Dynamically changing icons of some nodes in a JTree

**vishnu_knl** · 10-22-2012, 02:58 PM

Hi,

I am looking to change the icons in a Jtree nodes depending on some condition. For Example I am populating n number of Jobs in the Jtree under a single parent by reading a folder for xml files.
and some of the jobs might be currently running and i wish to show the icons for these running jobs with a green dot to differentiate them from other jobs. As follows

Jobs
#job1
#job2
#job3

[OR]

Jobs
#job1
#job2
#job3

I just need to differentiate it from other jobs be it the icon changing or the text color changing.
Any suggestions?

Regards
--vishnu--

**KevinWorkman** · 10-22-2012, 03:14 PM

Sounds like a job for a renderer. Recommended reading: How to Use Trees (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

**vishnu_knl** · 10-22-2012, 03:23 PM

Thank you Kevin! But i have already been through this link and cant find any help. i tried the following scenario just to change the images and it did not work.
I tried whit a sleep of 1000 and i can only see the blue icon always. The green doesnt seem to show up atall even after i adjust the sleep timing. If i remove the call for the changeNodeIcons11(), then i can see the green icons.

private void jButton_changeActionPerformed(java.awt.event.Actio nEvent evt) {
// TODO add your handling code here:
changeNodeIcons();

try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(EasyLoaderPro.class.getName()).lo g(Level.SEVERE, null, ex);
}

changeNodeIcons1();

}

public void changeNodeIcons() {

ImageIcon greenIcon = new ImageIcon(".\\src\\treetest\\images\\greendot.gif" );
DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) job_tree.getCellRenderer();

if (greenIcon != null) {
System.out.println("Green icon Found");
renderer.setLeafIcon((Icon) greenIcon);
job_tree.setCellRenderer(renderer);
job_tree.invalidate();
job_tree.repaint();

} else {
System.err.println("Leaf icon missing; using default.");
}

}
public void changeNodeIcons1() {

ImageIcon blueIcon = new ImageIcon(".\\src\\treetest\\images\\bluedot.gif") ;
DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) job_tree.getCellRenderer();

if (blueIcon != null) {

renderer = (DefaultTreeCellRenderer) job_tree.getCellRenderer();
renderer.setLeafIcon((Icon) blueIcon);
job_tree.setCellRenderer(renderer);
job_tree.invalidate();
job_tree.repaint();
} else {
System.err.println("Leaf icon missing; using default.");
}

}

**KevinWorkman** · 10-22-2012, 03:42 PM

Don't call Thread.sleep() on the EDT. You won't be able to see anything happening while the EDT is sleeping, since you're blocking the painting thread.

**KevinWorkman** · 10-22-2012, 03:46 PM

Nevermind, crossposted: Dynamically changing icons of some nodes in a JTree

**vishnu_knl** · 10-22-2012, 03:52 PM

Kevin,
I appreciate your help very much.

Its' just that I did not know that these two forums are the same. I thought they were different. If not i would never have cross posted this. I was just looking for a quick solution and hence thought i might get different people on different forums .