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Bug in Qt 5.12 drag n'drop ?

Scheduled Pinned Locked Moved Unsolved General and Desktop
qat 5.12 drag ndrop
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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #48

    @ModelTech can you provide a minimal compilable example that shows that change of behaviour ?

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    • R Offline
      R Offline
      ReDEnergy
      wrote on last edited by ReDEnergy
      #49

      Hi. I had the same problem. Everything worked fine on Qt 5.7 then after I updated to Qt 5.12 dropping would not work at all.
      At least in my case it seems that for previous version of Qt only implementing dragEnterEvent was enough but with 5.12 I had to also override the dragMoveEvent event.
      So, basically I have this 2 things and now it works as expected. Hope it helps someone.

      void QtDropArea::dragEnterEvent(QDragEnterEvent *event)
      {
      	event->acceptProposedAction();
      }
      
      // this was added after updating to Qt 5.12
      void QtDropArea::dragMoveEvent(QDragMoveEvent *event)
      {
      	event->acceptProposedAction();
      }
      
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      • Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on last edited by
        #50

        @ReDEnergy said in Bug in Qt 5.12 drag n'drop ?:

        QtDropArea

        From what did you derive QtDropArea?

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        • R Offline
          R Offline
          ReDEnergy
          wrote on last edited by ReDEnergy
          #51

          from the classic QWidget

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          • Christian EhrlicherC Offline
            Christian EhrlicherC Offline
            Christian Ehrlicher
            Lifetime Qt Champion
            wrote on last edited by
            #52

            Thx for your hint with the dragMoveEvent() reimpl. I think I can reproduce your issue and also found the corresponding commit.

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            • Christian EhrlicherC Offline
              Christian EhrlicherC Offline
              Christian Ehrlicher
              Lifetime Qt Champion
              wrote on last edited by aha_1980
              #53

              Can you please check if you get a dragEnterEvent in the problematic case? I would guess no.
              The problem was introduced with f8944a7f07112c85dc4f66848cabb490514cd28e which is a bugfix for QTBUG-67155.

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              aha_1980A 1 Reply Last reply
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              • R Offline
                R Offline
                ReDEnergy
                wrote on last edited by
                #54

                Great to hear that. So, I suppose what I did is a workaround for the moment, but at least it works.

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                • Christian EhrlicherC Christian Ehrlicher

                  Can you please check if you get a dragEnterEvent in the problematic case? I would guess no.
                  The problem was introduced with f8944a7f07112c85dc4f66848cabb490514cd28e which is a bugfix for QTBUG-67155.

                  aha_1980A Offline
                  aha_1980A Offline
                  aha_1980
                  Lifetime Qt Champion
                  wrote on last edited by
                  #55

                  @Christian-Ehrlicher I already did some cross-links, can you create a bugreport for that issue?

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                  • Christian EhrlicherC Offline
                    Christian EhrlicherC Offline
                    Christian Ehrlicher
                    Lifetime Qt Champion
                    wrote on last edited by Christian Ehrlicher
                    #56

                    https://bugreports.qt.io/browse/QTBUG-72844 and https://codereview.qt-project.org/249086

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                    • Christian EhrlicherC Offline
                      Christian EhrlicherC Offline
                      Christian Ehrlicher
                      Lifetime Qt Champion
                      wrote on last edited by
                      #57

                      The bug will be fixed in 5.12.1

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