acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
lv_example_msg_3.c (4790B)
      1 #include "../../lv_examples.h"
      2 #if LV_USE_MSG && LV_USE_SLIDER && LV_USE_LABEL && LV_BUILD_EXAMPLES
      3 
      4 /*Define a message ID*/
      5 #define MSG_INC             1
      6 #define MSG_DEC             2
      7 #define MSG_SET             3
      8 #define MSG_UPDATE          4
      9 #define MSG_UPDATE_REQUEST  5
     10 
     11 static void value_handler(void * s, lv_msg_t * m);
     12 static void value_handler(void * s, lv_msg_t * m);
     13 static void btn_event_cb(lv_event_t * e);
     14 static void label_event_cb(lv_event_t * e);
     15 static void slider_event_cb(lv_event_t * e);
     16 
     17 /**
     18  * Show how an increment button, a decrement button, as slider can set a value
     19  * and a label display it.
     20  * The current value (i.e. the system's state) is stored only in one static variable in a function
     21  * and no global variables are required.
     22  */
     23 void lv_example_msg_3(void)
     24 {
     25 
     26     lv_msg_subsribe(MSG_INC, value_handler, NULL);
     27     lv_msg_subsribe(MSG_DEC, value_handler, NULL);
     28     lv_msg_subsribe(MSG_SET, value_handler, NULL);
     29     lv_msg_subsribe(MSG_UPDATE, value_handler, NULL);
     30     lv_msg_subsribe(MSG_UPDATE_REQUEST, value_handler, NULL);
     31 
     32     lv_obj_t * panel = lv_obj_create(lv_scr_act());
     33     lv_obj_set_size(panel, 250, LV_SIZE_CONTENT);
     34     lv_obj_center(panel);
     35     lv_obj_set_flex_flow(panel, LV_FLEX_FLOW_ROW);
     36     lv_obj_set_flex_align(panel, LV_FLEX_ALIGN_SPACE_BETWEEN, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START);
     37 
     38     lv_obj_t * btn;
     39     lv_obj_t * label;
     40 
     41     /*Up button*/
     42     btn = lv_btn_create(panel);
     43     lv_obj_set_flex_grow(btn, 1);
     44     lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_ALL, NULL);
     45     label = lv_label_create(btn);
     46     lv_label_set_text(label, LV_SYMBOL_LEFT);
     47     lv_obj_center(label);
     48 
     49     /*Current value*/
     50     label = lv_label_create(panel);
     51     lv_obj_set_flex_grow(label, 2);
     52     lv_obj_set_style_text_align(label, LV_TEXT_ALIGN_CENTER, 0);
     53     lv_label_set_text(label, "?");
     54     lv_msg_subsribe_obj(MSG_UPDATE, label, NULL);
     55     lv_obj_add_event_cb(label, label_event_cb, LV_EVENT_MSG_RECEIVED, NULL);
     56 
     57     /*Down button*/
     58     btn = lv_btn_create(panel);
     59     lv_obj_set_flex_grow(btn, 1);
     60     lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_ALL, NULL);
     61     label = lv_label_create(btn);
     62     lv_label_set_text(label, LV_SYMBOL_RIGHT);
     63     lv_obj_center(label);
     64 
     65     /*Slider*/
     66     lv_obj_t * slider = lv_slider_create(panel);
     67     lv_obj_set_flex_grow(slider, 1);
     68     lv_obj_add_flag(slider, LV_OBJ_FLAG_FLEX_IN_NEW_TRACK);
     69     lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_ALL, NULL);
     70     lv_msg_subsribe_obj(MSG_UPDATE, slider, NULL);
     71 
     72 
     73     /* As there are new UI elements that don't know the system's state
     74      * send an UPDATE REQUEST message which will trigger an UPDATE message with the current value*/
     75     lv_msg_send(MSG_UPDATE_REQUEST, NULL);
     76 }
     77 
     78 
     79 static void value_handler(void * s, lv_msg_t * m)
     80 {
     81     LV_UNUSED(s);
     82 
     83     static int32_t value = 10;
     84     int32_t old_value = value;
     85     switch(lv_msg_get_id(m)) {
     86         case MSG_INC:
     87             if(value < 100) value++;
     88             break;
     89         case MSG_DEC:
     90             if(value > 0) value--;
     91             break;
     92         case MSG_SET: {
     93                 const int32_t * new_value = lv_msg_get_payload(m);
     94                 value = *new_value;
     95             }
     96             break;
     97         case MSG_UPDATE_REQUEST:
     98             lv_msg_send(MSG_UPDATE, &value);
     99             break;
    100         default:
    101             break;
    102     }
    103 
    104     if(value != old_value) {
    105         lv_msg_send(MSG_UPDATE, &value);
    106     }
    107 }
    108 
    109 
    110 static void btn_event_cb(lv_event_t * e)
    111 {
    112     lv_obj_t * btn = lv_event_get_target(e);
    113     lv_event_code_t code = lv_event_get_code(e);
    114     if(code == LV_EVENT_CLICKED || code == LV_EVENT_LONG_PRESSED_REPEAT) {
    115         if(lv_obj_get_index(btn) == 0) {    /*First object is the dec. button*/
    116             lv_msg_send(MSG_DEC, NULL);
    117         }
    118         else {
    119             lv_msg_send(MSG_INC, NULL);
    120         }
    121     }
    122 }
    123 
    124 static void label_event_cb(lv_event_t * e)
    125 {
    126     lv_obj_t * label = lv_event_get_target(e);
    127     lv_event_code_t code = lv_event_get_code(e);
    128     if(code == LV_EVENT_MSG_RECEIVED) {
    129         lv_msg_t * m = lv_event_get_msg(e);
    130         if(lv_msg_get_id(m) == MSG_UPDATE) {
    131             const int32_t * v = lv_msg_get_payload(m);
    132             lv_label_set_text_fmt(label, "%d %%", *v);
    133         }
    134     }
    135 }
    136 
    137 static void slider_event_cb(lv_event_t * e)
    138 {
    139     lv_obj_t * slider = lv_event_get_target(e);
    140     lv_event_code_t code = lv_event_get_code(e);
    141     if(code == LV_EVENT_VALUE_CHANGED) {
    142         int32_t v = lv_slider_get_value(slider);
    143         lv_msg_send(MSG_SET, &v);
    144     }
    145     else if(code == LV_EVENT_MSG_RECEIVED) {
    146         lv_msg_t * m = lv_event_get_msg(e);
    147         if(lv_msg_get_id(m) == MSG_UPDATE) {
    148             const int32_t * v = lv_msg_get_payload(m);
    149             lv_slider_set_value(slider, *v, LV_ANIM_OFF);
    150         }
    151     }
    152 }
    153 
    154 #endif