QWebEngineView content is not updated when it is displayed inside another widget

[nekooee]

I used pyside2 and made a widget, inside which I added QWebEngineView. I wanted to call this widget wherever I wanted and pass the URL to it. When QWebEngineView is in an independent window or QStackedWidget, everything is fine. Still, when it is loaded in another widget, there is a problem, for example, when I type something, it shows the changes after I resize the window. It also has the same problem with scrolling and everything, and it doesn't show the changes until I resize the window.
I even used QDockWidget, it works fine when there is a popup, but as soon as I drag it to the window behind it and it sticks, the same problem occurs again.

this is my code:

from PySide2.QtCore import Qt, QUrl
from PySide2.QtGui import QDesktopServices
from PySide2.QtWidgets import QGraphicsView, QGraphicsScene, QGraphicsProxyWidget, QSizePolicy, QGraphicsOpacityEffect
from PySide2.QtWebEngineWidgets import QWebEngineView, QWebEngineSettings, QWebEnginePage


class CustomWebEnginePage(QWebEnginePage):
    external_windows = []

    def acceptNavigationRequest(self, url, _type, isMainFrame):
        if _type == QWebEnginePage.NavigationTypeLinkClicked:
            QDesktopServices.openUrl(url)
            return False
        return super().acceptNavigationRequest(url, _type, isMainFrame)


class WebViewWidget(QGraphicsView):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.scene = QGraphicsScene(self)

        self.setStyleSheet("*{border: 0px;background:#44475a;}")
        self.webview = QWebEngineView()
        self.webview.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        self.webview.setPage(CustomWebEnginePage(self))
        self.webview.parent()
        self.webview.loadFinished.connect(self.on_load_finished)

        self.opacity_effect = QGraphicsOpacityEffect()
        self.webview.setGraphicsEffect(self.opacity_effect)
        self.opacity_effect.setOpacity(0.0)

        self.webview.settings().setAttribute(QWebEngineSettings.ShowScrollBars, False)

        self.proxy = QGraphicsProxyWidget()
        self.proxy.setWidget(self.webview)

        self.scene.addItem(self.proxy)
        self.setScene(self.scene)

        self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

        self.webview.setContextMenuPolicy(Qt.NoContextMenu)

    def set_url(self, url):
        self.webview.setUrl(QUrl(url))

    def resizeEvent(self, event):
        self.changeSize()

    def on_load_finished(self, success):
        if success:
            self.verticalScrollBar().setSliderPosition(0)
            self.webview.setVisible(True)
            self.changeSize()
            self.opacity_effect.setOpacity(1.0)

    def changeSize(self):
        self.webview.setFixedSize(self.size())
        self.showMaximized()

I should also mention that I used the following template in my code, which may interfere with QWebEnginePage:

https://github.com/Wanderson-Magalhaes/Simple_PySide_Base

[JonB]

@nekooee said in QWebEngineView content is not updated when it is displayed inside another widget:

I should also mention that I used the following template in my code, which may interfere with QWebEnginePage:

So how does it behave when you tried it without this additional stuff?

[nekooee]

@JonB When it opens in a new window that has a title bar (not used template), there is no problem. The template that I used has removed the title bar. I think there is a problem with the code of this template, but the author of the template says that the problem is not related to his project!
See the discussion below:
https://github.com/Wanderson-Magalhaes/Simple_PySide_Base/issues/12