support for .NET framework 3.5

Still have bugs
2019-01-21 00:43:10 +08:00
1 parent 5878039e21
commit 7d6b491f25
@@ -0,0 +1,76 @@
+using System;
+using System.Windows;
+
+namespace HandyControl.Expression.Media
+{
+    internal class DrawingPropertyMetadata : FrameworkPropertyMetadata
+    {
+#pragma warning disable 414
+        private DrawingPropertyMetadataOptions options;
+#pragma warning restore 414
+
+        private PropertyChangedCallback propertyChangedCallback;
+
+        public static event EventHandler<DrawingPropertyChangedEventArgs> DrawingPropertyChanged;
+
+        static DrawingPropertyMetadata()
+        {
+            DrawingPropertyChanged += delegate (object sender, DrawingPropertyChangedEventArgs args) {
+                if ((sender is IShape shape) && args.Metadata.AffectsRender)
+                {
+                    InvalidateGeometryReasons reasons = InvalidateGeometryReasons.PropertyChanged;
+                    if (args.IsAnimated)
+                    {
+                        reasons |= InvalidateGeometryReasons.IsAnimated;
+                    }
+                    shape.InvalidateGeometry(reasons);
+                }
+            };
+        }
+
+        public DrawingPropertyMetadata(object defaultValue) : this(defaultValue, DrawingPropertyMetadataOptions.None, null)
+        {
+        }
+
+        public DrawingPropertyMetadata(PropertyChangedCallback propertyChangedCallback) : this(DependencyProperty.UnsetValue, DrawingPropertyMetadataOptions.None, propertyChangedCallback)
+        {
+        }
+
+        private DrawingPropertyMetadata(DrawingPropertyMetadataOptions options, object defaultValue) : base(defaultValue, (FrameworkPropertyMetadataOptions)options)
+        {
+        }
+
+        public DrawingPropertyMetadata(object defaultValue, DrawingPropertyMetadataOptions options) : this(defaultValue, options, null)
+        {
+        }
+
+        public DrawingPropertyMetadata(object defaultValue, DrawingPropertyMetadataOptions options, PropertyChangedCallback propertyChangedCallback) : base(defaultValue, (FrameworkPropertyMetadataOptions)options, AttachCallback(defaultValue, options, propertyChangedCallback))
+        {
+        }
+
+        private static PropertyChangedCallback AttachCallback(object defaultValue, DrawingPropertyMetadataOptions options, PropertyChangedCallback propertyChangedCallback)
+        {
+            DrawingPropertyMetadata metadata = new DrawingPropertyMetadata(options, defaultValue)
+            {
+                options = options,
+                propertyChangedCallback = propertyChangedCallback
+            };
+            return metadata.InternalCallback;
+        }
+
+        private void InternalCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
+        {
+            if (DrawingPropertyChanged != null)
+            {
+                DrawingPropertyChangedEventArgs args = new DrawingPropertyChangedEventArgs
+                {
+                    Metadata = this,
+                    IsAnimated = DependencyPropertyHelper.GetValueSource(sender, e.Property).IsAnimated
+                };
+                DrawingPropertyChanged(sender, args);
+            }
+
+            propertyChangedCallback?.Invoke(sender, e);
+        }
+    }
+}