BeWoPlaner/BeWo/Scheduler/View/EmployeeBrushConverter.cs

using System;
using System.Globalization;
using System.Linq;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;
using BeWo.Scheduler.ViewModel;

using DevExpress.XtraScheduler;

namespace BeWo.Scheduler.View
{
    public class EmployeeBrushConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            var farbe = Color.FromRgb(192, 255, 208);
            var gradientCollection = new GradientStopCollection { new GradientStop(farbe, 1) };

            if(values[2] is bool b && b == false)
            {
                return gradientCollection;
            }

            try
            {
                if(!(values[1] is CustomFieldCollection customViewInfo))
                {
                    return new LinearGradientBrush(new GradientStopCollection { new GradientStop(farbe, 1) }, new Point(.5, 0), new Point(.5, 1));
                }

                var customFieldStorage = (CustomFieldStorage) customViewInfo[nameof(CustomFieldStorage)];
                
                var aptEmployees = customFieldStorage.EmployeeList;
                var ersteller = customFieldStorage.Originator;

                if(aptEmployees.Count > 0)
                {
                    var firstEmployeeInList = aptEmployees.First(f => f.Employee.EmployeeColor != null);
                    gradientCollection = new GradientStopCollection { new GradientStop(firstEmployeeInList.Employee.FilterableBrush.Color, 1) };
                }
                else if(!string.IsNullOrEmpty(ersteller.EmployeeColor))
                {
                    gradientCollection = new GradientStopCollection {new GradientStop(ersteller.FilterableBrush.Color, 1)};
                }

                return new LinearGradientBrush(gradientCollection, new Point(.5, 0), new Point(.5, 1));
            }
            catch (Exception)
            {
                return new LinearGradientBrush(new GradientStopCollection { new GradientStop(farbe, 1) }, new Point(.5, 0), new Point(.5, 1));
            }
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}