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/***************************************************************************
editablestreamhistory.h - description
-------------------
begin : Sun Jul 9 2000
copyright : (C) 2000 by Artur Rataj
email : art@zeus.polsl.gliwice.pl
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef EDITABLESTREAMHISTORY_H
#define EDITABLESTREAMHISTORY_H
/** A template class adding undo/redo history for EDITABLE_STREAM paste and cut
* methods
* @author Artur Rataj
*/
template <class EDITABLE_STREAM> class EditableStreamHistory {
public:
/** Constructs the class with stream as an EDITABLE_STREAM and
* a given number of undo levels
*/
EditableStreamHistory(EDITABLE_STREAM* stream, const int undoLevels);
~EditableStreamHistory();
/** Cuts a stream at index, of length length.
* Uses undo/redo history.
* @return A stream that has been cut out
*/
EDITABLE_STREAM cut(const int index, const int length);
/** Pastes a stream at index. Uses undo/redo history */
void paste(const int index, EDITABLE_STREAM& pasteStream);
/** Replaces a stream at index. Uses undo/redo history */
void replace(const int index, EDITABLE_STREAM& replaceStream);
/** @return Whether undo possible */
bool undoPossible();
/** @return Whether redo possible */
bool redoPossible();
/** Undoes if possible */
void undo();
/** Redoes if possible */
void redo();
/** @return A pointer to editableStream */
EDITABLE_STREAM* editableStream();
protected:
/** An editable stream */
EDITABLE_STREAM* m_editableStream;
/** A number of undo levels */
int m_undoLevels;
};
template <class EDITABLE_STREAM> EditableStreamHistory<EDITABLE_STREAM>::
EditableStreamHistory(EDITABLE_STREAM* stream, const int undoLevels) {
m_editableStream = stream;
m_undoLevels = undoLevels;
}
template <class EDITABLE_STREAM> EditableStreamHistory<EDITABLE_STREAM>::~EditableStreamHistory() {
}
template <class EDITABLE_STREAM> EDITABLE_STREAM
EditableStreamHistory<EDITABLE_STREAM>::cut(const int index, const int length) {
EDITABLE_STREAM cut_stream = m_editableStream->cut(index, length);
return cut_stream;
}
template <class EDITABLE_STREAM> void
EditableStreamHistory<EDITABLE_STREAM>::paste(const int index, EDITABLE_STREAM& pasteStream) {
m_editableStream->paste(index, pasteStream);
}
template <class EDITABLE_STREAM> void
EditableStreamHistory<EDITABLE_STREAM>::replace(const int index, EDITABLE_STREAM& replaceStream) {
m_editableStream->cut(index, replaceStream.length());
m_editableStream->paste(index, replaceStream);
}
template <class EDITABLE_STREAM> bool
EditableStreamHistory<EDITABLE_STREAM>::undoPossible() {
return false;
}
template <class EDITABLE_STREAM> bool
EditableStreamHistory<EDITABLE_STREAM>::redoPossible() {
return false;
}
template <class EDITABLE_STREAM> void
EditableStreamHistory<EDITABLE_STREAM>::undo() {
}
template <class EDITABLE_STREAM> void
EditableStreamHistory<EDITABLE_STREAM>::redo() {
}
template <class EDITABLE_STREAM> EDITABLE_STREAM*
EditableStreamHistory<EDITABLE_STREAM>::editableStream() {
return m_editableStream;
}
#endif
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