Detect window deletion

example/window.dart

@@ -4,7 +4,10 @@ void main() async {
   var client = X11Client();
   await client.connect();
 
-  client.eventStream.listen((event) {
+  var wmProtocolsAtom = await client.internAtom('WM_PROTOCOLS');
+  var wmDeleteWindowAtom = await client.internAtom('WM_DELETE_WINDOW');
+
+  client.eventStream.listen((event) async {
     if (event is X11KeyPressEvent) {
       print('KeyPress ${event.key}');
     } else if (event is X11KeyReleaseEvent) {
@@ -25,6 +28,12 @@ void main() async {
       print('FocusOut');
     } else if (event is X11ExposeEvent) {
       client.clearArea(event.window, event.area);
+    } else if (event is X11ClientMessageEvent) {
+      if (event.type == wmProtocolsAtom) {
+        if (X11Atom(event.data[0]) == wmDeleteWindowAtom) {
+          await client.close();
+        }
+      }
     }
   });
 
@@ -43,6 +52,12 @@ void main() async {
         X11EventType.focusChange
       },
       backgroundPixel: 0x00000000);
+
+  // Set window title.
   await client.changePropertyString(id, 'WM_NAME', 'x11.dart');
+
+  // Make able to detect when window is closed.
+  await client.changePropertyAtom(id, 'WM_PROTOCOLS', ['WM_DELETE_WINDOW']);
+
   client.mapWindow(id);
 }

lib/src/x11_client.dart

@@ -662,10 +662,14 @@ class X11Client {
 
   /// Changes a [property] of [window] to [value].
   Future<int> changePropertyAtom(
-      X11ResourceId window, String property, String value,
+      X11ResourceId window, String property, List<String> value,
       {X11ChangePropertyMode mode = X11ChangePropertyMode.replace}) async {
-    var valueAtom = await internAtom(value);
-    return await changePropertyUint32(window, property, [valueAtom.value],
+    var valueAtoms = <int>[];
+    for (var name in value) {
+      var atom = await internAtom(name);
+      valueAtoms.add(atom.value);
+    }
+    return await changePropertyUint32(window, property, valueAtoms,
         type: 'ATOM', mode: mode);
   }
 
@@ -1946,7 +1950,8 @@ class X11Client {
         }
       }
     } else {
-      var code = reply;
+      //var fromSendEvent = reply & 0x80 != 0;
+      var code = reply & 0x7f;
       var eventBuffer = X11ReadBuffer();
       eventBuffer.add(_buffer.readUint8());
       _buffer.readUint16(); // FIXME(robert-ancell): sequenceNumber
@@ -2016,8 +2021,8 @@ class X11Client {
         event = X11SelectionNotifyEvent.fromBuffer(eventBuffer);
       } else if (code == 32) {
         event = X11ColormapNotifyEvent.fromBuffer(eventBuffer);
-        /*} else if (code == 33) {
-        event = X11ClientMessageEvent.fromBuffer(eventBuffer);*/
+      } else if (code == 33) {
+        event = X11ClientMessageEvent.fromBuffer(eventBuffer);
       } else if (code == 34) {
         event = X11MappingNotifyEvent.fromBuffer(eventBuffer);
       }

lib/src/x11_events.dart

@@ -1165,31 +1165,59 @@ class X11ColormapNotifyEvent extends X11Event {
   }
 }
 
-/*class X11ClientMessageEvent extends X11Event {
+class X11ClientMessageEvent extends X11Event {
   final int format;
   final X11ResourceId window;
   final X11Atom type;
-  final ?ClientMessageData? data;
+  final List<int> data;
 
-  X11ClientMessageEvent(this.format, this.window, this.type, this.data);
+  X11ClientMessageEvent.uint8(this.window, this.type, this.data) : format = 8 {
+    assert(data.length == 20);
+  }
+
+  X11ClientMessageEvent.uint16(this.window, this.type, this.data)
+      : format = 16 {
+    assert(data.length == 10);
+  }
+
+  X11ClientMessageEvent.uint32(this.window, this.type, this.data)
+      : format = 32 {
+    assert(data.length == 5);
+  }
 
   factory X11ClientMessageEvent.fromBuffer(X11ReadBuffer buffer) {
     var format = buffer.readUint8();
     var window = buffer.readResourceId();
     var type = buffer.readAtom();
-    var data = buffer.read?ClientMessageData?();
-    return X11ClientMessageEvent(format, window, type, data);
+    if (format == 8) {
+      return X11ClientMessageEvent.uint8(
+          window, type, buffer.readListOfUint8(20));
+    } else if (format == 16) {
+      return X11ClientMessageEvent.uint16(
+          window, type, buffer.readListOfUint16(10));
+    } else if (format == 32) {
+      return X11ClientMessageEvent.uint32(
+          window, type, buffer.readListOfUint32(5));
+    } else {
+      throw Exception('Invalid ClientMessage format $format');
+    }
   }
 
   @override
   int encode(X11WriteBuffer buffer) {
     buffer.writeUint8(format);
     buffer.writeResourceId(window);
     buffer.writeAtom(type);
-    buffer.write?ClientMessageData?(data);
+    if (format == 8) {
+      buffer.writeListOfUint8(data);
+    } else if (format == 16) {
+      buffer.writeListOfUint16(data);
+    } else if (format == 32) {
+      buffer.writeListOfUint32(data);
+    }
     return 33;
   }
-}*/
+}
 
 class X11MappingNotifyEvent extends X11Event {
   final int request;

lib/src/x11_types.dart

@@ -376,6 +376,9 @@ class X11Atom {
 
   @override
   String toString() => 'X11Atom($value)';
+
+  @override
+  bool operator ==(other) => other is X11Atom && other.value == value;
 }
 
 class X11CharacterInfo {