import from UniRx and some modified.

Assets/UniRx.Async/Triggers/AsyncTriggerTrigger.cs

@@ -0,0 +1,69 @@
+
+#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+
+using System.Collections.Generic;
+using System.Threading;
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace UniRx.Async.Triggers
+{
+    [DisallowMultipleComponent]
+    public class AsyncTriggerTrigger : AsyncTriggerBase
+    {
+        AsyncTriggerPromise<Collider> onTriggerEnter;
+        AsyncTriggerPromiseDictionary<Collider> onTriggerEnters;
+        AsyncTriggerPromise<Collider> onTriggerExit;
+        AsyncTriggerPromiseDictionary<Collider> onTriggerExits;
+        AsyncTriggerPromise<Collider> onTriggerStay;
+        AsyncTriggerPromiseDictionary<Collider> onTriggerStays;
+
+
+        protected override IEnumerable<ICancelablePromise> GetPromises()
+        {
+            return Concat(onTriggerEnter, onTriggerEnters, onTriggerExit, onTriggerExits, onTriggerStay, onTriggerStays);
+        }
+
+
+        void OnTriggerEnter(Collider other)
+        {
+            TrySetResult(onTriggerEnter, onTriggerEnters, other);
+        }
+
+
+        public UniTask OnTriggerEnterAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerEnter, ref onTriggerEnters, cancellationToken);
+        }
+
+
+        void OnTriggerExit(Collider other)
+        {
+            TrySetResult(onTriggerExit, onTriggerExits, other);
+        }
+
+
+        public UniTask OnTriggerExitAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerExit, ref onTriggerExits, cancellationToken);
+        }
+
+
+        void OnTriggerStay(Collider other)
+        {
+            TrySetResult(onTriggerStay, onTriggerStays, other);
+        }
+
+
+        public UniTask OnTriggerStayAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return GetOrAddPromise(ref onTriggerStay, ref onTriggerStays, cancellationToken);
+        }
+
+
+    }
+}
+
+#endif
+