增加实时状态保存

SpineViewer/Utils/PropertyWatcher.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace SpineViewer.Utils
+{
+    public static class PropertyWatcher
+    {
+        public static IDisposable Watch(DependencyObject target, DependencyProperty property, Action callback)
+        {
+            var dpd = DependencyPropertyDescriptor.FromProperty(property, target.GetType());
+            if (dpd == null) return null;
+
+            EventHandler handler = (s, e) => callback();
+            dpd.AddValueChanged(target, handler);
+
+            return new Unsubscriber(() => dpd.RemoveValueChanged(target, handler));
+        }
+
+        private class Unsubscriber : IDisposable
+        {
+            private readonly Action _dispose;
+            public Unsubscriber(Action dispose) => _dispose = dispose;
+            public void Dispose() => _dispose();
+        }
+    }
+}