Nikita Tsukanov
1 year ago
committed by
GitHub
GitHub
15 changed files with 722 additions and 47 deletions
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using System.Runtime.InteropServices; |
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namespace XEmbedSample; |
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/* |
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This is needed specifically for GtkSharp: |
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https://github.com/mono/SkiaSharp/issues/3038
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https://github.com/GtkSharp/GtkSharp/issues/443
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Instead of using plain DllImport they are manually calling dlopen with RTLD_GLOBAL and RTLD_LAZY flags: |
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https://github.com/GtkSharp/GtkSharp/blob/b7303616129ab5a0ca64def45649ab522d83fa4a/Source/Libs/Shared/FuncLoader.cs#L80-L92
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Which causes libHarfBuzzSharp.so from HarfBuzzSharp to resolve some of the symbols from the system libharfbuzz.so.0 |
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which is a _different_ harfbuzz version. |
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That results in a segfault. |
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Previously there was a workaround - https://github.com/mono/SkiaSharp/pull/2247 but it got
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disabled for .NET Core / .NET 5+. |
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Why linux linker builds shared libraries in a way that makes it possible for them to resolve their own symbols from |
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elsewhere escapes me. |
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Here we are loading libHarfBuzzSharp.so from the .NET-resolved location, saving it, unloading the library |
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and then defining a custom resolver that would call dlopen with RTLD_NOW + RTLD_DEEPBIND |
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*/ |
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public unsafe class HarfbuzzWorkaround |
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{ |
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[DllImport("libc")] |
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static extern int dlinfo(IntPtr handle, int request, IntPtr info); |
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[DllImport("libc")] |
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static extern IntPtr dlopen(string filename, int flags); |
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private const int RTLD_DI_ORIGIN = 6; |
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private const int RTLD_NOW = 2; |
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private const int RTLD_DEEPBIND = 8; |
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public static void Apply() |
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{ |
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if (RuntimeInformation.RuntimeIdentifier.Contains("musl")) |
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throw new PlatformNotSupportedException("musl doesn't support RTLD_DEEPBIND"); |
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var libraryPathBytes = Marshal.AllocHGlobal(4096); |
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var handle = NativeLibrary.Load("libHarfBuzzSharp", typeof(HarfBuzzSharp.Blob).Assembly, null); |
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dlinfo(handle, RTLD_DI_ORIGIN, libraryPathBytes); |
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var libraryOrigin = Marshal.PtrToStringUTF8(libraryPathBytes); |
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Marshal.FreeHGlobal(libraryPathBytes); |
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var libraryPath = Path.Combine(libraryOrigin, "libHarfBuzzSharp.so"); |
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NativeLibrary.Free(handle); |
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var forceLoadedHandle = dlopen(libraryPath, RTLD_NOW | RTLD_DEEPBIND); |
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if (forceLoadedHandle == IntPtr.Zero) |
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throw new DllNotFoundException($"Unable to load {libraryPath} via dlopen"); |
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NativeLibrary.SetDllImportResolver(typeof(HarfBuzzSharp.Blob).Assembly, (name, assembly, searchPath) => |
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{ |
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if (name.Contains("HarfBuzzSharp")) |
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return dlopen(libraryPath, RTLD_NOW | RTLD_DEEPBIND); |
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return NativeLibrary.Load(name, assembly, searchPath); |
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}); |
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} |
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} |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Media; |
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using ControlCatalog; |
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using ControlCatalog.Models; |
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using Gtk; |
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namespace XEmbedSample; |
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class Program |
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{ |
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static void Main(string[] args) |
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{ |
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HarfbuzzWorkaround.Apply(); |
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AppBuilder.Configure<App>() |
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.UseSkia() |
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.With(new X11PlatformOptions() |
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{ |
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UseGLibMainLoop = true, |
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ExterinalGLibMainLoopExceptionLogger = e => Console.WriteLine(e.ToString()) |
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}) |
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.UseX11() |
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.SetupWithoutStarting(); |
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App.SetCatalogThemes(CatalogTheme.Fluent); |
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Gdk.Global.AllowedBackends = "x11"; |
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Gtk.Application.Init("myapp", ref args); |
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var w = new Gtk.Window("XEmbed Test Window"); |
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var socket = new AvaloniaXEmbedGtkSocket(w.StyleContext.GetBackgroundColor(StateFlags.Normal)) |
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{ |
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Content = new ScrollViewer() |
