UndoManager.java 文件源码

/**
 * Listener that is being attached to registered lists.
 *
 * @param change
 *            the change that occurred on the list
 */
@SuppressWarnings("unchecked")
private <T> void listChangeListener(Change<? extends T> change) {
    if (!this.isPerformingAction && !this.sleeping) {
        this.addUndoAction(new ListUndoAction<>((Change<T>) change));
    }
}