Question

I do have a strange focus problem when using a JComboBox inside an embedded frame.

i created a new Shell like

shell = new Shell(display.getActiveShell(), SWT.SHELL_TRIM | SWT.APPLICATION_MODAL);

The shell i use to create an embedded frame like

    Composite contentComposite = new Composite(parent, SWT.EMBEDDED);
    contentComposite.setLayout(new FillLayout());

    frame = SWT_AWT.new_Frame(contentComposite);
    rootPanel = new Panel();
    rootPanel.setLayout(new BorderLayout());
    frame.add(rootPanel);

I added a JComboBox (with 2 elements) to the rootPanel.
When i select the ComboBox for opening the drop down menue, i can drag and drop the shell window, without losing the focus in the combo box.

The drop down menue is still in the same place on the screen, also when the shell window is moving to another screen area. The drop down menue is not shown below the combo box anymore.

i tried to add a focus listener to some of the components, but the focus is not lost on the combo box and not gained on the shell.

So how can i hide the popup of the combo box, when the shell is moved or gets the focus.

Answer 1

After Andrew Thompson described in his comment, that 3 different UI libraries are not the best choice, i started to try the AWT Choice class.

These class is losing the focus, when the shell window is selected.

So it seems, that swing can not be used so easily in embedded AWT objects, but the reason i dont see yet.