feat: add splash window.

demo/Sandbox/App.axaml.cs

@@ -1,4 +1,5 @@
 using Avalonia;
+using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Data.Core.Plugins;
 using Avalonia.Markup.Xaml;
@@ -21,10 +22,7 @@ public partial class App : Application
             // Line below is needed to remove Avalonia data validation.
             // Without this line you will get duplicate validations from both Avalonia and CT
             BindingPlugins.DataValidators.RemoveAt(0);
-            desktop.MainWindow = new MainWindow
-            {
-                DataContext = new MainWindowViewModel(),
-            };
+            desktop.MainWindow = new MainSplashWindow();
         }
 
         base.OnFrameworkInitializationCompleted();

demo/Sandbox/Views/MainSplashWindow.axaml

@@ -0,0 +1,12 @@
+<u:SplashWindow 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:u="https://irihi.tech/ursa"
+        mc:Ignorable="d" d:DesignWidth="800"
+        d:DesignHeight="450"
+        CountDown="0:0:2"
+        x:Class="Sandbox.Views.MainSplashWindow"
+        Title="MainSplashWindow">
+    Welcome to Avalonia Splash Window!
+</u:SplashWindow>

demo/Sandbox/Views/MainSplashWindow.axaml.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Threading.Tasks;
+using System.Timers;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using Sandbox.ViewModels;
+using Ursa.Controls;
+
+namespace Sandbox.Views;
+
+public partial class MainSplashWindow : SplashWindow
+{
+    public MainSplashWindow()
+    {
+        InitializeComponent();
+    }
+    
+    protected override async Task<Window> CreateNextWindow()
+    {
+        return new MainWindow()
+        {
+            DataContext = new MainWindowViewModel()
+        };
+    }
+}

demo/Ursa.Demo/App.axaml.cs

@@ -18,10 +18,7 @@ public partial class App : Application
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            desktop.MainWindow = new MainWindow()
-            {
-                DataContext = new MainViewViewModel(),
-            };
+            desktop.MainWindow = new MainSplashWindow();
         }
         else if (ApplicationLifetime is ISingleViewApplicationLifetime singleView)
         {

demo/Ursa.Demo/Views/MainSplashWindow.axaml

@@ -0,0 +1,54 @@
+<u:SplashWindow
+    x:Class="Ursa.Demo.Views.MainSplashWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:iri="https://irihi.tech/shared"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:u="https://irihi.tech/ursa"
+    Title="MainSplashWindow"
+    Width="400"
+    Height="400"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    CountDown="0:0:3"
+    ExtendClientAreaChromeHints="NoChrome"
+    ExtendClientAreaTitleBarHeightHint="0"
+    ExtendClientAreaToDecorationsHint="True"
+    SystemDecorations="None"
+    WindowStartupLocation="CenterScreen"
+    mc:Ignorable="d">
+    <Grid
+        HorizontalAlignment="Center"
+        VerticalAlignment="Center"
+        ColumnDefinitions="Auto, Auto"
+        RowDefinitions="Auto, Auto">
+        <iri:IrihiLogo
+            Grid.Row="0"
+            Grid.Column="0"
+            Width="64"
+            Margin="0,0,16,0"
+            Fill="{DynamicResource SemiGrey5}" />
+        <StackPanel Grid.Row="0" Grid.Column="1">
+            <TextBlock
+                Classes="H2"
+                Text="铱泓科技"
+                Theme="{DynamicResource TitleTextBlock}" />
+            <TextBlock FontWeight="Bold" Text="IRIHI Technology" />
+        </StackPanel>
+        <StackPanel
+            Grid.Row="1"
+            Grid.Column="0"
+            Grid.ColumnSpan="2">
+            <TextBlock
+                Margin="0,12,0,0"
+                HorizontalAlignment="Center"
+                FontSize="14"
+                Text="聚焦生产力的美学进化" />
+            <TextBlock
+                HorizontalAlignment="Center"
+                FontSize="14"
+                Text="Aesthetic Evolution of Productivity" />
+        </StackPanel>
+    </Grid>
+</u:SplashWindow>

demo/Ursa.Demo/Views/MainSplashWindow.axaml.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Ursa.Controls;
+using Ursa.Demo.ViewModels;
+
+namespace Ursa.Demo.Views;
+
+public partial class MainSplashWindow : SplashWindow
+{
+    public MainSplashWindow()
+    {
+        InitializeComponent();
+    }
+
+    protected override async Task<Window> CreateNextWindow()
+    {
+        return new MainWindow()
+        {
+            DataContext = new MainViewViewModel()
+        };
+    }
+}

demo/Ursa.Demo/Views/MainWindow.axaml

@@ -13,6 +13,7 @@
     d:DesignWidth="800"
     x:CompileBindings="True"
     x:DataType="viewModels:MainWindowViewModel"
+    WindowStartupLocation="CenterScreen"
     Icon="/Assets/Ursa.ico"
     IsFullScreenButtonVisible="{OnPlatform True, macOS=False}"
     IsManagedResizerVisible="{OnPlatform False, Linux=True}"

src/Ursa/Windows/SplashWindow.cs

@@ -0,0 +1,56 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+
+namespace Ursa.Controls;
+
+public abstract class SplashWindow: Window
+{
+    public static readonly StyledProperty<TimeSpan?> CountDownProperty = AvaloniaProperty.Register<SplashWindow, TimeSpan?>(
+        nameof(CountDown));
+
+    public TimeSpan? CountDown
+    {
+        get => GetValue(CountDownProperty);
+        set => SetValue(CountDownProperty, value);
+    }
+
+    protected override void OnLoaded(RoutedEventArgs e)
+    {
+        base.OnLoaded(e);
+        if (CountDown != null && CountDown != TimeSpan.Zero)
+        {
+            DispatcherTimer.RunOnce(Close, CountDown.Value);
+        }
+    }
+
+    protected virtual Task<bool> CanClose() => Task.FromResult(true);
+    protected abstract Task<Window> CreateNextWindow();
+    
+    private bool _canClose;
+    
+    protected override sealed async void OnClosing(WindowClosingEventArgs e)
+    {
+        VerifyAccess();
+        if (!_canClose)
+        {
+            e.Cancel = true;
+            _canClose = await CanClose();
+            if (_canClose)
+            {
+                var nextWindow = await CreateNextWindow();
+                if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime lifetime)
+                {
+                    lifetime.MainWindow = nextWindow;
+                }
+                nextWindow.Show();
+                Close();
+                return;
+            }
+        }
+        base.OnClosing(e);
+        
+    }
+}