Re: Property Change Notifications

[Marc Mulcahy <marc mulcahy sun com>]

Hi Padraig,

At 03:02 PM 5/11/2001 +0100, Padraig O'Briain wrote:
> ...
> accessible-name
> accessible-description
>
>   These are implemented as standard Gobject properties and a 
> g_object_notify()
>   call is made when the property is changed.
>
> accessible-state
>
>   For accessible state the old and new values will be available but only
>   one of them will be set and will indicate how the state has changed;
>   e.g. if old_value is ATK_STATE_FOCUSED it means that the object has lost
>   focus and if the new value is ATK_STATE_FOCUSED it means that the object
>   has gained focus.
>
> Pardon my ignorance, but what is the reasoning behind not exposing all 
> state changes?

>   Changes of the following states will be notified:
>
>   ATK_STATE_FOCUSED
>
> Originally this was implemented by by specifying a signal handler for
> focus-in and focus-out events on the GtkWidget. I would prefer to
> implement usoing "has-focus" property of GtkWidget but there are issues
> in GTK with property notifications that are holding me up at the moment.
>
>
>   ATK_STATE_DEFUNCT
>
> When the AtkObject corresponding to the widget is created a signal handler
> for the "destroy" signal on the widget is specified in the call to
> gtk_accessible_connect_widget_destroyed() which is called from
> gail_widget_set_widget() which is called each time a widget's accessible
> is created. When the signal handler, gail_widget_destroyed(), is called
> a property changed signal is emitted for the property "accessible-state" with
> the new value being ATK_STATE_DEFUNCT.
>
>
>   ATK_STATE_VISIBLE
>
> I hope to associate this with the GtkWidget property "visible".
>
>   ATK_STATE_SHOWING
>
> I hope to associate this with the GtkWidget property ""mapped".
>
>
> The others I can think of offhand are ATK_STATE_CHECKED 
> ATK_STATE_EXPANDED/ATK_STATE_COLLAPSED.


Marc




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