port from perforce

intromat/NodeNetwork/Views/ErrorMessageView.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reactive.Disposables;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using NodeNetwork.ViewModels;
+using ReactiveUI;
+
+namespace NodeNetwork.Views
+{
+    [TemplatePart(Name = nameof(TextBlock), Type = typeof(TextBlock))]
+    public class ErrorMessageView : Control, IViewFor<ErrorMessageViewModel>
+    {
+        #region ViewModel
+        public static readonly DependencyProperty ViewModelProperty = DependencyProperty.Register(nameof(ViewModel),
+            typeof(ErrorMessageViewModel), typeof(ErrorMessageView), new PropertyMetadata(null));
+
+        public ErrorMessageViewModel ViewModel
+        {
+            get => (ErrorMessageViewModel)GetValue(ViewModelProperty);
+            set => SetValue(ViewModelProperty, value);
+        }
+
+        object IViewFor.ViewModel
+        {
+            get => ViewModel;
+            set => ViewModel = (ErrorMessageViewModel)value;
+        }
+        #endregion
+
+        private TextBlock TextBlock { get; set; }
+
+        public ErrorMessageView()
+        {
+            DefaultStyleKey = typeof(ErrorMessageView);
+
+            SetupBindings();
+        }
+
+        private void SetupBindings()
+        {
+            this.WhenActivated(d =>
+            {
+                this.OneWayBind(ViewModel, vm => vm.Message, v => v.TextBlock.Text).DisposeWith(d);
+            });
+        }
+
+        public override void OnApplyTemplate()
+        {
+            TextBlock = GetTemplateChild(nameof(TextBlock)) as TextBlock;
+        }
+    }
+}