Code
class ProgressCellRenderer extends DefaultListCellRenderer {
private final JProgressBar bar = new JProgressBar() {
@Override public Dimension getPreferredSize() {
return ProgressCellRenderer.this.getPreferredSize();
}
};
@Override public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
if(index < 0 && worker!=null && !worker.isDone()) {
bar.setFont(list.getFont());
bar.setBorder(BorderFactory.createEmptyBorder(0,0,0,0));
bar.setValue(count);
return bar;
}else{
return super.getListCellRendererComponent(
list,value,index,isSelected,cellHasFocus);
}
}
@Override public void updateUI() {
super.updateUI();
if(bar!=null) SwingUtilities.updateComponentTreeUI(bar);
}
}
//........
button = new JButton(new AbstractAction("load") {
@Override public void actionPerformed(ActionEvent e) {
button.setEnabled(false);
combo.setEnabled(false);
combo.removeAllItems();
worker = new SwingWorker<String, String>() {
private int max = 30;
@Override public String doInBackground() {
int current = 0;
while(current <= max && !isCancelled()) {
try {
Thread.sleep(50);
//setProgress(100 * current / max);
count = 100 * current / max;
publish("test: "+current);
}catch(Exception ie) {
return "Exception";
}
current++;
}
return "Done";
}
@Override protected void process(java.util.List< String > chunks) {
DefaultComboBoxModel m = (DefaultComboBoxModel)combo.getModel();
for(String s: chunks) {
m.addElement(s);
}
combo.setSelectedIndex(-1);
combo.repaint();
}
@Override public void done() {
String text = null;
if(!isCancelled()) {
combo.setSelectedIndex(0);
}
combo.setEnabled(true);
button.setEnabled(true);
count = 0;
}
};
worker.execute();
}
});
References
