Re: disabling mouse scroll on GtkComboBox and spin buttons

[Franco Broi <franco bordernet com au>]

I sent a post about this in January. My solution retains the scrolling
feature but disables it when scrolling the parent window. 

Note that each combobox is inside an event box and
hence the gtk_bin_get_child in combobox_scroll_fix.

static gboolean _block_scroll = TRUE;

static void
combobox_no_scroll(GtkWidget *combo, gpointer data){
    if(_block_scroll) g_signal_stop_emission_by_name(combo, "scroll-event");
}

static void
combobox_focus_in(GtkWidget *combo, gpointer data){
    _block_scroll = TRUE;
}

static void
combobox_motion_notify(GtkWidget *combo, gpointer data){
    _block_scroll = FALSE;
}

static void
combobox_scroll_fix(GtkWidget *w){
    g_signal_connect(w, "enter-notify-event",  G_CALLBACK(combobox_focus_in),      NULL);
    g_signal_connect(w, "motion-notify-event", G_CALLBACK(combobox_motion_notify), NULL);
    g_signal_connect(gtk_bin_get_child(GTK_BIN(w)), "scroll-event", G_CALLBACK(combobox_no_scroll), NULL);
}


On Sun, 2016-05-22 at 23:38 +0530, Lokesh Chakka wrote:
> thanks guys....
>
> I am using like this:
>
> g_signal_connect( spin_button, "scroll-event", G_CALLBACK(gtk_true), NULL );
> g_signal_connect( combo_box, "scroll-event", G_CALLBACK(gtk_true), NULL );
>
> issue resolved......
>
> Thanks & Regards
> --
> Lokesh Chakka,
> Mobile: 9731023458
>
> On Sun, May 22, 2016 at 8:48 PM, Ben Iofel <iofelben gmail com> wrote:
>
> > There's a utility function for just returning true: gtk_true
> >
> > On Sun, May 22, 2016, 6:53 AM <jcupitt gmail com> wrote:
> >
> > > On 22 May 2016 at 10:57, Florian Pelz <pelzflorian pelzflorian de>
> > wrote:
> > > > On 05/22/2016 11:54 AM, jcupitt gmail com wrote:
> > > > > x = gtk_combo_box_new_text();
> > > > > g_signal_connect(x, "scroll-event", G_CALLBACK(true_cb), NULL);
> > > > > ...
> > > >
> > > > Ah yes, this is a much better way.
> > >
> > > I'm not sure it'd work for spin buttons though :-(
> > >
> > > Something like your event masks, Florian, would probably be necessary for
> > > that.
> > >
> > > John
> > > _______________________________________________
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