xevent to update clipboard.

internal/desktop/xevent.go

@@ -8,6 +8,10 @@ func (manager *DesktopManagerCtx) OnCursorChanged(listener func(serial uint64))
 	xevent.OnCursorChanged(listener)
 }
 
+func (manager *DesktopManagerCtx) OnClipboardUpdated(listener func()) {
+	xevent.OnClipboardUpdated(listener)
+}
+
 func (manager *DesktopManagerCtx) OnEventError(listener func(error_code uint8, message string, request_code uint8, minor_code uint8)) {
 	xevent.OnEventError(listener)
 }

internal/desktop/xevent/xevent.c

@@ -23,7 +23,11 @@ void XEventLoop(char *name) {
     return;
   }
 
+  Atom XA_CLIPBOARD;
+  XA_CLIPBOARD = XInternAtom(display, "CLIPBOARD", 0);
+  XFixesSelectSelectionInput(display, root, XA_CLIPBOARD, XFixesSetSelectionOwnerNotifyMask);
   XFixesSelectCursorInput(display, root, XFixesDisplayCursorNotifyMask);
+
   XSync(display, 0);
   XSetErrorHandler(XEventError);
 
@@ -39,6 +43,15 @@ void XEventLoop(char *name) {
         continue;
       }
     }
+
+    // XFixesSelectionNotifyEvent
+    if (event.type == xfixes_event_base + XFixesSelectionNotify) {
+      XFixesSelectionNotifyEvent notifyEvent = *((XFixesSelectionNotifyEvent *) &event);
+      if (notifyEvent.subtype == XFixesSetSelectionOwnerNotify && notifyEvent.selection == XA_CLIPBOARD) {
+        goXEventClipboardUpdated();
+        continue;
+      }
+    }
   }
 
   XCloseDisplay(display);

internal/desktop/xevent/xevent.go

@@ -33,6 +33,12 @@ func OnCursorChanged(listener func(serial uint64)) {
 	})
 }
 
+func OnClipboardUpdated(listener func()) {
+	emmiter.On("clipboard-updated", func(payload ...interface{}) {
+		listener()
+	})
+}
+
 func OnEventError(listener func(error_code uint8, message string, request_code uint8, minor_code uint8)) {
 	emmiter.On("event-error", func(payload ...interface{}) {
 		listener(payload[0].(uint8), payload[1].(string), payload[2].(uint8), payload[3].(uint8))
@@ -44,6 +50,11 @@ func goXEventCursorChanged(event C.XFixesCursorNotifyEvent) {
 	emmiter.Emit("cursor-changed", uint64(event.cursor_serial))
 }
 
+//export goXEventClipboardUpdated
+func goXEventClipboardUpdated() {
+	emmiter.Emit("clipboard-updated")
+}
+
 //export goXEventError
 func goXEventError(event *C.XErrorEvent, message *C.char) {
 	emmiter.Emit("event-error", uint8(event.error_code), C.GoString(message), uint8(event.request_code), uint8(event.minor_code))

internal/desktop/xevent/xevent.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/Xfixes.h>
 #include <stdint.h>
@@ -7,6 +8,7 @@
 #include <string.h>
 
 extern void goXEventCursorChanged(XFixesCursorNotifyEvent event);
+extern void goXEventClipboardUpdated();
 extern void goXEventError(XErrorEvent *event, char *message);
 extern int goXEventActive();
 

internal/types/desktop.go

@@ -44,6 +44,7 @@ type DesktopManager interface {
 
 	// xevent
 	OnCursorChanged(listener func(serial uint64))
+	OnClipboardUpdated(listener func())
 	OnEventError(listener func(error_code uint8, message string, request_code uint8, minor_code uint8))
 
 	// clipboard

internal/websocket/manager.go

@@ -47,7 +47,6 @@ type WebSocketManagerCtx struct {
 	desktop   types.DesktopManager
 	handler   *handler.MessageHandlerCtx
 	handlers  []types.HandlerFunction
-	shutdown  chan bool
 }
 
 func (ws *WebSocketManagerCtx) Start() {
@@ -118,51 +117,25 @@ func (ws *WebSocketManagerCtx) Start() {
 		}, nil)
 	})
 
-	go func() {
-		ws.logger.Info().Msg("clipboard loop started")
-
-		defer func() {
-			ws.logger.Info().Msg("clipboard loop stopped")
-		}()
-
-		current := ws.desktop.ReadClipboard()
-
-		for {
-			select {
-			case <-ws.shutdown:
-				return
-			default:
-				session := ws.sessions.GetHost()
-				if session == nil {
-					break
-				}
-
-				text := ws.desktop.ReadClipboard()
-				if text == current {
-					break
-				}
-
-				current = text
-				if !session.CanAccessClipboard() {
-					break
-				}
-
-				if err := session.Send(
-					message.ClipboardData{
-						Event: event.CLIPBOARD_UPDATED,
-						Text:  text,
-					}); err != nil {
-					ws.logger.Warn().Err(err).Msg("could not sync clipboard")
-				}
-			}
-
-			time.Sleep(100 * time.Millisecond)
+	ws.desktop.OnClipboardUpdated(func() {
+		session := ws.sessions.GetHost()
+		if session == nil || !session.CanAccessClipboard() {
+			return
 		}
-	}()
+
+		text := ws.desktop.ReadClipboard()
+		err := session.Send(message.ClipboardData{
+			Event: event.CLIPBOARD_UPDATED,
+			Text:  text,
+		})
+
+		if err != nil {
+			ws.logger.Warn().Err(err).Msg("could not sync clipboard")
+		}
+	})
 }
 
 func (ws *WebSocketManagerCtx) Shutdown() error {
-	ws.shutdown <- true
 	return nil
 }