UIElement.cs

//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: UIElement that responds to VR hands and generates UnityEvents
//
//=============================================================================

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
using System;

namespace Valve.VR.InteractionSystem
{
    //-------------------------------------------------------------------------
    [RequireComponent( typeof( Interactable ) )]
    public class UIElement : MonoBehaviour
    {
        public CustomEvents.UnityEventHand onHandClick;

        private Hand currentHand;

        //-------------------------------------------------
        void Awake()
        {
            Button button = GetComponent<Button>();
            if ( button )
            {
                button.onClick.AddListener( OnButtonClick );
            }
        }


        //-------------------------------------------------
        private void OnHandHoverBegin( Hand hand )
        {
            currentHand = hand;
            InputModule.instance.HoverBegin( gameObject );
            ControllerButtonHints.ShowButtonHint( hand, Valve.VR.EVRButtonId.k_EButton_SteamVR_Trigger );
        }


        //-------------------------------------------------
        private void OnHandHoverEnd( Hand hand )
        {
            InputModule.instance.HoverEnd( gameObject );
            ControllerButtonHints.HideButtonHint( hand, Valve.VR.EVRButtonId.k_EButton_SteamVR_Trigger );
            currentHand = null;
        }


        //-------------------------------------------------
        private void HandHoverUpdate( Hand hand )
        {
            if ( hand.GetStandardInteractionButtonDown() )
            {
                InputModule.instance.Submit( gameObject );
                ControllerButtonHints.HideButtonHint( hand, Valve.VR.EVRButtonId.k_EButton_SteamVR_Trigger );
            }
        }


        //-------------------------------------------------
        private void OnButtonClick()
        {
            onHandClick.Invoke( currentHand );
        }
    }

#if UNITY_EDITOR
    //-------------------------------------------------------------------------
    [UnityEditor.CustomEditor( typeof( UIElement ) )]
    public class UIElementEditor : UnityEditor.Editor
    {
        //-------------------------------------------------
        // Custom Inspector GUI allows us to click from within the UI
        //-------------------------------------------------
        public override void OnInspectorGUI()
        {
            DrawDefaultInspector();

            UIElement uiElement = (UIElement)target;
            if ( GUILayout.Button( "Click" ) )
            {
                InputModule.instance.Submit( uiElement.gameObject );
            }
        }
    }
#endif
}