QClipboard::dataChanged() was not emitted in QtWebEngine context - qt

Question

QClipboard::dataChanged() was not emitted in QtWebEngine context with pyqt6 or pyside6, but it works fine with qt5/pyqt5, how to solve it ?
Environment:
Python: 3.9.10 (tags/v3.9.10:f2f3f53, Jan 17 2022, 15:14:21) [MSC v.1929 64 bit (AMD64)]
Flavor: Unknown
Executable: C:\Users\Oscar\AppData\Local\Programs\Python\Python39\python.exe
OS: Windows
Arch: x86_64
WindowsRelease: 10
>>> from PyQt6.QtCore import *
>>> QT_VERSION_STR
'6.2.3'
>>> PYQT_VERSION_STR
'6.2.3'
>>>
from PyQt6.QtCore import *
from PyQt6.QtCore import pyqtSlot as Slot
from PyQt6.QtCore import pyqtSignal as Signal
from PyQt6.QtGui import *
from PyQt6.QtWidgets import *
from PyQt6.QtWebEngineWidgets import *
from PyQt6.QtWebEngineCore import *
import sys
class WebEngineView(QWebEngineView): #
def __init__(self, parent=None):
super().__init__(parent)
self.page().settings().setAttribute(QWebEngineSettings.WebAttribute.JavascriptCanAccessClipboard, True)
self.load(QUrl('https://doc.qt.io/qt-6/qwebenginesettings.html'))
self.clipboard = QGuiApplication.clipboard()
self.clipboard.dataChanged.connect(self.clipboardTextChanged)
#Slot()
def clipboardTextChanged(self):
self.copiedText = self.clipboard.text()
print(self.sender(), self.copiedText)
if __name__ == "__main__":
app = QApplication(sys.argv)
webEngineView = WebEngineView()
webEngineView.show()
sys.exit(app.exec())

Answer 1

I find the solution here
The sandbox somehow blocks the WM_CLIPBOARDUPDATE message (
https://learn.microsoft.com/en-us/windows/win32/dataxchg/wm-clipboardupdate
) and QPA can't notify about clipboard changes.
The sandbox on windows is enabled since
https://codereview.qt-project.org/c/qt/qtwebengine/+/276060
neosettler, as a workaround you can disable the sandbox by the
--no-sandbox command line argument or by setting the QTWEBENGINE_DISABLE_SANDBOX environment variable.
Then I changed my code to:
from PyQt6.QtCore import *
from PyQt6.QtCore import pyqtSlot as Slot
from PyQt6.QtCore import pyqtSignal as Signal
from PyQt6.QtGui import *
from PyQt6.QtWidgets import *
from PyQt6.QtWebEngineWidgets import *
from PyQt6.QtWebEngineCore import *
import sys
import os
class WebEngineView(QWebEngineView): #
def __init__(self, parent=None):
super().__init__(parent)
self.page().settings().setAttribute(QWebEngineSettings.WebAttribute.JavascriptCanAccessClipboard, True)
self.load(QUrl('https://doc.qt.io/qt-6/qwebenginesettings.html'))
self.clipboard = QGuiApplication.clipboard()
self.clipboard.dataChanged.connect(self.clipboardTextChanged)
#Slot()
def clipboardTextChanged(self):
self.copiedText = self.clipboard.text()
print(self.copiedText)
if __name__ == "__main__":
sys.argv.append('--no-sandbox')
print(sys.argv)
app = QApplication(sys.argv)
webEngineView = WebEngineView()
webEngineView.show()
sys.exit(app.exec())