added a very basic mouse events sample

Author: ritamerkl

Assets/Samples/MouseEvents.meta

@@ -0,0 +1,46 @@
+using System;
+using UnityEngine;
+using UnityEngine.InputSystem;
+using UnityEngine.InputSystem.EnhancedTouch;
+using Touch = UnityEngine.InputSystem.EnhancedTouch.Touch;
+
+public class OnMouseEventsTest : MonoBehaviour
+{
+    private Vector3 screenPoint;
+    private Vector3 offset;
+
+    private void Start()
+    {
+        EnhancedTouchSupport.Enable();
+    }
+
+    void OnMouseDown()
+    {
+        screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);
+        float x;
+        float y;
+        if (Pointer.current != null)
+        {
+            x = Pointer.current.position.x.value;
+            y = Pointer.current.position.y.value;
+        }
+        else  // Fallback to InputManager if InputSystem is not available
+        {
+            x = Input.mousePosition.x;
+            y = Input.mousePosition.y;
+        }
+        offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(x, y, screenPoint.z));
+    }
+
+    void OnMouseDrag()
+    {
+        Vector3 curScreenPoint;
+        if (Pointer.current != null)
+            curScreenPoint = new Vector3(Pointer.current.position.x.value, Pointer.current.position.y.value, screenPoint.z);
+        else // Fallback to InputManager if InputSystem is not available
+            curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
+
+        Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
+        transform.position = curPosition;
+    }
+}