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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,250 @@ | ||
| using CoreAppUWP.Common; | ||
| using Microsoft.UI.Composition; | ||
| using Microsoft.UI.Composition.SystemBackdrops; | ||
| using Microsoft.UI.Xaml; | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using Windows.UI; | ||
| using WinRT; // required to support Window.As<ICompositionSupportsSystemBackdrop>() | ||
|
|
||
| namespace CoreAppUWP.Helpers | ||
| { | ||
| public enum BackdropType | ||
| { | ||
| Mica, | ||
| MicaAlt, | ||
| DesktopAcrylic, | ||
| DefaultColor, | ||
| } | ||
|
|
||
| public partial class BackdropHelper | ||
| { | ||
| private readonly Window window; | ||
| private readonly WindowsSystemDispatcherQueueHelper m_wsdqHelper; | ||
| private MicaController m_micaController; | ||
| private DesktopAcrylicController m_acrylicController; | ||
| private SystemBackdropConfiguration m_configurationSource; | ||
|
|
||
| public BackdropType? Backdrop { get; private set; } = null; | ||
| public WeakEvent<BackdropType?> BackdropTypeChanged { get; } = []; | ||
|
|
||
| public BackdropHelper(Window window) | ||
| { | ||
| this.window = window; | ||
| m_wsdqHelper = new WindowsSystemDispatcherQueueHelper(); | ||
| m_wsdqHelper.EnsureWindowsSystemDispatcherQueueController(); | ||
| } | ||
|
|
||
| public void SetBackdrop(BackdropType type) | ||
| { | ||
| if (type == Backdrop) { return; } | ||
|
|
||
| // Reset to default color. If the requested type is supported, we'll update to that. | ||
| // Note: This sample completely removes any previous controller to reset to the default | ||
| // state. This is done so this sample can show what is expected to be the most | ||
| // common pattern of an app simply choosing one controller type which it sets at | ||
| // startup. If an app wants to toggle between Mica and Acrylic it could simply | ||
| // call RemoveSystemBackdropTarget() on the old controller and then setup the new | ||
| // controller, reusing any existing m_configurationSource and Activated/Closed | ||
| // event handlers. | ||
| Backdrop = BackdropType.DefaultColor; | ||
| if (m_micaController != null) | ||
| { | ||
| m_micaController.Dispose(); | ||
| m_micaController = null; | ||
| } | ||
| if (m_acrylicController != null) | ||
| { | ||
| m_acrylicController.Dispose(); | ||
| m_acrylicController = null; | ||
| } | ||
| window.Closed -= Window_Closed; | ||
| window.Activated -= Window_Activated; | ||
| ((FrameworkElement)window.Content).ActualThemeChanged -= Window_ThemeChanged; | ||
| m_configurationSource = null; | ||
|
|
||
| if (type is BackdropType.Mica or BackdropType.MicaAlt) | ||
| { | ||
| if (TrySetMicaBackdrop(type == BackdropType.MicaAlt ? MicaKind.BaseAlt : MicaKind.Base)) | ||
| { | ||
| Backdrop = type; | ||
| } | ||
| //else | ||
| //{ | ||
| // // Mica isn't supported. Try Acrylic. | ||
| // type = BackdropType.DesktopAcrylic; | ||
| //} | ||
| } | ||
| if (type == BackdropType.DesktopAcrylic) | ||
| { | ||
| if (TrySetAcrylicBackdrop()) | ||
| { | ||
| Backdrop = type; | ||
| } | ||
| } | ||
|
|
||
| BackdropTypeChanged.Invoke(Backdrop); | ||
| } | ||
|
|
||
| private bool TrySetMicaBackdrop(MicaKind kind = MicaKind.Base) | ||
| { | ||
| if (MicaController.IsSupported()) | ||
| { | ||
| // Hooking up the policy object | ||
| m_configurationSource = new SystemBackdropConfiguration(); | ||
|
|
||
| window.Closed += Window_Closed; | ||
| window.Activated += Window_Activated; | ||
