feat: add new autocomplete box.

demo/Ursa.Demo/Pages/AutoCompleteBoxDemo.axaml

@@ -0,0 +1,48 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             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:viewModels="clr-namespace:Ursa.Demo.ViewModels"
+             xmlns:u="https://irihi.tech/ursa"
+             x:DataType="viewModels:AutoCompleteBoxDemoViewModel"
+             mc:Ignorable="d" d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="Ursa.Demo.Pages.AutoCompleteBoxDemo">
+    <StackPanel HorizontalAlignment="Left" Spacing="20">
+        <StackPanel.Styles>
+            <Style Selector="AutoCompleteBox">
+                <Setter Property="Width" Value="300" />
+                <Setter Property="ItemsSource">
+                    <Binding Path="States" />
+                </Setter>
+                <Setter Property="ItemTemplate">
+                    <DataTemplate DataType="viewModels:StateData">
+                        <TextBlock Text="{Binding Name}" />
+                    </DataTemplate>
+                </Setter>
+            </Style>
+        </StackPanel.Styles>
+
+        <u:AutoCompleteBox
+            Watermark="Please select a State"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+        <u:AutoCompleteBox
+            Classes="Large"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+        <u:AutoCompleteBox
+            Classes="Small"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+        <u:AutoCompleteBox
+            Classes="Bordered"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+        <u:AutoCompleteBox
+            IsEnabled="False"
+            Watermark="Disabled"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+        <u:AutoCompleteBox
+            InnerLeftContent="https://"
+            InnerRightContent=".com"
+            ValueMemberBinding="{ReflectionBinding Name}" />
+
+    </StackPanel>
+</UserControl>

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

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Ursa.Demo.Pages;
+
+public partial class AutoCompleteBoxDemo : UserControl
+{
+    public AutoCompleteBoxDemo()
+    {
+        InitializeComponent();
+    }
+}

demo/Ursa.Demo/ViewModels/AutoCompleteBoxDemoViewModel.cs

@@ -0,0 +1,86 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public class AutoCompleteBoxDemoViewModel : ObservableObject
+{
+    public AutoCompleteBoxDemoViewModel()
+    {
+        States = new ObservableCollection<StateData>(GetStates());
+    }
+
+    public ObservableCollection<StateData> States { get; set; }
+
+    private static List<StateData> GetStates()
+    {
+        return new List<StateData>
+        {
+            new("Alabama", "AL", "Montgomery"),
+            new("Alaska", "AK", "Juneau"),
+            new("Arizona", "AZ", "Phoenix"),
+            new("Arkansas", "AR", "Little Rock"),
+            new("California", "CA", "Sacramento"),
+            new("Colorado", "CO", "Denver"),
+            new("Connecticut", "CT", "Hartford"),
+            new("Delaware", "DE", "Dover"),
+            new("Florida", "FL", "Tallahassee"),
+            new("Georgia", "GA", "Atlanta"),
+            new("Hawaii", "HI", "Honolulu"),
+            new("Idaho", "ID", "Boise"),
+            new("Illinois", "IL", "Springfield"),
+            new("Indiana", "IN", "Indianapolis"),
+            new("Iowa", "IA", "Des Moines"),
+            new("Kansas", "KS", "Topeka"),
+            new("Kentucky", "KY", "Frankfort"),
+            new("Louisiana", "LA", "Baton Rouge"),
+            new("Maine", "ME", "Augusta"),
+            new("Maryland", "MD", "Annapolis"),
+            new("Massachusetts", "MA", "Boston"),
+            new("Michigan", "MI", "Lansing"),
+            new("Minnesota", "MN", "St. Paul"),
+            new("Mississippi", "MS", "Jackson"),
+            new("Missouri", "MO", "Jefferson City"),
+            new("Montana", "MT", "Helena"),
+            new("Nebraska", "NE", "Lincoln"),
+            new("Nevada", "NV", "Carson City"),
+            new("New Hampshire", "NH", "Concord"),
+            new("New Jersey", "NJ", "Trenton"),
+            new("New Mexico", "NM", "Santa Fe"),
+            new("New York", "NY", "Albany"),
+            new("North Carolina", "NC", "Raleigh"),
+            new("North Dakota", "ND", "Bismarck"),
+            new("Ohio", "OH", "Columbus"),
+            new("Oklahoma", "OK", "Oklahoma City"),
+            new("Oregon", "OR", "Salem"),
+            new("Pennsylvania", "PA", "Harrisburg"),
+            new("Rhode Island", "RI", "Providence"),
+            new("South Carolina", "SC", "Columbia"),
+            new("South Dakota", "SD", "Pierre"),
+            new("Tennessee", "TN", "Nashville"),
+            new("Texas", "TX", "Austin"),
+            new("Utah", "UT", "Salt Lake City"),
+            new("Vermont", "VT", "Montpelier"),
+            new("Virginia", "VA", "Richmond"),
+            new("Washington", "WA", "Olympia"),
+            new("West Virginia", "WV", "Charleston"),
+            new("Wisconsin", "WI", "Madison"),
+            new("Wyoming", "WY", "Cheyenne")
+        };
+    }
+}
+
+public class StateData
+{
+    public StateData(string name, string abbreviation, string capital)
+    {
+        Name = name;
+        Abbreviation = abbreviation;
+        Capital = capital;
+    }
+
+    public string Name { get; private set; }
+    public string Abbreviation { get; private set; }
+    public string Capital { get; private set; }
+}

demo/Ursa.Demo/ViewModels/MainViewViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using Avalonia.Controls;
 using CommunityToolkit.Mvvm.Messaging;
 
 namespace Ursa.Demo.ViewModels;
@@ -26,6 +27,7 @@ public class MainViewViewModel : ViewModelBase
         Content = s switch
         {
             MenuKeys.MenuKeyIntroduction => new IntroductionDemoViewModel(),
+            MenuKeys.MenuKeyAutoCompleteBox => new AutoCompleteBoxDemoViewModel(),
             MenuKeys.MenuKeyAvatar => new AvatarDemoViewModel(),
             MenuKeys.MenuKeyBadge => new BadgeDemoViewModel(),
             MenuKeys.MenuKeyBanner => new BannerDemoViewModel(),

demo/Ursa.Demo/ViewModels/MenuViewModel.cs

@@ -12,6 +12,7 @@ public class MenuViewModel: ViewModelBase
         {
             new() { MenuHeader = "Introduction", Key = MenuKeys.MenuKeyIntroduction, IsSeparator = false },
             new() { MenuHeader = "Controls", IsSeparator = true },
+            new() { MenuHeader = "AutoCompleteBox", Key = MenuKeys.MenuKeyAutoCompleteBox, Status = "WIP" },
             new() { MenuHeader = "Avatar", Key = MenuKeys.MenuKeyAvatar, Status = "WIP"},
             new() { MenuHeader = "Badge", Key = MenuKeys.MenuKeyBadge },
             new() { MenuHeader = "Banner", Key = MenuKeys.MenuKeyBanner },
@@ -61,6 +62,7 @@ public class MenuViewModel: ViewModelBase
 public static class MenuKeys
 {
     public const string MenuKeyIntroduction = "Introduction";
+    public const string MenuKeyAutoCompleteBox = "AutoCompleteBox";
     public const string MenuKeyAvatar = "Avatar";
     public const string MenuKeyBadge = "Badge";
     public const string MenuKeyBanner = "Banner";