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Feature/language flyout #737

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58bf0da
feat(language-flyout): simplify implementation and remove scope bloat…
bropines Aug 6, 2026
26027a5
refactor(language-flyout): use WM_INPUTLANGCHANGE message in WndProc …
bropines Aug 6, 2026
96b3fd2
fix(language-flyout): detect input layout change on key events in low…
bropines Aug 6, 2026
c492265
refactor(language-flyout): simplify layout detection logic in HookProc
bropines Aug 10, 2026
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8 changes: 8 additions & 0 deletions FluentFlyoutWPF/Classes/NativeMethods.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,9 +49,11 @@ public static partial class NativeMethods
internal const int WM_KEYDOWN = 0x0100;
internal const int WM_KEYUP = 0x0101;
internal const int WM_SETTINGCHANGE = 0x001A;
internal const int WM_INPUTLANGCHANGE = 0x0051;

// Shell Hook Messages
internal const int HSHELL_APPCOMMAND = 12;
internal const int HSHELL_LANGUAGE = 0x0037;

// App Command Messages
internal const int APPCOMMAND_VOLUME_MUTE = 8;
Expand Down Expand Up @@ -261,6 +263,12 @@ internal struct WindowCompositionAttributeData
[return: MarshalAs(UnmanagedType.Bool)]
internal static partial bool IsIconic(IntPtr hWnd);

[LibraryImport("user32.dll", SetLastError = true)]
internal static partial uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

[LibraryImport("user32.dll")]
internal static partial IntPtr GetKeyboardLayout(uint idThread);

[LibraryImport("user32.dll", EntryPoint = "SetWindowLongW")]
internal static partial int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

Expand Down
24 changes: 24 additions & 0 deletions FluentFlyoutWPF/MainWindow.xaml.cs
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Expand Up @@ -71,6 +71,7 @@ public partial class MainWindow : MicaWindow
private bool _isHiding = true;

private LockWindow? lockWindow;
private IntPtr _lastLanguageLayout = IntPtr.Zero;
private DateTime _lastSelfUpdateTimestamp = DateTime.MinValue;

internal TaskbarWindow? taskbarWindow;
Expand Down Expand Up @@ -177,6 +178,7 @@ public MainWindow()
RegisterShellHookWindow(new WindowInteropHelper(this).Handle);

_positionTimer = new Timer(SeekbarUpdateUi, null, Timeout.Infinite, Timeout.Infinite);

if (_seekBarEnabled && GetActiveMediaSession() is { } session)
{
UpdateSeekbarCurrentDuration(session.ControlSession.GetTimelineProperties().Position);
Expand Down Expand Up @@ -854,6 +856,19 @@ private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
lockWindow.ShowLockFlyout("Insert", Keyboard.IsKeyToggled(Key.Insert));
}
}

if (SettingsManager.Current.LanguageFlyoutEnabled && !FullscreenDetector.IsFullscreenApplicationRunning())
{
IntPtr fgWindow = NativeMethods.GetForegroundWindow();
IntPtr hkl = NativeMethods.GetKeyboardLayout(NativeMethods.GetWindowThreadProcessId(fgWindow, IntPtr.Zero));

if (hkl != IntPtr.Zero && _lastLanguageLayout != IntPtr.Zero && hkl != _lastLanguageLayout)
{
lockWindow ??= new LockWindow();
lockWindow.ShowLanguageFlyout();
}
if (hkl != IntPtr.Zero) _lastLanguageLayout = hkl;
}
}
return CallNextHookEx(_hookId, nCode, wParam, lParam);
}
Expand Down Expand Up @@ -1525,6 +1540,15 @@ private async Task<bool> WaitForExplorerReadyAsync(int timeoutMs = 60000)

private nint WndProc(nint hwnd, int msg, nint wParam, nint lParam, ref bool handled)
{
if (msg == WM_INPUTLANGCHANGE || (msg == WM_SHELLHOOK && (int)wParam == HSHELL_LANGUAGE))
{
if (SettingsManager.Current.LanguageFlyoutEnabled)
{
lockWindow ??= new LockWindow();
lockWindow.ShowLanguageFlyout();
}
}

