/*
* (c) Copyright 2010-2011 AgileBirds
*
* This file is part of OpenFlexo.
*
* OpenFlexo 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 3 of the License, or
* (at your option) any later version.
*
* OpenFlexo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
*
*/
package org.openflexo.jedit;
import java.util.LinkedList;
public class TextEditionHistory {
public static int MAX_UNDO_LEVELS = 10;
private JEditTextArea _textArea;
private LinkedList<String> list;
private int maxUndoLevels;
private int index;
protected TextEditionHistory(JEditTextArea textArea) {
super();
_textArea = textArea;
list = new LinkedList<String>();
maxUndoLevels = MAX_UNDO_LEVELS;
index = -1;
}
public void retain() {
if (index > -1 && list.size() - 1 > index) {
while (index < list.size() - 1) {
list.removeLast();
}
}
while (list.size() >= maxUndoLevels) {
list.remove();
}
list.add(_textArea.getText());
index++;
}
public boolean isUndoable() {
return index > 0;
}
public void undo() {
if (isUndoable()) {
index--;
_textArea.setText(list.get(index));
}
}
public boolean isRedoable() {
return index < list.size() - 1;
}
public void redo() {
if (isRedoable()) {
index++;
_textArea.setText(list.get(index));
}
}
}