SwingSet3.java 文件源码

public void hierarchyChanged(HierarchyEvent event) {
    if ((event.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) > 0) {
        JComponent component = (JComponent)event.getComponent();
        final Demo demo = (Demo)component.getClientProperty("swingset3.demo");
        if (!component.isShowing()) {
            demo.stop();
        } else {
            demoContainer.revalidate();
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    demo.start();
                }
            });
        }
    }            
}