[TUI] Migrate to Prism.Avalonia.

Aaru.Tui/ViewModels/ViewModelBase.cs

@@ -29,4 +29,30 @@ using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Aaru.Tui.ViewModels;
 
-public class ViewModelBase : ObservableObject;
+public class ViewModelBase : ObservableObject, IRegionAware
+{
+    /// <summary>
+    ///     Called to determine if this instance can handle the navigation request.
+    ///     Don't call this directly, use <seealso cref="OnNavigatingTo(NavigationContext)" />.
+    /// </summary>
+    /// <param name="navigationContext">The navigation context.</param>
+    /// <returns><see langword="true" /> if this instance accepts the navigation request; otherwise, <see langword="false" />.</returns>
+    public virtual bool IsNavigationTarget(NavigationContext navigationContext) =>
+
+        // Auto-allow navigation
+        OnNavigatingTo(navigationContext);
+
+    /// <summary>Called when the implementer is being navigated away from.</summary>
+    /// <param name="navigationContext">The navigation context.</param>
+    public virtual void OnNavigatedFrom(NavigationContext navigationContext) {}
+
+    /// <summary>Called when the implementer has been navigated to.</summary>
+    /// <param name="navigationContext">The navigation context.</param>
+    public virtual void OnNavigatedTo(NavigationContext navigationContext) {}
+
+    /// <summary>Navigation validation checker.</summary>
+    /// <remarks>Override for Prism 7.2's IsNavigationTarget.</remarks>
+    /// <param name="navigationContext">The navigation context.</param>
+    /// <returns><see langword="true" /> if this instance accepts the navigation request; otherwise, <see langword="false" />.</returns>
+    public virtual bool OnNavigatingTo(NavigationContext navigationContext) => true;
+}