LVGL 8.2 keyboard

Event callback function processing

static void ta_event_cb(lv_event_t* e)
{
    
    lv_event_code_t code = lv_event_get_code(e); //  Get the event code generated by the object 
    lv_obj_t* ta = lv_event_get_target(e);   //  Get the object that generated the event 
    lv_obj_t* kb = lv_event_get_user_data(e); //  Get the user data associated with the object 
    if (code == LV_EVENT_FOCUSED) {
      //  Focus event processing 
        lv_keyboard_set_textarea(kb, ta); //  The text area is associated with the keyboard 
        lv_obj_clear_flag(kb, LV_OBJ_FLAG_HIDDEN); //  Clear the object hidden flag 
        LV_LOG_USER("%s","LV_EVENT_FOCUSED");
    }
    if (code == LV_EVENT_DEFOCUSED) {
     //  Lose focus event handling 
        lv_keyboard_set_textarea(kb, NULL);    //  Disassociate the text area from the keyboard 
        lv_obj_add_flag(kb, LV_OBJ_FLAG_HIDDEN); //  Add object hidden flag 
         LV_LOG_USER("%s","LV_EVENT_DEFOCUSED");
    }
}

Create text area and keyboard

static void lv_example_keyboard_1(void)
{
    
    /*Create a keyboard to use it with an of the text areas*/
    lv_obj_t* kb = lv_keyboard_create(lv_scr_act());   // Create keyboard objects 
    /*Create a text area. The keyboard will write here*/
    lv_obj_t* ta; 

    ta = lv_textarea_create(lv_scr_act());   //  Create a text input box object 
    lv_obj_align(ta, LV_ALIGN_TOP_LEFT, 10, 10);  // LV_ALIGN_TOP_LEFT Alignment 
    lv_obj_add_event_cb(ta, ta_event_cb, LV_EVENT_ALL, kb); //  Text input box object adds all events 
    lv_textarea_set_placeholder_text(ta, "Hello"); //  Set placeholder character Hello
    lv_obj_set_size(ta, 140, 80);  //  Set size 
    ta = lv_textarea_create(lv_scr_act());   //  Create a text input box object 
    lv_obj_align(ta, LV_ALIGN_TOP_RIGHT, -10, 10); // LV_ALIGN_TOP_RIGHT Alignment 
    lv_obj_add_event_cb(ta, ta_event_cb, LV_EVENT_ALL, kb); //  Text input box object adds all events 
    lv_obj_set_size(ta, 140, 80);  //  Set size 
    lv_keyboard_set_textarea(kb, ta);   //  The text area is associated with the keyboard 
}

Running effect

stay lv_example_keyboard_1 Function to add a key test to lose focus

static void lv_example_keyboard_1(void)
{
    
    /*Create a keyboard to use it with an of the text areas*/
    lv_obj_t* kb = lv_keyboard_create(lv_scr_act());
    /*Create a text area. The keyboard will write here*/
    lv_obj_t* ta;

    ta = lv_textarea_create(lv_scr_act());
    lv_obj_align(ta, LV_ALIGN_TOP_LEFT, 10, 10);
    lv_obj_add_event_cb(ta, ta_event_cb, LV_EVENT_ALL, kb);
    lv_textarea_set_placeholder_text(ta, "Hello");
    lv_obj_set_size(ta, 140, 80);
    ta = lv_textarea_create(lv_scr_act());
    lv_obj_align(ta, LV_ALIGN_TOP_RIGHT, -10, 10);
    lv_obj_add_event_cb(ta, ta_event_cb, LV_EVENT_ALL, kb);
    lv_obj_set_size(ta, 140, 80);
    lv_keyboard_set_textarea(kb, ta);
//  The following is a new addition 
   lv_obj_add_flag(kb, LV_OBJ_FLAG_HIDDEN);  //  Add keyboard hidden flag 

    lv_obj_t* btn = lv_btn_create(lv_scr_act());  //  Create keys 
    lv_obj_align(btn, LV_ALIGN_TOP_MID, 0, 10); //LV_ALIGN_TOP_MID Alignment 
    lv_obj_t* label = lv_label_create(btn); //  establish Label object 
   
    lv_label_set_text(label, "Press me");  //  Set up Label Text content 
    
    
}

Running effect