Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-35887

mouse cursor regression (crash) on MacOS

    XMLWordPrintable

Details

    • macOS
    • 09f54e99f2e956908f9104181e7d61fa2f6a027d

    Description

      Run the small attached sample. Click on the 1st window to activate it -> crash (see picture of crash point in qnsview.mm)

      The debugger says:
      "[NSCursor set]: message sent to deallocated instance"
      (I have Zombie enabled under XCode 5)

      This is a Cocoa issue of Qt 5.x.
      After some more analysis of the problem, I found the following:

      QCocoaWindow stores a copy of a NSCursor in QCocoaWindow::m_windowCursor (cf. QCocoaWindow::setWindowCursor)
      but this becomes a dangling pointer later when:

      QCocoaCursor::changeCursor is called, which itself calls convertCursor and the line [cocoaCursor release] is reached

      My guess is that this is the root of the problem.

      Attachments

        1. s4.png
          s4.png
          14 kB
        2. test.cpp
          0.5 kB

        Issue Links

          For Gerrit Dashboard: QTBUG-35887
          # Subject Branch Project Status CR V

          Activity

            People

              liaqi Liang Qi
              jirauser26727 user-04d21 (Inactive)
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes