def test_should_be_able_to_get_items_from_list_binding(self):
list_model = ListModel.ListModel("items")
list_model.insert_item(0, "zero")
list_model.insert_item(1, "one")
list_model.insert_item(2, "two")
binding = Binding.ListBinding(list_model, "items")
items = binding.items
self.assertEqual(len(items), 3)
self.assertEqual(items[2], "two")
list_model.insert_item(0, "negative")
self.assertEqual(len(items), 4)
self.assertEqual(items[3], "two")
def test_table_widget_handles_pending_updates_in_close(self):
from nion.ui import Widgets
ui = TestUI.UserInterface()
def create_item(item):
return ui.create_label_widget(item)
widget = Widgets.TableWidget(ui, create_item)
list_model = ListModel.ListModel()
widget.bind_items(Binding.ListBinding(list_model, "items"))
with contextlib.closing(widget):
list_model.insert_item(0, "abc")
list_model.insert_item(1, "abc")
list_model.remove_item(0)
self.assertEqual(3, len(widget.pending_queued_tasks))
self.assertEqual(0, len(widget.pending_queued_tasks))
widget.run_pending_keyed_tasks()
def test_inserting_and_removing_item_into_binding_notifies_target(self):
list_model = ListModel.ListModel("items")
binding = Binding.ListBinding(list_model, "items")
list_copy = list()
def inserter(value: str, index: int) -> None:
list_copy.insert(index, value)
def remover(index: int) -> None:
del list_copy[index]
binding.inserter = inserter
binding.remover = remover
list_model.insert_item(0, "zero")
list_model.insert_item(1, "one")
self.assertEqual(len(list_copy), 2)
self.assertEqual(list_copy[1], "one")
list_model.remove_item(0)
self.assertEqual(len(list_copy), 1)
self.assertEqual(list_copy[0], "one")
