AncestorNotifier.java 文件源码

public void propertyChange(PropertyChangeEvent evt) {
    String s = evt.getPropertyName();

    if (s!=null && (s.equals("parent") || s.equals("ancestor"))) {
        JComponent component = (JComponent)evt.getSource();

        if (evt.getNewValue() != null) {
            if (component == firstInvisibleAncestor) {
                addListeners(component, false);
                if (firstInvisibleAncestor == null) {
                    fireAncestorAdded(root, AncestorEvent.ANCESTOR_ADDED,
                                      component, component.getParent());
                }
            }
        } else {
            boolean needsNotify = firstInvisibleAncestor == null;
            Container oldParent = (Container)evt.getOldValue();

            removeListeners(oldParent);
            firstInvisibleAncestor = component;
            if (needsNotify) {
                fireAncestorRemoved(root, AncestorEvent.ANCESTOR_REMOVED,
                                    component, oldParent);
            }
        }
    }
}