lang support for binding

src/Shared/HandyControl_Shared/Controls/Growl/Growl.cs

@@ -8,6 +8,7 @@ using System.Windows.Media;
 using System.Windows.Threading;
 using HandyControl.Data;
 using HandyControl.Interactivity;
+using HandyControl.Properties.Langs;
 using HandyControl.Tools;
 using HandyControl.Tools.Extension;
 
@@ -297,10 +298,9 @@ namespace HandyControl.Controls
         {
             if (panel == null) return;
 
-            var menuItem = new MenuItem
-            {
-                Header = Properties.Langs.Lang.Clear
-            };
+            var menuItem = new MenuItem();
+            LangDecorator.SetLang(menuItem, HeaderedItemsControl.HeaderProperty, LangKeys.Clear);
+
             menuItem.Click += (s, e) =>
             {
                 foreach (var item in panel.Children.OfType<Growl>())

src/Shared/HandyControl_Shared/Properties/Langs/LangDecorator.cs

@@ -1,5 +1,7 @@
 using System.ComponentModel;
 using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
 using HandyControl.Tools;
 
 namespace HandyControl.Properties.Langs
@@ -10,7 +12,7 @@ namespace HandyControl.Properties.Langs
 
         private static string CultureInfoStr;
 
-        public static CultureInfo Culture
+        internal static CultureInfo Culture
         {
             get => Lang.Culture;
             set
@@ -24,6 +26,13 @@ namespace HandyControl.Properties.Langs
             }
         }
 
+        public static void SetLang(DependencyObject dependencyObject, DependencyProperty dependencyProperty, string key) =>
+            BindingOperations.SetBinding(dependencyObject, dependencyProperty, new Binding(key)
+            {
+                Source = Instance,
+                Mode = BindingMode.OneWay
+            });
+
 		private void UpdateLangs()
         {
 			OnPropertyChanged(nameof(Am));

src/Shared/HandyControl_Shared/Properties/Langs/LangDecorator.tt

@@ -19,6 +19,8 @@
 #>
 using System.ComponentModel;
 using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
 using HandyControl.Tools;
 
 namespace HandyControl.Properties.Langs
@@ -29,7 +31,7 @@ namespace HandyControl.Properties.Langs
 
         private static string CultureInfoStr;
 
-        public static CultureInfo Culture
+        internal static CultureInfo Culture
         {
             get => Lang.Culture;
             set
@@ -43,6 +45,13 @@ namespace HandyControl.Properties.Langs
             }
         }
 
+        public static void SetLang(DependencyObject dependencyObject, DependencyProperty dependencyProperty, string key) =>
+            BindingOperations.SetBinding(dependencyObject, dependencyProperty, new Binding(key)
+            {
+                Source = Instance,
+                Mode = BindingMode.OneWay
+            });
+
 		private void UpdateLangs()
         {
 <#foreach(var item in propertyNameList){#>

src/Shared/HandyControl_Shared/Tools/Extension/LangExtension.cs

@@ -1,42 +1,163 @@
-using HandyControl.Properties.Langs;
-using System;
+using System;
 using System.Windows;
 using System.Windows.Data;
 using System.Windows.Markup;
+using HandyControl.Properties.Langs;
 
 namespace HandyControl.Tools.Extension
 {
     public class LangExtension : MarkupExtension
     {
+        private readonly DependencyObject _proxy;
+
+        private bool _isInternalAction;
+
         public LangExtension()
         {
-
+            _proxy = new DependencyObject();
+            Source = LangDecorator.Instance;
         }
 
-        public LangExtension(string key) => Key = key;
+        public LangExtension(string key) : this()
+        {
+            Key = key;
+        }
 
+        public static readonly DependencyProperty KeyProperty = DependencyProperty.RegisterAttached(
+            "Key", typeof(object), typeof(LangExtension), new PropertyMetadata(default));
+
+        public object Key
+        {
+            get => _proxy.GetValue(KeyProperty);
+            set => _proxy.SetValue(KeyProperty, value);
+        }
+
+        private static readonly DependencyProperty TargetPropertyProperty = DependencyProperty.RegisterAttached(
+            "TargetProperty", typeof(DependencyProperty), typeof(LangExtension), new PropertyMetadata(default(DependencyProperty)));
+
+        private static void SetTargetProperty(DependencyObject element, DependencyProperty value)
+            => element.SetValue(TargetPropertyProperty, value);
+
+        private static DependencyProperty GetTargetProperty(DependencyObject element)
+            => (DependencyProperty) element.GetValue(TargetPropertyProperty);
+
+        public BindingMode Mode { get; set; }
+
+        public IValueConverter Converter { get; set; }
+        
+        public object ConverterParameter { get; set; }
+        
+        public object Source { get; set; }
+        
         public override object ProvideValue(IServiceProvider serviceProvider)
         {
-            if (!(serviceProvider.GetService(typeof(IProvideValueTarget)) is IProvideValueTarget pvt))
-                return null;
+            if (_isInternalAction) return this;
+            if (!(serviceProvider.GetService(typeof(IProvideValueTarget)) is IProvideValueTarget provideValueTarget)) return this;
+            if (provideValueTarget.TargetObject.GetType().FullName == "System.Windows.SharedDp") return this;
+            if (!(provideValueTarget.TargetObject is DependencyObject targetObject)) return this;
+            if (!(provideValueTarget.TargetProperty is DependencyProperty targetProperty)) return this;
 
