[TUI] Add Image Help dialog with F1 shortcut for user assistance

Aaru.Tui/Aaru.Tui.csproj

@@ -26,6 +26,10 @@
     <Compile Update="Views\Dialogs\GoToSectorDialog.axaml.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Update="Views\Dialogs\ImageHelpDialog.axaml.cs">
+      <DependentUpon>ImageHelpDialog.axaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
   </ItemGroup>
 
   <ItemGroup>

Aaru.Tui/ViewModels/Dialogs/ImageHelpDialogViewModel.cs

@@ -0,0 +1,24 @@
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using Iciclecreek.Avalonia.WindowManager;
+
+namespace Aaru.Tui.ViewModels.Dialogs;
+
+public sealed class ImageHelpDialogViewModel : ViewModelBase
+{
+    internal ManagedWindow _dialog = null!;
+
+
+    public ImageHelpDialogViewModel(ManagedWindow dialog)
+    {
+        _dialog   = dialog;
+        OkCommand = new RelayCommand(Ok);
+    }
+
+    public ICommand OkCommand { get; }
+
+    void Ok()
+    {
+        _dialog.Close(true);
+    }
+}

Aaru.Tui/ViewModels/Windows/ImageWindowViewModel.cs

@@ -31,6 +31,8 @@ using System.Windows.Input;
 using Aaru.CommonTypes;
 using Aaru.CommonTypes.Interfaces;
 using Aaru.Tui.Models;
+using Aaru.Tui.ViewModels.Dialogs;
+using Aaru.Tui.Views.Dialogs;
 using Aaru.Tui.Views.Windows;
 using Avalonia;
 using Avalonia.Controls;
@@ -91,6 +93,7 @@ public sealed partial class ImageWindowViewModel : ViewModelBase
 
         ExitCommand       = new RelayCommand(Exit);
         BackCommand       = new RelayCommand(Back);
+        HelpCommand       = new AsyncRelayCommand(HelpAsync);
         SectorViewCommand = new RelayCommand(SectorView);
     }
 
@@ -146,6 +149,7 @@ public sealed partial class ImageWindowViewModel : ViewModelBase
     }
 
     public ICommand BackCommand       { get; }
+    public ICommand HelpCommand       { get; }
     public ICommand ExitCommand       { get; }
     public ICommand SectorViewCommand { get; }
 
@@ -178,6 +182,19 @@ public sealed partial class ImageWindowViewModel : ViewModelBase
         _ = Task.Run(Worker);
     }
 
+    Task HelpAsync()
+    {
+        var dialog = new ImageHelpDialog
+        {
+            DataContext = new ImageHelpDialogViewModel(null!)
+        };
+
+        // Set the dialog reference after creation
+        ((ImageHelpDialogViewModel)dialog.DataContext!)._dialog = dialog;
+
+        return dialog.ShowDialog(_view);
+    }
+
     void Worker()
     {
         IsStatusVisible = true;

Aaru.Tui/Views/Dialogs/ImageHelpDialog.axaml

@@ -0,0 +1,71 @@
+<windowManager:ManagedWindow xmlns="https://github.com/avaloniaui"
+                             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+                             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+                             xmlns:windowManager="clr-namespace:Iciclecreek.Avalonia.WindowManager;assembly=Iciclecreek.Avalonia.WindowManager"
+                             xmlns:dialogs="clr-namespace:Aaru.Tui.ViewModels.Dialogs"
+                             xmlns:brushes="https://github.com/jinek/consolonia"
+                             mc:Ignorable="d"
+                             d:DesignWidth="800"
+                             d:DesignHeight="450"
+                             x:Class="Aaru.Tui.Views.Dialogs.ImageHelpDialog"
+                             Width="40"
+                             Height="8"
+                             WindowStartupLocation="CenterScreen"
+                             BorderBrush="Blue"
+                             CanResize="False"
+                             Title="Help">
+    <Design.DataContext>
+        <dialogs:ImageHelpDialogViewModel />
+    </Design.DataContext>
+    <Border BorderThickness="1">
+        <Border.BorderBrush>
+            <brushes:LineBrush LineStyle="DoubleLine"
+                               Brush="Blue" />
+        </Border.BorderBrush>
+        <StackPanel>
+            <Grid ColumnDefinitions="Auto,*"
+                  ColumnSpacing="2">
+                <TextBlock Grid.Column="0"
+                           Foreground="Aqua"
+                           Text="ESC" />
+                <TextBlock Grid.Column="1"
+                           Foreground="SlateBlue"
+                           Text="Go back to previous window" />
+            </Grid>
+            <Grid ColumnDefinitions="Auto,*"
+                  ColumnSpacing="2">
+                <TextBlock Grid.Column="0"
+                           Foreground="Aqua"
+                           Text="F1 " />
+                <TextBlock Grid.Column="1"
+                           Foreground="SlateBlue"
+                           Text="Shows this help" />
+            </Grid>
+            <Grid ColumnDefinitions="Auto,*"
+                  ColumnSpacing="2">
+                <TextBlock Grid.Column="0"
+                           Foreground="Aqua"
+                           Text="F2 " />
+                <TextBlock Grid.Column="1"
+                           Foreground="SlateBlue"
+                           Text="Sector viewer" />
+            </Grid>
+            <Grid ColumnDefinitions="Auto,*"
+                  ColumnSpacing="2">
+                <TextBlock Grid.Column="0"
+                           Foreground="Aqua"
+                           Text="F10" />
+                <TextBlock Grid.Column="1"
+                           Foreground="SlateBlue"
+                           Text="Exits the application" />
+            </Grid>
+            <StackPanel Orientation="Horizontal"
+                        HorizontalAlignment="Right"
+                        Spacing="1">
+                <Button Content="OK"
+                        Command="{Binding OkCommand, Mode=OneWay}" />
+            </StackPanel>
+        </StackPanel>
+    </Border>
+</windowManager:ManagedWindow>

Aaru.Tui/Views/Dialogs/ImageHelpDialog.axaml.cs

@@ -0,0 +1,11 @@
+using Iciclecreek.Avalonia.WindowManager;
+
+namespace Aaru.Tui.Views.Dialogs;
+
+public partial class ImageHelpDialog : ManagedWindow
+{
+    public ImageHelpDialog()
+    {
+        InitializeComponent();
+    }
+}

Aaru.Tui/Views/Windows/ImageWindow.axaml

@@ -18,7 +18,9 @@
             <MenuItem Header="ESC Back"
                       Command="{Binding BackCommand, Mode=OneWay}"
                       HotKey="Escape" />
-            <MenuItem Header="F1  Help" />
+            <MenuItem Header="F1  Help"
+                      Command="{Binding HelpCommand, Mode=OneWay}"
+                      HotKey="F1" />
             <MenuItem Header="F2  ScVw"
                       Command="{Binding SectorViewCommand, Mode=OneWay}"
                       HotKey="F2" />