arfoundation-samples/Assets/Scripts/UX/UIManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.ARFoundation;

public class UIManager : MonoBehaviour
{

	const string k_FadeOffAnim = "FadeOff";
	const string k_FadeOnAnim = "FadeOn";

	[SerializeField] ARPlaneManager m_PlaneManager;
	[SerializeField] Animator m_MoveDeviceAnimation;
	[SerializeField] Animator m_TapToPlaceAnimation;
	
	List<ARPlane> m_Planes = new List<ARPlane>();

	bool m_ShowingTapToPlace = false;
	bool m_ShowingMoveDevice = true;

	void OnEnable()
	{
		ARSubsystemManager.cameraFrameReceived += FrameChanged;
		PlaceMultipleObjectsOnPlane.onPlacedObject += PlacedObject;
	}

	void OnDisable()
	{
		ARSubsystemManager.cameraFrameReceived -= FrameChanged;
		PlaceMultipleObjectsOnPlane.onPlacedObject -= PlacedObject;
	}

	void FrameChanged(ARCameraFrameEventArgs args)
	{
		if (PlanesFound() && m_ShowingMoveDevice)
		{
			m_MoveDeviceAnimation.SetTrigger(k_FadeOffAnim);
			m_TapToPlaceAnimation.SetTrigger(k_FadeOnAnim);
			m_ShowingTapToPlace = true;
			m_ShowingMoveDevice = false;
		}
	}

	bool PlanesFound()
	{
		if (m_PlaneManager)
		{
			m_PlaneManager.GetAllPlanes(m_Planes);
			return m_Planes.Count > 0;
		}
		return false;
	}

	void PlacedObject()
	{
		if (m_ShowingTapToPlace)
		{
			m_TapToPlaceAnimation.SetTrigger(k_FadeOffAnim);
			m_ShowingTapToPlace = false;
		}
	}

}