1 #include "../lv_examples.h"
2
3 #if LV_BUILD_EXAMPLES
4
5 static int n = 3;
6 static lv_obj_t * label = NULL;
7
timer_cb(lv_timer_t * timer)8 static void timer_cb(lv_timer_t * timer)
9 {
10 if(n < 3 || n > 32) {
11 n = 3;
12 }
13 else {
14 static uint32_t old_tick = 0;
15 uint32_t tick = lv_tick_get();
16 if(!old_tick) {
17 old_tick = tick;
18 }
19 if(tick - old_tick > 3000) {
20 n++;
21 lv_label_set_text_fmt(label, "%d sides", n);
22 old_tick = tick;
23 }
24 }
25 lv_obj_invalidate(timer->user_data);
26 }
27
event_cb(lv_event_t * e)28 static void event_cb(lv_event_t * e)
29 {
30 /*The original target of the event. Can be the buttons or the container*/
31 lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
32 lv_draw_rect_dsc_t draw_dsc;
33 lv_draw_rect_dsc_init(&draw_dsc);
34 draw_dsc.bg_color = lv_palette_main(LV_PALETTE_LIGHT_GREEN);
35 draw_dsc.bg_opa = LV_OPA_COVER;
36 lv_point_t points[32];
37 int i, r = 150;
38 uint32_t tick = lv_tick_get();
39 for(i = 0; i < n; i++) {
40 int angle = i * 360 / n + ((tick % 36000) / 100);
41 lv_coord_t x = 150 + (r * lv_trigo_cos(angle) >> LV_TRIGO_SHIFT), y =
42 150 + (r * lv_trigo_sin(angle) >> LV_TRIGO_SHIFT);
43 points[i].x = x;
44 points[i].y = y;
45 }
46 lv_draw_polygon(draw_ctx, &draw_dsc, points, n);
47 }
48
49 /**
50 * Demonstrate event bubbling
51 */
lv_example_event_4(void)52 void lv_example_event_4(void)
53 {
54
55 lv_obj_t * cont = lv_obj_create(lv_scr_act());
56 lv_obj_remove_style_all(cont);
57 lv_obj_set_size(cont, 300, 300);
58 label = lv_label_create(cont);
59 lv_label_set_text_fmt(label, "%d sides", n);
60 lv_obj_center(label);
61
62 lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_MAIN, NULL);
63 lv_timer_create(timer_cb, 17, cont);
64 }
65
66 #endif
67
