Implement a Windows like language switcher for the input language button (InputLanguage)

RetroBar/Controls/InputLanguage.xaml

@@ -2,6 +2,7 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:converters="clr-namespace:RetroBar.Converters"
+             MouseLeftButtonDown="UserControl_MouseLeftButtonDown"
              Loaded="UserControl_Loaded"
              Unloaded="UserControl_Unloaded">
     <UserControl.Resources>
@@ -24,7 +25,7 @@
                    Style="{DynamicResource LanguageBar}">
             <TextBlock x:Name="InputLanguageText"
                    Style="{DynamicResource InputLanguage}"
-                   Text="{Binding Path=LocaleIdentifier, Converter={StaticResource cultureInfoToLocaleNameConverter}, ConverterParameter=TwoLetterIsoLanguageName, Mode=OneWay}">
+                   Text="{Binding Path=LocaleIdentifier, Converter={StaticResource cultureInfoToLocaleNameConverter}, ConverterParameter=TwoLetterIsoLanguageName, Mode=OneWay}" HorizontalAlignment="Left">
             </TextBlock>
         </WrapPanel>
     </DockPanel>

RetroBar/Controls/InputLanguage.xaml.cs

@@ -3,14 +3,31 @@
 using System.Globalization;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Media;
 using System.Windows.Threading;
 using ManagedShell.Common.Helpers;
 using ManagedShell.Common.Logging;
 using RetroBar.Converters;
 using RetroBar.Utilities;
+using WinForms = System.Windows.Forms;
 
 namespace RetroBar.Controls
 {
+    public static class InputMethodSwitcher
+    {
+        public static void Toggle()
+        {
+            var list = WinForms.InputLanguage.InstalledInputLanguages.Cast<WinForms.InputLanguage>().ToList();
+            if (list.Count < 2)
+                return;
+
+            var current = WinForms.InputLanguage.CurrentInputLanguage;
+            int index = list.IndexOf(current);
+            int next = (index + 1) % list.Count;
+
+            WinForms.InputLanguage.CurrentInputLanguage = list[next];
+        }
+    }
     public partial class InputLanguage : UserControl
     {
         public static DependencyProperty LocaleIdentifierProperty = DependencyProperty.Register(nameof(LocaleIdentifier), typeof(CultureInfo), typeof(InputLanguage));
@@ -64,7 +81,7 @@ private void SetLocaleIdentifier()
         private void StartWatch()
         {
             SetLocaleIdentifier();
-            
+
             layoutWatch.Start();
 
             Visibility = Visibility.Visible;
@@ -84,7 +101,7 @@ private void JapaneseImeAdd()
             var NewControl = new JapaneseIme();
             InputLanguageDockPanel.Children.Add(NewControl);
         }
-        
+
         private void JapaneseImeRemove()
         {
             var DelControl = InputLanguageDockPanel.Children
@@ -171,10 +188,71 @@ private void UserControl_Loaded(object sender, RoutedEventArgs e)
         private void UserControl_Unloaded(object sender, RoutedEventArgs e)
         {
             StopWatch();
-            
+
             Settings.Instance.PropertyChanged -= Settings_PropertyChanged;
 
             _isLoaded = false;
         }
+
+        private void ShowLanguageMenu()
+        {
+            var menu = new ContextMenu();
+
+            foreach (WinForms.InputLanguage lang in WinForms.InputLanguage.InstalledInputLanguages)
+            {
+                string code = lang.Culture.TwoLetterISOLanguageName.ToUpperInvariant();
+
+                var panel = new StackPanel
+                {
+                    Orientation = Orientation.Horizontal,
+                    Margin = new Thickness(0, 0, 0, 0)
+                };
+
+                var badge = new Border
+                {
+                    Background = (Brush)Application.Current.Resources["InputLanguageBackground"],
+                    Padding = new Thickness(1, 1, 2, 3),
+                    Margin = new Thickness(0, 0, 6, 0),
+                    Child = new TextBlock
+                    {
+                        Text = code,
+                        FontSize = 10,
+                        FontWeight = FontWeights.UltraLight,
+                        Foreground = (Brush)Application.Current.Resources["InputLanguageSelectorForeground"]
+                    }
+                };
+
+                var text = new TextBlock
+                {
+                    Text = lang.Culture.DisplayName
+                };
+
+                panel.Children.Add(badge);
+                panel.Children.Add(text);
+
+                var item = new MenuItem
+                {
+                    Header = panel,
+                    Tag = lang,
+                    IsCheckable = true,
+                    IsChecked = lang.Equals(WinForms.InputLanguage.CurrentInputLanguage)
+                };
+
+                item.Click += (s, e) =>
+                {
+                    WinForms.InputLanguage.CurrentInputLanguage = (WinForms.InputLanguage)((MenuItem)s).Tag;
+                };
+
+                menu.Items.Add(item);
+            }
+
+            menu.PlacementTarget = this;
+            menu.IsOpen = true;
+        }
+
+        private void UserControl_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+        {
+            ShowLanguageMenu();//InputMethodSwitcher.Toggle();
+        }
     };
 }

