Code
class Task extends SwingWorker<Integer, ProgressValue> {
private final int lengthOfTask;
private final int randomSleep = new Random().nextInt(100) + 1;
public Task(int lengthOfTask) {
super();
this.lengthOfTask = lengthOfTask;
}
@Override protected Integer doInBackground() {
int current = 0;
while (current < lengthOfTask && !isCancelled()) {
current++;
try {
Thread.sleep(randomSleep);
} catch (InterruptedException ie) {
break;
}
publish(new ProgressValue(lengthOfTask, current));
}
return randomSleep * lengthOfTask;
}
}
class ProgressValue {
private final Integer progress;
private final Integer lengthOfTask;
public ProgressValue(Integer lengthOfTask, Integer progress) {
this.progress = progress;
this.lengthOfTask = lengthOfTask;
}
public Integer getProgress() {
return progress;
}
public Integer getLengthOfTask() {
return lengthOfTask;
}
}
class ProgressRenderer extends DefaultTableCellRenderer {
private final JProgressBar progress = new JProgressBar();
private final JPanel renderer = new JPanel(new BorderLayout());
@Override public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
Component c;
renderer.removeAll();
progress.setValue(0);
if (value instanceof ProgressValue) {
ProgressValue pv = (ProgressValue) value;
Integer current = pv.getProgress();
Integer lengthOfTask = pv.getLengthOfTask();
if (current < 0) {
c = super.getTableCellRendererComponent(
table, "Canceled", isSelected, hasFocus, row, column);
} else if (current < lengthOfTask) {
progress.setValue(current * 100 / lengthOfTask);
progress.setStringPainted(true);
progress.setString(String.format("%d/%d", current, lengthOfTask));
renderer.add(progress);
c = renderer;
} else {
c = super.getTableCellRendererComponent(
table, "Done", isSelected, hasFocus, row, column);
}
} else {
c = super.getTableCellRendererComponent(
table, "Waiting...", isSelected, hasFocus, row, column);
}
return c;
}
@Override public void updateUI() {
super.updateUI();
setOpaque(true);
if (Objects.nonNull(renderer)) {
SwingUtilities.updateComponentTreeUI(renderer);
}
}
}
References
