def add_action(callback: typing.Callable[[], None],
icon_name: str,
name: str,
shortcut: typing.Optional[str] = None):
action = QAction(get_icon(icon_name), name, self)
# noinspection PyUnresolvedReferences
action.triggered.connect(callback)
if shortcut:
action.setShortcut(shortcut)
action.setAutoRepeat(False)
try:
action.setShortcutVisibleInContextMenu(True)
except AttributeError:
pass # This feature is not available in PyQt before 5.10
self._tree.addAction(action)
