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