Examples of java.awt.event.HierarchyListener

java.awt.event.HierarchyListener
The listener interface for receiving hierarchy changed events. The class that is interested in processing a hierarchy changed event should implement this interface. The listener object created from that class is then registered with a Component using the Component's addHierarchyListener method. When the hierarchy to which the Component belongs changes, the hierarchyChanged method in the listener object is invoked, and the HierarchyEvent is passed to it.
Hierarchy events are provided for notification purposes ONLY; The AWT will automatically handle changes to the hierarchy internally so that GUI layout, displayability, and visibility work properly regardless of whether a program registers a HierarchyListener or not. @author David Mendenhall @see HierarchyEvent @since 1.3

  protected void installListeners(final JRootPane root) {
    super.installListeners(root);


    // System.out.println("Listeners on root " + root.hashCode());


    this.substanceHierarchyListener = new HierarchyListener() {
      public void hierarchyChanged(HierarchyEvent e) {
        Component parent = root.getParent();
        if (parent == null) {
          // fix for defect 271 - check for null parent
          // as early as possible

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                {
                    initialFocusComponent = newComponent;
                    if ( initialFocusComponent instanceof JButton )
                    {
                        final JButton defaultB = ( JButton ) initialFocusComponent;
                        defaultB.addHierarchyListener ( new HierarchyListener ()
                        {
                            @Override
                            public void hierarchyChanged ( final HierarchyEvent e )
                            {
                                if ( ( e.getChangeFlags () & HierarchyEvent.PARENT_CHANGED ) != 0 )

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        }
        else {
            // Hierarchy events are fired in direct response to
            // displayability
            // changes
            w.addHierarchyListener(new HierarchyListener() {
                public void hierarchyChanged(HierarchyEvent e) {
                    if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0
                        && e.getComponent().isDisplayable()) {
                        e.getComponent().removeHierarchyListener(this);
                        action.run();

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        /*
         * Note: we listen for both resizing events (with HierarchyBoundsListener) 
         * and showing events (with HierarchyListener). Although showing
         * is often accompanied by resizing this is not reliable in Swing.
         */
        addHierarchyListener(new HierarchyListener() {
            @Override
            public void hierarchyChanged(HierarchyEvent he) {
                if ((he.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
                    if (isShowing()) {
                        onShownOrResized();

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        {   Main.error(e);
        Main.warn("FileDrop: Drop will not work due to previous error. Do you have another listener attached?" );
        }   // end catch


        // Listen for hierarchy changes and remove the drop target when the parent gets cleared out.
        c.addHierarchyListener( new HierarchyListener()
        {   @Override
            public void hierarchyChanged( HierarchyEvent evt )
        {   Main.trace("FileDrop: Hierarchy changed." );
        Component parent = c.getParent();
        if( parent == null )

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     * @return {@code pane}
     * @since 5493
     */
    public static final Component prepareResizeableOptionPane(final Component pane, final Dimension minDimension) {
        if (pane != null) {
            pane.addHierarchyListener(new HierarchyListener() {
                @Override
                public void hierarchyChanged(HierarchyEvent e) {
                    Window window = SwingUtilities.getWindowAncestor(pane);
                    if (window instanceof Dialog) {
                        Dialog dialog = (Dialog)window;

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        splitter.setContinuousLayout(true);


        //This little bit of tedium is so we can set our size based on window's size. This listens
        //for when the window is actually shown. It then adds a listen to store the location.
        splitter.addHierarchyListener(new HierarchyListener() {
            public void hierarchyChanged(HierarchyEvent e) {
                if (HierarchyEvent.SHOWING_CHANGED == (e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED)) {
                    splitter.removeHierarchyListener(this); //we only want the first one of these, so remove ourselves as a listener.
                    Window window = SwingUtilities.getWindowAncestor(splitter);
                    if (window != null) {

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            public void valueChanged(ListSelectionEvent evt) {
                interceptMethodListValueChanged(evt);
            }
        });
        _manualEdit.setUI(this);
        addHierarchyListener(new HierarchyListener() {
            public void hierarchyChanged(HierarchyEvent e) {
              SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                        installShortcuts();
                }

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            if (credentials == null) {
                // prompt for username and password
                JTextField uField = new JTextField(15);
                uField.setText(username);
                JPasswordField pField = new JPasswordField(15);
                pField.addHierarchyListener(new HierarchyListener() {
                    public void hierarchyChanged(HierarchyEvent e) {
                        final Component c = e.getComponent();
                        if (c.isShowing() && (e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
                            Window toplevel = SwingUtilities.getWindowAncestor(c);
                            toplevel.addWindowFocusListener(new WindowAdapter() {

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        final DropTarget dt = new DropTarget();
        dt.addDropTargetListener(dropListener);


        // Listen for hierarchy changes and remove the
        // drop target when the parent gets cleared out.
        c.addHierarchyListener(new HierarchyListener()
        {
            public void hierarchyChanged(HierarchyEvent evt)
            {
                Component parent = c.getParent();
                if (parent == null) {

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