single click opens ang closes a group

src/net/java/sip/communicator/impl/gui/main/contactlist/ContactList.java

@@ -537,6 +537,31 @@ public void mousePressed(MouseEvent e)
             }
             else if ((e.getModifiers() & InputEvent.BUTTON1_MASK) != 0){
                 fireContactListEvent(group, ContactListEvent.GROUP_SELECTED);
+                
+                //get the component under the mouse
+                Component component = this.getHorizontalComponent(renderer,
+                        translatedX);
+                
+                if (component instanceof JPanel) {
+                    if (component.getName() != null
+                            && component.getName().equals("buttonsPanel")) {
+                        JPanel panel = (JPanel) component;
+
+                        int internalX = translatedX
+                                - (renderer.getWidth() - panel.getWidth() - 2);
+
+                        Component c = getHorizontalComponent(panel, internalX);
+                        
+                        if (c instanceof JLabel) {
+                            if (listModel.isGroupClosed(group)) {
+                                listModel.openGroup(group);
+                            }
+                            else {
+                                listModel.closeGroup(group);
+                            }
+                        }
+                    }
+                }
             }
         }
 

src/net/java/sip/communicator/impl/gui/main/contactlist/ContactListCellRenderer.java

@@ -35,7 +35,7 @@ public class ContactListCellRenderer extends JPanel
     private JLabel nameLabel = new JLabel();
 
     private JPanel buttonsPanel;
-
+    
     private SIPCommButton extendPanelButton = new SIPCommButton(ImageLoader
             .getImage(ImageLoader.MORE_INFO_ICON), ImageLoader
             .getImage(ImageLoader.MORE_INFO_ICON));
@@ -186,13 +186,26 @@ public Component getListCellRendererComponent(JList list, Object value,
             //this.remove(buttonsPanel);
             this.buttonsPanel.removeAll();
             
+            JLabel groupContentIndicator = new JLabel();
+            
             if(((ContactListModel)list.getModel()).isGroupClosed(groupItem))
-                this.buttonsPanel.add(new JLabel(new ImageIcon(ImageLoader
-                    .getImage(ImageLoader.CLOSED_GROUP))));
+                groupContentIndicator.setIcon(new ImageIcon(ImageLoader
+                    .getImage(ImageLoader.CLOSED_GROUP)));
             else 
-                this.buttonsPanel.add(new JLabel(new ImageIcon(ImageLoader
-                    .getImage(ImageLoader.OPENED_GROUP))));
+                groupContentIndicator.setIcon(new ImageIcon(ImageLoader
+                    .getImage(ImageLoader.OPENED_GROUP)));
 
+            //the width is fixed in 
+            //order all the icons to be with the same size
+            groupContentIndicator.setBounds(0, 0, 12, 12);
+            this.buttonsPanel.setPreferredSize(
+                    new Dimension(17, 16));
+            this.buttonsPanel.setBounds(
+                    list.getWidth() - 2 - 17, 0,
+                    17, 16);
+            
+            this.buttonsPanel.add(groupContentIndicator);
+            
             this.isLeaf = false;
         }