init

Common/DTS.CommonCore/Controls/GridLengthAnimation.cs

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+using System;
+using System.Windows;
+using System.Windows.Media.Animation;
+
+namespace DTS.Common.Controls
+{
+    public class GridLengthAnimation : AnimationTimeline
+    {
+        public GridLengthAnimation()
+        {
+            // no-op
+        }
+
+        public GridLength From
+        {
+            get => (GridLength)GetValue(FromProperty);
+            set => SetValue(FromProperty, value);
+        }
+
+        public static readonly DependencyProperty FromProperty =
+            DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation));
+
+        public GridLength To
+        {
+            get => (GridLength)GetValue(ToProperty);
+            set => SetValue(ToProperty, value);
+        }
+
+        public static readonly DependencyProperty ToProperty =
+            DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation));
+
+        public override Type TargetPropertyType => typeof(GridLength);
+
+        protected override Freezable CreateInstanceCore()
+        {
+            return new GridLengthAnimation();
+        }
+
+        public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
+        {
+            var fromValue = From.Value;
+            var toValue = To.Value;
+
+            if (fromValue > toValue)
+            {
+                return new GridLength((1 - animationClock.CurrentProgress.Value) * (fromValue - toValue) + toValue, To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
+            }
+            return new GridLength(animationClock.CurrentProgress.Value * (toValue - fromValue) + fromValue, To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
+        }
+    }
+}