add x11 allowed actions atom

src/Avalonia.X11/X11Atoms.cs

@@ -179,6 +179,16 @@ namespace Avalonia.X11
         public IntPtr _NET_WM_WINDOW_TYPE_SPLASH;
         public IntPtr _NET_WM_WINDOW_TYPE_DIALOG;
         public IntPtr _NET_WM_WINDOW_TYPE_NORMAL;
+        public IntPtr _NET_WM_ACTION_MOVE;
+        public IntPtr _NET_WM_ACTION_RESIZE;
+        public IntPtr _NET_WM_ACTION_MINIMIZE;
+        public IntPtr _NET_WM_ACTION_SHADE;
+        public IntPtr _NET_WM_ACTION_STICK;
+        public IntPtr _NET_WM_ACTION_MAXIMIZE_HORZ;
+        public IntPtr _NET_WM_ACTION_MAXIMIZE_VERT;
+        public IntPtr _NET_WM_ACTION_FULLSCREEN;
+        public IntPtr _NET_WM_ACTION_CHANGE_DESKTOP;
+        public IntPtr _NET_WM_ACTION_CLOSE;
         public IntPtr CLIPBOARD;
         public IntPtr CLIPBOARD_MANAGER;
         public IntPtr SAVE_TARGETS;

src/Avalonia.X11/X11Window.cs

@@ -567,7 +567,7 @@ namespace Avalonia.X11
                 {
                     if (ev.ClientMessageEvent.ptr1 == _x11.Atoms.WM_DELETE_WINDOW)
                     {
-                        if (Closing?.Invoke(WindowCloseReason.WindowClosing) != true)
+                        if (!_disabled && Closing?.Invoke(WindowCloseReason.WindowClosing) != true)
                             Dispose();
                     }
                     else if (ev.ClientMessageEvent.ptr1 == _x11.Atoms._NET_WM_SYNC_REQUEST)
@@ -1298,6 +1298,8 @@ namespace Avalonia.X11
             {
                 XFree(wmHintsPtr);
             }
+
+            UpdateNetAllowedActions();
         }
 
         public void SetExtendClientAreaToDecorationsHint(bool extendIntoClientAreaHint)
@@ -1369,6 +1371,34 @@ namespace Avalonia.X11
             );
         }
 
+        private void UpdateNetAllowedActions()
+        {
+            var allowedActions = new HashSet<IntPtr>()
+            {
+                _x11.Atoms._NET_WM_ACTION_MOVE,
+                _x11.Atoms._NET_WM_ACTION_RESIZE,
+                _x11.Atoms._NET_WM_ACTION_MINIMIZE,
+                _x11.Atoms._NET_WM_ACTION_SHADE,
+                _x11.Atoms._NET_WM_ACTION_STICK,
+                _x11.Atoms._NET_WM_ACTION_MAXIMIZE_HORZ,
+                _x11.Atoms._NET_WM_ACTION_MAXIMIZE_VERT,
+                _x11.Atoms._NET_WM_ACTION_FULLSCREEN,
+                _x11.Atoms._NET_WM_ACTION_CHANGE_DESKTOP,
+                _x11.Atoms._NET_WM_ACTION_CLOSE,
+            };
+
+            if(_disabled)
+            {
+                allowedActions.Remove(_x11.Atoms._NET_WM_ACTION_MINIMIZE);
+                allowedActions.Remove(_x11.Atoms._NET_WM_ACTION_MAXIMIZE_HORZ);
+                allowedActions.Remove(_x11.Atoms._NET_WM_ACTION_MAXIMIZE_VERT);
+                allowedActions.Remove(_x11.Atoms._NET_WM_ACTION_CLOSE);
+            }
+
+            XChangeProperty(_x11.Display, _handle, _x11.Atoms._NET_WM_ALLOWED_ACTIONS, (IntPtr)Atom.XA_ATOM, 32,
+                PropertyMode.Replace, allowedActions.ToArray(), allowedActions.Count);
+        }
+
         public IPopupPositioner? PopupPositioner { get; }
 
         public void SetTransparencyLevelHint(IReadOnlyList<WindowTransparencyLevel> transparencyLevels)