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{ |
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Content = new ControlCatalog.Pages.TextBoxPage(), |
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HorizontalScrollBarVisibility = ScrollBarVisibility.Auto |
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} |
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}; |
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var vbox = new Gtk.Box(Gtk.Orientation.Vertical, 5); |
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var label = new Gtk.Label("Those are GTK controls"); |
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vbox.Add(label); |
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vbox.Add(new Gtk.Entry()); |
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vbox.Add(new Gtk.Button(new Gtk.Label("Do nothing"))); |
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vbox.PackEnd(socket, true, true, 0); |
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socket.HeightRequest = 400; |
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socket.WidthRequest = 400; |
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w.Add(vbox); |
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socket.Realize(); |
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w.AddSignalHandler("destroy", new EventHandler((_, __) => |
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{ |
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Gtk.Application.Quit(); |
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socket.Destroy(); |
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})); |
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w.ShowAll(); |
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Gtk.Application.Run(); |
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} |
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} |
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using Avalonia; |
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using Avalonia.X11; |
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using Gdk; |
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using Color = Cairo.Color; |
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namespace XEmbedSample; |
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public class AvaloniaXEmbedGtkSocket : Gtk.Socket |
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{ |
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private readonly RGBA _backgroundColor; |
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private XEmbedPlug? _avaloniaPlug; |
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public AvaloniaXEmbedGtkSocket(RGBA backgroundColor) |
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{ |
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_backgroundColor = backgroundColor; |
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} |
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private object _content; |
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public object Content |
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{ |
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get => _content; |
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set |
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{ |
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_content = value; |
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if (_avaloniaPlug != null) |
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_avaloniaPlug.Content = _content; |
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} |
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} |
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protected override void OnRealized() |
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{ |
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base.OnRealized(); |
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_avaloniaPlug ??= XEmbedPlug.Create(); |
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_avaloniaPlug.ScaleFactor = ScaleFactor; |
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_avaloniaPlug.BackgroundColor = Avalonia.Media.Color.FromRgb((byte)(_backgroundColor.Red * 255), |
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(byte)(_backgroundColor.Green * 255), |
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(byte)(_backgroundColor.Blue * 255) |
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); |
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_avaloniaPlug.Content = _content; |
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ApplyInteractiveResize(); |
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AddId((ulong)_avaloniaPlug.Handle); |
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} |
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void ApplyInteractiveResize() |
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{ |
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// This is _NOT_ a part of XEmbed, but allows us to have smooth resize
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GetAllocatedSize(out var rect, out _); |
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var scale = ScaleFactor; |
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_avaloniaPlug?.ProcessInteractiveResize(new PixelSize(rect.Width * scale, rect.Height * scale)); |
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} |
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protected override void OnSizeAllocated(Rectangle allocation) |
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{ |
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base.OnSizeAllocated(allocation); |
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Display.Default.Sync(); |
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ApplyInteractiveResize(); |
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} |
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protected override void OnDestroyed() |
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{ |
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_avaloniaPlug?.Dispose(); |
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_avaloniaPlug = null; |
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base.OnDestroyed(); |
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} |
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} |
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<Project Sdk="Microsoft.NET.Sdk"> |
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<PropertyGroup> |
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<OutputType>Exe</OutputType> |
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<TargetFramework>net6.0</TargetFramework> |
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<ImplicitUsings>enable</ImplicitUsings> |
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<Nullable>enable</Nullable> |
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks> |
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</PropertyGroup> |
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<ItemGroup> |
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<PackageReference Include="GtkSharp" Version="3.24.24.95" /> |
