Re: Glade 2 & passing data to signal handlers

[Russell Shaw <rjshaw iprimus com au>]

Joe Scaduto wrote:
> Hey I am a newbie to GTK+ 2 and Glade 2.  I have been playing around
> with GTK and I understand the concept behind signals and events.  My
> problem arised when I decided to use Glade 2 and wanted to connect a
> 'clicked' signal for a 'modal' 'dialog' window 'button'.  When
> connecting any signal handler to a signal I know you can pass extra data
> to the handler if you wish.  In Glade 2 when connecting a signal you can
> also set the extra data and it casts it as a GTK_OBJECT.  In my
> callbacks.c file my handler is there: code snippet
>
> void on_okLoginButton_clicked(GtkButton *button, gpointer user_data)
> {
>   gtk_widget_destroy( GTK_WIDGET(user_data) );
> }
>
> My call to destroy the dialog window only destroys the button.  However
> when I change the widget to destroy to: GTK_WIDGET(button), everything
> works fine.  Seems to me something is reversed.  Also I went into my
> interface.c file and found the actual code to call the handler and found
> this:
>
> g_signal_connect_swapped((gpointer) okLoginButton, "clicked",
>                           G_CALLBACK (on_okLoginButton_clicked),
>                           GTK_OBJECT (loginDialog) );
>
> Where loginDialog is my dialog window I want to close.  
>
> If you actually read the whole thing and are willing to help a newbie
> out I would greatly appreciate any explanation of this if anyone has ran
> into this problem.

Maybe you need: g_signal_connect((gpointer) okLoginButton, "clicked",
                          G_CALLBACK (on_okLoginButton_clicked),
                          GTK_OBJECT (loginDialog) );