void InitUndoMgr() {
final UndoManager undo = new UndoManager();
Document doc = txt_box.getDocument();
// Listen for undo and redo events
doc.addUndoableEditListener(
new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undo.addEdit(evt.getEdit());
}
});
// Create an undo action and add it to the text component
txt_box
.getActionMap()
.put(
"Undo",
new AbstractAction("Undo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canUndo()) {
undo.undo();
}
} catch (CannotUndoException e) {
}
}
});
// Bind the undo action to ctl-Z
txt_box.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
// Create a redo action and add it to the text component
txt_box
.getActionMap()
.put(
"Redo",
new AbstractAction("Redo") {
public void actionPerformed(ActionEvent evt) {
try {
if (undo.canRedo()) {
undo.redo();
}
} catch (CannotRedoException e) {
}
}
});
// Bind the redo action to ctl-Y
txt_box.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
}
