Ain't JDialog tricky?

[DeMarcus]

Hi,

Why can't I set a title on a JDialog unless I give it an owner?

The problem is that I have a JPanel that fires the JDialog, but
how do I provide the JDialog with a valid owner? Somehow I need
to get hold of a Dialog or a Frame according to the JDialog's
constructors. But how can a JPanel get hold of that?

One thing that makes me believe there's a solution is the dirty
way of creating a JOptionPane and use the createDialog(). What's
that function doing behind the scenes?

Thanks.

~ Daniel

 

[Michiel Konstapel]

The problem is that I have a JPanel that fires the JDialog, but

how do I provide the JDialog with a valid owner? Somehow I need
to get hold of a Dialog or a Frame according to the JDialog's
constructors. But how can a JPanel get hold of that?

Just walk up getParent() recursively until you get a component that's a
(subclass of) Window or JWindow.
I think there's even a Swing utility method that does just that.
HTH,
Michiel

 

[John McGrath]

Just walk up getParent() recursively until you get a component that's a
(subclass of) Window or JWindow. I think there's even a Swing utility
method that does just that.

SwingUtilities.getWindowAncestor( Component ).

 

[Steve W. Jackson]

:Hi,
:
:Why can't I set a title on a JDialog unless I give it an owner?
:
:The problem is that I have a JPanel that fires the JDialog, but
:how do I provide the JDialog with a valid owner? Somehow I need
:to get hold of a Dialog or a Frame according to the JDialog's
:constructors. But how can a JPanel get hold of that?
:
:One thing that makes me believe there's a solution is the dirty
:way of creating a JOptionPane and use the createDialog(). What's
:that function doing behind the scenes?
:
:Thanks.
:
: ~ Daniel

I'm not sure why you say you can't set the title without an owner. Of
course you can. It inherits setTitle from Dialog. And you can invoke
numerous constructors that take a title which will also allow a null
value for the owner frame or dialog.

Others have posted replies on getting the containing window of that
JPanel, but you should note that it inherits from JComponent the
getTopLevelAncestor method that returns the highest level ancestor of
itself. If it's in a window (which frames and dialogs all have as a
common ancestor class), it returns that. If it's in an applet, it
returns that.

= Steve =

 

[DeMarcus]

SwingUtilities.getWindowAncestor( Component ).

Ok, thanks.

 

[DeMarcus]

I'm not sure why you say you can't set the title without an owner. Of
course you can. It inherits setTitle from Dialog. And you can invoke
numerous constructors that take a title which will also allow a null
value for the owner frame or dialog.

Others have posted replies on getting the containing window of that
JPanel, but you should note that it inherits from JComponent the
getTopLevelAncestor method that returns the highest level ancestor of
itself. If it's in a window (which frames and dialogs all have as a
common ancestor class), it returns that. If it's in an applet, it
returns that.

= Steve =

Ok, thanks.