// ***********************************************************************
// Assembly         : Unity
// Author           : Kimch
// Created          : 2018-03-29
//
// Last Modified By : 
// Last Modified On : 
// ***********************************************************************
// <copyright file= "KUIToggle" company="Kunpo"></copyright>
// <summary></summary>
// ***********************************************************************
using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Toggle))]
public class KUIToggle : MonoBehaviour
{
	public Graphic onGraphic;
	public Graphic offGrphic;

	private Toggle.ToggleTransition _toggleTransition;

	private void OnToggleValueChanged(bool value)
	{
		PlayEffect(onGraphic, value, _toggleTransition == Toggle.ToggleTransition.None);
		PlayEffect(offGrphic, !value, _toggleTransition == Toggle.ToggleTransition.None);
	}

	/// <summary>
	/// Play the appropriate effect.
	/// </summary>
	private void PlayEffect(Graphic graphic, bool isOn, bool instant)
	{
		if (graphic == null)
			return;

#if UNITY_EDITOR
		if (!Application.isPlaying)
			graphic.canvasRenderer.SetAlpha(isOn ? 1f : 0f);
		else
#endif
			graphic.CrossFadeAlpha(isOn ? 1f : 0f, instant ? 0f : 0.1f, true);
	}

	#region Unity

	private void Start()
	{
		var toggle = GetComponent<Toggle>();
		toggle.onValueChanged.AddListener(OnToggleValueChanged);
		_toggleTransition = toggle.toggleTransition;
		OnToggleValueChanged(toggle.isOn);
	}

	#endregion
}