Re: When is a UIComponent hooked?

[Federico Mena Quintero <federico ximian com>]

Michael Meeks <michael ximian com> writes:

> On Mon, 21 May 2001, Federico Mena Quintero wrote:
> > Is there a way to know when a BonoboUIComponent gets connected to the
> > parent Bonobo_UIContainer?  If I could get notification about this I
> > could set the sensitivity of my commands as soon as I can.
>  
>         AFAIK no, however a solution neutral problem statement would be   
> good :-). Why is the container setting commands insensitive ? who
> initiates the state change ? why can the sensitivity change not be
> performed at the time of the user-initiated state change ? etc.          
> 
> 	It would be good to understand the problem before it gets
> forgotten and hacked around :-)

Okay, sorry if my question lacked context.

In the Evolution calendar I have the task list component, which embeds
itself as a control inside the Evolution shell.   If zero tasks are
selected I want the Edit/Delete and toolbar/Delete items to be
insensitive; if one or more tasks are selected, I want them to be
enabled.

However, it seems that I can get notifications about changes in the
selection *before* the task list control binds itself to the parent
container.  If I then call bonobo_ui_component_set_prop() before it is
hooked to its parent, I get warning spewage.

I had to fetch the container and test for it being non-NIL.

static void
selection_changed_cb (ETasks *tasks, int n_selected, gpointer data)
{
	BonoboControl *control;
	BonoboUIComponent *uic;
	Bonobo_UIContainer ui_container;

	control = BONOBO_CONTROL (data);

	uic = bonobo_control_get_ui_component (control);
	g_assert (uic != NULL);

	ui_container = bonobo_ui_component_get_container (uic);
	if (ui_container == CORBA_OBJECT_NIL)
		return;

	bonobo_ui_component_set_prop (uic, "/commands/TasksDelete", "sensitive",
				      n_selected == 0 ? "0" : "1",
				      NULL);
}

but that sucks.

  Federico