nature_net.user_controls.custom_listbox._list_PreviewTouchDown C# (CSharp) Метод

        private void _list_PreviewTouchDown(object sender, TouchEventArgs e)
        {
            if (!is_tap.ContainsKey(e.TouchDevice.Id))
                this.is_tap.Add(e.TouchDevice.Id, true);
            ScrollViewer scroll = configurations.GetDescendantByType(this._list, typeof(ScrollViewer)) as ScrollViewer;
            last_scroll_offset = scroll.VerticalOffset;
            //scroll.Elasticity = new Vector(0.0, 0.4);
            bool r = e.TouchDevice.Capture(this._list as IInputElement, CaptureMode.SubTree);
            e.Handled = true;
        }