XMPP communication development-Logic Design of the pop-up friend Communication dialog box

In QQ, we want to communicate with friends, select the group where the friends are located, and double-click the Friends option to bring up the chat dialog box. here we need to implement this step, I used the JTree component in the previous function of displaying the friend list. Therefore, a tree structure is displayed, which can be divided into root nodes, branch nodes, and leaf nodes, the node in the pop-up box is the leaf node. When we double-click the function, we need to make a judgment.

tree = new JTree (top);
             tree.addMouseListener (new MouseAdapter () {
                 @Override
                 public void mouseClicked (MouseEvent e) {
                     if (e.getClickCount () == 2) {
                          DefaultMutableTreeNode note = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent ();
                          if (note.isRoot ()) {
                              System.out.println ("root" + note.toString ());
                          } else if (note.isLeaf ()) {
                              System.out.println ("leaf node" + note.toString ());
                          } else {
                                System.out.println ("branch node" + note.toString ());
                          }
                     }
                     super.mouseClicked (e); // To change body of generated methods, choose Tools | Templates.
                 }
                
             });

I added a double-click mouse event to the JTree and checked the implementation effect of the above Code:

run:
root friend
root friend
Branch node customer
Leaf node
Leaf node

We can see from the above that the leaf node is what we want. When you double-click a branch node, we need to create a dialog box in which the JPanel design layout is used. When you double-click a friend, the chat dialog box is displayed. In the above Code, we add a dialog box function,

tree = new JTree (top);
            tree.addMouseListener (new MouseAdapter () {
                @Override
                public void mouseClicked (MouseEvent e) {
                    if (e.getClickCount () == 2) {
                         DefaultMutableTreeNode note = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent ();
                         if (note.isRoot ()) {
                             System.out.println ("root" + note.toString ());
                         } else if (note.isLeaf ()) {
                             System.out.println ("leaf node" + note.toString ());
                             ChatPanel chatPanel = new ChatPanel ();
                             JDialog chatDialog = new JDialog ();
                             chatDialog.setContentPane (chatPanel);
                             chatDialog.setSize (501, 512);
                             chatDialog.setVisible (true);
                         } else {
                             System.out.println ("branch node" + note.toString ());
                         }
                    }
                    super.mouseClicked (e); // To change body of generated methods, choose Tools | Templates.
                }
            }); 

As follows:

Of course, the current effect is only a box. If we want to implement communication, we need to rewrite this JDialog and pass the required parameters to JDialog. We will put this in the following chapter.