Gui-Tuning

Jugenddienst Stunden/Converter/CollectionVisibilityConverter.cs

@@ -0,0 +1,21 @@
+using System.Globalization;
+
+/// Gib true zurück, wenn die Collection Werte enthält
+namespace Jugenddienst_Stunden.Converter {
+    internal class CollectionVisibilityConverter : IValueConverter {
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture) {
+            if (value is IEnumerable<object> collection) {
+                if ((string)parameter == "Invert")
+                    return !collection.Any();
+                return collection.Any();
+            }
+            if ((string)parameter == "Invert")
+                return true;
+            return false;
+        }
+
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) {
+            throw new NotImplementedException();
+        }
+    }
+}