From 40657425c139723bbb3226ae2d29cfb2286350f2 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Sun, 24 Nov 2019 21:58:18 +0100
Subject: [PATCH] Reintroduce coercion to NumericUpDown.

---
 .../NumericUpDown/NumericUpDown.cs            | 33 ++++++++++++++-----
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/src/Avalonia.Controls/NumericUpDown/NumericUpDown.cs b/src/Avalonia.Controls/NumericUpDown/NumericUpDown.cs
index 9bc97e3758a..cbb5b667e73 100644
--- a/src/Avalonia.Controls/NumericUpDown/NumericUpDown.cs
+++ b/src/Avalonia.Controls/NumericUpDown/NumericUpDown.cs
@@ -58,7 +58,7 @@ public class NumericUpDown : TemplatedControl
         /// Defines the <see cref="Increment"/> property.
         /// </summary>
         public static readonly StyledProperty<double> IncrementProperty =
-            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Increment), 1.0d/*, validate: OnCoerceIncrement*/);
+            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Increment), 1.0d, coerce: OnCoerceIncrement);
 
         /// <summary>
         /// Defines the <see cref="IsReadOnly"/> property.
@@ -70,13 +70,13 @@ public class NumericUpDown : TemplatedControl
         /// Defines the <see cref="Maximum"/> property.
         /// </summary>
         public static readonly StyledProperty<double> MaximumProperty =
-            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Maximum), double.MaxValue/*, validate: OnCoerceMaximum*/);
+            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Maximum), double.MaxValue, coerce: OnCoerceMaximum);
 
         /// <summary>
         /// Defines the <see cref="Minimum"/> property.
         /// </summary>
         public static readonly StyledProperty<double> MinimumProperty =
-            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Minimum), double.MinValue/*, validate: OnCoerceMinimum*/);
+            AvaloniaProperty.Register<NumericUpDown, double>(nameof(Minimum), double.MinValue, coerce: OnCoerceMinimum);
 
         /// <summary>
         /// Defines the <see cref="ParsingNumberStyle"/> property.
@@ -738,19 +738,34 @@ private void SetValueInternal(double value)
             }
         }
 
-        private static double OnCoerceMaximum(NumericUpDown upDown, double value)
+        private static double OnCoerceMaximum(IAvaloniaObject instance, double value)
         {
-            return upDown.OnCoerceMaximum(value);
+            if (instance is NumericUpDown upDown)
+            {
+                return upDown.OnCoerceMaximum(value);
+            }
+
+            return value;
         }
 
-        private static double OnCoerceMinimum(NumericUpDown upDown, double value)
+        private static double OnCoerceMinimum(IAvaloniaObject instance, double value)
         {
-            return upDown.OnCoerceMinimum(value);
+            if (instance is NumericUpDown upDown)
+            {
+                return upDown.OnCoerceMinimum(value);
+            }
+
+            return value;
         }
 
-        private static double OnCoerceIncrement(NumericUpDown upDown, double value)
+        private static double OnCoerceIncrement(IAvaloniaObject instance, double value)
         {
-            return upDown.OnCoerceIncrement(value);
+            if (instance is NumericUpDown upDown)
+            {
+                return upDown.OnCoerceIncrement(value);
+            }
+
+            return value;
         }
 
         private void TextBoxOnTextChanged()