Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Franco Broi 

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  wrote:
> 
> > There's a utility function for just returning true: gtk_true
> >
> > On Sun, May 22, 2016, 6:53 AM  wrote:
> >
> > > On 22 May 2016 at 10:57, Florian Pelz 
> > wrote:
> > > > On 05/22/2016 11:54 AM, jcup...@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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> > > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> > >
> > ___
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> >
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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Lokesh Chakka 
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  wrote:

> There's a utility function for just returning true: gtk_true
>
> On Sun, May 22, 2016, 6:53 AM  wrote:
>
> > On 22 May 2016 at 10:57, Florian Pelz 
> wrote:
> > > On 05/22/2016 11:54 AM, jcup...@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
> > ___
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list@gnome.org
> > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> >
> ___
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> gtk-app-devel-list@gnome.org
> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Ben Iofel 
There's a utility function for just returning true: gtk_true

On Sun, May 22, 2016, 6:53 AM  wrote:

> On 22 May 2016 at 10:57, Florian Pelz  wrote:
> > On 05/22/2016 11:54 AM, jcup...@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
> ___
> gtk-app-devel-list mailing list
> gtk-app-devel-list@gnome.org
> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread jcupitt 
On 22 May 2016 at 10:57, Florian Pelz  wrote:
> On 05/22/2016 11:54 AM, jcup...@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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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Florian Pelz 
On 05/22/2016 11:54 AM, jcup...@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.
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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread jcupitt 
On 22 May 2016 at 07:36, Lokesh Chakka  wrote:
> Is there a way to disable mouse scroll on GtkComboBox and GtkSpinButton
> widgets ?

Yes, the mouse wheel to change the combo drives me CRAZY.

It means you can't use the mouse wheel to scroll a window that
contains widgets, since you might scroll a combo under the pointer
accidentally, and then you start changing the combo value instead of
scrolling. And once you've changed it, you can't change it back,
because you've no idea what it was set to before.

I block this in my code by connecting to scroll-event on the combo, for example:

x = gtk_combo_box_new_text();
g_signal_connect(x, "scroll-event", G_CALLBACK(true_cb), NULL);
...

where

static gboolean
true_cb(GtkWidget *wid, GdkEvent *event, void *data)
{
/* Stop any other scroll handlers running. We don't want the scroll
 * wheel to accidentally change widgets while we're moving.
 */
return TRUE;
}

John
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Re: disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Florian Pelz 
On 05/22/2016 08:36 AM, Lokesh Chakka wrote:
> Hello,
> 
> Is there a way to disable mouse scroll on GtkComboBox and GtkSpinButton
> widgets ?
> 
> an example will help much.
> 
> Thanks & Regards
>

Use a function like

static void
disable_scroll (GtkWidget *widget)
{
  GdkEventMask events;
  events = gtk_widget_get_events (widget);
  events &= ~0 ^ GDK_SCROLL_MASK;
  gtk_widget_set_events (widget, events);

  if (GTK_IS_CONTAINER (widget))
gtk_container_forall (GTK_CONTAINER (widget),
  (GtkCallback) disable_scroll,
  NULL);
}

and then after creating the GtkComboBox call

gtk_container_forall (GTK_CONTAINER (combo),
  (GtkCallback) disable_scroll,
  NULL);

It seems to work for me on a GtkComboBox called combo, but I'm not sure
if it will survive on future GTK+ versions.

Regards,
Florian
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disabling mouse scroll on GtkComboBox and spin buttons

2016-05-22 Thread Lokesh Chakka 
Hello,

Is there a way to disable mouse scroll on GtkComboBox and GtkSpinButton
widgets ?

an example will help much.

Thanks & Regards
--
Lokesh Chakka,
Mobile: 9731023458
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