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  4. Bug in Qt 5.12 drag n'drop ?
Forum Update on Monday, May 27th 2025

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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  • S skylendar

    @aha_1980

    If you really are scared to run skydmin as root, I can tell you how to install the db as the postgres non-root user.

    aha_1980A Offline
    aha_1980A Offline
    aha_1980
    Lifetime Qt Champion
    wrote on last edited by
    #18

    @skylendar Thanks, but I don't think I'll debug your program ;)

    I have too much of my own problems

    Qt has to stay free or it will die.

    S 2 Replies Last reply
    0
    • aha_1980A aha_1980

      @skylendar Thanks, but I don't think I'll debug your program ;)

      I have too much of my own problems

      S Offline
      S Offline
      skylendar
      wrote on last edited by
      #19

      @aha_1980

      I don't ask you to debug my app, just run it.

      1 Reply Last reply
      0
      • aha_1980A aha_1980

        @skylendar Thanks, but I don't think I'll debug your program ;)

        I have too much of my own problems

        S Offline
        S Offline
        skylendar
        wrote on last edited by
        #20

        @aha_1980

        In addition, I don't want anything. I just signal a possible bug. That's all.

        aha_1980A 1 Reply Last reply
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        • S skylendar

          @aha_1980

          In addition, I don't want anything. I just signal a possible bug. That's all.

          aha_1980A Offline
          aha_1980A Offline
          aha_1980
          Lifetime Qt Champion
          wrote on last edited by aha_1980
          #21

          @skylendar thats why we need a simple program, trimmed down to the actual problem.

          Otherwise its hard to track down where the bug is. Until now it is not even proven that Qt is guilty.

          Qt has to stay free or it will die.

          S 2 Replies Last reply
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          • aha_1980A aha_1980

            @skylendar thats why we need a simple program, trimmed down to the actual problem.

            Otherwise its hard to track down where the bug is. Until now it is not even proven that Qt is guilty.

            S Offline
            S Offline
            skylendar
            wrote on last edited by
            #22

            @aha_1980

            This is not a matter of guilt or not. We are not in an american thriller.
            And besides, how do you explain that my app works fine with qt5.11 and below, but not with qt5.12 ?

            1 Reply Last reply
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            • aha_1980A aha_1980

              @skylendar thats why we need a simple program, trimmed down to the actual problem.

              Otherwise its hard to track down where the bug is. Until now it is not even proven that Qt is guilty.

              S Offline
              S Offline
              skylendar
              wrote on last edited by
              #23

              @aha_1980

              And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

              mrjjM J.HilkJ 2 Replies Last reply
              -2
              • S skylendar

                @aha_1980

                And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #24

                @skylendar

                • Qt is actually a commercial program, and most of you, if not all, are paid for debugging it

                Actually this is a user forums and no one here is paid anything to help :)
                We are not employees, but ordinary users of Qt.

                Anyway, i tried some of old drag drop sample with Qt 5.12 and
                they seems to work. At least on windows.

                1 Reply Last reply
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                • S skylendar

                  @aha_1980

                  And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

                  J.HilkJ Offline
                  J.HilkJ Offline
                  J.Hilk
                  Moderators
                  wrote on last edited by
                  #25

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

                  @aha_1980

                  And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

                  If you happen to own a commercial license you should contact the customer support they may be able to help you more directly.

                  However they also will ask for a minimal compileable project, if your current project is considerably too large.
                  Alternatively there is also the option of paid consulting either from the QtCompany directly or other companies, like for example KDAB


                  Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                  Q: What's that?
                  A: It's blue light.
                  Q: What does it do?
                  A: It turns blue.

                  S 1 Reply Last reply
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                  • J.HilkJ J.Hilk

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

                    @aha_1980

                    And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

                    If you happen to own a commercial license you should contact the customer support they may be able to help you more directly.

                    However they also will ask for a minimal compileable project, if your current project is considerably too large.
                    Alternatively there is also the option of paid consulting either from the QtCompany directly or other companies, like for example KDAB

                    S Offline
                    S Offline
                    skylendar
                    wrote on last edited by
                    #26

                    @J.Hilk

                    Who has a linux dnd program which can be tested ?

                    mrjjM 1 Reply Last reply
                    0
                    • S skylendar

                      @J.Hilk

                      Who has a linux dnd program which can be tested ?

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #27

                      @skylendar
                      Hi
                      What about test with the sample that comes with Qt ?
                      http://doc.qt.io/qt-5/dnd.html#examples
                      There are often directly available in Creator.