// detect key presses from both keyboard hook and shell hook to show flyouts
if (msg == WM_SHELLHOOK && wParam == HSHELL_APPCOMMAND)
{
Expand Down
53 changes: 52 additions & 1 deletion FluentFlyoutWPF/Pages/LockKeysPage.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,10 @@
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Margin="0,0,0,24">
<Border CornerRadius="10" ClipToBounds="True" Width="164" Height="98">
Expand Down Expand Up @@ -124,7 +128,7 @@
</ui:CardControl.Header>
<ui:ToggleSwitch Name="LockKeysNumSwitch" IsChecked="{Binding LockKeysNumEnabled, Mode=TwoWay}" />
</ui:CardControl>
<ui:CardControl x:Name="EnableScrollTitleCard" Tag="Indexable" Grid.Row="10" Icon="{ui:SymbolIcon ArrowBetweenDown24}" Margin="0,0,0,76">
<ui:CardControl x:Name="EnableScrollTitleCard" Tag="Indexable" Grid.Row="10" Icon="{ui:SymbolIcon ArrowBetweenDown24}" Margin="0,0,0,3">
<ui:CardControl.Header>
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
Expand All @@ -136,6 +140,53 @@
</ui:CardControl.Header>
<ui:ToggleSwitch Name="LockKeysScrollSwitch" IsChecked="{Binding LockKeysScrollEnabled, Mode=TwoWay}" />
</ui:CardControl>

<ui:CardControl x:Name="LanguageFlyoutSwitchCard" Tag="Indexable" Grid.Row="11" Icon="{ui:SymbolIcon LocalLanguage24}" Margin="0,24,0,3">
<ui:CardControl.Header>
<StackPanel Orientation="Vertical">
<TextBlock Text="{DynamicResource LanguageFlyoutTitle}" FontSize="14" FontWeight="Regular" VerticalAlignment="Center" />
<TextBlock Text="{DynamicResource LanguageFlyoutDescription}" FontSize="12" Opacity="0.5" />
</StackPanel>
</ui:CardControl.Header>
<ui:ToggleSwitch Name="LanguageFlyoutSwitch" IsChecked="{Binding LanguageFlyoutEnabled, Mode=TwoWay}" />
</ui:CardControl>

<ui:CardControl x:Name="LanguageFlyoutShowRegionCard" Tag="Indexable" Grid.Row="12" Icon="{ui:SymbolIcon Info24}" Margin="0,0,0,3">
<ui:CardControl.Header>
<StackPanel Orientation="Vertical">
<TextBlock Text="{DynamicResource LanguageFlyoutShowRegionTitle}" FontSize="14" FontWeight="Regular" VerticalAlignment="Center" />
<TextBlock Text="{DynamicResource LanguageFlyoutShowRegionDescription}" FontSize="12" Opacity="0.5" />
</StackPanel>
</ui:CardControl.Header>
<ui:ToggleSwitch Name="LanguageFlyoutShowRegionSwitch" IsChecked="{Binding LanguageFlyoutShowRegion, Mode=TwoWay}" />
</ui:CardControl>

<ui:CardControl x:Name="LanguageFlyoutDurationCard" Tag="Indexable" Grid.Row="13" Icon="{ui:SymbolIcon Timer24}" Margin="0,0,0,3">
<ui:CardControl.Header>
<StackPanel Orientation="Vertical">
<TextBlock Text="{DynamicResource LanguageFlyoutDurationTitle}" FontSize="14" FontWeight="Regular" VerticalAlignment="Center" />
<TextBlock Text="{DynamicResource LanguageFlyoutDurationDescription}" FontSize="12" Opacity="0.5" />
</StackPanel>
</ui:CardControl.Header>
<StackPanel Orientation="Horizontal">
<ui:TextBox Width="60" ClearButtonEnabled="False" Text="{Binding LanguageFlyoutDurationText, Mode=TwoWay}" />
<TextBlock Text="{DynamicResource MillisecondsUnit}" FontSize="14" FontWeight="Regular" Margin="10,0,0,0" VerticalAlignment="Center" />
</StackPanel>
</ui:CardControl>

