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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_IME_WIN_TSF_BRIDGE_H_
#define UI_BASE_IME_WIN_TSF_BRIDGE_H_
#include <Windows.h>
#include <msctf.h>
#include "base/basictypes.h"
#include "base/win/scoped_comptr.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.
static void Shutdown();
// 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(const TextInputClient* client) = 0;
// Sends an event to TSF manager that the text layout should be updated.
virtual void OnTextLayoutChanged() = 0;
// Cancels the ongoing composition if exists.
// Returns true if there is no composition.
// Returns false if an edit session is on-going.
// Returns false if an error occures.
virtual bool CancelComposition() = 0;
// Confirms the ongoing composition if exists.
// Returns true if there is no composition.
// Returns false if an edit session is on-going.
// Returns false if an error occures.
virtual bool ConfirmComposition() = 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;
// Obtains current thread manager.
virtual base::win::ScopedComPtr<ITfThreadMgr> GetThreadManager() = 0;
// Returns the focused text input client.
virtual TextInputClient* GetFocusedTextInputClient() const = 0;
protected:
// Uses GetInstance() instead.
TSFBridge();
private:
// Releases TLS instance.
static void Finalize(void* data);
DISALLOW_COPY_AND_ASSIGN(TSFBridge);
};
} // namespace ui
#endif // UI_BASE_IME_WIN_TSF_BRIDGE_H_
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