Add "Show desktop" button

RetroBar/Controls/ShowDesktopButton.xaml

@@ -0,0 +1,31 @@
+<UserControl x:Class="RetroBar.Controls.ShowDesktopButton"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:Settings="clr-namespace:RetroBar.Utilities"
+             Loaded="UserControl_Loaded"
+             Unloaded="UserControl_Unloaded">
+    <ToggleButton Name="ShowDesktop"
+                  ToolTip="{DynamicResource ShowDesktopButtonTip}"
+                  Style="{DynamicResource ShowDesktopButton}"
+                  Click="ShowDesktop_OnClick"
+                  MouseEnter="ShowDesktop_OnMouseEnter"
+                  MouseLeave="ShowDesktop_OnMouseLeave">
+        <Image Name="ShowDesktopIcon"
+               Style="{DynamicResource ShowDesktopIcon}" />
+        <ToggleButton.ContextMenu>
+            <ContextMenu Opened="ContextMenu_Opened">
+                <MenuItem Style="{DynamicResource ShowDesktopItem}"
+                        Name="ShowDesktopItem"
+                        Click="ShowDesktop_OnClick" />
+                <MenuItem Header="{DynamicResource peek_at_desktop}"
+                        IsCheckable="True"
+                        IsChecked="{Binding Source={x:Static Settings:Settings.Instance}, Path=PeekAtDesktop, UpdateSourceTrigger=PropertyChanged}"
+                        Name="PeekAtDesktopItem" />
+                <MenuItem Header="{DynamicResource tray_properties}"
+                        Name="PropertiesItem"
+                        Click="PropertiesItem_OnClick" />
+            </ContextMenu>
+        </ToggleButton.ContextMenu>
+    </ToggleButton>
+</UserControl>
+

