feat: update demo

demo/Ursa.Demo/Pages/IPv4BoxDemo.axaml

@@ -4,14 +4,32 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:pages="clr-namespace:Ursa.Demo.Pages"
     xmlns:u="https://irihi.tech/ursa"
     d:DesignHeight="450"
     d:DesignWidth="800"
     mc:Ignorable="d">
+    <Design.DataContext>
+        <pages:IPv4DemoViewMode />
+    </Design.DataContext>
     <StackPanel HorizontalAlignment="Left">
-        <u:IPv4Box Name="box" Width="200" />
-        <u:IPv4Box Width="200" IsEnabled="False" />
+        <ToggleButton
+            Name="format"
+            Margin="0,0,0,50"
+            Content="Show Leading Zeroes" />
+
+        <u:IPv4Box
+            Name="box"
+            Width="200"
+            ShowLeadingZero="{Binding #format.IsChecked}" />
         <TextBlock Text="IP: " />
         <TextBlock Text="{Binding #box.IPAddress}" />
+
+        <RepeatButton Command="{Binding ChangeAddress}" Content="Random" />
+        <u:IPv4Box
+            Width="200"
+            IPAddress="{Binding Address}"
+            ShowLeadingZero="{Binding #format.IsChecked}" />
+        <u:IPv4Box Width="200" IsEnabled="False" />
     </StackPanel>
 </UserControl>

demo/Ursa.Demo/Pages/IPv4BoxDemo.axaml.cs

@@ -1,6 +1,9 @@
+using System;
+using System.Net;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
+using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Ursa.Demo.Pages;
 
@@ -9,10 +12,18 @@ public partial class IPv4BoxDemo : UserControl
     public IPv4BoxDemo()
     {
         InitializeComponent();
-    }
-
-    private void InitializeComponent()
-    {
-        AvaloniaXamlLoader.Load(this);
+        DataContext = new IPv4DemoViewMode();
+    }
+}
+
+public partial class IPv4DemoViewMode: ObservableObject
+{
+    [ObservableProperty]
+    private IPAddress? _address;
+
+    public void ChangeAddress()
+    {
+        long l = Random.Shared.NextInt64(0x00000000FFFFFFFF);
+        Address = new IPAddress(l);
     }
 }

src/Ursa/Controls/IPv4Box.cs

@@ -90,6 +90,7 @@ public class IPv4Box: TemplatedControl
     static IPv4Box()
     {
         ShowLeadingZeroProperty.Changed.AddClassHandler<IPv4Box>((o, e) => o.OnFormatChange(e));
+        IPAddressProperty.Changed.AddClassHandler<IPv4Box>((o, e) => o.OnIPChanged(e));
     }
 
     private void OnFormatChange(AvaloniaPropertyChangedEventArgs arg)
@@ -98,6 +99,32 @@ public class IPv4Box: TemplatedControl
         ParseBytes(showLeadingZero);
     }
 
+    private void OnIPChanged(AvaloniaPropertyChangedEventArgs arg)
+    {
+        IPAddress? address = arg.GetNewValue<IPAddress?>();
+        if (address is null)
+        {
+            foreach (var presenter in _presenters)
+            {
+                if(presenter!=null) presenter.Text = string.Empty;
+            }
+            ParseBytes(ShowLeadingZero);
+        }
+        else
+        {
+            var sections = address.ToString().Split('.');
+            for (int i = 0; i < 4; i++)
+            {
+                var presenter = _presenters[i];
+                if (presenter != null)
+                {
+                    presenter.Text = sections[i];
+                }
+            }
+            ParseBytes(ShowLeadingZero);
+        }
+    }
+
     protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
     {
         base.OnApplyTemplate(e);