MyGUI_TextChangeHistory.h

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#ifndef MYGUI_TEXT_CHANGE_HISTORY_H_
#define MYGUI_TEXT_CHANGE_HISTORY_H_
 
#include "MyGUI_Prerequest.h"
#include "MyGUI_Macros.h"
#include "MyGUI_UString.h"
#include <deque>
 
namespace MyGUI
{
 
    // information about single text change operation
    struct TextCommandInfo
    {
        enum CommandType
        {
            COMMAND_POSITION,
            COMMAND_INSERT,
            COMMAND_ERASE
        };
 
        // for COMMAND_INSERT and COMMAND_ERASE
        TextCommandInfo(const UString::utf32string& _text, size_t _start, CommandType _type) :
            text(_text),
            type(_type),
            start(_start),
            undo(ITEM_NONE),
            redo(ITEM_NONE),
            length(ITEM_NONE)
        {
        }
 
        // for COMMAND_POSITION
        TextCommandInfo(size_t _undo, size_t _redo, size_t _length) :
            type(COMMAND_POSITION),
            start(ITEM_NONE),
            undo(_undo),
            redo(_redo),
            length(_length)
        {
        }
 
        // inserted/erased string
        UString::utf32string text;
        CommandType type;
        // text start position
        size_t start;
        // pseudo position
        size_t undo, redo, length;
    };
 
    using VectorChangeInfo = std::vector<TextCommandInfo>;
    using DequeUndoRedoInfo = std::deque<VectorChangeInfo>;
 
} // namespace MyGUI
 
#endif // MYGUI_TEXT_CHANGE_HISTORY_H_