| ((FrameworkElement)window.Content).ActualThemeChanged += Window_ThemeChanged; | ||
|
|
||
| // Initial configuration state. | ||
| m_configurationSource.IsInputActive = true; | ||
| SetConfigurationSourceTheme(); | ||
|
|
||
| m_micaController = new MicaController { Kind = kind }; | ||
|
|
||
| // Enable the system backdrop. | ||
| // Note: Be sure to have "using WinRT;" to support the Window.As<...>() call. | ||
| m_micaController.AddSystemBackdropTarget(window.As<ICompositionSupportsSystemBackdrop>()); | ||
| m_micaController.SetSystemBackdropConfiguration(m_configurationSource); | ||
| return true; // succeeded | ||
| } | ||
|
|
||
| return false; // Mica is not supported on this system | ||
| } | ||
|
|
||
| private bool TrySetAcrylicBackdrop() | ||
| { | ||
| if (DesktopAcrylicController.IsSupported()) | ||
| { | ||
| // Hooking up the policy object | ||
| m_configurationSource = new SystemBackdropConfiguration(); | ||
|
|
||
| window.Closed += Window_Closed; | ||
| window.Activated += Window_Activated; | ||
| ((FrameworkElement)window.Content).ActualThemeChanged += Window_ThemeChanged; | ||
|
|
||
| // Initial configuration state. | ||
| m_configurationSource.IsInputActive = true; | ||
| SetConfigurationSourceTheme(); | ||
|
|
||
| Color BackgroundColor = ThemeHelper.IsDarkTheme() ? Color.FromArgb(255, 32, 32, 32) : Color.FromArgb(255, 243, 243, 243); | ||
| m_acrylicController = new DesktopAcrylicController { TintColor = BackgroundColor, FallbackColor = BackgroundColor }; | ||
|
|
||
| // Enable the system backdrop. | ||
| // Note: Be sure to have "using WinRT;" to support the Window.As<...>() call. | ||
| m_acrylicController.AddSystemBackdropTarget(window.As<ICompositionSupportsSystemBackdrop>()); | ||
| m_acrylicController.SetSystemBackdropConfiguration(m_configurationSource); | ||
| return true; // succeeded | ||
| } | ||
|
|
||
| return false; // Acrylic is not supported on this system | ||
| } | ||
|
|
||
| private void Window_Activated(object sender, WindowActivatedEventArgs args) | ||
| { | ||
| m_configurationSource.IsInputActive = args.WindowActivationState != WindowActivationState.Deactivated; | ||
| } | ||
|
|
||
| private void Window_Closed(object sender, WindowEventArgs args) | ||
| { | ||
| // Make sure any Mica/Acrylic controller is disposed so it doesn't try to | ||
| // use this closed window. | ||
| if (m_micaController != null) | ||
| { | ||
| m_micaController.Dispose(); | ||
| m_micaController = null; | ||
| } | ||
| if (m_acrylicController != null) | ||
| { | ||
| m_acrylicController.Dispose(); | ||
| m_acrylicController = null; | ||
| } | ||
| ((FrameworkElement)window.Content).ActualThemeChanged -= Window_ThemeChanged; | ||
| window.Activated -= Window_Activated; | ||
| m_configurationSource = null; | ||
| } | ||
|
|
||
| private void Window_ThemeChanged(FrameworkElement sender, object args) | ||
| { | ||
| if (m_configurationSource != null) | ||
| { | ||
| SetConfigurationSourceTheme(); | ||
| } | ||
| if (m_acrylicController != null) | ||
| { | ||
| Color BackgroundColor = sender.ActualTheme.IsDarkTheme() ? Color.FromArgb(255, 32, 32, 32) : Color.FromArgb(255, 243, 243, 243); | ||
| m_acrylicController.TintColor = m_acrylicController.FallbackColor = BackgroundColor; | ||
| } | ||
| } | ||
|
|
||
| private void SetConfigurationSourceTheme() | ||
| { | ||
| switch (((FrameworkElement)window.Content).ActualTheme) | ||
| { | ||
| case ElementTheme.Dark: m_configurationSource.Theme = SystemBackdropTheme.Dark; break; | ||
