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  1. Qt
  2. QTBUG-53103

QWidgetWindow: Events are sent to deleted widget on destruction

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Done
    • Affects Version/s: 5.6.0
    • Fix Version/s: 5.6.1
    • Labels:
      None
    • Commits:
      6a84a51611f69f3641ae47bbd7b6bd5266ae88ef ce37467acf34edf1380f896a0942b616dc4cbead

      Description

      The destruction sequence of top-level QWidgets results on QWidgetWindow sending an event to its widget while it's running ~QObject(), and therefore after it has run ~QWidget(). The sequence is (omitting a few calls):

      ~QWidget() -->
      ~QObject() -->
      ~QWidgetPrivate() -->
      QWidgetPrivate::deleteTLSysExtra() -->
      QWindow::destroy() -->
      QWidgetWindow::event()
      

      This results in two issues. First, QWidgetWindow expects its widget to be a QWidget after ~QWidget() has been called. Second, any event filter or QApplication::notify() override has to deal with a QObject being deleted without having a way of checking that (as an example, trying to instantiate a QPointer with that object will cause an immediate assert failure).

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            Assignee:
            dedietri Gabriel de Dietrich (drgvond)
            Reporter:
            dedietri Gabriel de Dietrich (drgvond)
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              Dates

              Created:
              Updated:
              Resolved:

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