Merge pull request #10919 from AvaloniaUI/x11-disable-input

X11 - Prevent window from receiving input when disabled

src/Avalonia.X11/X11Window.cs

@@ -24,6 +24,7 @@ using Avalonia.X11.Glx;
 using Avalonia.X11.NativeDialogs;
 using static Avalonia.X11.XLib;
 using Avalonia.Input.Platform;
+using System.Runtime.InteropServices;
 // ReSharper disable IdentifierTypo
 // ReSharper disable StringLiteralTypo
 
@@ -737,6 +738,10 @@ namespace Avalonia.X11
         {
             if (_inputRoot is null)
                 return;
+
+            if (_disabled && args is RawPointerEventArgs pargs && pargs.Type == RawPointerEventType.Move)
+                return;
+
             Input?.Invoke(args);
             if (!args.Handled && args is RawKeyEventArgsWithText text && !string.IsNullOrEmpty(text.Text))
                 Input?.Invoke(new RawTextInputEventArgs(_keyboard, args.Timestamp, _inputRoot, text.Text));
@@ -1203,6 +1208,32 @@ namespace Avalonia.X11
         public void SetEnabled(bool enable)
         {
             _disabled = !enable;
+
+            UpdateWMHints();
+        }
+
+        private void UpdateWMHints()
+        {
+            var wmHintsPtr = XGetWMHints(_x11.Display, _handle);
+
+            XWMHints hints = default;
+
+            if (wmHintsPtr != IntPtr.Zero)
+            {
+                hints = Marshal.PtrToStructure<XWMHints>(wmHintsPtr);
+            }
+
+            var flags = hints.flags.ToInt64();
+            flags |= (long)XWMHintsFlags.InputHint;
+            hints.flags = (IntPtr)flags;
+            hints.input = !_disabled ? 1 : 0;
+
+            XSetWMHints(_x11.Display, _handle, ref hints);
+
+            if (wmHintsPtr != IntPtr.Zero)
+            {
+                XFree(wmHintsPtr);
+            }
         }
 
         public void SetExtendClientAreaToDecorationsHint(bool extendIntoClientAreaHint)
@@ -1292,6 +1323,8 @@ namespace Avalonia.X11
 
         public bool NeedsManagedDecorations => false;
 
+        public bool IsEnabled => !_disabled;
+
         public class SurfacePlatformHandle : IPlatformNativeSurfaceHandle
         {
             private readonly X11Window _owner;

src/Avalonia.X11/XI2Manager.cs

@@ -231,7 +231,7 @@ namespace Avalonia.X11
                 return;
             }
 
-            if (_multitouch && ev.Emulated)
+            if (!client.IsEnabled || (_multitouch && ev.Emulated))
                 return;
             
             if (ev.Type == XiEventType.XI_Motion)
@@ -370,6 +370,7 @@ namespace Avalonia.X11
 
     internal interface IXI2Client
     {
+        bool IsEnabled { get; }
         IInputRoot InputRoot { get; }
         void ScheduleXI2Input(RawInputEventArgs args);
         IMouseDevice MouseDevice { get; }

src/Avalonia.X11/XLib.cs

@@ -375,6 +375,9 @@ namespace Avalonia.X11
         [DllImport(libX11)]
         public static extern void XSetWMHints(IntPtr display, IntPtr window, ref XWMHints wmhints);
 
+        [DllImport(libX11)]
+        public static extern IntPtr XGetWMHints(IntPtr display, IntPtr window);
+
         [DllImport(libX11)]
         public static extern int XGetIconSizes(IntPtr display, IntPtr window, out IntPtr size_list, out int count);