Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.UWP/Dialogs/TextInputDialog.xaml.cs

@@ -0,0 +1,45 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+
+namespace Wino.Dialogs
+{
+    public sealed partial class TextInputDialog : ContentDialog
+    {
+        public bool? HasInput { get; set; }
+
+        public string CurrentInput
+        {
+            get { return (string)GetValue(CurrentInputProperty); }
+            set { SetValue(CurrentInputProperty, value); }
+        }
+
+        public static readonly DependencyProperty CurrentInputProperty = DependencyProperty.Register(nameof(CurrentInput), typeof(string), typeof(TextInputDialog), new PropertyMetadata(string.Empty));
+
+        public TextInputDialog()
+        {
+            InitializeComponent();
+        }
+
+        public void SetDescription(string description)
+        {
+            DialogDescription.Text = description;
+        }
+
+        public void SetPrimaryButtonText(string text)
+        {
+            PrimaryButtonText = text;
+        }
+
+        private void CancelClicked(ContentDialog sender, ContentDialogButtonClickEventArgs args)
+        {
+            Hide();
+        }
+
+        private void UpdateOrCreateClicked(ContentDialog sender, ContentDialogButtonClickEventArgs args)
+        {
+            HasInput = true;
+
+            Hide();
+        }
+    }
+}