public static Image createImage(final JTree tree) {
final TreeSelectionModel model = tree.getSelectionModel();
final TreePath[] paths = model.getSelectionPaths();
int count = 0;
final List<ChangesBrowserNode> nodes = new ArrayList<ChangesBrowserNode>();
for (final TreePath path : paths) {
final ChangesBrowserNode node = (ChangesBrowserNode) path.getLastPathComponent();
if (!node.isLeaf()) {
nodes.add(node);
count += node.getCount();
}
}
for (TreePath path : paths) {
final ChangesBrowserNode element = (ChangesBrowserNode) path.getLastPathComponent();
boolean child = false;
for (final ChangesBrowserNode node : nodes) {
if (node.isNodeChild(element)) {
child = true;
break;
}
}
if (!child) {
if (element.isLeaf()) count++;
} else if (!element.isLeaf()) {
count -= element.getCount();
}
}
final JLabel label = new JLabel(VcsBundle.message("changes.view.dnd.label", count));
label.setOpaque(true);
label.setForeground(tree.getForeground());
label.setBackground(tree.getBackground());
label.setFont(tree.getFont());
label.setSize(label.getPreferredSize());
final BufferedImage image =
new BufferedImage(label.getWidth(), label.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.7f));
label.paint(g2);
g2.dispose();
return image;
}