RetroBar/Controls/ShowDesktopButton.xaml.cs

@@ -0,0 +1,132 @@
+using ManagedShell.Common.Helpers;
+using ManagedShell.Interop;
+using ManagedShell.WindowsTasks;
+using RetroBar.Utilities;
+using System;
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace RetroBar.Controls
+{
+    /// <summary>
+    /// Interaction logic for ShowDesktopButton.xaml
+    /// </summary>
+    public partial class ShowDesktopButton : UserControl
+    {
+        private const int TOGGLE_DESKTOP = 407;
+        private IntPtr taskbarHandle = Process.GetCurrentProcess().MainWindowHandle;
+        private bool isWindows81OrBetter = EnvironmentHelper.IsWindows81OrBetter;
+        private bool isLoaded;
+
+        public static DependencyProperty TasksServiceProperty = DependencyProperty.Register("TasksService", typeof(TasksService), typeof(ShowDesktopButton));
+
+        public TasksService TasksService
+        {
+            get { return (TasksService)GetValue(TasksServiceProperty); }
+            set { SetValue(TasksServiceProperty, value); }
+        }
+
+        public ShowDesktopButton()
+        {
+            InitializeComponent();
+        }
+
+        private void SetIconSizeForDpi()
+        {
+            if (DpiHelper.DpiScale > 1)
+            {
+                ShowDesktopIcon.Source = (System.Windows.Media.ImageSource)FindResource("ShowDesktopIconImageLarge");
+            }
+            else
+            {
+                ShowDesktopIcon.Source = (System.Windows.Media.ImageSource)FindResource("ShowDesktopIconImageSmall");
+            }
+        }
+
+        private void ContextMenu_Opened(object sender, RoutedEventArgs e)
+        {
+            PeekAtDesktopItem.IsEnabled = true;
+            if (!NativeMethods.DwmIsCompositionEnabled())
+            {
+                PeekAtDesktopItem.IsEnabled = false;
+            }
+        }
+
+        private void ToggleDesktop()
+        {
+            NativeMethods.SendMessage(WindowHelper.FindWindowsTray(IntPtr.Zero),
+                (int)NativeMethods.WM.COMMAND, (IntPtr)TOGGLE_DESKTOP, IntPtr.Zero);
+        }
+
+        private void PeekAtDesktop(uint shouldPeek)
+        {
+            if (Settings.Instance.PeekAtDesktop && NativeMethods.DwmIsCompositionEnabled())
+            {
+                if (isWindows81OrBetter)
+                {
+                    NativeMethods.DwmActivateLivePreview(shouldPeek, taskbarHandle,
+                        IntPtr.Zero, NativeMethods.AeroPeekType.Desktop, IntPtr.Zero);
+                }
+                else
+                {
+                    NativeMethods.DwmActivateLivePreview(shouldPeek, taskbarHandle,
+                        IntPtr.Zero, NativeMethods.AeroPeekType.Desktop);
+                }
+            }
+        }
+
+        private void ShowDesktop_OnMouseEnter(object sender, RoutedEventArgs e)
+        {
+            PeekAtDesktop(1);
+        }
+
+        private void ShowDesktop_OnMouseLeave(object sender, RoutedEventArgs e)
+        {
+            PeekAtDesktop(0);
+        }
+
+        private void ShowDesktop_OnClick(object sender, RoutedEventArgs e)
+        {
+            // If the user activates a window other than the desktop, HandleWindowActivated will deselect the button.
+            ToggleDesktop();
+        }
+
+        private void OpenDisplayPropertiesCpl()
+        {
+            ShellHelper.StartProcess("desk.cpl");
+        }
+
+        private void PropertiesItem_OnClick(object sender, RoutedEventArgs e)
+        {
+            OpenDisplayPropertiesCpl();
+        }
+
+        private void HandleWindowActivated(object sender, WindowActivatedEventArgs e)
+        {
+            if (ShowDesktop.IsChecked == true)
+            {
+                ShowDesktop.IsChecked = false;
+            }
+        }
+
+        private void UserControl_Loaded(object sender, RoutedEventArgs e)
+        {
+            if (!isLoaded && TasksService != null)
+            {
+                SetIconSizeForDpi();
+                TasksService.WindowActivated += HandleWindowActivated;
+                isLoaded = true;
+            }
+        }
+
+        private void UserControl_Unloaded(object sender, RoutedEventArgs e)
+        {
+            if (isLoaded && TasksService != null)
+            {
+                TasksService.WindowActivated -= HandleWindowActivated;
+                isLoaded = false;
+            }
+        }
+    }
+}

RetroBar/Languages/English.xaml

@@ -31,6 +31,7 @@
     <s:String x:Key="show_window_previews">Show _window previews (thumbnails)</s:String>
     <s:String x:Key="use_software_rendering">_Use software rendering</s:String>
     <s:String x:Key="middle_mouse_to_close">_Middle-click to close taskbar items</s:String>
+    <s:String x:Key="add_show_desktop_button">Add the Show _Desktop button</s:String>
     <s:String x:Key="multiple_displays">Multiple displays</s:String>
     <s:String x:Key="show_tasks_on">S_how tasks on:</s:String>
     <x:Array x:Key="show_tasks_on_values" Type="s:String">
@@ -76,6 +77,12 @@
     <s:String x:Key="exit_retrobar">_Exit RetroBar</s:String>
     <s:String x:Key="customize_notifications_menu">_Customize Notifications...</s:String>
 
+    <s:String x:Key="show_desktop_tip_95">Surface/Restore Desktop</s:String>
+    <s:String x:Key="show_desktop_tip">Show Desktop</s:String>
+    <s:String x:Key="show_desktop_95">_Desktop</s:String>
+    <s:String x:Key="show_desktop">_Show Desktop</s:String>
+    <s:String x:Key="peek_at_desktop">_Peek at desktop</s:String>
+
     <s:String x:Key="restore">_Restore</s:String>
     <s:String x:Key="move">_Move</s:String>
     <s:String x:Key="size">_Size</s:String>

