Swing 常用方法收集

    // RootPaneContainer can get layeredPane, if you want get location, you can case class to cantainer.
    // May return null
    private static RootPaneContainer getTopContainer(Component comp) {
        Container parent = comp.getParent();
        while ((parent != null) && !(parent instanceof Frame || parent instanceof Dialog || parent instanceof Applet)) {
            parent = parent.getParent();
        }
        return (RootPaneContainer) parent;
    }

    // May return null
    private static Window getTopLevelWindow(Component comp) {
        Container parent = comp.getParent();
        while ((parent != null) && !(parent instanceof Frame || parent instanceof Dialog)) {
            parent = parent.getParent();
        }
        return (Window) parent;
    }