UnityEditor.SceneViewMotion.DoViewTool C# (CSharp) Method

        public static void DoViewTool(SceneView view)
        {
            Event current = Event.current;
            int controlID = s_ViewToolID;
            EventType typeForControl = current.GetTypeForControl(controlID);
            if ((view != null) && (Tools.s_LockedViewTool == ViewTool.FPS))
            {
                view.FixNegativeSize();
            }
            switch (typeForControl)
            {
                case EventType.MouseDown:
                    HandleMouseDown(view, controlID, current.button);
                    break;

                case EventType.MouseUp:
                    HandleMouseUp(view, controlID, current.button, current.clickCount);
                    break;

                case EventType.MouseDrag:
                    HandleMouseDrag(view, controlID);
                    break;

                case EventType.KeyDown:
                    HandleKeyDown(view);
                    break;

                case EventType.KeyUp:
                    HandleKeyUp();
                    break;

                case EventType.ScrollWheel:
                    HandleScrollWheel(view, !current.alt);
                    break;

                case EventType.Layout:
                {
                    Vector3 movementDirection = GetMovementDirection();
                    if ((GUIUtility.hotControl == controlID) && (movementDirection.sqrMagnitude != 0f))
                    {
                        view.pivot += view.rotation * movementDirection;
                        view.Repaint();
                    }
                    break;
                }
            }
        }