Here's the working example as promised in the comments:
import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class JTreeMultiSelect extends JFrame{
public JTreeMultiSelect() {
super("Test");
JTree myTree = new JTree();
myTree.getSelectionModel()
.setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
// add MouseListener to tree
MouseAdapter ma = new MouseAdapter() {
private void myPopupEvent(MouseEvent e) {
int x = e.getX();
int y = e.getY();
JTree tree = (JTree)e.getSource();
TreePath path = tree.getPathForLocation(x, y);
if (path == null)
return;
DefaultMutableTreeNode rightClickedNode =
(DefaultMutableTreeNode)path.getLastPathComponent();
TreePath[] selectionPaths = tree.getSelectionPaths();
//check if node was selected
boolean isSelected = false;
if (selectionPaths != null) {
for (TreePath selectionPath : selectionPaths) {
if (selectionPath.equals(path)) {
isSelected = true;
}
}
}
//if clicked node was not selected, select it
if(!isSelected){
tree.setSelectionPath(path);
}
//todo : create custom JMenuItem that takes the selectionPaths as parameter
// and do the action for each node (using getLastPathComponent)
if(rightClickedNode.isLeaf()){
JPopupMenu popup = new JPopupMenu();
final JMenuItem refreshMenuItem = new JMenuItem("refresh");
refreshMenuItem.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("refresh!");
}
});
popup.add(refreshMenuItem);
popup.show(tree, x, y);
}
}
public void mousePressed(MouseEvent e) {
if (e.isPopupTrigger()) myPopupEvent(e);
}
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) myPopupEvent(e);
}
};
myTree.addMouseListener(ma);
JPanel myPanel = new JPanel();
myPanel.add(myTree);
this.add(myPanel);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}
public static void main(String[] args) {
new JTreeMultiSelect();
}
}