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  1. Qt for Python
  2. PYSIDE-2228

QAxWidget content disappears when not in focus

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Details

    • Bug
    • Resolution: Out of scope
    • Not Evaluated
    • None
    • 6.4.2
    • Other
    • None
    • Windows 11, PowerPoint, Python 3.9, PyQt6
    • Windows

    Description

      I've been working on displaying and editing a PowerPoint-file through a QAxWidget and Active X controls. The display of the pptx-file works as intended, but when clicking on another GUI element like a pushbutton or a lineedit, the pptx-file disappears until you click back into the QAxWidget. I would assume the same behaviour applies to other Microsoft-applications like Word or Excel, but I haven't tested those specifically.

      GIF showcasing the issue:

      Minimal reproducible example:

      import sys
      
      from PyQt6.QAxContainer import QAxWidget
      from PyQt6.QtCore import QEvent
      from PyQt6.QtWidgets import QWidget, QVBoxLayout, QPushButton, QApplication, QMainWindow
      
      
      class MainWindow(QMainWindow):
      
          def __init__(self):
              super(MainWindow, self).__init__()
      
              self.menuBar().addMenu("&About")
      
              self.centralwidget = QWidget(self)
              self.centralwidget_vlayout = QVBoxLayout(self.centralwidget)
      
              self.axwidget = QAxWidget("PowerPoint.Application")
              self.axwidget.installEventFilter(self)
              print(self.axwidget.setControl(
                  r"C:\path\to\presentation.pptx"))
      
              self.pushbutton = QPushButton(self.centralwidget)
              self.pushbutton.setText("Press me!")
      
              self.centralwidget_vlayout.addWidget(self.axwidget)
              self.centralwidget_vlayout.addWidget(self.pushbutton)
      
              self.setCentralWidget(self.centralwidget)
      
              self.show()
      
              self.axwidget.setFocus()
      
          def eventFilter(self, widget: QWidget, event: QEvent):
              if event.type() == QEvent.Type.Resize and widget is self.axwidget:
                  self.axwidget.setFixedHeight(int(self.axwidget.width() / 16 * 9))
      
              return super(MainWindow, self).eventFilter(widget, event)
      
      
      def except_hook(cls, exception, traceback):
          sys.__excepthook__(cls, exception, traceback)
      
      
      if __name__ == '__main__':
          sys.excepthook = except_hook
          app = QApplication(sys.argv)
          mainWin = MainWindow()
          sys.exit(app.exec())

      There is some more weird behaviour I wanna point out in this minimal reproducible example:
      If you remove the line "self.menuBar().addMenu("&About")", which has nothing to the with the QAxWidget, the presentation just won't be displayed? Why? I have another instance where the QAxWidget doesn't display the pptx-presentation, when I remove the applied QFont to the QAxWidgets parent-QGroupBox. I just do not understand this behaviour.

      When on the other hand I want to display a PDF instead and declare the QAxWidget-initialization as follows, the PDF remains always visible, even when clicking on the QPushButton:

      self.axwidget = QAxWidget("Microsoft Web Browser")   
      self.axwidget.installEventFilter(self)
      self.axwidget.dynamicCall("Navigate(const QString&)", r"C:\path\to\doc.pdf") 

      I first noticed this issue using PyQt5, but the behaviour is exactly the same when using PyQt6.

      NOTE: As this is my first bug report on anything ever, I am unsure whether I picked the correct "Component/s".

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          bug_image.gif
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        2. axtest.py
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            crmaurei Cristian Maureira-Fredes
            humanbydefinition Christopher Dietrich
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            Dates

              Created:
              Updated:
              Resolved:

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