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// Copyright (c) 2011 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_CHARACTER_COMPOSER_H_
#define UI_BASE_IME_CHARACTER_COMPOSER_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/string_util.h"
#include "ui/base/ui_export.h"
namespace ui {
// A class to recognize compose and dead key sequence.
// Outputs composed character.
//
// TODO(hashimoto): support unicode character composition starting with
// Ctrl-Shift-U. http://crosbug.com/15925
class UI_EXPORT CharacterComposer {
public:
CharacterComposer();
~CharacterComposer();
void Reset();
// Filters keypress.
// Returns true if the keypress is recognized as a part of composition
// sequence.
bool FilterKeyPress(unsigned int keycode);
// Returns a string consisting of composed character.
// Empty string is returned when there is no composition result.
const string16& composed_character() const {
return composed_character_;
}
private:
// Remembers keypresses previously filtered.
std::vector<unsigned int> compose_buffer_;
// A string representing the composed character.
string16 composed_character_;
DISALLOW_COPY_AND_ASSIGN(CharacterComposer);
};
} // namespace ui
#endif // UI_BASE_IME_CHARACTER_COMPOSER_H_
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