RetroBar/Languages/español.xaml

@@ -31,6 +31,7 @@
     <s:String x:Key="show_window_previews">Mostrar _vistas previas de las ventanas (miniaturas)</s:String>
     <s:String x:Key="use_software_rendering">Usar procesamiento por soft_ware</s:String>
     <s:String x:Key="middle_mouse_to_close">_Cerrar elementos de la barra de tareas con el botón central</s:String>
+    <s:String x:Key="add_show_desktop_button">Agregar el botón Mostrar _escritorio</s:String>
     <s:String x:Key="multiple_displays">Varias pantallas</s:String>
     <s:String x:Key="show_tasks_on">Mostrar _tareas en:</s:String>
     <x:Array x:Key="show_tasks_on_values" Type="s:String">
@@ -76,6 +77,12 @@
     <s:String x:Key="exit_retrobar">_Salir de RetroBar</s:String>
     <s:String x:Key="customize_notifications_menu">Personali_zar notificaciones...</s:String>
 
+    <s:String x:Key="show_desktop_tip_95">Emerger o restaurar escritorio</s:String>
+    <s:String x:Key="show_desktop_tip">Mostrar escritorio</s:String>
+    <s:String x:Key="show_desktop_95">_Escritorio</s:String>
+    <s:String x:Key="show_desktop">_Mostrar escritorio</s:String>
+    <s:String x:Key="peek_at_desktop">_Vistazo al escritorio</s:String>
+
     <s:String x:Key="restore">_Restaurar</s:String>
     <s:String x:Key="move">_Mover</s:String>
     <s:String x:Key="size">_Tamaño</s:String>

RetroBar/Properties/Settings.settings

@@ -35,10 +35,15 @@
     <Setting Name="UseSoftwareRendering" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">False</Value>
     </Setting>
-	<Setting Name="MiddleMouseToClose" Type="System.Boolean" Scope="User">
+    <Setting Name="MiddleMouseToClose" Type="System.Boolean" Scope="User">
+      <Value Profile="(Default)">False</Value>
+    </Setting>
+    <Setting Name="ShowDesktopButton" Type="System.Boolean" Scope="User">
+      <Value Profile="(Default)">False</Value>
+    </Setting>
+    <Setting Name="PeekAtDesktop" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">False</Value>
     </Setting>
-
     <Setting Name="PinnedNotifyIcons" Type="System.String" Scope="User">
       <Value Profile="(Default)">7820ae76-23e3-4229-82c1-e41cb67d5b9c|7820ae75-23e3-4229-82c1-e41cb67d5b9c|7820ae74-23e3-4229-82c1-e41cb67d5b9c|7820ae73-23e3-4229-82c1-e41cb67d5b9c</Value>
     </Setting>

RetroBar/PropertiesWindow.xaml

@@ -220,6 +220,7 @@
                                                  Converter="{StaticResource textRenderingModeConverter}" />
                                     </TextOptions.TextRenderingMode>
                                     <DockPanel>
+                                        <controls:ShowDesktopButton DockPanel.Dock="Right" HorizontalAlignment="Center" Visibility="{Binding Source={x:Static Settings:Settings.Instance}, Path=ShowDesktopButton, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource boolToVisibilityConverter}}" />
                                         <GroupBox Style="{DynamicResource Tray}"
                                                   DockPanel.Dock="Right">
                                             <StackPanel Orientation="Horizontal">
@@ -253,6 +254,10 @@
                                       IsChecked="{Binding Source={x:Static Settings:Settings.Instance}, Path=ShowClock, UpdateSourceTrigger=PropertyChanged}">
                                 <Label Content="{DynamicResource show_clock}" />
                             </CheckBox>
+                            <CheckBox x:Name="cbShowDesktopButton"
+                                      IsChecked="{Binding Source={x:Static Settings:Settings.Instance}, Path=ShowDesktopButton, UpdateSourceTrigger=PropertyChanged}">
+                                <Label Content="{DynamicResource add_show_desktop_button}" />
+                            </CheckBox>
                             <DockPanel>
                                 <CheckBox x:Name="cbCollapseTrayIcons"
                                           IsChecked="{Binding Source={x:Static Settings:Settings.Instance}, Path=CollapseNotifyIcons, UpdateSourceTrigger=PropertyChanged}">

