id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
66	Dynamically updating a Pile causes exception	robla	ian	"Using pile.widget_list.append(myfield) to add a widget to an existing Pile causes two problems:[[BR]]
1.  The new field fails to render[[BR]]
2.  Navigating to where the widget should be causes an exception to be thrown

Snippet of IRC conversation on this subject:

(05:42:25 PM) wardi: hmm, that should work[[BR]]
[...][[BR]]
(05:45:27 PM) wardi: the way Pile is implemented atm it keeps two lists, one of the widgets and one describing how each is to be displayed (item_types)[[BR]]
(05:47:12 PM) wardi: you could build a new pile every time you want to add an item, or do self.pile.item_types.append(('flow', None)) after appending the widget[[BR]]
(05:48:02 PM) ***robla tries the item_types thing to see if that does the trick[[BR]]
(05:48:36 PM) wardi: but that's a bug.. it should be defaulting to something and not crashing the way you're seeing[[BR]]

To repro, run the attached script, hit ""ctrl n"" to create new fields, and then try to navigate to the bottom.  The script will bomb at that point.

"	defect	closed	major	Urwid 1.0.0	unknown		fixed