How to move between objects using a keyboard/encoder

How-to
1

Description

I have a small project with a few pages, I want to move between pages using a/an keyboard/encoder

What MCU/Processor/Board and compiler are you using?

visual studio

What LVGL version are you using?

7.11

What do you want to achieve?

Move between objects/buttons using a keyboard and typing to text areas

What have you tried so far?

This post Input device interface

Code to reproduce

static void home_open(uint32_t delay) {

lv_group_t* g = lv_group_create();
lv_obj_t * icon;

lv_obj_t * box = lv_obj_create(lv_scr_act(), NULL);
    lv_obj_set_size(box, box_w, 260);
    lv_obj_align(box, NULL, LV_ALIGN_IN_TOP_MID, 0, 100);
    delay += LV_DEMO_PRINTER_ANIM_DELAY;
    lv_demo_printer_anim_in(box, delay);
    lv_group_add_obj(g, box);
LV_IMG_DECLARE(lv_demo_printer_img_copy);
    LV_IMG_DECLARE(lv_demo_printer_img_scan);
    LV_IMG_DECLARE(lv_demo_printer_img_print);
    LV_IMG_DECLARE(lv_demo_printer_img_setup);

    icon = add_icon(box, &lv_demo_printer_img_btn_bg_3, &lv_demo_printer_img_copy, "Page1");
    lv_obj_align_origo(icon, NULL, LV_ALIGN_IN_LEFT_MID, 1 * (box_w - 20) / 8 + 10, 0);
    lv_obj_set_event_cb(icon, copy_open_icon_event_cb);
    lv_obj_fade_in(icon, LV_DEMO_PRINTER_ANIM_TIME * 2, delay + LV_DEMO_PRINTER_ANIM_TIME + 50);
    lv_group_add_obj(g, icon);

    icon = add_icon(box, &lv_demo_printer_img_btn_bg_3, &lv_demo_printer_icon_tel, "Page2");
    lv_obj_align_origo(icon, NULL, LV_ALIGN_IN_LEFT_MID, 4 * (box_w - 20) / 8 + 10, 0);
    lv_obj_fade_in(icon, LV_DEMO_PRINTER_ANIM_TIME * 2, delay + LV_DEMO_PRINTER_ANIM_TIME + 50);
    lv_obj_set_event_cb(icon, print_open_event_cb);
    lv_group_add_obj(g, icon);

    icon = add_icon(box, &lv_demo_printer_img_btn_bg_3, &lv_demo_printer_img_setup, "Page3");
    lv_obj_align_origo(icon, NULL, LV_ALIGN_IN_LEFT_MID, 7 * (box_w - 20) / 8 + 10, 0);
    lv_obj_fade_in(icon, LV_DEMO_PRINTER_ANIM_TIME * 2, delay + LV_DEMO_PRINTER_ANIM_TIME + 50);
    lv_obj_set_event_cb(icon, print_open_event_cb);
    lv_group_add_obj(g, icon);

    lv_indev_drv_t real_kb_drv;
    lv_indev_drv_init(&real_kb_drv);
    real_kb_drv.type = LV_INDEV_TYPE_KEYPAD;
    real_kb_drv.read_cb = keyboard_read;
    lv_indev_t* real_kb_indev = lv_indev_drv_register(&real_kb_drv);
    lv_indev_set_group(real_kb_indev, g);
}

bool keyboard_read(lv_indev_drv_t* drv, lv_indev_data_t* data) {


    data->key = last_key();            /*Get the last pressed or released key*/
    if (key_pressed()) data->state = LV_INDEV_STATE_PR;
    else data->state = LV_INDEV_STATE_REL;

    return false; /*No buffering now so no more data read*/
}

until now I’m getting an error when running this code in keyboard_read

Screenshot and/or video

image