/*******************************************************************************
* Example 4: Switch Widget (ON/OFF Toggle)
*
* Official Reference: https://docs.lvgl.io/9.2/widgets/switch.html
* Example Code: https://github.com/lvgl/lvgl/blob/release/v9.2/examples/widgets/switch/lv_example_switch_1.c
******************************************************************************/
/* Global variables */
static lv_obj_t * status_label;
static lv_obj_t * led;
/* Switch callback */
static void switch_cb(lv_event_t * e)
{
lv_obj_t * sw = lv_event_get_target(e);
bool is_checked = lv_obj_has_state(sw, LV_STATE_CHECKED);
if(is_checked) {
lv_label_set_text(status_label, "GPIO State: HIGH (ON)");
lv_led_on(led);
printf("Switch ON - GPIO would be HIGH\r\n");
} else {
lv_label_set_text(status_label, "GPIO State: LOW (OFF)");
lv_led_off(led);
printf("Switch OFF - GPIO would be LOW\r\n");
}
}
void week3_ex4_switch_toggle(void)
{
/* Background */
lv_obj_set_style_bg_color(lv_screen_active(),
lv_color_hex(0x16213e),
LV_PART_MAIN);
/* Title */
lv_obj_t * title = lv_label_create(lv_screen_active());
lv_label_set_text(title, "Week 3 - Example 4: Switch Control");
lv_obj_set_style_text_color(title, lv_color_hex(0xFFFFFF), 0);
lv_obj_align(title, LV_ALIGN_TOP_MID, 0, 20);
/* LED indicator */
led = lv_led_create(lv_screen_active());
lv_obj_set_size(led, 60, 60);
lv_obj_align(led, LV_ALIGN_CENTER, 0, -60);
lv_led_set_color(led, lv_palette_main(LV_PALETTE_YELLOW));
lv_led_off(led); /* Initial state: OFF */
/* Label for LED */
lv_obj_t * led_label = lv_label_create(lv_screen_active());
lv_label_set_text(led_label, "Virtual LED");
lv_obj_set_style_text_color(led_label, lv_color_hex(0xFFFFFF), 0);
lv_obj_align_to(led_label, led, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
/* Switch */
lv_obj_t * sw = lv_switch_create(lv_screen_active());
lv_obj_set_size(sw, 80, 40);
lv_obj_align(sw, LV_ALIGN_CENTER, 0, 40);
lv_obj_add_event_cb(sw, switch_cb, LV_EVENT_VALUE_CHANGED, NULL);
/* Status label */
status_label = lv_label_create(lv_screen_active());
lv_label_set_text(status_label, "GPIO State: LOW (OFF)");
lv_obj_set_style_text_color(status_label, lv_color_hex(0x00FF00), 0);
lv_obj_align(status_label, LV_ALIGN_CENTER, 0, 100);
/* Description */
lv_obj_t * desc = lv_label_create(lv_screen_active());
lv_label_set_text(desc, "Learning: lv_switch_create, LV_STATE_CHECKED\n"
"This switch would control a real GPIO in actual hardware");
lv_obj_set_style_text_color(desc, lv_color_hex(0xAAAAAA), 0);
lv_obj_set_style_text_align(desc, LV_TEXT_ALIGN_CENTER, 0);
lv_obj_align(desc, LV_ALIGN_BOTTOM_MID, 0, -45);
}
