Fix Linux desktop title bar theming

v2rayN/v2rayN.Desktop/Views/MainWindow.axaml

@@ -8,6 +8,7 @@
     xmlns:resx="clr-namespace:ServiceLib.Resx;assembly=ServiceLib"
     xmlns:view="using:v2rayN.Desktop.Views"
     xmlns:vms="clr-namespace:ServiceLib.ViewModels;assembly=ServiceLib"
+    x:Name="mainWindow"
     Title="v2rayN"
     Width="1200"
     Height="800"
@@ -17,11 +18,84 @@
     ShowInTaskbar="True"
     WindowStartupLocation="CenterScreen"
     mc:Ignorable="d">
+    <Window.Styles>
+        <Style Selector="Border.windowTitleBar">
+            <Setter Property="Background" Value="Transparent" />
+            <Setter Property="BorderBrush" Value="{DynamicResource ButtonDefaultTertiaryForeground}" />
+            <Setter Property="BorderThickness" Value="0,0,0,1" />
+        </Style>
+        <Style Selector="Button.windowTitleBarButton">
+            <Setter Property="Width" Value="36" />
+            <Setter Property="Height" Value="32" />
+            <Setter Property="MinWidth" Value="36" />
+            <Setter Property="Padding" Value="0" />
+            <Setter Property="Theme" Value="{DynamicResource BorderlessButton}" />
+        </Style>
+        <Style Selector="TextBlock.windowTitleBarGlyph">
+            <Setter Property="FontSize" Value="14" />
+            <Setter Property="Foreground" Value="{DynamicResource ButtonDefaultTertiaryForeground}" />
+            <Setter Property="HorizontalAlignment" Value="Center" />
+            <Setter Property="VerticalAlignment" Value="Center" />
+        </Style>
+    </Window.Styles>
     <dialogHost:DialogHost
         Background="Gray"
         CloseOnClickAway="True"
         DisableOpeningAnimation="True">
-        <DockPanel>
+        <DockPanel LastChildFill="True">
+            <Border
+                x:Name="linuxTitleBar"
+                Classes="windowTitleBar"
+                DockPanel.Dock="Top"
+                IsVisible="False">
+                <Grid ColumnDefinitions="Auto,*,Auto" Height="36">
+                    <Border
+                        Grid.ColumnSpan="2"
+                        Background="Transparent"
+                        DoubleTapped="LinuxTitleBar_DoubleTapped"
+                        PointerPressed="LinuxTitleBar_PointerPressed" />
+                    <StackPanel
+                        Grid.Column="0"
+                        Margin="12,0,0,0"
+                        Orientation="Horizontal"
+                        Spacing="8">
+                        <Image
+                            Width="16"
+                            Height="16"
+                            Source="/Assets/NotifyIcon1.ico" />
+                        <TextBlock
+                            VerticalAlignment="Center"
+                            Text="{Binding Title, ElementName=mainWindow}" />
+                    </StackPanel>
+
+                    <StackPanel
+                        Grid.Column="2"
+                        Orientation="Horizontal">
+                        <Button
+                            x:Name="btnLinuxMinimize"
+                            Classes="windowTitleBarButton"
+                            Click="BtnLinuxMinimize_Click">
+                            <TextBlock Classes="windowTitleBarGlyph" Text="-" />
+                        </Button>
+                        <Button
+                            x:Name="btnLinuxMaximizeRestore"
+                            Classes="windowTitleBarButton"
+                            Click="BtnLinuxMaximizeRestore_Click">
+                            <TextBlock
+                                x:Name="txtLinuxMaximizeRestore"
+                                Classes="windowTitleBarGlyph"
+                                Text="□" />
+                        </Button>
+                        <Button
+                            x:Name="btnLinuxClose"
+                            Classes="windowTitleBarButton"
+                            Click="BtnLinuxClose_Click">
+                            <TextBlock Classes="windowTitleBarGlyph" Text="×" />
+                        </Button>
+                    </StackPanel>
+                </Grid>
+            </Border>
+
             <DockPanel Margin="{StaticResource Margin8}" DockPanel.Dock="Top">
                 <ContentControl x:Name="conTheme" DockPanel.Dock="Right" />
                 <Menu Margin="{StaticResource Margin4}">

v2rayN/v2rayN.Desktop/Views/MainWindow.axaml.cs

@@ -10,6 +10,7 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
 {
     private static Config _config;
     private readonly WindowNotificationManager? _manager;
+    private IDisposable? _linuxWindowStateSubscription;
     private CheckUpdateView? _checkUpdateView;
     private BackupAndRestoreView? _backupAndRestoreView;
     private bool _blCloseByUser = false;
@@ -162,6 +163,7 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         else
         {
             Title = $"{Utils.GetVersion()}";
+            ConfigureLinuxTitleBar();
         }
         menuAddServerViaScan.IsVisible = false;
 
@@ -388,6 +390,81 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         await AppManager.Instance.AppExitAsync(true);
     }
 
+    private void ConfigureLinuxTitleBar()
+    {
+        if (!Utils.IsLinux())
+        {
+            return;
+        }
+
+        linuxTitleBar.IsVisible = true;
+        SystemDecorations = SystemDecorations.BorderOnly;
+        btnLinuxMaximizeRestore.IsVisible = CanResize;
+
+        _linuxWindowStateSubscription = this
+            .GetObservable(WindowStateProperty)
+            .Subscribe(_ => UpdateLinuxTitleBarWindowState());
+        UpdateLinuxTitleBarWindowState();
+    }
+
+    private void UpdateLinuxTitleBarWindowState()
+    {
+        txtLinuxMaximizeRestore.Text = WindowState == WindowState.Maximized ? "❐" : "□";
+    }
+
+    private void LinuxTitleBar_PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (!Utils.IsLinux() || e.GetCurrentPoint(this).Properties.IsLeftButtonPressed == false)
+        {
+            return;
+        }
+
+        BeginMoveDrag(e);
+    }
+
+    private void LinuxTitleBar_DoubleTapped(object? sender, TappedEventArgs e)
+    {
+        if (!Utils.IsLinux() || !CanResize)
+        {
+            return;
+        }
+
+        ToggleLinuxWindowState();
+    }
+
+    private void BtnLinuxMinimize_Click(object? sender, RoutedEventArgs e)
+    {
+        WindowState = WindowState.Minimized;
+    }
+
+    private void BtnLinuxMaximizeRestore_Click(object? sender, RoutedEventArgs e)
+    {
+        ToggleLinuxWindowState();
+    }
+
+    private void BtnLinuxClose_Click(object? sender, RoutedEventArgs e)
+    {
+        HideToTray();
+    }
+
+    private void ToggleLinuxWindowState()
+    {
+        WindowState = WindowState == WindowState.Maximized
+            ? WindowState.Normal
+            : WindowState.Maximized;
+    }
+
+    private void HideToTray()
+    {
+        foreach (var ownedWindow in OwnedWindows)
+        {
+            ownedWindow.Close();
+        }
+
+        Hide();
+        AppManager.Instance.ShowInTaskbar = false;
+    }
+
     private void Shutdown(bool obj)
     {
         if (obj is bool b && _blCloseByUser == false)
@@ -450,6 +527,12 @@ public partial class MainWindow : WindowBase<MainWindowViewModel>
         RestoreUI();
     }
 
+    protected override void OnClosed(EventArgs e)
+    {
+        _linuxWindowStateSubscription?.Dispose();
+        base.OnClosed(e);
+    }
+
     private void RestoreUI()
     {
         if (_config.UiItem.MainGirdHeight1 > 0 && _config.UiItem.MainGirdHeight2 > 0)