UnityEditor.VertexSnapping.EnableVertexSnapping C# (CSharp) Method

        private static void EnableVertexSnapping(int id)
        {
            Tools.vertexDragging = true;
            if (GUIUtility.hotControl == id)
            {
                Tools.handleOffset = s_VertexSnappingOffset;
            }
            else
            {
                UpdateVertexSnappingOffset();
                s_VertexSnappingOffset = Tools.handleOffset;
            }
        }

        public static void HandleKeyAndMouseMove(int id)
        {
            Event current = Event.current;

            switch (current.GetTypeForControl(id))
            {
            case EventType.MouseMove:
                if (!Tools.vertexDragging)
                {
                    break;
                }
                VertexSnapping.EnableVertexSnapping(id);
                current.Use();
                break;

            case EventType.KeyDown:
                if (current.keyCode != KeyCode.V)
                {
                    break;
                }
                if (!Tools.vertexDragging && !current.shift)
                {
                    VertexSnapping.EnableVertexSnapping(id);
                }
                current.Use();
                break;

            case EventType.KeyUp:
                if (current.keyCode != KeyCode.V)
                {
                    break;
                }
                if (current.shift)
                {
                    Tools.vertexDragging = !Tools.vertexDragging;
                }
                else if (Tools.vertexDragging)
                {
                    Tools.vertexDragging = false;
                }
                if (Tools.vertexDragging)
                {
                    VertexSnapping.EnableVertexSnapping(id);
                }
                else
                {
                    VertexSnapping.DisableVertexSnapping(id);
                }
                current.Use();
                break;
            }
        }