Some shell/ themes improvements

Wino.Mail.WinUI/ShellWindow.xaml.cs

@@ -1,6 +1,12 @@
+using System;
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.WinUI;
 using Wino.Core.WinUI.Interfaces;
+using Wino.Messaging.Client.Mails;
 using Wino.Views;
 using WinUIEx;
 
@@ -8,10 +14,15 @@ namespace Wino.Mail.WinUI;
 
 public sealed partial class ShellWindow : WindowEx, IWinoShellWindow
 {
+    public IStatePersistanceService StatePersistanceService { get; } = WinoApplication.Current.Services.GetService<IStatePersistanceService>() ?? throw new Exception("StatePersistanceService not registered in DI container.");
+    public IPreferencesService PreferencesService { get; } = WinoApplication.Current.Services.GetService<IPreferencesService>() ?? throw new Exception("PreferencesService not registered in DI container.");
+
     public ShellWindow()
     {
         InitializeComponent();
 
+        MinWidth = 420;
+        MinHeight = 420;
         ConfigureTitleBar();
     }
 
@@ -30,4 +41,19 @@ public sealed partial class ShellWindow : WindowEx, IWinoShellWindow
     public Microsoft.UI.Xaml.Controls.TitleBar GetTitleBar() => ShellTitleBar;
 
     public Frame GetMainFrame() => MainShellFrame;
+
+    public FrameworkElement GetRootContent() => Content as Grid ?? throw new Exception("RootContent is not a Grid or empty.");
+
+    private void BackButtonClicked(Microsoft.UI.Xaml.Controls.TitleBar sender, object args)
+    {
+        WeakReferenceMessenger.Default.Send(new ClearMailSelectionsRequested());
+        WeakReferenceMessenger.Default.Send(new DisposeRenderingFrameRequested());
+    }
+
+    private void MainFrameNavigated(object sender, Microsoft.UI.Xaml.Navigation.NavigationEventArgs e) => ShellTitleBar.Content = (e.Content as BasePage).ShellContent;
+
+    private void PaneButtonClicked(Microsoft.UI.Xaml.Controls.TitleBar sender, object args)
+    {
+        PreferencesService.IsNavigationPaneOpened = !PreferencesService.IsNavigationPaneOpened;
+    }
 }