PaymentAdjustmentWindow: Improve DataGrid and add status bar

Elwig/Controls/UnitConverter.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace Elwig.Controls {
+    public class UnitConverter : DependencyObject, IValueConverter {
+
+        public static readonly DependencyProperty UnitProperty = DependencyProperty.Register("Unit", typeof(string), typeof(UnitConverter), new FrameworkPropertyMetadata(null));
+        public string Unit {
+            get => (string)GetValue(UnitProperty);
+            set => SetValue(UnitProperty, value);
+        }
+
+        public static readonly DependencyProperty PrecisionProperty = DependencyProperty.Register("Precision", typeof(byte), typeof(UnitConverter), new FrameworkPropertyMetadata((byte)0));
+        public byte Precision {
+            get => (byte)GetValue(PrecisionProperty);
+            set => SetValue(PrecisionProperty, value);
+        }
+
+        public object? Convert(object? value, Type targetType, object parameter, CultureInfo culture) {
+            if (value == null) {
+                return null;
+            }
+
+            var fmt = $"{{0:N{Precision}}}";
+            var unit = $"{(Unit != null ? " " : "")}{Unit}";
+            if (value is int i) {
+                return $"{string.Format(fmt, i)}{unit}";
+            } else if (value is decimal d) {
+                return $"{string.Format(fmt, d)}{unit}";
+            }
+
+            return Binding.DoNothing;
+        }
+
+        public object? ConvertBack(object? value, Type targetType, object parameter, CultureInfo culture) {
+            throw new NotImplementedException();
+        }
+    }
+}