No content while using SWING + JUNG to refresh graph visualization

Question

I have following java code in my thread class:

@Override    
public void run() {

    JFrame window = new JFrame("Visualization POC");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    while (true) {
        window.setVisible(false);

        Layout<Node,Edge> layout = new CircleLayout<Node, Edge>(graph);
        layout.setSize(new Dimension(300, 300));

        BasicVisualizationServer<Node, Edge> vv = new BasicVisualizationServer<Node, Edge>(layout);
        vv.setPreferredSize(new Dimension(350, 350));
        vv.getRenderContext().setVertexFillPaintTransformer(new NodeColorTransformer());
        vv.getRenderContext().setEdgeDrawPaintTransformer(new EdgeColorTransformer());

        window.getContentPane().add(vv);
        window.pack();
        window.setVisible(true);

        try {
            Thread.sleep(ONE_SECOND);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

I want to use it to refresh state of graph visualization, but I got stuck on massive problem. When the block of code creating layout and setting content of JFrame is inside while loop it is not displayed in output window. When I place it before while, it works fine but it isn't that what I want. I run this thread via SpringUtilities.invokeLater in my main class.

I can see that the window is refresh, because it is blinking for a while. I'm looking forward for any tips.

Answer 1

You invoke your code from EDT thread. Any update to the component will be painted at the end of the EDT thread. Your thread will not exit

I have modified your code little, it works fine. please replace JLabel with your jung .

final JFrame window = new JFrame("Visualization POC");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final Random ran = new Random();

while (true) {


  SwingUtilities.invokeLater(new Runnable(){
public void run() {
    window.setVisible(false);

     JPanel panel = new JPanel();
     JLabel label = new JLabel();
      int nextInt = ran.nextInt(100);
     label.setText("Test Label"+String.valueOf(nextInt));
    System.out.println(nextInt);
     panel.add(label);

    window.getContentPane().removeAll();
    window.getContentPane().add(panel);
    window.pack();
    window.setVisible(true);


}

});

try {

     Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

}

}