Thread: Need help with my JTree add JScrollPane

Hello,


In my program I'm using JTree and I'm having problem with adding JScrollPane. Can somebody please help me?

mainTab = new JTabbedPane(JTabbedPane.TOP);
		mainTab.setBackground(Color.LIGHT_GRAY);
		frame.getContentPane().add(mainTab, BorderLayout.CENTER);
 
		JPanel panel = new JPanel();
		mainTab.addTab("New tab", null, panel, null);
		mainTab.setBackgroundAt(0, Color.WHITE);
		JScrollPane scrollPane = new JScrollPane(mainTab);
		frame.getContentPane().add(scrollPane);
		Container cp = new Container();
		panel.add(cp);
 
 
		Schools = new DefaultMutableTreeNode("Schools",true);
		model = new DefaultTreeModel(Schools);
		//model.addTreeModelListener(new MyTreeModelListener());
		EuropeanSchoolLuxembourg = new DefaultMutableTreeNode("School Name",true);
 
		Schools.add(EuropeanSchoolLuxembourg);
 
		treeNode2 = new DefaultMutableTreeNode("Building A");
		EuropeanSchoolLuxembourg.add(treeNode2);
 
		treeNode3 =new DefaultMutableTreeNode("Room A1");
		treeNode2.add(treeNode3);
		treeNode4 = new DefaultMutableTreeNode("Room A2");
		treeNode2.add(treeNode4);
 
 
		/*DefaultMutableTreeNode for Uni */
 
		Uni = new DefaultMutableTreeNode("Uni",true);
 
		treeNode2 = new DefaultMutableTreeNode("Building A");
		Uni.add(treeNode2);
 
		treeNode3 =new DefaultMutableTreeNode("Room A1");
		treeNode2.add(treeNode3);
		treeNode4 = new DefaultMutableTreeNode("Room A2");
		treeNode2.add(treeNode4);
		Schools.add(Uni);
 
		/* JTree */
 
		final JTree tree = new JTree(model);
		tree.setAutoscrolls(true);
		tree.setEditable(true);
 
		tree.setFont(new Font("Segoe UI Semibold", Font.PLAIN, 11));
		tree.setBorder(UIManager.getBorder("Tree.editorBorder"));
 
		/*JScrollPane*/
 
		JScrollPane treePane = new JScrollPane();
		treePane.setBounds(271, 11, 19, 154);
		treePane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		treePane.setViewportView(tree);
		cp.add(treePane, BorderLayout.CENTER);

I think that Im not adding the JScrollPane correctly, can somebody help me? Thank you very much for your Help

Oh I posted it here, coz It's in JFrame But maybe I should re-post it to the right directory

Oh silly me,

Well I cant add the JScrollPane to the tree. When I execute my code the JScrollPane isn't in the JTree.

Nope it doesn't I tried that as well. I don't know what I'm doing wrong.. It just doesn't work..I even tried to create another JPanel instead of the Container but still doesn't work

Well,

I have a JTabbledPane and on it I have several JPanels. On one of those JPanel there is a JTree. Jtree works fine except when I extend all the nodes, the JTree goes far beyond it's borders. And I need the JScrollPane to scroll down to see all the extended nodes.

But when I try to add the JScrollPane it doesn't show there. And I don't know why is the JScrollPane not working for me. I tried to make another JPanel or Container, but non of this work.

I'm going to post the whole code so that you can see what is going on: Maybe you can find there why it's not working for sure it's just some small mistake which I can't see.

Paste2 - Viewing Paste 1996330

Oki I'm going to try it. Let's hope that it will work

So I did it, here you can see the pic : http://i.imgur.com/g2ero.png

The ScrollPane is working here, the vertical is it possible to make a horizontal as well?

So why here it work and in my previous code it doesn't?

Strange thing just happened , I commented everything out nd made the frame small and JScrollPane appeared? O_o Why? Why I can't see it when the Jtree stretches? In my code I used treePane.setBounds() method.

Thank you I just fixed it Rly thx for your help. I was adding it to wrong place.