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"""Example of using low-level `QtListView` with SelectableEventedList
:class:`napari.utils.events.SelectableEventedList` is a mutable sequence that
emits events when modified. It also has a selection model (tracking which
items are selected).
:class:`napari._qt.containers.QtListView` adapts the `EventedList` to the
QAbstractItemModel/QAbstractItemView interface used by the QtFramework. This
allows you to create an interactive GUI view onto a python model that stays
up to date, and can modify the python object... while maintining the python
object as the single "source of truth".
"""
import napari
from napari._qt.containers import QtListView
from napari.qt import get_qapp
from napari.utils.events import SelectableEventedList
get_qapp()
class MyObject:
"""generic object."""
def __init__(self, name) -> None:
self.name = name
def __str__(self):
return self.name
# create our evented list
root = SelectableEventedList([MyObject(x) for x in 'abcdefg'])
# create Qt view onto the list
view = QtListView(root)
# show the view
view.show()
# spy on events
root.events.reordered.connect(lambda e: print('reordered to: ', e.value))
root.selection.events.changed.connect(
lambda e: print(
f'selection changed. added: {e.added}, removed: {e.removed}'
)
)
root.selection.events._current.connect(
lambda e: print(f'current item changed to: {e.value}')
)
if __name__ == '__main__':
napari.run()
|
