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// Copyright 2013 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.
#include <Windows.h>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
namespace metro_viewer {
struct CharacterBounds;
namespace metro_driver {
class TextServiceDelegate;
// An interface to manage a virtual text store with which an IME communicates.
class TextService {
virtual ~TextService() {}
// Cancels on-going composition. Does nothing if there is no composition.
virtual void CancelComposition() = 0;
// Updates document type with |input_scopes| and caret/composition position
// with |character_bounds|. An empty |input_scopes| indicates that IMEs
// should be disabled until non-empty |input_scopes| is specified.
// Note: |input_scopes| is defined as std::vector<int32> here rather than
// std::vector<InputScope> because the wire format of IPC message
// MetroViewerHostMsg_ImeTextInputClientUpdated uses std::vector<int32> to
// avoid dependency on <InputScope.h> header.
virtual void OnDocumentChanged(
const std::vector<int32>& input_scopes,
const std::vector<metro_viewer::CharacterBounds>& character_bounds) = 0;
// Must be called whenever the attached window gains keyboard focus.
virtual void OnWindowActivated() = 0;
// Returns an instance of TextService that works together with
// |text_store_delegate| as if it was an text area owned by |window_handle|.
CreateTextService(TextServiceDelegate* delegate, HWND window_handle);
} // namespace metro_driver