-            if (!(pvt.TargetObject is DependencyObject targetObject))
-                return null;
-
-            if (!(pvt.TargetProperty is DependencyProperty targetProperty))
-                return null;
-
-            var binding = new Binding(Key)
+            switch (Key)
             {
-                Source = LangSource,
-                Mode = BindingMode.OneWay
-            };
-            BindingOperations.SetBinding(targetObject, targetProperty, binding);
-            return binding.ProvideValue(serviceProvider);
+                case string key:
+                {
+                    var binding = new Binding(key)
+                    {
+                        Converter = Converter,
+                        ConverterParameter = ConverterParameter,
+                        UpdateSourceTrigger = UpdateSourceTrigger.Explicit,
+                        Source = Source,
+                        Mode = BindingMode.OneWay
+                    };
+                    BindingOperations.SetBinding(targetObject, targetProperty, binding);
+                    return binding.ProvideValue(serviceProvider);
+                }
+                case Binding keyBinding when targetObject is FrameworkElement element:
+                {
+                    if (element.DataContext != null)
+                    {
+                        _isInternalAction = true;
+                        SetLangBinding(element, targetProperty, keyBinding.Path, element.DataContext);
+                        _isInternalAction = false;
+                    }
+                    else
+                    {
+                        SetTargetProperty(element, targetProperty);
+                        element.DataContextChanged += LangExtension_DataContextChanged;
+                    }
+
+                    break;
+                }
+                case Binding keyBinding when targetObject is FrameworkContentElement element:
+                {
+                    if (element.DataContext != null)
+                    {
+                        _isInternalAction = true;
+                        SetLangBinding(element, targetProperty, keyBinding.Path, element.DataContext);
+                        _isInternalAction = false;
+                    }
+                    else
+                    {
+                        SetTargetProperty(element, targetProperty);
+                        element.DataContextChanged += LangExtension_DataContextChanged;
+                    }
+
+                    break;
+                }
+            }
+
+            return string.Empty;
         }
 
-        public string Key { get; set; }
+        private void LangExtension_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
+        {
+            switch (sender)
+            {
+                case FrameworkElement element:
+                {
+                    element.DataContextChanged -= LangExtension_DataContextChanged;
+                    if (!(Key is Binding keyBinding)) return;
 
-        public virtual object LangSource => LangDecorator.Instance;
+                    var targetProperty = GetTargetProperty(element);
+                    SetTargetProperty(element, null);
+                    SetLangBinding(element, targetProperty, keyBinding.Path, element.DataContext);
+                    break;
+                }
+                case FrameworkContentElement element:
+                {
+                    element.DataContextChanged -= LangExtension_DataContextChanged;
+                    if (!(Key is Binding keyBinding)) return;
+
+                    var targetProperty = GetTargetProperty(element);
+                    SetTargetProperty(element, null);
+                    SetLangBinding(element, targetProperty, keyBinding.Path, element.DataContext);
+                    break;
+                }
+            }
+        }
+
+        private void SetLangBinding(DependencyObject targetObject, DependencyProperty targetProperty, PropertyPath path, object dataContext)
+        {
+            if (targetProperty == null) return;
+
+            BindingOperations.SetBinding(targetObject, targetProperty, new Binding
+            {
+                Path = path,
+                Source = dataContext,
+                Mode = BindingMode.OneWay
+            });
+
+            var key = targetObject.GetValue(targetProperty) as string;
+            if (string.IsNullOrEmpty(key)) return;
+
+            BindingOperations.SetBinding(targetObject, targetProperty, new Binding(key)
+            {
+                Converter = Converter,
+                ConverterParameter = ConverterParameter,
+                UpdateSourceTrigger = UpdateSourceTrigger.Explicit,
+                Source = Source,
+                Mode = BindingMode.OneWay
+            });
+        }
     }
 }

src/Shared/HandyControl_Shared/Tools/Helper/ConfigHelper.cs

@@ -10,6 +10,7 @@ using System.Windows.Media.Animation;
 using System.Windows.Navigation;
 using HandyControl.Controls;
 using HandyControl.Data;
+using HandyControl.Properties.Langs;
 
 namespace HandyControl.Tools
 {
@@ -37,13 +38,11 @@ namespace HandyControl.Tools
             }
         }
 
-        public void SetSystemVersionInfo(SystemVersionInfo info)
-        {
-            BlurWindow.SystemVersionInfo = info;           
-        }
+        public void SetSystemVersionInfo(SystemVersionInfo info) => BlurWindow.SystemVersionInfo = info;
 
         public void SetLang(string lang)
         {
+            LangDecorator.Culture = new CultureInfo(lang);
             Application.Current.Dispatcher.Thread.CurrentUICulture = new CultureInfo(lang);
             Lang = XmlLanguage.GetLanguage(lang);
         }