#include "../lv_examples.h" #if LV_BUILD_EXAMPLES && LV_USE_BTN static void btn_event_cb(lv_event_t * e) { lv_event_code_t code = lv_event_get_code(e); lv_obj_t * btn = lv_event_get_target(e); if(code == LV_EVENT_CLICKED) { static uint8_t cnt = 0; cnt++; /*Get the first child of the button which is the label and change its text*/ lv_obj_t * label = lv_obj_get_child(btn, 0); lv_label_set_text_fmt(label, "Button: %d", cnt); } } /** * Create a button with a label and react on click event. */ void lv_example_get_started_1(void) { lv_obj_t * btn = lv_btn_create(lv_scr_act()); /*Add a button the current screen*/ lv_obj_set_pos(btn, 10, 10); /*Set its position*/ lv_obj_set_size(btn, 120, 50); /*Set its size*/ lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_ALL, NULL); /*Assign a callback to the button*/ lv_obj_t * label = lv_label_create(btn); /*Add a label to the button*/ lv_label_set_text(label, "Button"); /*Set the labels text*/ lv_obj_center(label); } #endif