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</ItemGroup> |
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<ItemGroup> |
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<ProjectReference Include="..\..\src\Avalonia.X11\Avalonia.X11.csproj" /> |
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<ProjectReference Include="..\ControlCatalog\ControlCatalog.csproj" /> |
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</ItemGroup> |
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</Project> |
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using Avalonia.Threading; |
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namespace Avalonia.X11.Dispatching; |
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interface IX11PlatformDispatcher : IDispatcherImpl |
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{ |
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X11EventDispatcher EventDispatcher { get; } |
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} |
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using System; |
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namespace Avalonia.X11; |
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using static XLib; |
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partial class X11Window |
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{ |
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public class DefaultTopLevelWindowMode : X11WindowMode |
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{ |
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public override void Activate() |
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{ |
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if (X11.Atoms._NET_ACTIVE_WINDOW != IntPtr.Zero) |
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{ |
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Window.SendNetWMMessage(X11.Atoms._NET_ACTIVE_WINDOW, (IntPtr)1, X11.LastActivityTimestamp, |
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IntPtr.Zero); |
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} |
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else |
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{ |
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XRaiseWindow(X11.Display, Handle); |
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OnManualXRaiseWindow(); |
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} |
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base.Activate(); |
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} |
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protected virtual void OnManualXRaiseWindow() |
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{ |
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} |
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public override void Show(bool activate, bool isDialog) |
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{ |
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Window._wasMappedAtLeastOnce = true; |
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XMapWindow(X11.Display, Handle); |
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XFlush(X11.Display); |
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base.Show(activate, isDialog); |
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} |
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public override void Hide() |
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{ |
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XUnmapWindow(X11.Display, Handle); |
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base.Hide(); |
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} |
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public override Point PointToClient(PixelPoint point) => new Point( |
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(point.X - (Window._position ?? default).X) / Window.RenderScaling, |
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(point.Y - (Window._position ?? default).Y) / Window.RenderScaling); |
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public override PixelPoint PointToScreen(Point point) => new PixelPoint( |
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(int)(point.X * Window.RenderScaling + (Window._position ?? default).X), |
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(int)(point.Y * Window.RenderScaling + (Window._position ?? default).Y)); |
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} |
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} |
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using System; |
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using System.Collections.Generic; |
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namespace Avalonia.X11; |
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using static XLib; |
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partial class X11Window |
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{ |
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public class InputProxyWindowMode : DefaultTopLevelWindowMode |
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{ |
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private X11FocusProxy _focusProxy; |
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public override void OnHandleCreated(IntPtr handle) |
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{ |
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_focusProxy = new X11FocusProxy(Platform, handle, OnFocusProxyEvent); |
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Window.SetWmClass(_focusProxy._handle, "FocusProxy"); |
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base.OnHandleCreated(handle); |
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} |
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public override bool OnEvent(ref XEvent ev) |
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{ |
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if (ev.type == XEventName.ClientMessage && ev.ClientMessageEvent.ptr1 == X11.Atoms.WM_TAKE_FOCUS) |
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{ |
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XSetInputFocus(X11.Display, _focusProxy!._handle, RevertTo.Parent, ev.ClientMessageEvent.ptr2); |
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} |
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return base.OnEvent(ref ev); |
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} |
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void OnFocusProxyEvent(ref XEvent xev) |
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{ |
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} |
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protected override void OnManualXRaiseWindow() |
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{ |
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if (_focusProxy is not null) |
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XSetInputFocus(X11.Display, _focusProxy._handle, 0, IntPtr.Zero); |
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base.OnManualXRaiseWindow(); |
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} |
