Edit Username, New Chat Dialog

PolyChat/Views/EditUsernameDialog.xaml.cs

@@ -0,0 +1,51 @@
+using PolyChat.Models;
+using PolyChat.Util;
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Media;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
+
+namespace PolyChat.Views
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class EditUsernameDialog : ContentDialog
+    {
+        public EditUsernameDialog(string initialValue)
+        {
+            this.InitializeComponent();
+            if (initialValue == null || initialValue.Length == 0) IsSecondaryButtonEnabled = false;
+            else  input.Text = initialValue;
+            validate();
+        }
+
+        public string getValue()
+        {
+            return input.Text;
+        }
+
+        private void OnKeyUp(object sender, Windows.UI.Xaml.Input.KeyRoutedEventArgs e)
+        {
+            validate();
+        }
+
+        private void validate()
+        {
+            if (input.Text.Length == 0)
+            {
+                textError.Visibility = Visibility.Visible;
+                IsPrimaryButtonEnabled = false;
+            }
+            else
+            {
+                textError.Visibility = Visibility.Collapsed;
+                IsPrimaryButtonEnabled = true;
+            }
+        }
+    }
+}