1import fs_driver
2import sys
3
4class Lv_Roller_3():
5
6    def __init__(self):
7        self.mask_top_id = -1
8        self.mask_bottom_id = -1
9
10        #
11        # Add a fade mask to roller.
12        #
13        style = lv.style_t()
14        style.init()
15        style.set_bg_color(lv.color_black())
16        style.set_text_color(lv.color_white())
17
18        lv.scr_act().add_style(style, 0)
19
20        roller1 = lv.roller(lv.scr_act())
21        roller1.add_style(style, 0)
22        roller1.set_style_border_width(0, 0)
23        roller1.set_style_pad_all(0, 0)
24        roller1.set_style_bg_opa(lv.OPA.TRANSP, lv.PART.SELECTED)
25
26        #if LV_FONT_MONTSERRAT_22
27        #    lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
28        #endif
29        try:
30            roller1.set_style_text_font(lv.font_montserrat_22,lv.PART.SELECTED)
31        except:
32            fs_drv = lv.fs_drv_t()
33            fs_driver.fs_register(fs_drv, 'S')
34            print("montserrat-22 not enabled in lv_conf.h, dynamically loading the font")
35            font_montserrat_22 = lv.font_load("S:" + "../../assets/font/montserrat-22.fnt")
36            roller1.set_style_text_font(font_montserrat_22,lv.PART.SELECTED)
37
38        roller1.set_options("\n".join([
39            "January",
40            "February",
41            "March",
42            "April",
43            "May",
44            "June",
45            "July",
46            "August",
47            "September",
48            "October",
49            "November",
50            "December"]),lv.roller.MODE.NORMAL)
51
52        roller1.center()
53        roller1.set_visible_row_count(3)
54        roller1.add_event_cb(self.mask_event_cb, lv.EVENT.ALL, None)
55
56    def mask_event_cb(self,e):
57
58        code = e.get_code()
59        obj = e.get_target()
60
61        if code == lv.EVENT.COVER_CHECK:
62            e.set_cover_res(lv.COVER_RES.MASKED)
63
64        elif code == lv.EVENT.DRAW_MAIN_BEGIN:
65            # add mask
66            font = obj.get_style_text_font(lv.PART.MAIN)
67            line_space = obj.get_style_text_line_space(lv.PART.MAIN)
68            font_h = font.get_line_height()
69
70            roller_coords = lv.area_t()
71            obj.get_coords(roller_coords)
72
73            rect_area = lv.area_t()
74            rect_area.x1 = roller_coords.x1
75            rect_area.x2 = roller_coords.x2
76            rect_area.y1 = roller_coords.y1
77            rect_area.y2 = roller_coords.y1 + (obj.get_height() - font_h - line_space) // 2
78
79            fade_mask_top = lv.draw_mask_fade_param_t()
80            fade_mask_top.init(rect_area, lv.OPA.TRANSP, rect_area.y1, lv.OPA.COVER, rect_area.y2)
81            self.mask_top_id = lv.draw_mask_add(fade_mask_top,None)
82
83            rect_area.y1 = rect_area.y2 + font_h + line_space - 1
84            rect_area.y2 = roller_coords.y2
85
86            fade_mask_bottom = lv.draw_mask_fade_param_t()
87            fade_mask_bottom.init(rect_area, lv.OPA.COVER, rect_area.y1, lv.OPA.TRANSP, rect_area.y2)
88            self.mask_bottom_id = lv.draw_mask_add(fade_mask_bottom, None)
89
90        elif code == lv.EVENT.DRAW_POST_END:
91            fade_mask_top = lv.draw_mask_remove_id(self.mask_top_id)
92            fade_mask_bottom = lv.draw_mask_remove_id(self.mask_bottom_id)
93            # Remove the masks
94            lv.draw_mask_remove_id(self.mask_top_id)
95            lv.draw_mask_remove_id(self.mask_bottom_id)
96            self.mask_top_id = -1
97            self.mask_bottom_id = -1
98
99roller3 = Lv_Roller_3()
100