects an alternative TsfBridge such as MockTsfBridge for testing. The
// injected object should be released by the caller. This function returns
// previous TsfBridge pointer with ownership.
static TsfBridge* ReplaceForTesting(TsfBridge* bridge);
// Destroys the thread local instance.
virtual void Shutdown() = 0;
// Handles TextInputTypeChanged event. RWHVW is responsible for calling this
// handler whenever renderer's input text type is changed. Does nothing
// unless |client| is focused.
virtual void OnTextInputTypeChanged(TextInputClient* client) = 0;
// Cancels the ongoing composition if exists.
// Returns false if an error occures.
virtual bool CancelComposition() = 0;
// Sets currently focused TextInputClient.
// Caller must free |client|.
virtual void SetFocusedClient(HWND focused_window,
TextInputClient* client) = 0;
// Removes currently focused TextInputClient.
// Caller must free |client|.
virtual void RemoveFocusedClient(TextInputClient* client) = 0;
protected:
// Uses GetInstance() instead.
TsfBridge();
private:
DISALLOW_COPY_AND_ASSIGN(TsfBridge);
};
} // namespace ui
#endif // UI_BASE_WIN_TSF_BRIDGE_H_
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