<ui:CardControl x:Name="LanguageFlyoutWidthCard" Tag="Indexable" Grid.Row="14" Icon="{ui:SymbolIcon ArrowFit24}" Margin="0,0,0,76">
<ui:CardControl.Header>
<StackPanel Orientation="Vertical">
<TextBlock Text="{DynamicResource LanguageFlyoutWidthTitle}" FontSize="14" FontWeight="Regular" VerticalAlignment="Center" />
<TextBlock Text="{DynamicResource LanguageFlyoutWidthDescription}" FontSize="12" Opacity="0.5" />
</StackPanel>
</ui:CardControl.Header>
<StackPanel Orientation="Horizontal">
<Slider Minimum="160" Maximum="400" Value="{Binding LanguageFlyoutWidth, Mode=TwoWay}" TickFrequency="10" IsSnapToTickEnabled="True" Width="150" VerticalAlignment="Center" />
<ui:TextBlock Text="{Binding LanguageFlyoutWidth}" Width="30" TextAlignment="Center" Margin="12,0,0,0" VerticalAlignment="Center" />
<TextBlock Text="px" FontSize="14" FontWeight="Regular" Margin="4,0,0,0" VerticalAlignment="Center" Opacity="0.5" />
</StackPanel>
</ui:CardControl>
</Grid>
</StackPanel>
</Page>
8 changes: 8 additions & 0 deletions FluentFlyoutWPF/Resources/Localization/Dictionary-en-US.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -230,6 +230,14 @@ You can help contribute translations on</System:String>
<System:String x:Key="LockWindow_InsertPressed">Insert Pressed</System:String>
<System:String x:Key="LockWindow_LockOn">on</System:String>
<System:String x:Key="LockWindow_LockOff">off</System:String>
<System:String x:Key="LanguageFlyoutTitle">Language Flyout</System:String>
<System:String x:Key="LanguageFlyoutDescription">Show flyout when switching keyboard input layout</System:String>
<System:String x:Key="LanguageFlyoutShowRegionTitle">Show Country / Region</System:String>
<System:String x:Key="LanguageFlyoutShowRegionDescription">Include country or region in parentheses (e.g. English (United States))</System:String>
<System:String x:Key="LanguageFlyoutDurationTitle">Display Duration</System:String>
<System:String x:Key="LanguageFlyoutDurationDescription">Duration the language flyout stays on screen</System:String>
<System:String x:Key="LanguageFlyoutWidthTitle">Flyout Width</System:String>
<System:String x:Key="LanguageFlyoutWidthDescription">Custom width of the language flyout in pixels</System:String>
<System:String x:Key="NextUpWindow_UpNextText">Up next:</System:String>
<System:String x:Key="TrayIcon_SettingsOption">Settings</System:String>
<System:String x:Key="TrayIcon_GitHubRepositoryOption">Repository</System:String>
Expand Down
8 changes: 8 additions & 0 deletions FluentFlyoutWPF/Resources/Localization/Dictionary-ru.xaml
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Expand Up @@ -288,4 +288,12 @@
<system:String x:Key="TaskbarWidgetScrollingTextSpeedTitle">Скорость прокрутки</system:String>
<system:String x:Key="Back">Назад</system:String>
<system:String x:Key="OnboardingStepsCounter">Шаг {0} из {1}</system:String>
<system:String x:Key="LanguageFlyoutTitle">Окно раскладки клавиатуры</system:String>
<system:String x:Key="LanguageFlyoutDescription">Отображать всплывающее окно при переключении языка ввода</system:String>
<system:String x:Key="LanguageFlyoutShowRegionTitle">Показывать страну / регион</system:String>
<system:String x:Key="LanguageFlyoutShowRegionDescription">Включать страну или регион в скобках (например, Русский (Россия))</system:String>
<system:String x:Key="LanguageFlyoutDurationTitle">Время отображения</system:String>
<system:String x:Key="LanguageFlyoutDurationDescription">Длительность отображения окна смены языка</system:String>
<system:String x:Key="LanguageFlyoutWidthTitle">Ширина окна</system:String>
<system:String x:Key="LanguageFlyoutWidthDescription">Настраиваемая ширина окна смены языка в пикселях</system:String>
</ResourceDictionary>
52 changes: 52 additions & 0 deletions FluentFlyoutWPF/ViewModels/UserSettings.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,55 @@ public string LockKeysDurationText
}
}

/// <summary>
/// Enable language switcher flyout
/// </summary>
[ObservableProperty]
public partial bool LanguageFlyoutEnabled { get; set; }

/// <summary>
/// Show region/country in parentheses in language flyout
/// </summary>
[ObservableProperty]
public partial bool LanguageFlyoutShowRegion { get; set; }

/// <summary>
/// Language flyout display duration (milliseconds)
/// </summary>
[ObservableProperty]
[NotifyPropertyChangedFor(nameof(LanguageFlyoutDurationText))]
public partial int LanguageFlyoutDuration { get; set; }

[XmlIgnore]
public string LanguageFlyoutDurationText
{
get => LanguageFlyoutDuration.ToString();
set
{
if (int.TryParse(value, out var result))
{
LanguageFlyoutDuration = result switch
{
> 10000 => 10000,
< 0 => 0,
_ => result
};
}
else
{
LanguageFlyoutDuration = 2000;
}

OnPropertyChanged();
}
}

/// <summary>
/// Language flyout width (pixels)
/// </summary>
[ObservableProperty]
public partial int LanguageFlyoutWidth { get; set; }

/// <summary>
/// App theme. 0 for default, 1 for light, 2 for dark.
/// </summary>
Expand Down Expand Up @@ -711,6 +760,9 @@ public UserSettings()
LockKeysNumEnabled = true;
LockKeysScrollEnabled = true;
LockKeysDuration = 2000;
LanguageFlyoutEnabled = true;
LanguageFlyoutDuration = 2000;
LanguageFlyoutWidth = 220;
AppTheme = 0;
MediaFlyoutEnabled = true;
MediaFlyoutAlwaysDisplay = false;
Expand Down
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