Events during a drag:
self._draggable is always true but can be set to False by a user's direct action.
self.am_touched set True if touch lingers or it's a double tap
self.remove_on_drag set by user
set in set_drag_start_state (called from on_drag_start):
self._move_counter set to 0
self._old_opacity set to self.opacity
self.opacity set to self.drag_opacity
self._old_drag_pos set to self.pos
self._old_parent set to self.parent
self._old_parent_children_reversed_list set to self.parent.children[:].reverse()
DragNDropWidget.widget_entered set to None
self._old_index set to -1 if a copy, otherwise set to self.parent.children.index(self)
self._dragged set to True
``
on_touch_down- If collide_point and self._draggable - If touch lingers for > 0.2s, or touch.is_double_tap: - self.am_touched = True
on_touch_move- - If the widget.am_touched: - If not widget._dragged: widget.dispatch("on_drag_start") - If not widget._drag_started, return - widget._move_counter++ - widget._draggable && widget._drag_started: - widget._dragged = True - Move the widget - If it collides and is in the drop_group, Call the drag_destination.while_dragging_func