Re: Confused about radio menu items and signals

[Matt Postiff <postiffm gmail com>]

I tried same code on Windows with msys2, using gtk2 2.24.28 and it works 
correctly.

On Ubuntu Linux  14.04.4 trusty with gtk2 2.24.23 it fails to operate 
correctly.

I cannot condemn the library with 100% certainty, yet.

On 05/10/2016 02:48 PM, Matt Postiff wrote:
> Thank you...you are enough of an expert! I had a mistake in how I 
> connected the menu items together in a group. I had to init group=NULL 
> and then do
>     item = gtk_radio_menu_item_new_with_mnemonic (group, label);
>     group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (item));
>     three times in succession with A_item, B_item, and C_item
> Now I do not get the situation where A=B=1 at one and the same time.
>
> However, one 'feature' of my code still doesn't work. A,B, and C are 
> different views that a textview can show. If I have two textviews T1 
> and T2 open, and T1 is in B state, and T2 is in A state, if I change 
> active window from T1 to T2, the menu radio buttons are supposed to 
> change accordingly.
>
> So I should see a transition from state B to state A in the menu when 
> I change textview focus. My debugging code shows that indeed happens. 
> gtk_check_menu_item_set_active  is called to set the new active state 
> for the proper menu item. Everything shows the correct new state
> A=1 (found via  calling gtk_check_menu_item_get_active(A_item))
> B=0
> C=0
> However, even though B=0, the radio button next to B in the submenu is 
> highlighted, and the next to A is not! I've been pulling my hair out 
> on this...
>
> Matt
>
> On 05/09/2016 11:28 PM, Franco Broi wrote:
> > I'm no expert.., but seems like maybe your radio group isn't the same
> > for your 3 gtk_radio_menu_item_new_with_mnemonic calls, otherwise Gtk
> > handles toggling of the radio buttons for you.
> >
> > Note, to prevent your callback being triggered when you call
> > gtk_check_menu_item_set_active, you can use
> > g_signal_handlers_block_by_func or one of its variants.
> >
> > On Mon, 2016-05-09 at 22:34 -0400, Matt Postiff wrote:
> > > Hi,
> > >
> > > Still learning with gtk2. I have a menu with a submenu. That submenu
> > > contains items for three mutually exclusive states in my program: A, 
> > > B, and C.
> > > Each menu item is created with code like:
> > >       A_menu_item = gtk_radio_menu_item_new_with_mnemonic(group, 
> > > "label")
> > >
> > > In the constructor, my program does
> > >       gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM 
> > > (A_menu_item),
> > > true); // default
> > > to set the checkmark next to A to start things.
> > >
> > > Then if the user clicks on Menu | Submenu | B, it was my understanding
> > > that B would get the checkmark/true, and A's checkmark would be auto
> > > erased/false and I could process what is necessary when B becomes true.
> > >
> > > I have a shared handler for activate signal on these menu items, and
> > > when B is clicked, I see a situation where both A and B are true. What
> > > am I missing?
> > >
> > > I thought OK, maybe gtk leaves it to me to figure out which radio item
> > > needs to be turned on, and turn the rest off. But this has me call
> > >       gtk_check_menu_item_set_active(menuitem, false);
> > > for each of the menuitems that shouldn't be on. This generates more
> > > signals to my signal handler, and I end up with a mess of nested calls
> > > to the signal handler and my program gets totally confused, not to
> > > mention its author.
> > >
> > > Thanks for any guidance. You all have been helpful to me before :-)
> > >
> > > Matt
> > >
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