Some shell/ themes improvements

Wino.Mail.WinUI/AppShell.xaml

@@ -356,22 +356,9 @@
     <Grid
         x:Name="RootGrid"
         Padding="0"
+        Background="{ThemeResource WinoApplicationBackgroundColor}"
         ColumnSpacing="0"
         RowSpacing="0">
-        <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="48" />
-            <ColumnDefinition Width="*" />
-        </Grid.ColumnDefinitions>
-        <Grid.RowDefinitions>
-            <RowDefinition Height="48" />
-            <RowDefinition Height="*" />
-        </Grid.RowDefinitions>
-
-        <Grid
-            Grid.RowSpan="2"
-            Grid.ColumnSpan="2"
-            Background="{ThemeResource WinoApplicationBackgroundColor}"
-            IsHitTestVisible="False" />
 
         <muxc:NavigationView
             x:Name="navigationView"
@@ -452,21 +439,5 @@
             </Grid>
         </muxc:NavigationView>
 
-        <!--<coreControls:WinoAppTitleBar
-            x:Name="RealAppBar"
-            Grid.ColumnSpan="2"
-            BackButtonClicked="BackButtonClicked"
-            Canvas.ZIndex="150"
-            ConnectionStatus="{x:Bind ViewModel.ActiveConnectionStatus, Mode=OneWay}"
-            CoreWindowText="{x:Bind ViewModel.StatePersistenceService.CoreWindowTitle, Mode=OneWay}"
-            IsBackButtonVisible="{x:Bind ViewModel.StatePersistenceService.IsBackButtonVisible, Mode=OneWay}"
-            IsDragArea="True"
-            IsNavigationPaneOpen="{x:Bind navigationView.IsPaneOpen, Mode=TwoWay}"
-            IsReaderNarrowed="{x:Bind ViewModel.StatePersistenceService.IsReaderNarrowed, Mode=OneWay}"
-            NavigationViewDisplayMode="{x:Bind navigationView.DisplayMode, Mode=OneWay}"
-            OpenPaneLength="{x:Bind ViewModel.StatePersistenceService.OpenPaneLength, Mode=OneWay}"
-            ReadingPaneLength="{x:Bind ViewModel.StatePersistenceService.MailListPaneLength, Mode=OneWay}"
-            ReconnectCommand="{x:Bind ViewModel.ReconnectServerCommand}"
-            SystemReserved="180" />-->
     </Grid>
 </abstract:AppShellAbstract>

Wino.Mail.WinUI/AppShell.xaml.cs

@@ -130,7 +130,7 @@ public sealed partial class AppShell : AppShellAbstract,
 
     public async void Receive(AccountMenuItemExtended message)
     {
-        await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async () =>
+        await DispatcherQueue.EnqueueAsync(async () =>
         {
             if (message.FolderId == default) return;
 

Wino.Mail.WinUI/ShellWindow.xaml

@@ -11,6 +11,7 @@
     mc:Ignorable="d">
 
     <winuiex:WindowEx.SystemBackdrop>
+        <!--  TODO: Reach to ThemeService changes.  -->
         <MicaBackdrop />
     </winuiex:WindowEx.SystemBackdrop>
 
@@ -20,8 +21,17 @@
             <RowDefinition Height="*" />
         </Grid.RowDefinitions>
 
-        <TitleBar x:Name="ShellTitleBar" IsBackButtonVisible="True" />
+        <TitleBar
+            x:Name="ShellTitleBar"
+            Title="{x:Bind StatePersistanceService.CoreWindowTitle, Mode=OneWay}"
+            BackRequested="BackButtonClicked"
+            IsBackButtonVisible="{x:Bind StatePersistanceService.IsBackButtonVisible, Mode=OneWay}"
+            IsPaneToggleButtonVisible="True"
+            PaneToggleRequested="PaneButtonClicked" />
 
-        <Frame x:Name="MainShellFrame" Grid.Row="1" />
+        <Frame
+            x:Name="MainShellFrame"
+            Grid.Row="1"
+            Navigated="MainFrameNavigated" />
     </Grid>
 </winuiex:WindowEx>

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;
+    }
 }