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Implement click-through windows for X11 (Linux) (#106)

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* Implement click-through windows for X11

* Adjust the "platform specific" comment

* Get rid of accidental whitespace

* Move else declaration into next line
This commit is contained in:
Maximilian Dorn 2023-03-01 20:52:47 +01:00 committed by GitHub
parent 3f2f11bdf3
commit 5ada0e41d8
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1 changed files with 45 additions and 1 deletions
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46
ObservatoryCore/UI/Views/NotificationView.axaml.cs
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@ -4,6 +4,7 @@ using Avalonia.Layout;
using Avalonia.Markup.Xaml; using Avalonia.Markup.Xaml;
using Observatory.UI.ViewModels; using Observatory.UI.ViewModels;
using System; using System;
using System.Reflection;
using System.Timers; using System.Timers;
using System.Runtime.InteropServices; using System.Runtime.InteropServices;
@ -27,7 +28,7 @@ namespace Observatory.UI.Views
SystemDecorations = SystemDecorations.None; SystemDecorations = SystemDecorations.None;
ShowActivated = false; ShowActivated = false;
ShowInTaskbar = false; ShowInTaskbar = false;
MakeClickThrough(); //Platform specific, currently windows only. MakeClickThrough(); //Platform specific, currently windows and Linux (X11) only.
this.DataContextChanged += NotificationView_DataContextChanged; this.DataContextChanged += NotificationView_DataContextChanged;
scale = Properties.Core.Default.NativeNotifyScale / 100.0; scale = Properties.Core.Default.NativeNotifyScale / 100.0;
@ -191,6 +192,38 @@ namespace Observatory.UI.Views
//PlatformImpl not part of formal Avalonia API and may not be available in future versions. //PlatformImpl not part of formal Avalonia API and may not be available in future versions.
SetWindowLong(this.PlatformImpl.Handle.Handle, GWL_EXSTYLE, style | WS_EX_LAYERED | WS_EX_TRANSPARENT); SetWindowLong(this.PlatformImpl.Handle.Handle, GWL_EXSTYLE, style | WS_EX_LAYERED | WS_EX_TRANSPARENT);
SetLayeredWindowAttributes(this.PlatformImpl.Handle.Handle, 0, 255, LWA_ALPHA); SetLayeredWindowAttributes(this.PlatformImpl.Handle.Handle, 0, 255, LWA_ALPHA);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
// X11 stuff is not part of official API, we'll have to deal with reflection
// This solution currently only supports the X11 window system which is used on most systems
var type = this.PlatformImpl.GetType();
if (type.FullName is not "Avalonia.X11.X11Window") return;
// Get the pointer to the X11 window
var handlePropInfo = type.GetField("_handle", BindingFlags.NonPublic | BindingFlags.Instance);
var handle = handlePropInfo?.GetValue(this.PlatformImpl);
// Get the X11Info instance
var x11PropInfo = type.GetField("_x11", BindingFlags.NonPublic | BindingFlags.Instance);
var x11Info = x11PropInfo?.GetValue(this.PlatformImpl);
// Get the pointer to the X11 display
var displayPropInfo = x11Info?.GetType().GetProperty("Display");
var display = displayPropInfo?.GetValue(x11Info);
if (display == null || handle == null) return;
try
{
// Create a very tiny region
var region = XFixesCreateRegion((IntPtr)display, IntPtr.Zero, 0);
// Set the input shape of the window to our region
XFixesSetWindowShapeRegion((IntPtr)display, (IntPtr)handle, ShapeInput, 0, 0, region);
// Cleanup
XFixesDestroyRegion((IntPtr)display, region);
}
catch (DllNotFoundException ignored)
{
// libXfixes is not installed for some reason
}
} }
} }
@ -207,5 +240,16 @@ namespace Observatory.UI.Views
internal const int WS_EX_LAYERED = 0x80000; internal const int WS_EX_LAYERED = 0x80000;
internal const int LWA_ALPHA = 0x2; internal const int LWA_ALPHA = 0x2;
internal const int WS_EX_TRANSPARENT = 0x00000020; internal const int WS_EX_TRANSPARENT = 0x00000020;
[DllImport("libXfixes.so")]
static extern IntPtr XFixesCreateRegion(IntPtr dpy, IntPtr rectangles, int nrectangles);
[DllImport("libXfixes.so")]
static extern IntPtr XFixesSetWindowShapeRegion(IntPtr dpy, IntPtr win, int shape_kind, int x_off, int y_off, IntPtr region);
[DllImport("libXfixes.so")]
static extern IntPtr XFixesDestroyRegion(IntPtr dpy, IntPtr region);
internal const int ShapeInput = 2;
} }
} }