1 #include "../../lv_examples.h"
2 #if LV_USE_SLIDER && LV_BUILD_EXAMPLES
3
4 #define MAX_VALUE 100
5 #define MIN_VALUE 0
6
7 static void slider_event_cb(lv_event_t * e);
8
9 /**
10 * Show the current value when the slider is pressed by extending the drawer
11 *
12 */
lv_example_slider_3(void)13 void lv_example_slider_3(void)
14 {
15 /*Create a slider in the center of the display*/
16 lv_obj_t * slider;
17 slider = lv_slider_create(lv_screen_active());
18 lv_obj_center(slider);
19
20 lv_slider_set_mode(slider, LV_SLIDER_MODE_RANGE);
21 lv_slider_set_range(slider, MIN_VALUE, MAX_VALUE);
22 lv_slider_set_value(slider, 70, LV_ANIM_OFF);
23 lv_slider_set_left_value(slider, 20, LV_ANIM_OFF);
24
25 lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_ALL, NULL);
26 lv_obj_refresh_ext_draw_size(slider);
27 }
28
slider_event_cb(lv_event_t * e)29 static void slider_event_cb(lv_event_t * e)
30 {
31 lv_event_code_t code = lv_event_get_code(e);
32 lv_obj_t * obj = lv_event_get_target(e);
33
34 /*Provide some extra space for the value*/
35 if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
36 lv_event_set_ext_draw_size(e, 50);
37 }
38 else if(code == LV_EVENT_DRAW_MAIN_END) {
39 if(!lv_obj_has_state(obj, LV_STATE_PRESSED)) return;
40
41 lv_area_t slider_area;
42 lv_obj_get_coords(obj, &slider_area);
43 lv_area_t indic_area = slider_area;
44 lv_area_set_width(&indic_area, lv_area_get_width(&slider_area) * lv_slider_get_value(obj) / MAX_VALUE);
45 indic_area.x1 += lv_area_get_width(&slider_area) * lv_slider_get_left_value(obj) / MAX_VALUE;
46 char buf[16];
47 lv_snprintf(buf, sizeof(buf), "%d - %d", (int)lv_slider_get_left_value(obj), (int)lv_slider_get_value(obj));
48
49 lv_point_t label_size;
50 lv_text_get_size(&label_size, buf, LV_FONT_DEFAULT, 0, 0, LV_COORD_MAX, 0);
51 lv_area_t label_area;
52 label_area.x1 = 0;
53 label_area.x2 = label_size.x - 1;
54 label_area.y1 = 0;
55 label_area.y2 = label_size.y - 1;
56
57 lv_area_align(&indic_area, &label_area, LV_ALIGN_OUT_TOP_MID, 0, -10);
58
59 lv_draw_label_dsc_t label_draw_dsc;
60 lv_draw_label_dsc_init(&label_draw_dsc);
61 label_draw_dsc.color = lv_color_hex3(0x888);
62 label_draw_dsc.text = buf;
63 label_draw_dsc.text_local = true;
64 lv_layer_t * layer = lv_event_get_layer(e);
65 lv_draw_label(layer, &label_draw_dsc, &label_area);
66 }
67 }
68
69 #endif
70