RetroBar/Themes/System.xaml

@@ -24,6 +24,7 @@
     <SolidColorBrush x:Key="ClockForeground" Color="{x:Static SystemColors.ControlTextColor}" />
     <SolidColorBrush x:Key="InputLanguageForeground" Color="{x:Static SystemColors.HighlightTextColor}" />
     <SolidColorBrush x:Key="InputLanguageBackground" Color="{x:Static SystemColors.HighlightColor}" />
+    <SolidColorBrush x:Key="InputLanguageSelectorForeground" Color="{x:Static SystemColors.HighlightTextColor}" />
 
     <SolidColorBrush x:Key="ToolTipBackground" Color="{x:Static SystemColors.InfoColor}" />
     <SolidColorBrush x:Key="ToolTipForeground" Color="{x:Static SystemColors.InfoTextColor}" />
@@ -1060,7 +1061,6 @@
                                     Width="3">
                                 <Border BorderThickness="1,1,0,0"
                                         BorderBrush="{DynamicResource ButtonHighlight}">
-
                                 </Border>
                             </Border>
                         </Border>

RetroBar/Themes/Windows Longhorn Aero.xaml

@@ -56,6 +56,7 @@
     <SolidColorBrush x:Key="TaskbarTopInnerBorder1" Color="#d6ffffff" />
     <SolidColorBrush x:Key="TaskbarTopInnerBorder2" Color="#7dffffff" />
     <SolidColorBrush x:Key="TaskbarBottomBorder" Color="#c7ffffff" />
+    <SolidColorBrush x:Key="InputLanguageSelectorForeground" Color="#000000" />
 
     <SolidColorBrush x:Key="TrayToggleBorder" Color="#99000000" />
     <SolidColorBrush x:Key="TrayToggleInnerBorder" Color="#e6ffffff" />

RetroBar/Themes/Windows Vista Aero.xaml

@@ -44,6 +44,7 @@
     <SolidColorBrush x:Key="TaskbarVerticalTopInnerBorder" Color="#e59e9e9e" />
     <SolidColorBrush x:Key="TaskbarVerticalBottomInnerBorder" Color="#c2000000" />
     <SolidColorBrush x:Key="TaskbarVerticalBottomBorder" Color="#f7000000" />
+    <SolidColorBrush x:Key="InputLanguageSelectorForeground" Color="#000000" />
 
     <SolidColorBrush x:Key="TrayToggleOuterBorder" Color="#20ffffff" />
     <SolidColorBrush x:Key="TrayToggleBorder" Color="#99000000" />

RetroBar/Themes/Windows Vista Basic.xaml

@@ -51,6 +51,7 @@
     <SolidColorBrush x:Key="TaskbarVerticalTopInnerBorder" Color="#B4B4B4" />
     <SolidColorBrush x:Key="TaskbarVerticalBottomInnerBorder" Color="#1C1E1F" />
     <SolidColorBrush x:Key="TaskbarVerticalBottomBorder" Color="#1B1D1F" />
+    <SolidColorBrush x:Key="InputLanguageSelectorForeground" Color="#000000" />
 
     <LinearGradientBrush x:Key="TaskButtonThumbnailBackground"
                          StartPoint="0,0"