feat: implement verificationcodeitem and corresponding delete operation.

demo/Ursa.Demo/Pages/VerificationCodeDemo.axaml

@@ -3,11 +3,14 @@
              xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:u="https://irihi.tech/ursa"
+             xmlns:vm="using:Ursa.Demo.ViewModels"
+             x:DataType="vm:VerificationCodeDemoViewModel"
+             x:CompileBindings="True"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="Ursa.Demo.Pages.VerificationCodeDemo">
     <StackPanel>
-        <u:VerificationCode CountOfDigit="4" Name="v4"/>
+        <u:VerificationCode Count="4" Name="v4" CompleteCommand="{Binding CompleteCommand}"/>
         <ListBox ItemsSource="{Binding #v4.Digits}"></ListBox>
-        <u:VerificationCode CountOfDigit="6" PasswordChar="*" />
+        <u:VerificationCode Count="6" PasswordChar="•" Complete="VerificationCode_OnComplete" />
     </StackPanel>
 </UserControl>

demo/Ursa.Demo/Pages/VerificationCodeDemo.axaml.cs

@@ -1,6 +1,7 @@
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
+using Ursa.Controls;
 
 namespace Ursa.Demo.Pages;
 
@@ -10,4 +11,10 @@ public partial class VerificationCodeDemo : UserControl
     {
         InitializeComponent();
     }
+
+    private async void VerificationCode_OnComplete(object? sender, VerificationCodeCompleteEventArgs e)
+    {
+        var text = string.Join(string.Empty, e.Code);
+        await MessageBox.ShowOverlayAsync(text);
+    }
 }