Fluent.ComboBox.OnResizeBothDelta C# (CSharp) Method

        private void OnResizeBothDelta(object sender, DragDeltaEventArgs e)
        {
            // Set height
            SetDragHeight(e);

            // Set width
            menuPanel.Width = Double.NaN;
            if (Double.IsNaN(galleryPanel.Width)) galleryPanel.Width = galleryPanel.ActualWidth;

            double monitorRight = RibbonControl.GetControlMonitor(this).Right;
            FrameworkElement popupChild = popup.Child as FrameworkElement;
            double delta = monitorRight - this.PointToScreen(new Point()).X - popupChild.ActualWidth - e.HorizontalChange;
            double deltaX = popupChild.ActualWidth - galleryPanel.ActualWidth;
            double deltaBorders = dropDownBorder.ActualWidth - galleryPanel.ActualWidth;
            if (delta > 0) galleryPanel.Width = Math.Max(galleryPanel.Width + e.HorizontalChange, ActualWidth - deltaBorders);
            else
            {
                galleryPanel.Width = Math.Max(monitorRight - this.PointToScreen(new Point()).X - deltaX, ActualWidth - deltaBorders);
            }
        }