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public override void OnDestroyNotify() |
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{ |
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_focusProxy?.Cleanup(); |
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_focusProxy = null; |
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base.OnDestroyNotify(); |
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} |
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public override void AppendWmProtocols(List<IntPtr> data) |
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{ |
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data.Add(X11.Atoms.WM_TAKE_FOCUS); |
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base.AppendWmProtocols(data); |
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} |
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} |
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} |
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using System; |
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using System.Collections.Generic; |
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namespace Avalonia.X11; |
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partial class X11Window |
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{ |
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public abstract class X11WindowMode |
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{ |
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public X11Window Window { get; private set; } |
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protected IntPtr Display; |
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protected X11Info X11; |
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protected AvaloniaX11Platform Platform; |
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protected IntPtr Handle => Window._handle; |
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protected IntPtr RenderHandle => Window._renderHandle; |
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public virtual bool BlockInput => false; |
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public void Init(X11Window window) |
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{ |
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Platform = window._platform; |
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Display = window._platform.Display; |
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X11 = window._platform.Info; |
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Window = window; |
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} |
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public virtual bool OnEvent(ref XEvent ev) |
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{ |
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return false; |
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} |
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public virtual void Activate() |
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{ |
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} |
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public virtual void OnHandleCreated(IntPtr handle) |
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{ |
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} |
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public virtual void OnDestroyNotify() |
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{ |
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} |
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public virtual void AppendWmProtocols(List<IntPtr> data) |
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{ |
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} |
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public virtual void Show(bool activate, bool isDialog) |
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{ |
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} |
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public abstract PixelPoint PointToScreen(Point pt); |
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public abstract Point PointToClient(PixelPoint pt); |
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public virtual void Hide() |
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{ |
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} |
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} |
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} |
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#nullable enable |
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using System; |
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using System.ComponentModel; |
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using Avalonia.Controls; |
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using Avalonia.Controls.Embedding; |
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using Avalonia.Input; |
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namespace Avalonia.X11; |
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using static XLib; |
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partial class X11Window |
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{ |
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public class XEmbedClientWindowMode : X11WindowMode |
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{ |
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EmbeddableControlRoot? Root => Window._inputRoot as EmbeddableControlRoot; |
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private bool _focusedInEmbedder; |
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private bool _embedderActivated; |
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private bool _disabled; |
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private IntPtr _currentEmbedder; |
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private bool _suppressConfigureEvents; |
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public override bool BlockInput => _disabled; |
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public double Scaling |
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{ |
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get => Window._scalingOverride ?? 1; |
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set => Window._scalingOverride = value; |
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} |
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private WeakReference<IInputElement>? _savedFocus; |
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private IInputElement? SavedFocus |
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{ |
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get => _savedFocus?.TryGetTarget(out var target) == true ? target : null; |
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set => _savedFocus = value == null ? null : new WeakReference<IInputElement>(value); |
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} |
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public override void OnHandleCreated(IntPtr handle) |
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{ |
