1 #include "../../lv_examples.h"
2 #if LV_USE_BAR && LV_BUILD_EXAMPLES
3
4 #define MAX_VALUE 100
5 #define MIN_VALUE 0
6
set_value(void * bar,int32_t v)7 static void set_value(void * bar, int32_t v)
8 {
9 lv_bar_set_value(bar, v, LV_ANIM_OFF);
10 }
11
event_cb(lv_event_t * e)12 static void event_cb(lv_event_t * e)
13 {
14 lv_obj_t * obj = lv_event_get_target(e);
15
16 lv_draw_label_dsc_t label_dsc;
17 lv_draw_label_dsc_init(&label_dsc);
18 label_dsc.font = LV_FONT_DEFAULT;
19
20 char buf[8];
21 lv_snprintf(buf, sizeof(buf), "%d", (int)lv_bar_get_value(obj));
22
23 lv_point_t txt_size;
24 lv_text_get_size(&txt_size, buf, label_dsc.font, label_dsc.letter_space, label_dsc.line_space, LV_COORD_MAX,
25 label_dsc.flag);
26
27 lv_area_t txt_area;
28 txt_area.x1 = 0;
29 txt_area.x2 = txt_size.x - 1;
30 txt_area.y1 = 0;
31 txt_area.y2 = txt_size.y - 1;
32
33 lv_area_t indic_area;
34 lv_obj_get_coords(obj, &indic_area);
35 lv_area_set_width(&indic_area, lv_area_get_width(&indic_area) * lv_bar_get_value(obj) / MAX_VALUE);
36
37 /*If the indicator is long enough put the text inside on the right*/
38 if(lv_area_get_width(&indic_area) > txt_size.x + 20) {
39 lv_area_align(&indic_area, &txt_area, LV_ALIGN_RIGHT_MID, -10, 0);
40 label_dsc.color = lv_color_white();
41 }
42 /*If the indicator is still short put the text out of it on the right*/
43 else {
44 lv_area_align(&indic_area, &txt_area, LV_ALIGN_OUT_RIGHT_MID, 10, 0);
45 label_dsc.color = lv_color_black();
46 }
47 label_dsc.text = buf;
48 label_dsc.text_local = true;
49 lv_layer_t * layer = lv_event_get_layer(e);
50 lv_draw_label(layer, &label_dsc, &txt_area);
51 }
52
53 /**
54 * Custom drawer on the bar to display the current value
55 */
lv_example_bar_6(void)56 void lv_example_bar_6(void)
57 {
58 lv_obj_t * bar = lv_bar_create(lv_screen_active());
59 lv_bar_set_range(bar, MIN_VALUE, MAX_VALUE);
60 lv_obj_set_size(bar, 200, 20);
61 lv_obj_center(bar);
62 lv_obj_add_event_cb(bar, event_cb, LV_EVENT_DRAW_MAIN_END, NULL);
63
64 lv_anim_t a;
65 lv_anim_init(&a);
66 lv_anim_set_var(&a, bar);
67 lv_anim_set_values(&a, 0, 100);
68 lv_anim_set_exec_cb(&a, set_value);
69 lv_anim_set_duration(&a, 4000);
70 lv_anim_set_reverse_duration(&a, 4000);
71 lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
72 lv_anim_start(&a);
73
74 }
75
76 #endif
77
