def __init__(self, width, height, collection=None):
# Temporary placeholder for kwargs of the update() method.
self.__lastargs = None
ScrolledWindow.__init__(self, width, height)
self._spacing = 0
# The item cursor position within the list.
self._cursor = None
# Used for selections.
self._last_direction = None
self._signals[SIG_LISTCHANGED] = []
self._signals[SIG_SELECTCHANGED] = []
# Items and selection.
self._itemcollection = None
self._selectionmode = SELECTION_MULTIPLE
if collection:
self.set_items(collection)
else:
self._itemcollection = ListItemCollection()
self._itemcollection.list_changed = self._list_has_changed
self._itemcollection.item_changed = self._item_has_changed
self.child = ListViewPort(self)
