BasicInternalFrameTitlePane.java 文件源码

protected void installListeners() {
    if (propertyChangeListener == null) {
        propertyChangeListener = createPropertyChangeListener();
    }
    frame.addPropertyChangeListener(propertyChangeListener);

    // propertyChangeListener will be uninstalled
    // when title pane is removed from internal frame
    addHierarchyListener(new HierarchyListener() {
        public void hierarchyChanged(final HierarchyEvent e) {
            if (e.getChanged() == BasicInternalFrameTitlePane.this
                    && (e.getChangeFlags() & HierarchyEvent.PARENT_CHANGED) != 0
                    && !frame.isAncestorOf(BasicInternalFrameTitlePane.this)) {
                uninstallListeners();
            }
        }
    });
}