Custom TUI Library WIP

src/Library/TerminalUI/Binding.cs

@@ -0,0 +1,49 @@
+using System.ComponentModel;
+using System.Reflection;
+using TerminalUI.Controls;
+using TerminalUI.Traits;
+
+namespace TerminalUI;
+
+public class Binding<TDataContext, TResult> : IDisposable
+{
+    private readonly Func<TDataContext, TResult> _dataContextMapper;
+    private IView<TDataContext> _view;
+    private object? _propertySource;
+    private PropertyInfo _targetProperty;
+
+    public Binding(
+        IView<TDataContext> view, 
+        Func<TDataContext, TResult> dataContextMapper, 
+        object? propertySource, 
+        PropertyInfo targetProperty
+    )
+    {
+        _view = view;
+        _dataContextMapper = dataContextMapper;
+        _propertySource = propertySource;
+        _targetProperty = targetProperty;
+        view.PropertyChanged += View_PropertyChanged;
+        _targetProperty.SetValue(_propertySource, _dataContextMapper(_view.DataContext));
+        
+        if(propertySource is IDisposableCollection disposableCollection)
+            disposableCollection.AddDisposable(this);
+        
+        view.AddDisposable(this);
+    }
+
+    private void View_PropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        if (e.PropertyName != nameof(IView<TDataContext>.DataContext)) return;
+
+        _targetProperty.SetValue(_propertySource, _dataContextMapper(_view.DataContext));
+    }
+
+    public void Dispose()
+    {
+        _view.PropertyChanged -= View_PropertyChanged;
+        _view = null!;
+        _propertySource = null!;
+        _targetProperty = null!;
+    }
+}