RetroBar/RetroBar.csproj

@@ -34,6 +34,8 @@
   </ItemGroup>
 
   <ItemGroup>
+	<None Remove="Resources\desktop95-sm.png" />
+	<None Remove="Resources\desktop95-lg.png" />
     <None Remove="Resources\retrobar.ico" />
     <None Remove="Resources\shader_invert.ps" />
     <None Remove="Resources\start9x.png" />
@@ -43,7 +45,7 @@
 
   <ItemGroup>
     <PackageReference Include="gong-wpf-dragdrop" Version="3.1.1" />
-    <PackageReference Include="ManagedShell" Version="0.0.200" />
+    <PackageReference Include="ManagedShell" Version="0.0.202" />
     <PackageReference Include="System.Net.Http.Json" Version="6.0.0" />
   </ItemGroup>
 
@@ -52,6 +54,8 @@
   </ItemGroup>
 
   <ItemGroup>
+	<Resource Include="Resources\desktop95-sm.png" />
+	<Resource Include="Resources\desktop95-lg.png" />
     <Resource Include="Resources\shader_invert.ps" />
     <Resource Include="Resources\retrobar.ico">
       <CopyToOutputDirectory>Never</CopyToOutputDirectory>

RetroBar/Taskbar.xaml

@@ -56,6 +56,16 @@
                              RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=Window}" />
                 </DockPanel.Dock>
             </controls:Toolbar>
+            <controls:ShowDesktopButton x:Name="ShowDesktopButtonTray"
+                                        TasksService="{Binding TasksService}"
+                                        Visibility="Collapsed">
+                <DockPanel.Dock>
+                    <Binding Converter="{StaticResource dockOrientationConverter}"
+                             ConverterParameter="trailing"
+                             Path="Orientation"
+                             RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=Window}" />
+                </DockPanel.Dock>
+            </controls:ShowDesktopButton>
             <GroupBox Style="{DynamicResource Tray}"
                       PreviewMouseRightButtonUp="NotifyArea_PreviewMouseRightButtonUp">
                 <DockPanel.Dock>

RetroBar/Taskbar.xaml.cs

@@ -50,6 +50,11 @@ public Taskbar(WindowManager windowManager, ShellManager shellManager, StartMenu
                 QuickLaunchToolbar.Visibility = Visibility.Visible;
             }
 
+            if (Settings.Instance.ShowDesktopButton)
+            {
+                ShowDesktopButtonTray.Visibility = Visibility.Visible;
+            }
+
             // Hide the start button on secondary display(s)
             if (!Screen.Primary)
             {
@@ -162,6 +167,17 @@ private void Settings_PropertyChanged(object sender, PropertyChangedEventArgs e)
                     return;
                 }
             }
+            else if (e.PropertyName == "ShowDesktopButton")
+            {
+                if (Settings.Instance.ShowDesktopButton)
+                {
+                    ShowDesktopButtonTray.Visibility = Visibility.Visible;
+                }
+                else
+                {
+                    ShowDesktopButtonTray.Visibility = Visibility.Collapsed;
+                }
+            }
         }
 
         private void Taskbar_OnLocationChanged(object sender, EventArgs e)

RetroBar/Themes/System XP.xaml

@@ -5,6 +5,11 @@
     <BitmapImage x:Key="StartIconImage"
                  UriSource="../Resources/startxpclassic.png" />
 
+    <BitmapImage x:Key="ShowDesktopIconImageSmall"
+                 UriSource="../Resources/desktopxp-sm.png" />
+    <BitmapImage x:Key="ShowDesktopIconImageLarge"
+                 UriSource="../Resources/desktopxp-lg.png" />
+
     <Style TargetType="Image"
            x:Key="StartIcon"
            BasedOn="{StaticResource StartIcon}">