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Menu Removes Focus

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  Menu Removes Focus "Jason Cavett" <jason.cavett@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000
    Re: Menu Removes Focus "Steve W. Jackson" <steve.w..jackson@THRWHITE.remove-dii-this> - 2011-04-27 15:40 +0000

#2627 — Menu Removes Focus

  To: comp.lang.java.gui,comp.l
I'm curious - how do I know what component has focus when I need to
pop up a menu to complete a task.

For example, in my JTree, I have a popup menu that comes up when I
right click on the tree.  Well, the JTree is the "real" object that
has focus (for a paste/cut/copy/whatever), but now that the menu is
shown, Java thinks it is the thing to have the real focus.

Hopefully that makes sense.


Thanks

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#2645

  To: comp.lang.java.gui,comp.l
In article <1192199555.846573.118100@v29g2000prd.googlegroups.com>,
 Jason Cavett <jason.cavett@gmail.com> wrote:

> I'm curious - how do I know what component has focus when I need to
> pop up a menu to complete a task.
> 
> For example, in my JTree, I have a popup menu that comes up when I
> right click on the tree.  Well, the JTree is the "real" object that
> has focus (for a paste/cut/copy/whatever), but now that the menu is
> shown, Java thinks it is the thing to have the real focus.
> 
> Hopefully that makes sense.
> 
> 
> Thanks

The popup really is the item with "real" focus in this case.  Only one 
component at any time can have "the focus" in your application.  When a 
popup is displayed, it's a window of a sort and deactivates the one 
containing your tree.  But you'll find in the API for Window (one of the 
superclasses to JDialog and JFrame) that there's a method named 
getMostRecentFocusOwner which will identify the Component owning the 
focus when the window regains focus.

HTH,
= Steve =
-- 
Steve W. Jackson
Montgomery, Alabama

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