InputFieldsTabSwitcher.cs

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using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
 
public class InputFieldsTabSwitcher : ManlySingleton<InputFieldsTabSwitcher>
{
    private EventSystem currentEventSystem;
 
    private List<UiInputField> activeInputs = new List<UiInputField>();
 
    private int currentActiveInputIndex = -1;
 
    private void Start()
    {
        currentEventSystem = EventSystem.current;
    }
 
    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Tab))
        {
            TrySelectNextInput();
        }
    }
 
    private void TrySelectNextInput()
    {
        CheckIfAnyInputIsSelected();
        SelectNextInput();
    }
 
    private void CheckIfAnyInputIsSelected()
    {
        GameObject selectedObject = currentEventSystem.currentSelectedGameObject;
        if (selectedObject != null)
        {
            currentActiveInputIndex = activeInputs.FindIndex((UiInputField x) => x.gameObject == selectedObject);
        }
    }
 
    private void SelectNextInput()
    {
        if (currentActiveInputIndex > -1)
        {
            activeInputs[currentActiveInputIndex].DeactivateInputField();
            IterateSelectableIndex();
            currentEventSystem.SetSelectedGameObject(activeInputs[currentActiveInputIndex].gameObject);
            activeInputs[currentActiveInputIndex].ActivateInputField();
        }
    }
 
    private void IterateSelectableIndex()
    {
        currentActiveInputIndex++;
        currentActiveInputIndex %= activeInputs.Count;
    }
 
    public void RegisterInputField(UiInputField input)
    {
        if (!activeInputs.Contains(input))
        {
            activeInputs.Add(input);
        }
    }
 
    public void UnregisterInputField(UiInputField input)
    {
        if (activeInputs.Contains(input))
        {
            activeInputs.Remove(input);
        }
    }
}