                      S 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @skylendar
                        Hi
                        What about test with the sample that comes with Qt ?
                        http://doc.qt.io/qt-5/dnd.html#examples
                        There are often directly available in Creator.

                        S Offline
                        S Offline
                        skylendar
                        wrote on last edited by
                        #28

                        @mrjj

                        Found the puzzle in the examples. It works, but in my case the draggable widget is placed in a QTreeWidget, not just an ordinary QWidget.

                        mrjjM 1 Reply Last reply
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                        • S skylendar

                          @mrjj

                          Found the puzzle in the examples. It works, but in my case the draggable widget is placed in a QTreeWidget, not just an ordinary QWidget.

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #29

                          Hi
                          well it its almost the same unless you used
                          QStandardItemModel::dropMimeData()
                          or something like that.

                          S 1 Reply Last reply
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                          • mrjjM mrjj

                            Hi
                            well it its almost the same unless you used
                            QStandardItemModel::dropMimeData()
                            or something like that.

                            S Offline
                            S Offline
                            skylendar
                            wrote on last edited by skylendar
                            #30

                            @mrjj

                            I can drag from my QTreeWidget, but I can't drop anymore my icon onto my QWidget target, whereas it worked in the previous version of qt (5.11).

                            Everything seems ok, but the dropEvent() method of my QWidget isn't activated (setAcceptDrop() is set to true, of course)

                            mrjjM 1 Reply Last reply
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                            • S skylendar

                              @mrjj

                              I can drag from my QTreeWidget, but I can't drop anymore my icon onto my QWidget target, whereas it worked in the previous version of qt (5.11).

                              Everything seems ok, but the dropEvent() method of my QWidget isn't activated (setAcceptDrop() is set to true, of course)

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #31

                              @skylendar
                              Check the
                              http://doc.qt.io/qt-5/qtwidgets-draganddrop-puzzle-example.html
                              as it drops from ListWidget to Widget.

                              S 1 Reply Last reply
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                              • mrjjM mrjj

                                @skylendar
                                Check the
                                http://doc.qt.io/qt-5/qtwidgets-draganddrop-puzzle-example.html
                                as it drops from ListWidget to Widget.

                                S Offline
                                S Offline
                                skylendar
                                wrote on last edited by
                                #32

                                @mrjj

                                But I already did that... The codes are very similar, but in my case it doesn't work anymore

                                mrjjM 1 Reply Last reply
                                0
                                • Christian EhrlicherC Offline
                                  Christian EhrlicherC Offline
                                  Christian Ehrlicher
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #33

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

                                  The codes are very similar

                                  So you should modify one of them until you hit or fix the problem...

                                  Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                                  Visit the Qt Academy at https://academy.qt.io/catalog

                                  S 1 Reply Last reply
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                                  • S skylendar

                                    @mrjj

                                    But I already did that... The codes are very similar, but in my case it doesn't work anymore

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #34

                                    @skylendar
                                    Ok but it does not seems Qt related then as those sample didn't change between
                                    5.11 and 5.12 so if they still work it seems unlikely something broke on Qt level.

                                    S 1 Reply Last reply
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                                    • mrjjM mrjj

                                      @skylendar
                                      Ok but it does not seems Qt related then as those sample didn't change between
                                      5.11 and 5.12 so if they still work it seems unlikely something broke on Qt level.

                                      S Offline
                                      S Offline
                                      skylendar
                                      wrote on last edited by
                                      #35

                                      @mrjj

                                      On the contrary ! My code didn't change between 5.11 and 5.12, and suddenly it doesn't work...

                                      jsulmJ 1 Reply Last reply
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                                      • Christian EhrlicherC Christian Ehrlicher

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

                                        The codes are very similar

                                        So you should modify one of them until you hit or fix the problem...

                                        S Offline
                                        S Offline
                                        skylendar
                                        wrote on last edited by
                                        #36

                                        @Christian-Ehrlicher
                                        it's exactly what I'm doing :-£

                                        1 Reply Last reply
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                                        • S skylendar

                                          @mrjj

                                          On the contrary ! My code didn't change between 5.11 and 5.12, and suddenly it doesn't work...

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #37

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

                                          My code didn't change between 5.11 and 5.12, and suddenly it doesn't work

                                          This does not prove that there is a bug in Qt (though there could be).
                                          It could be a problem in your code which didn't cause issues with Qt 5.11 but does with Qt 5.12.
                                          So, before saying there is a bug in Qt you should really prove that.

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          A 1 Reply Last reply
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