public void setUndoItem() {
String itemName = undoMgr.getUndoPresentationName();
if (itemName != null && undoMgr.canUndo()) {
mainFrame.undoItem.setEnabled(true);
mainFrame.undoItem.setName(itemName);
} else {
mainFrame.undoItem.setEnabled(false);
mainFrame.undoItem.setName("Undo");
}
}
public void undoAction() {
try {
if (undoMgr.canUndo()) {
undoAction.actionPerformed(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "Undo"));
setUndoItem();
} else {
java.awt.Toolkit.getDefaultToolkit().beep();
}
} catch (CannotUndoException ex) {
ex.printStackTrace();
}
}
