1 #include "../../lv_examples.h"
2 #if LV_USE_ROLLER && LV_DRAW_COMPLEX && LV_BUILD_EXAMPLES
3
mask_event_cb(lv_event_t * e)4 static void mask_event_cb(lv_event_t * e)
5 {
6 lv_event_code_t code = lv_event_get_code(e);
7 lv_obj_t * obj = lv_event_get_target(e);
8
9 static int16_t mask_top_id = -1;
10 static int16_t mask_bottom_id = -1;
11
12 if(code == LV_EVENT_COVER_CHECK) {
13 lv_event_set_cover_res(e, LV_COVER_RES_MASKED);
14
15 }
16 else if(code == LV_EVENT_DRAW_MAIN_BEGIN) {
17 /* add mask */
18 const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
19 lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
20 lv_coord_t font_h = lv_font_get_line_height(font);
21
22 lv_area_t roller_coords;
23 lv_obj_get_coords(obj, &roller_coords);
24
25 lv_area_t rect_area;
26 rect_area.x1 = roller_coords.x1;
27 rect_area.x2 = roller_coords.x2;
28 rect_area.y1 = roller_coords.y1;
29 rect_area.y2 = roller_coords.y1 + (lv_obj_get_height(obj) - font_h - line_space) / 2;
30
31 lv_draw_mask_fade_param_t * fade_mask_top = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
32 lv_draw_mask_fade_init(fade_mask_top, &rect_area, LV_OPA_TRANSP, rect_area.y1, LV_OPA_COVER, rect_area.y2);
33 mask_top_id = lv_draw_mask_add(fade_mask_top, NULL);
34
35 rect_area.y1 = rect_area.y2 + font_h + line_space - 1;
36 rect_area.y2 = roller_coords.y2;
37
38 lv_draw_mask_fade_param_t * fade_mask_bottom = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
39 lv_draw_mask_fade_init(fade_mask_bottom, &rect_area, LV_OPA_COVER, rect_area.y1, LV_OPA_TRANSP, rect_area.y2);
40 mask_bottom_id = lv_draw_mask_add(fade_mask_bottom, NULL);
41
42 }
43 else if(code == LV_EVENT_DRAW_POST_END) {
44 lv_draw_mask_fade_param_t * fade_mask_top = lv_draw_mask_remove_id(mask_top_id);
45 lv_draw_mask_fade_param_t * fade_mask_bottom = lv_draw_mask_remove_id(mask_bottom_id);
46 lv_draw_mask_free_param(fade_mask_top);
47 lv_draw_mask_free_param(fade_mask_bottom);
48 lv_mem_buf_release(fade_mask_top);
49 lv_mem_buf_release(fade_mask_bottom);
50 mask_top_id = -1;
51 mask_bottom_id = -1;
52 }
53 }
54
55 /**
56 * Add a fade mask to roller.
57 */
lv_example_roller_3(void)58 void lv_example_roller_3(void)
59 {
60 static lv_style_t style;
61 lv_style_init(&style);
62 lv_style_set_bg_color(&style, lv_color_black());
63 lv_style_set_text_color(&style, lv_color_white());
64 lv_style_set_border_width(&style, 0);
65 lv_style_set_pad_all(&style, 0);
66 lv_obj_add_style(lv_scr_act(), &style, 0);
67
68 lv_obj_t * roller1 = lv_roller_create(lv_scr_act());
69 lv_obj_add_style(roller1, &style, 0);
70 lv_obj_set_style_bg_opa(roller1, LV_OPA_TRANSP, LV_PART_SELECTED);
71
72 #if LV_FONT_MONTSERRAT_22
73 lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
74 #endif
75
76 lv_roller_set_options(roller1,
77 "January\n"
78 "February\n"
79 "March\n"
80 "April\n"
81 "May\n"
82 "June\n"
83 "July\n"
84 "August\n"
85 "September\n"
86 "October\n"
87 "November\n"
88 "December",
89 LV_ROLLER_MODE_NORMAL);
90
91 lv_obj_center(roller1);
92 lv_roller_set_visible_row_count(roller1, 3);
93 lv_obj_add_event_cb(roller1, mask_event_cb, LV_EVENT_ALL, NULL);
94 }
95
96 #endif
97
