QWebEngineView: Timers do not function when visible

Question

I was attempting to implement the code from this question, but I have discovered that QTimer does not fire under certain circumstances.

The simplified code:

app = QApplication([])

view = QWebEngineView()
view.show()

def callback():
    sys.exit(0)

QTimer.singleShot(1000, callback)

app.exec()

The application runs forever with this code (ie. callback is never executed). However, if you comment out view.show() then it exits after one second as it should.

As far as I can tell, this problem is particular to QWebEngineView; if we replace the QWebEngineView with a generic QWidget or QLabel, then it works as expected and exits after one second.

What is the cause of this, and how can I fix it?

How strange I have tested the code in Python 3.8.1, PyQt5 5.14.1 on Linux and it works correctly. — eyllanesc
– eyllanesc, Commented Mar 11, 2020 at 1:54
Where do you run your code: CMD or the interactive python console or some IDE? — eyllanesc
– eyllanesc, Commented Mar 11, 2020 at 1:57
mmm, I think it's a bug, try earlier versions of pyqt5 and pyqtwebengine. Are you using the same version of pyqt5 and pyqtwebengine? — eyllanesc
– eyllanesc, Commented Mar 11, 2020 at 2:00

Dragon · Accepted Answer · 2020-03-11 02:28:33Z

0

As prompted by @eyllanesc, I have discovered that this is a bug introduced by the 5.14.0 release of the PyQtWebEngine module; the previous version (5.13.2) does not show this behavior.

answered Mar 11, 2020 at 2:28

Dragon

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