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var data = new[] |
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{ |
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IntPtr.Zero, new(1) /* XEMBED_MAPPED */ |
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}; |
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XChangeProperty(Display, handle, X11.Atoms._XEMBED_INFO, X11.Atoms._XEMBED_INFO, 32, PropertyMode.Replace, |
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data, data.Length); |
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Scaling = 1; |
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base.OnHandleCreated(handle); |
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} |
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void SendXEmbedMessage(XEmbedMessage message, IntPtr detail = default, IntPtr data1 = default, IntPtr data2 = default) |
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{ |
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if (_currentEmbedder == IntPtr.Zero) |
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return; |
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var xev = new XEvent |
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{ |
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ClientMessageEvent = |
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{ |
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type = XEventName.ClientMessage, |
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send_event = 1, |
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window = _currentEmbedder, |
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message_type = X11.Atoms._XEMBED, |
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format = 32, |
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ptr1 = default, |
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ptr2 = new ((int)message), |
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ptr3 = detail, |
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ptr4 = data1, |
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ptr5 = data2 |
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} |
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}; |
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XSendEvent(X11.Display, _currentEmbedder, false, |
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new IntPtr((int)(EventMask.NoEventMask)), ref xev); |
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} |
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static XEmbedClientWindowMode() |
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{ |
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KeyboardDevice.Instance.PropertyChanged += (_, args) => |
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{ |
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if (args.PropertyName == nameof(KeyboardDevice.Instance.FocusedElement)) |
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{ |
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if (KeyboardDevice.Instance.FocusedElement is Visual visual |
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&& visual.VisualRoot is EmbeddableControlRoot root |
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&& root.PlatformImpl is X11Window window |
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&& window._mode is XEmbedClientWindowMode xembedMode |
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&& xembedMode._currentEmbedder != IntPtr.Zero) |
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{ |
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xembedMode.SavedFocus = KeyboardDevice.Instance.FocusedElement; |
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xembedMode.SendXEmbedMessage(XEmbedMessage.RequestFocus); |
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} |
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} |
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}; |
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} |
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void Reset() |
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{ |
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_embedderActivated = false; |
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_focusedInEmbedder = false; |
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_disabled = false; |
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UpdateActivation(); |
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} |
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void OnXEmbedMessage(IntPtr time, XEmbedMessage message, IntPtr detail, IntPtr data1, IntPtr data2) |
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{ |
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if (message == XEmbedMessage.EmbeddedNotify) |
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{ |
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Reset(); |
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_currentEmbedder = data1; |
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} |
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else if (message == XEmbedMessage.FocusIn) |
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{ |
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_focusedInEmbedder = true; |
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UpdateActivation(); |
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} |
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else if (message == XEmbedMessage.FocusOut) |
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{ |
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_focusedInEmbedder = false; |
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UpdateActivation(); |
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} |
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else if (message == XEmbedMessage.WindowActivate) |
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{ |
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_embedderActivated = true; |
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UpdateActivation(); |
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} |
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else if (message == XEmbedMessage.WindowDeactivate) |
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{ |
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_embedderActivated = false; |
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UpdateActivation(); |
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} |
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else if (message == XEmbedMessage.ModalityOn) |
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_disabled = true; |
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else if (message == XEmbedMessage.ModalityOff) |
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_disabled = false; |
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} |
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private void UpdateActivation() |
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{ |
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var active = _focusedInEmbedder && _embedderActivated; |
