themeSelectorService.md

Services

ThemeSelectorService

Notes

This Class is based on the ThemeSelectorService from the Windows Template Studio, but with some changes to make it work with the ThemeTitleBarService from the UWP Toolkit. You can delete the ThemeSelectorService from the Windows Template Studio if you use the ThemeTitleBarService from the UWP Toolkit in your project.

Or you can also use ThemeTitleBarService inside your ThemeSelectorService from the Windows Template Studio. Example:

• Put private static ThemeTitleBarService themeTitleBar; on top of the SettingsKey const.
• Add themeTitleBar = new ThemeTitleBarService(); and themeTitleBar.SetTheme(); in the InitializeAsync method.

public static async Task InitializeAsync()
{
    Theme = await LoadThemeFromSettingsAsync();
    themeTitleBar = new ThemeTitleBarService();
    //Theme Default
    themeTitleBar.SetTheme();
}

• Add themeTitleBar.SetTheme(); in the SetRequestedThemeAsync method.

public static async Task SetRequestedThemeAsync()
{
	foreach (var view in CoreApplication.Views)
	{
		await view.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
		{
			if (Window.Current.Content is FrameworkElement frameworkElement)
			{
				frameworkElement.RequestedTheme = Theme;
				// Change Theme manually
				themeTitleBar.SetTheme();
			}
		});
	}
}

• Add ThemeTitleBarService.CurrentWindow = Window.Current; in the App Method.

// App.xaml.cs
public App()
{
    InitializeComponent();
    // <...>
    // Deferred execution until used. Check https://docs.microsoft.com/dotnet/api/system.lazy-1 for further info on Lazy<T> class.
	_activationService = new Lazy<ActivationService>(CreateActivationService);

    ThemeTitleBarService.CurrentWindow = Window.Current;
}

InitializeAsync

Initialize ThemeSelectorService, loading saved theme from settings and Initialize ThemeTitleBarService.

SetThemeAsync

Sets the application theme, updates the user interface and saves the theme in the application settings.

SetRequestedThemeAsync

Configures the requested theme in all application views, updating the user interface and the theme title bar.