lib/lvgl/examples/others/observer/lv_example_observer_1.c


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#include "../../lv_examples.h"
#if LV_USE_OBSERVER && LV_USE_SLIDER && LV_USE_LABEL && LV_BUILD_EXAMPLES

static lv_subject_t temperature_subject;

/**
 * A slider sends a message on value change and a label display's that value
 */
void lv_example_observer_1(void)
{
    lv_subject_init_int(&temperature_subject, 28);

    /*Create a slider in the center of the display*/
    lv_obj_t * slider = lv_slider_create(lv_screen_active());
    lv_obj_center(slider);
    lv_slider_bind_value(slider, &temperature_subject);

    /*Create a label below the slider*/
    lv_obj_t * label = lv_label_create(lv_screen_active());
    lv_obj_align(label, LV_ALIGN_CENTER, 0, 30);
    lv_label_bind_text(label, &temperature_subject, "%d °C");
}

#endif