Adding right click menu to to treeitem in SWT tree

Question

How can I add a right click popup menu to a treeitem in a SWT Tree. Each treeitem should have a right click enabled on it

Phosphorous

@dic19 I have to use only SWT.Adding a listener to a treeitem with event as SWT.MenuDetect is not working – Phosphorous

Answer 1

Just use tree.setMenu(Menu).

There you go:

public static void main(String[] args)
{
    Display display = Display.getDefault();
    final Shell shell = new Shell(display);
    shell.setText("StackOverflow");
    shell.setLayout(new FillLayout());

    final Tree tree = new Tree(shell, SWT.NONE);

    for(int i = 0; i < 10; i++)
    {
        TreeItem item = new TreeItem(tree, SWT.NONE);
        item.setText("Parent " + i);

        for(int j = 0; j < 3; j++)
        {
            TreeItem child = new TreeItem(item, SWT.NONE);
            child.setText("Child " + i + " " + j);
        }
    }

    final Menu menu = new Menu(tree);
    tree.setMenu(menu);
    menu.addMenuListener(new MenuAdapter()
    {
        public void menuShown(MenuEvent e)
        {
            MenuItem[] items = menu.getItems();
            for (int i = 0; i < items.length; i++)
            {
                items[i].dispose();
            }
            MenuItem newItem = new MenuItem(menu, SWT.NONE);
            newItem.setText("Menu for " + tree.getSelection()[0].getText());
        }
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

Machinist

Is there a way to lock the showing of the menu only for the first level of the tree? For example, to be shown only for the root. – Pianoforte

@Pianoforte You'd need to add a MenuDetectListener to the Tree and check the level of the item. Then set MenuDetectEvent#doit to false if you don't want the menu. Post a new question if you can't get it to work and I'll post a detailed answer. – Machinist

Can you tell me how to get the level of an item of a tree though? – Pianoforte

@Pianoforte I guess you'll have to call getParentItem() on the TreeItem until it returns null and count. – Machinist

And where do I have to set the doit attribute? Before or after the menu's listener? – Pianoforte

@Pianoforte Inside the MenuDetectListener. It's separate from the MenuAdapter. The MenuDetectListener will be called first, consequently it can prevent the menu from showing up at all by setting e.doit = false. – Machinist

I got the concept. Thing is that I've done it like this. final Menu treeMenu = new Menu(variantTree); variantTree.setMenu(treeMenu); variantTree.addMenuDetectListener(new MenuDetectListener(){ @Override public void menuDetected(MenuDetectEvent event) { // TODO Auto-generated method stub if(variantTree.getParentItem() instanceof TreeItem){ event.doit = false; }else{ event.doit = true; } } }); It doesnt work even though I know the parent is null. Sorry, i was banned to post any questions anymore. – Pianoforte

For the menu to enable, the parent has to be null. – Pianoforte