Add project files.

VirtualKeyboard/VKeyboard.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using VirtualKeyboard.Wpf.Controls;
+using VirtualKeyboard.Wpf.ViewModels;
+using VirtualKeyboard.Wpf.Views;
+
+namespace VirtualKeyboard.Wpf
+{
+    public static class VKeyboard
+    {
+        private const string _keyboardValueName = "KeyboardValueContent";
+        private const string _keyboardName = "KeyboardContent";
+
+        private static Type _hostType = typeof(DefaultKeyboardHost);
+
+        private static TaskCompletionSource<string> _tcs;
+        private static Window _windowHost;
+
+        public static void Config(Type hostType)
+        {
+            if (hostType.IsSubclassOf(typeof(Window))) _hostType = hostType;
+            else throw new ArgumentException();
+        }
+
+        public static void Listen<T>(Expression<Func<T, string>> property) where T: UIElement
+        {
+            EventManager.RegisterClassHandler(typeof(T), UIElement.PreviewMouseLeftButtonDownEvent, (RoutedEventHandler)(async (s, e) =>
+            {
+                if (s is AdvancedTextBox) return;
+                var memberSelectorExpression = property.Body as MemberExpression;
+                if (memberSelectorExpression == null) return;
+                var prop = memberSelectorExpression.Member as PropertyInfo;
+                if (prop == null) return;
+                var initValue = (string)prop.GetValue(s);
+                var value = await OpenAsync(initValue);
+                prop.SetValue(s, value, null);
+            }));
+        }
+
+        public static Task<string> OpenAsync(string initialValue = "")
+        {
+            if (_windowHost != null) throw new InvalidOperationException();
+
+            _tcs = new TaskCompletionSource<string>();
+            _windowHost = (Window)Activator.CreateInstance(_hostType);
+            _windowHost.DataContext = new VirtualKeyboardViewModel(initialValue);
+            ((ContentControl)_windowHost.FindName(_keyboardValueName)).Content = new KeyboardValueView();
+            ((ContentControl)_windowHost.FindName(_keyboardName)).Content = new VirtualKeyboardView();
+            void handler(object s, CancelEventArgs a)
+            {
+                var result = GetResult();
+                ((Window)s).Closing -= handler;
+                _windowHost = null;
+                _tcs?.SetResult(result);
+                _tcs = null;
+            }
+
+            _windowHost.Closing += handler;
+
+            _windowHost.Owner = Application.Current.MainWindow;
+            _windowHost.Show();
+            return _tcs.Task;
+        }
+
+        public static void Close()
+        {
+            if (_windowHost == null) throw new InvalidOperationException();
+
+            _windowHost.Close();
+        }
+
+        private static string GetResult()
+        {
+            var viewModel = (VirtualKeyboardViewModel)_windowHost.DataContext;
+            return viewModel.KeyboardText;
+        }
+    }
+}