| case ElementTheme.Light: m_configurationSource.Theme = SystemBackdropTheme.Light; break; | ||
| case ElementTheme.Default: m_configurationSource.Theme = SystemBackdropTheme.Default; break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public partial class BackdropHelper | ||
| { | ||
| public static void RegisterWindow(Window window) | ||
| { | ||
| if (!ActiveWindows.ContainsKey(window)) | ||
| { | ||
| window.Closed += (sender, args) => | ||
| { | ||
| ActiveWindows.Remove(window); | ||
| window = null; | ||
| }; | ||
| ActiveWindows[window] = new BackdropHelper(window); | ||
| } | ||
| } | ||
|
|
||
| public static void SetBackdrop(Window window, BackdropType type) | ||
| { | ||
| if (ActiveWindows.TryGetValue(window, out BackdropHelper backdrop)) | ||
| { | ||
| backdrop.SetBackdrop(type); | ||
| } | ||
| } | ||
|
|
||
| public static void SetAllBackdrop(BackdropType type) | ||
| { | ||
| ActiveWindows.Values.ForEach(async x => | ||
| { | ||
| if (x.window.Dispatcher?.HasThreadAccess == false) | ||
| { | ||
| await x.window.Dispatcher.ResumeForegroundAsync(); | ||
| } | ||
| x.SetBackdrop(type); | ||
| }); | ||
| } | ||
|
|
||
| public static BackdropType? GetBackdrop(Window window) | ||
| { | ||
| return ActiveWindows.TryGetValue(window, out BackdropHelper backdrop) ? backdrop.Backdrop : null; | ||
| } | ||
|
|
||
| public static void AddBackdropTypeChanged(Window window, Action<BackdropType?> typedEventHandler) | ||
| { | ||
| if (ActiveWindows.TryGetValue(window, out BackdropHelper backdrop)) | ||
| { | ||
| backdrop.BackdropTypeChanged.Add(typedEventHandler); | ||
| } | ||
| } | ||
|
|
||
| public static void RemoveBackdropTypeChanged(Window window, Action<BackdropType?> typedEventHandler) | ||
| { | ||
| if (ActiveWindows.TryGetValue(window, out BackdropHelper backdrop)) | ||
| { | ||
| backdrop.BackdropTypeChanged.Remove(typedEventHandler); | ||
| } | ||
| } | ||
|
|
||
| public static Dictionary<Window, BackdropHelper> ActiveWindows { get; } = []; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| using System; | ||
| using System.Runtime.InteropServices; // For DllImport | ||
| using Windows.System; | ||
|
|
||
| namespace CoreAppUWP.Helpers | ||
| { | ||
| public partial class WindowsSystemDispatcherQueueHelper | ||
| { | ||
| [StructLayout(LayoutKind.Sequential)] | ||
| private struct DispatcherQueueOptions | ||
| { | ||
| internal int DWSize; | ||
| internal int ThreadType; | ||
| internal int ApartmentType; | ||
| } | ||
|
|
||
| [LibraryImport("CoreMessaging.dll")] | ||
| private static unsafe partial int CreateDispatcherQueueController(DispatcherQueueOptions options, IntPtr* instance); | ||
|
|
||
| private IntPtr m_dispatcherQueueController = IntPtr.Zero; | ||
| public void EnsureWindowsSystemDispatcherQueueController() | ||
| { | ||
| if (DispatcherQueue.GetForCurrentThread() != null) | ||
| { | ||
| // one already exists, so we'll just use it. | ||
| return; | ||
| } | ||
|
|
||
| if (m_dispatcherQueueController == IntPtr.Zero) | ||
| { | ||
| DispatcherQueueOptions options; | ||
| options.DWSize = Marshal.SizeOf(typeof(DispatcherQueueOptions)); | ||
| options.ThreadType = 2; // DQTYPE_THREAD_CURRENT | ||
| options.ApartmentType = 2; // DQTAT_COM_STA | ||
|
|
||
| unsafe | ||
| { | ||
| IntPtr dispatcherQueueController; | ||
| _ = CreateDispatcherQueueController(options, &dispatcherQueueController); | ||
| m_dispatcherQueueController = dispatcherQueueController; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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