From 8e128c9b247a3f98f19d75c9d340e94a6fa3c980 Mon Sep 17 00:00:00 2001
From: robloo <robloo@users.noreply.github.com>
Date: Thu, 28 Apr 2022 18:09:19 -0400
Subject: [PATCH] Add ValueConverterGroup

---
 .../Converters/ValueConverterGroup.cs         | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/Avalonia.Controls.ColorPicker/Converters/ValueConverterGroup.cs

diff --git a/src/Avalonia.Controls.ColorPicker/Converters/ValueConverterGroup.cs b/src/Avalonia.Controls.ColorPicker/Converters/ValueConverterGroup.cs
new file mode 100644
index 0000000000..2710c220f4
--- /dev/null
+++ b/src/Avalonia.Controls.ColorPicker/Converters/ValueConverterGroup.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace Avalonia.Controls.Primitives.Converters
+{
+    /// <summary>
+    /// Converter to chain together multiple converters.
+    /// </summary>
+    public class ValueConverterGroup : List<IValueConverter>, IValueConverter
+    {
+        /// <inheritdoc/>
+        /// <inheritdoc/>
+        public object? Convert(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
+        {
+            object? curValue;
+
+            curValue = value;
+            for (int i = 0; i < Count; i++)
+            {
+                curValue = this[i].Convert(curValue, targetType, parameter, culture);
+            }
+
+            return curValue;
+        }
+
+        /// <inheritdoc/>
+        public object? ConvertBack(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
+        {
+            object? curValue;
+
+            curValue = value;
+            for (int i = (Count - 1); i >= 0; i--)
+            {
+                curValue = this[i].ConvertBack(curValue, targetType, parameter, culture);
+            }
+
+            return curValue;
+        }
+    }
+}