[sugar] Another pass through some basic Activity test results

[Erik Blankinship]

>
> In Sugar, there's always one and only one active activity. You can see
> which it is by looking at the icon below the XO in the favorites view
> or by looking at the selected activity button in the top frame. This
> is the activity that will be brought to the front when you go to the
> Activity zoom level.
>
> I'm guessing Measure uses its "active activity" status to decide if it
> should update itself or not, but from earlier emails I think the
> desired behavior is rather to stop updating while the activity window
> is not visible. For this, the activity author can use the information
> that the window manager (or is it X?) provides to each top level
> window, in pygtk:
>
>
> http://pygtk.org/docs/pygtk/class-gtkwidget.html#signal-gtkwidget--visibility-notify-event
>
> Just listen for that signal and check the value of event.state, it can
> be one of gtk.gdk.VISIBILITY_FULLY_OBSCURED,
> gtk.gdk.VISIBILITY_PARTIAL or gtk.gdk.VISIBILITY_UNOBSCURED. You will
> want to stop updating the screen when fully obscured and update it
> otherwise.
>
> Faisal, could you please update the almanac with this info?
>

The basics of this idea are in the almanac:

http://wiki.laptop.org/go/Sugar_Almanac#How_do_I_know_when_my_activity_is_.22active.22_or_not.3F
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