Custom JComboBox hiding JPopupMenu

Question

I'm having a little headache with a situation. Maybe some of you have been through this before and can show me another way or even my error here.

I need to add a JTree inside a JComboBox and the code below works like a charm.

public class HierarchyComboBox extends JComboBox {
    HierarchyTree ht = new HierarchyTree();
    HierarchyComboBox box;
    JPopupMenu popup;
    MouseAdapter adapter = new MouseAdapter() { 
        @Override
        public void mouseClicked(MouseEvent arg0) {
            if (arg0.getClickCount() == 1) {
                removeAllItems();
                addItem(ht.getSelectedLevel());
//              ((JPopupMenu) comp).setVisible(false);
            }
        }
    };


    PopupMenuListener listener = new PopupMenuListener() {
        @Override
        public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
            if (box == null) {
                box = (HierarchyComboBox) e.getSource();
                if (popup == null) {
                    final Object comp = box.getUI().getAccessibleChild(box, 0);
                    if (!(comp instanceof JPopupMenu))
                        return;
                    popup = (JPopupMenu) comp;
                }
                popup.removeAll();
                ht.getTreePane().setBorder(null);
                ht.getTreePane().setPreferredSize(new Dimension(box.getWidth(), 200));
                MyTree tree = (MyTree)ht.getTreePane().getViewport().getComponent(0);
                tree.addMouseListener(adapter);
                popup.add(ht.getTreePane());
            }
        }
        @Override
        public void popupMenuCanceled(PopupMenuEvent arg0) { }
        @Override
        public void popupMenuWillBecomeInvisible(PopupMenuEvent arg0) { }
    };

    public HierarchyComboBox() {
        setEditable(true);
        addPopupMenuListener(listener);
    }
}

but I added this component to 2 different dialogs.
The first one I can click and the selection is added to the JComboBox

and the second, doing EXACTLY the same instantiation, and the same tests

The component has a different behaviour:
- The JPopupMenu disappears
- It doesn't add the selection to the combo

Any ideas here?
Thanks in advance..

score 2 · Answer 1 · edited May 23 '17 at 12:21

2

As shown in Providing a Custom Renderer, "A combo box uses a renderer to display each item in its menu." You could render the tree in a custom ListCellRenderer. Alternatively,

Render the tree in an adjacent component in response to an ActionListener.
Use a hierarchical model, shown here.

edited May 23 '17 at 12:21

Community

1
1

answered Jul 04 '13 at 14:23

trashgod

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In this case, it would render the entire tree in one option. Is this what you're saying? – Gabriel Câmara Jul 04 '13 at 14:36
Yes, but I prefer your popup approach as the other component. – trashgod Jul 04 '13 at 18:00
Exactly. I solved the problem. But thanks for the answer, @trashgod – Gabriel Câmara Jul 04 '13 at 18:57

score 1 · Answer 2 · answered Jul 04 '13 at 14:53

1

I noticed that the JPopupMenu was loosing it's focus.

The solution was to add the component as the last component of the Panel.

answered Jul 04 '13 at 14:53

Gabriel Câmara

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1

Yes, I can, but not now. It tells me to wait 2 days. You can accept your own answer in 2 days – Gabriel Câmara Jul 04 '13 at 19:27

Custom JComboBox hiding JPopupMenu

2 Answers2