1def slider_event_cb(e):
2    code = e.get_code()
3    obj = e.get_target()
4
5    # Provide some extra space for the value
6    if code == lv.EVENT.REFR_EXT_DRAW_SIZE:
7        e.set_ext_draw_size(50)
8
9    elif code == lv.EVENT.DRAW_PART_END:
10        # print("DRAW_PART_END")
11        dsc = lv.obj_draw_part_dsc_t.__cast__(e.get_param())
12        # print(dsc)
13        if dsc.part == lv.PART.INDICATOR:
14            label_text = "{:d} - {:d}".format(obj.get_left_value(),slider.get_value())
15            label_size = lv.point_t()
16            lv.txt_get_size(label_size, label_text, lv.font_default(), 0, 0, lv.COORD.MAX, 0)
17            # print(label_size.x,label_size.y)
18            label_area = lv.area_t()
19            label_area.x1 = dsc.draw_area.x1 + dsc.draw_area.get_width() // 2 - label_size.x // 2
20            label_area.x2 = label_area.x1 + label_size.x
21            label_area.y2 = dsc.draw_area.y1 - 10
22            label_area.y1 = label_area.y2 - label_size.y
23
24            label_draw_dsc = lv.draw_label_dsc_t()
25            label_draw_dsc.init()
26
27            dsc.draw_ctx.label(label_draw_dsc, label_area, label_text, None)
28#
29# Show the current value when the slider if pressed by extending the drawer
30#
31#
32#Create a slider in the center of the display
33
34slider = lv.slider(lv.scr_act())
35slider.center()
36
37slider.set_mode(lv.slider.MODE.RANGE)
38slider.set_value(70, lv.ANIM.OFF)
39slider.set_left_value(20, lv.ANIM.OFF)
40
41slider.add_event_cb(slider_event_cb, lv.EVENT.ALL, None)
42slider.refresh_ext_draw_size()
43
44