[Gtk-sharp-list] Cancel response of dialog conditionally

[Chris Howie]

On Mon, Mar 2, 2009 at 11:33 AM, Paul Lange <palango at gmx.de> wrote:
> I have a dialog which derives from Gtk.Dialog. It has an OK-Button. If
> this is clicked I want to do some tests. If they went right the dilog
> should close and the response should be ResponseType.Ok. (This is what
> currently works)
>
> If one of the tests fail I want to show some message dialogs and after
> that cancel the closing of the dialog and giving a response.
>
> So my question is if I can stop the closing of the dialog in a button
> click event or the Dialog.Response event and if yes - how do I do that.

On the button you can usually set the response to ResponseType.None.
This will prevent the button from closing the dialog.  Then you can do
your tests in the Clicked event handler and use Dialog.Respond to emit
the response yourself.

Note that if you are doing field verification, and this verification
is cheap CPU-wise (e.g. checking the length of a string, etc) then it
might be better to install Changed handlers on the fields and decide
each time a character is typed whether or not the fields are valid,
and set the OK button's Sensitive property accordingly.  This provides
immediate feedback to the user and doesn't force them to click the OK
button before finding out that there is an issue with the field
values.

-- 
Chris Howie
http://www.chrishowie.com
http://en.wikipedia.org/wiki/User:Crazycomputers