How to use the ursina.prefabs.draggable.Draggable._z_plane function in ursina

def stop_dragging(self):
        self.dragging = False
        self.delta_drag = self.world_position - self.start_pos
        Draggable._z_plane.enabled = False
        self.collision = True
        mouse.traverse_target = scene

        if hasattr(self, 'drop'):
            self.drop()

def start_dragging(self):
        Draggable._z_plane.world_position = mouse.world_point
        Draggable._z_plane.look_at(Draggable._z_plane.position - Vec3(*self.plane_direction))
        if self.has_ancestor(camera.ui):
            Draggable._z_plane.world_parent = camera.ui
        else:
            Draggable._z_plane.world_parent = scene

        self.start_offset = mouse.world_point - self.world_position
        self.dragging = True
        self.start_pos = self.world_position
        self.collision = False
        Draggable._z_plane.enabled = True
        mouse.traverse_target = Draggable._z_plane
        try:
            self.drag()
        except:
            pass

self.require_key = None
        self.dragging = False
        self.delta_drag = 0
        self.start_pos = self.world_position
        self.start_offset = (0,0,0)
        self.step = (0,0,0)
        self.plane_direction = (0,0,1)
        self.lock_x = False
        self.lock_y = False
        self.lock_z = False
        self.min_x, self.min_y, self.min_z = -math.inf, -math.inf, -math.inf
        self.max_x, self.max_y, self.max_z = math.inf, math.inf, math.inf

        if not Draggable._z_plane.model: # set these after game start so it can load the model
            Draggable._z_plane.model = 'quad'
            Draggable._z_plane.collider = 'box'
            Draggable._z_plane.color = color.clear


        for key, value in kwargs.items():
            if key == 'collider' and value == 'sphere' and self.has_ancestor(camera.ui):
                print('error: sphere colliders are not supported on Draggables in ui space.')

            if key == 'text' or key in self.attributes:
                continue

            setattr(self, key, value)

self.dragging = False
        self.delta_drag = 0
        self.start_pos = self.world_position
        self.start_offset = (0,0,0)
        self.step = (0,0,0)
        self.plane_direction = (0,0,1)
        self.lock_x = False
        self.lock_y = False
        self.lock_z = False
        self.min_x, self.min_y, self.min_z = -math.inf, -math.inf, -math.inf
        self.max_x, self.max_y, self.max_z = math.inf, math.inf, math.inf

        if not Draggable._z_plane.model: # set these after game start so it can load the model
            Draggable._z_plane.model = 'quad'
            Draggable._z_plane.collider = 'box'
            Draggable._z_plane.color = color.clear


        for key, value in kwargs.items():
            if key == 'collider' and value == 'sphere' and self.has_ancestor(camera.ui):
                print('error: sphere colliders are not supported on Draggables in ui space.')

            if key == 'text' or key in self.attributes:
                continue

            setattr(self, key, value)

def start_dragging(self):
        Draggable._z_plane.world_position = mouse.world_point
        Draggable._z_plane.look_at(Draggable._z_plane.position - Vec3(*self.plane_direction))
        if self.has_ancestor(camera.ui):
            Draggable._z_plane.world_parent = camera.ui
        else:
            Draggable._z_plane.world_parent = scene

        self.start_offset = mouse.world_point - self.world_position
        self.dragging = True
        self.start_pos = self.world_position
        self.collision = False
        Draggable._z_plane.enabled = True
        mouse.traverse_target = Draggable._z_plane
        try:
            self.drag()
        except:
            pass

def start_dragging(self):
        Draggable._z_plane.world_position = mouse.world_point
        Draggable._z_plane.look_at(Draggable._z_plane.position - Vec3(*self.plane_direction))
        if self.has_ancestor(camera.ui):
            Draggable._z_plane.world_parent = camera.ui
        else:
            Draggable._z_plane.world_parent = scene

        self.start_offset = mouse.world_point - self.world_position
        self.dragging = True
        self.start_pos = self.world_position
        self.collision = False
        Draggable._z_plane.enabled = True
        mouse.traverse_target = Draggable._z_plane
        try:
            self.drag()
        except:
            pass

def start_dragging(self):
        Draggable._z_plane.world_position = mouse.world_point
        Draggable._z_plane.look_at(Draggable._z_plane.position - Vec3(*self.plane_direction))
        if self.has_ancestor(camera.ui):
            Draggable._z_plane.world_parent = camera.ui
        else:
            Draggable._z_plane.world_parent = scene

        self.start_offset = mouse.world_point - self.world_position
        self.dragging = True
        self.start_pos = self.world_position
        self.collision = False
        Draggable._z_plane.enabled = True
        mouse.traverse_target = Draggable._z_plane
        try:
            self.drag()
        except:
            pass

def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.require_key = None
        self.dragging = False
        self.delta_drag = 0
        self.start_pos = self.world_position
        self.start_offset = (0,0,0)
        self.step = (0,0,0)
        self.plane_direction = (0,0,1)
        self.lock_x = False
        self.lock_y = False
        self.lock_z = False
        self.min_x, self.min_y, self.min_z = -math.inf, -math.inf, -math.inf
        self.max_x, self.max_y, self.max_z = math.inf, math.inf, math.inf

        if not Draggable._z_plane.model: # set these after game start so it can load the model
            Draggable._z_plane.model = 'quad'
            Draggable._z_plane.collider = 'box'
            Draggable._z_plane.color = color.clear


        for key, value in kwargs.items():
            if key == 'collider' and value == 'sphere' and self.has_ancestor(camera.ui):
                print('error: sphere colliders are not supported on Draggables in ui space.')

            if key == 'text' or key in self.attributes:
                continue

            setattr(self, key, value)