Avalonia Theme Manager

About

Theme manager for Avalonia applications.

Usage

Theme manager searches user provided themes directory for *.xaml theme files otherwise built-in Light and Dark theme are used.

The ThemeSelector is created and initalized by calling static Create method.

The ThemeSelector uses Styles[0] property of Window to insert selected theme Style.

App.xaml XAML <Application x:Class="AvaloniaApp.App" xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Application.Styles> <StyleInclude Source="avares://Avalonia.Themes.Default/DefaultTheme.xaml"/> <StyleInclude Source="avares://Avalonia.Themes.Default/Accents/BaseLight.xaml"/> </Application.Styles> </Application>

App.xaml.cs ```C# using System; using Avalonia; using Avalonia.Logging.Serilog; using Avalonia.Markup.Xaml; using Avalonia.ThemeManager;

namespace AvaloniaApp { public class App : Application { public static ThemeSelector Selector;

    [STAThread]
    static void Main(string[] args)
    {
        BuildAvaloniaApp().Start(AppMain, args);
    }

    static void AppMain(Application app, string[] args)
    {
        Selector = ThemeSelector.Create("Themes");
        Selector.LoadSelectedTheme("AvaloniaApp.theme");

        app.Run(new MainWindow());

        Selector.SaveSelectedTheme("AvaloniaApp.theme");
    }

    public static AppBuilder BuildAvaloniaApp()
        => AppBuilder.Configure<App>()
                     .UsePlatformDetect()
                     .UseReactiveUI()
                     .LogToDebug();

    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
    }
}

} ```

MainWindow.xaml XAML <Window x:Class="AvaloniaApp.MainWindow" xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:app="clr-namespace:AvaloniaApp;assembly=AvaloniaApp" xmlns:manager="clr-namespace:Avalonia.ThemeManager;assembly=Avalonia.ThemeManager" Title="AvaloniaApp" Width="800" Height="600" Foreground="{DynamicResource ThemeForegroundBrush}"> <Window.Resources> <manager:ObjectEqualityMultiConverter x:Key="ObjectEqualityMultiConverter"/> </Window.Resources> <Grid RowDefinitions="Auto,*"> <Menu Grid.Row="0"> <MenuItem Header="_View"> <MenuItem Header="_Theme" DataContext="{x:Static app:App.Selector}" Items="{Binding Themes}"> <MenuItem.Styles> <Style Selector="MenuItem"> <Setter Property="Header" Value="{Binding Name}"/> <Setter Property="Command" Value="{Binding Selector.ApplyTheme}"/> <Setter Property="CommandParameter" Value="{Binding}"/> <Setter Property="Icon"> <Template> <CheckBox> <CheckBox.IsChecked> <MultiBinding Mode="OneWay" Converter="{StaticResource ObjectEqualityMultiConverter}"> <Binding Path="DataContext" RelativeSource="{RelativeSource Self}"/> <Binding Path="Selector.SelectedTheme"/> </MultiBinding> </CheckBox.IsChecked> </CheckBox> </Template> </Setter> </Style> </MenuItem.Styles> </MenuItem> </MenuItem> </Menu> </Grid> </Window>

MainWindow.xaml.xs ```C# using Avalonia; using Avalonia.Controls; using Avalonia.Markup.Xaml; using Avalonia.ThemeManager;

namespace AvaloniaApp { public partial class MainWindow : Window { public MainWindow() { this.InitializeComponent(); this.AttachDevTools(); App.Selector.EnableThemes(this); }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
    }
}

} ```

The EnableThemes(...); can be used to enable themes for multiple windows.

NuGet

Avalonia theme manager is delivered as a NuGet package.

You can find the packages here NuGet and install the package like this:

Install-Package Avalonia.ThemeManager

or by using nightly build feed: * Add https://www.myget.org/F/avaloniathememanager-nightly/api/v2 to your package sources * Alternative nightly build feed https://pkgs.dev.azure.com/wieslawsoltes/GitHub/_packaging/Nightly/nuget/v3/index.json * Update your package using Avalonia.ThemeManager feed

and install the package like this:

Install-Package Avalonia.ThemeManager -Pre

License

Avalonia.ThemeManager is licensed under the MIT license.