[news.eclipse.platform.swt] Re: SWT and UI Thread block

[Roland Tepp <roland@xxxxxxxxxxxx>]

Try this:

Control c = Display.getCurrent().getFocusControl();
if (c != null) {
     Menu old = c.getMenu();
     MenuManager mm = new MenuManager();
     for (String s : cats) {

       mm.add(new _Action(s, isSource));

     }

     final Menu m = mm.createContextMenu(c);
     c.setMenu(m);
     m.setVisible(true);
     while (isExternalTaskFinished()) {
        if (c.getDisplay().readAndDispatch()) c.getDisplay().sleep();
     }
     c.setMenu(old);
     m.dispose();
}


Mark Ingerman kirjutas mulle  midagi seesugust:
> I have a problem where I want the current UI execution to stop, and perform
> some other ui (not a dialog box), and wait until that task is finished
> before returning to the previous spot.
>
> I have code that is running inside GEF that wants to put up a menu when the
> end connection (mouse down) event is run.  I tried the following trick; it
> works on the MAC and under windows, but not under Linux.  I wonder if there
> is a better way.
>
> Here is the code:
>
>   do some code....
>
>   Control c = Display.getCurrent().getFocusControl();
>   if (c != null) {
>     Menu old = c.getMenu();
>     MenuManager mm = new MenuManager();
>     for (String s : cats) {
>
>       mm.add(new _Action(s, isSource));
>
>     }
>
>     final Menu m = mm.createContextMenu(c);
>     c.setMenu(m);
>     m.setVisible(true);
>     c.getDisplay().readAndDispatch();
>     c.setMenu(old);
>
>  }
>
>
>  finish the code....
>
>
> With the c.getDisplay().readAndDispatch() code in, the menu comes up, and
> until either one of the menu items are selected or ESC is pressed, the
> c.setMenu(old) statement and the following statements don't execute.
>
> Under Linux, however, it falls through, processes the rest of the event, and
> then allows for the firing of the menu.
>
> Is there a better way to do this?

--
  Roland Tepp