Add project files.

2022-11-01 15:26:08 +00:00
parent daa7b59f22
commit 7e4f880821
408 changed files with 16863 additions and 0 deletions
@@ -0,0 +1,86 @@
+using System;
+using System.Windows;
+using System.Windows.Data;
+
+namespace TheXamlGuy.UI.WPF
+{
+    public class PropertyChangedRevoker : DependencyObject, IDisposable
+    {
+        public static readonly DependencyProperty ValueProperty =
+            DependencyProperty.Register(nameof(Value), typeof(object),
+                typeof(PropertyChangedRevoker), new PropertyMetadata(null, OnValuePropertyChanged));
+
+        private readonly WeakReference weakPropertySource;
+
+        public PropertyChangedRevoker(DependencyObject propertySource, string path,
+            DependencyPropertyChangedEventHandler valueChangedHandler) : this(propertySource, new PropertyPath(path),
+            valueChangedHandler)
+        {
+        }
+
+        public PropertyChangedRevoker(DependencyObject propertySource, DependencyProperty property,
+            DependencyPropertyChangedEventHandler valueChangedHandler) : this(propertySource,
+            new PropertyPath(property), valueChangedHandler)
+        {
+        }
+
+        public PropertyChangedRevoker(DependencyObject propertySource, PropertyPath property,
+            DependencyPropertyChangedEventHandler valueChangedHandler)
+        {
+            weakPropertySource = new WeakReference(propertySource);
+
+            Binding binding = new Binding
+            {
+                Path = property,
+                Mode = BindingMode.OneWay,
+                Source = propertySource
+            };
+
+            BindingOperations.SetBinding(this, ValueProperty, binding);
+            ValueChanged = valueChangedHandler;
+            Property = property;
+        }
+
+        public DependencyObject PropertySource
+        {
+            get
+            {
+                try
+                {
+                    return weakPropertySource.IsAlive ? weakPropertySource.Target as DependencyObject : null;
+                }
+                catch
+                {
+                    return null;
+                }
+            }
+        }
+
+        public object Value
+        {
+            get => GetValue(ValueProperty);
+            set => SetValue(ValueProperty, value);
+        }
+
+        public PropertyPath Property { get; }
+
+        public void Dispose()
+        {
+            BindingOperations.ClearBinding(this, ValueProperty);
+        }
+
+        private event DependencyPropertyChangedEventHandler ValueChanged;
+
+        private static void OnValuePropertyChanged(DependencyObject dependencyObject,
+            DependencyPropertyChangedEventArgs args)
+        {
+            PropertyChangedRevoker sender = dependencyObject as PropertyChangedRevoker;
+            sender?.OnValuePropertyChanged(args);
+        }
+
+        private void OnValuePropertyChanged(DependencyPropertyChangedEventArgs args)
+        {
+            ValueChanged?.Invoke(this, args);
+        }
+    }
+}