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if (active) |
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{ |
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((FocusManager?)Root?.FocusManager)?.SetFocusScope(Root); |
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SavedFocus?.Focus(); |
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SavedFocus = null; |
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} |
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else |
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{ |
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SavedFocus = Root?.IsKeyboardFocusWithin == true ? Root.FocusManager?.GetFocusedElement() : null; |
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Window.LostFocus?.Invoke(); |
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} |
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} |
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public override bool OnEvent(ref XEvent ev) |
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{ |
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// In this mode we are getting the expected size directly from the embedder
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if (_suppressConfigureEvents && ev.type == XEventName.ConfigureNotify) |
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return true; |
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if(ev.type == XEventName.MapNotify) |
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Root?.StartRendering(); |
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else if (ev.type == XEventName.UnmapNotify) |
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Root?.StopRendering(); |
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else if (ev.type == XEventName.ReparentNotify) |
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{ |
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Root?.StopRendering(); |
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_currentEmbedder = IntPtr.Zero; |
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Reset(); |
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} |
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else if (ev.type == XEventName.ClientMessage && ev.ClientMessageEvent.message_type == X11.Atoms._XEMBED) |
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{ |
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OnXEmbedMessage(ev.ClientMessageEvent.ptr1, |
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(XEmbedMessage)ev.ClientMessageEvent.ptr2.ToInt32(), |
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ev.ClientMessageEvent.ptr3, |
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ev.ClientMessageEvent.ptr4, ev.ClientMessageEvent.ptr5); |
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return true; |
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} |
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return base.OnEvent(ref ev); |
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} |
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public void ProcessInteractiveResize(PixelSize size) |
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{ |
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_suppressConfigureEvents = true; |
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Window._realSize = size; |
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Window.Resized?.Invoke(Window.ClientSize, WindowResizeReason.User); |
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Window.Paint?.Invoke(new(Window.ClientSize)); |
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} |
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PixelVector GetWindowOffset() |
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{ |
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XTranslateCoordinates(Display, Handle, X11.DefaultRootWindow, |
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0, 0, out var offsetX, out var offsetY, out _); |
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return new PixelVector(offsetX, offsetY); |
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} |
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|
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public override Point PointToClient(PixelPoint point) |
|||
{ |
|||
var pos = GetWindowOffset(); |
|||
return new Point( |
|||
(point.X - pos.X) / Window.RenderScaling, |
|||
(point.Y - pos.Y) / Window.RenderScaling); |
|||
} |
|||
|
|||
public override PixelPoint PointToScreen(Point point) => |
|||
new PixelPoint( |
|||
(int)(point.X * Window.RenderScaling), |
|||
(int)(point.Y * Window.RenderScaling)) |
|||
+ GetWindowOffset(); |
|||
} |
|||
} |
|||
@ -0,0 +1,81 @@ |
|||
using System; |
|||
using System.Threading; |
|||
using Avalonia.Controls.Embedding; |
|||
using Avalonia.Media; |
|||
using Avalonia.Threading; |
|||
using Avalonia.X11.Dispatching; |
|||
|
|||
namespace Avalonia.X11; |
|||
|
|||
public class XEmbedPlug : IDisposable |
|||
{ |
|||
private EmbeddableControlRoot _root; |
|||
private Color _backgroundColor; |
|||
private readonly X11Info _x11; |
|||
private readonly X11Window.XEmbedClientWindowMode _mode; |
|||
|
|||
private XEmbedPlug(IntPtr? parentXid) |
|||
{ |
|||
var platform = AvaloniaLocator.Current.GetService<AvaloniaX11Platform>(); |
|||
_mode = new X11Window.XEmbedClientWindowMode(); |
|||
_root = new EmbeddableControlRoot(new X11Window(platform, null, _mode)); |
|||
_root.Prepare(); |
|||
_x11 = platform.Info; |
|||
if (parentXid.HasValue) |
|||
XLib.XReparentWindow(platform.Display, Handle, parentXid.Value, 0, 0); |
|||
|
|||
// Make sure that the newly created XID is visible for other clients
|
|||
XLib.XSync(platform.Display, false); |
|||
} |
|||
|
|||
public IntPtr Handle => |
|||
_root?.PlatformImpl!.Handle!.Handle ?? throw new ObjectDisposedException(nameof(XEmbedPlug)); |
|||
|
|||
public object Content |
|||
{ |
|||
get => _root.Content; |
|||
set => _root.Content = value; |
|||
} |
|||
|
|||
public Color BackgroundColor |
|||
{ |
|||
get => _backgroundColor; |
|||
set |
|||
{ |
|||
_backgroundColor = value; |
|||
XLib.XSetWindowBackground(_x11.Display, Handle, new IntPtr( |
|||
(int)(value.ToUInt32() | 0xff000000))); |
|||
XLib.XFlush(_x11.Display); |
|||
} |
|||
} |
|||
|
|||
public double ScaleFactor |
|||
{ |
|||
get => _mode.Scaling; |
|||
set => _mode.Scaling = value; |
|||
} |
|||
|
|||
public void ProcessInteractiveResize(PixelSize size) |
|||
{ |
|||
|
|||
var events = (IX11PlatformDispatcher)AvaloniaLocator.Current.GetService<IDispatcherImpl>(); |
|||
events.EventDispatcher.DispatchX11Events(CancellationToken.None); |
|||
_mode.ProcessInteractiveResize(size); |
|||
Dispatcher.UIThread.RunJobs(DispatcherPriority.UiThreadRender); |
|||
} |
|||
|
|||
public void Dispose() |
|||
{ |
|||
if (_root != null) |
|||
{ |
|||
_root.StopRendering(); |
|||
_root.Dispose(); |
|||
_root = null; |
|||
} |
|||
} |
|||
|
|||
public static XEmbedPlug Create() => new(null); |
|||
|
|||
public static XEmbedPlug Create(IntPtr embedderXid) => |
|||
embedderXid == IntPtr.Zero ? throw new ArgumentException() : new XEmbedPlug(embedderXid); |
|||
} |
|||
Loading…
Reference in new issue