AppStartupGuide.MainPage.UpdateSectionHeader C# (CSharp) Method

        void UpdateSectionHeader(Panel section, Panel sectionHeader, CompositeTransform headerTransform, CompositeTransform headerContentTransform, double multiplier)
        {
            var travelledDistance = Math.Abs(ScrollingHost.VerticalOffset - ActualHeight * multiplier);
            if (travelledDistance <= FIXED_TRAVELLED_DISTANCE)
            {
                sectionHeader.Opacity = 1;
            }
            else
            {
                var opacity = 1 - travelledDistance / sectionHeader.ActualHeight;
                sectionHeader.Opacity = opacity;
            }

            headerTransform.TranslateY = (ScrollingHost.VerticalOffset - ActualHeight * multiplier) * HEADER_MOVEMENT_FACTOR;
            headerContentTransform.TranslateY = (ScrollingHost.VerticalOffset - ActualHeight * multiplier) * HEADER_CONTENT_MOVEMENT_FACTOR;
        }