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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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  • S skylendar
    14 Dec 2018, 22:42

    @skylendar

    Ah, "robot" is based on a QGraphicsObject, which receives QGraphicsSceneDragDropEvent , whereas my app is based on a mere QWidget, which receives a QDragEnterEvent

    S Offline
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    skylendar
    wrote on 14 Dec 2018, 22:44 last edited by
    #10

    @skylendar

    And remember, my code works fine with qt5.11.x, and not with qt5.12.0

    1 Reply Last reply
    0
    • C Offline
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      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on 15 Dec 2018, 08:47 last edited by
      #11

      Please provide a example - otherwise I don't see how we can spot 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 15 Dec 2018, 16:06
      1
      • C Christian Ehrlicher
        15 Dec 2018, 08:47

        Please provide a example - otherwise I don't see how we can spot the problem...

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        skylendar
        wrote on 15 Dec 2018, 16:06 last edited by
        #12

        @Christian-Ehrlicher

        Ok, in that case, get my open source app:
        https://sourceforge.net/projects/skylendar/
        and compile it with qt5.12.0
        When compiled and running, drag the "Now" Dataset (on the left column) onto the window named "Standard wheel".

        Then, the pointer becomes a barred red circle, instead of a black hand for dropping, i.e. dropping is impossible.

        When compiled with 5.11 apparently nothing happens because the standard wheel already uses "Now", but it works...

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          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on 15 Dec 2018, 16:28 last edited by
          #13

          I tried to run your app but I won't let something run as root on my system. Please provide a minimal, compilable example to reproduce the issue.

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

          A 1 Reply Last reply 15 Dec 2018, 16:30
          1
          • C Christian Ehrlicher
            15 Dec 2018, 16:28

            I tried to run your app but I won't let something run as root on my system. Please provide a minimal, compilable example to reproduce the issue.

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            aha_1980
            Lifetime Qt Champion
            wrote on 15 Dec 2018, 16:30 last edited by
            #14

            @Christian-Ehrlicher

            I tried to run your app but I won't let something run as root on my system.

            probably the elevated rights are part of the problem?

            Qt has to stay free or it will die.

            C S 3 Replies Last reply 15 Dec 2018, 16:40
            0
            • A aha_1980
              15 Dec 2018, 16:30

              @Christian-Ehrlicher

              I tried to run your app but I won't let something run as root on my system.

              probably the elevated rights are part of the problem?

              C Offline
              C Offline
              Christian Ehrlicher
              Lifetime Qt Champion
              wrote on 15 Dec 2018, 16:40 last edited by
              #15

              @aha_1980 said in Bug in Qt 5.12 drag n'drop ?:

              probably the elevated rights are part of the problem?

              Don't think so - it's using a database and the app which creates the schema etc. wants admin rights. After this it looks like the normal application can run without admin rights but did not came that far.

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

              1 Reply Last reply
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              • A aha_1980
                15 Dec 2018, 16:30

                @Christian-Ehrlicher

                I tried to run your app but I won't let something run as root on my system.

                probably the elevated rights are part of the problem?

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                S Offline
                skylendar
                wrote on 15 Dec 2018, 16:44 last edited by
                #16

                @aha_1980

                No, only skydmin needs admin right in order to install the db. skylendar runs as a normal user.

                1 Reply Last reply
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                • A aha_1980
                  15 Dec 2018, 16:30

                  @Christian-Ehrlicher

                  I tried to run your app but I won't let something run as root on my system.

                  probably the elevated rights are part of the problem?

                  S Offline
                  S Offline
                  skylendar
                  wrote on 15 Dec 2018, 16:46 last edited by
                  #17

                  @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.

                  A 1 Reply Last reply 15 Dec 2018, 16:54
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                  • S skylendar
                    15 Dec 2018, 16:46

                    @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.

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                    aha_1980
                    Lifetime Qt Champion
                    wrote on 15 Dec 2018, 16:54 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 15 Dec 2018, 17:00
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                    • A aha_1980
                      15 Dec 2018, 16:54

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

                      I have too much of my own problems

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                      skylendar
                      wrote on 15 Dec 2018, 17:00 last edited by
                      #19

                      @aha_1980

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

                      1 Reply Last reply
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                      • A aha_1980
                        15 Dec 2018, 16:54

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

                        I have too much of my own problems

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                        skylendar
                        wrote on 15 Dec 2018, 17:05 last edited by
                        #20

                        @aha_1980

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

                        A 1 Reply Last reply 15 Dec 2018, 17:28
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                        • S skylendar
                          15 Dec 2018, 17:05

                          @aha_1980

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

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                          aha_1980
                          Lifetime Qt Champion
                          wrote on 15 Dec 2018, 17:28 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 15 Dec 2018, 17:50
                          1
                          • A aha_1980
                            15 Dec 2018, 17:28

                            @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.

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                            skylendar
                            wrote on 15 Dec 2018, 17:50 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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                            • A aha_1980
                              15 Dec 2018, 17:28

                              @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 15 Dec 2018, 18:02 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 ?

                              M J 2 Replies Last reply 15 Dec 2018, 18:22
                              -2
                              • S skylendar
                                15 Dec 2018, 18:02

                                @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 ?

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                                M Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on 15 Dec 2018, 18:22 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.

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                                • S skylendar
                                  15 Dec 2018, 18:02

                                  @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 ?

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                                  J Offline
                                  J.Hilk
                                  Moderators
                                  wrote on 16 Dec 2018, 08:27 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 16 Dec 2018, 14:04
                                  2
                                  • J J.Hilk
                                    16 Dec 2018, 08:27

                                    @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 16 Dec 2018, 14:04 last edited by
                                    #26

                                    @J.Hilk

                                    Who has a linux dnd program which can be tested ?

                                    M 1 Reply Last reply 16 Dec 2018, 16:01
                                    0
                                    • S skylendar
                                      16 Dec 2018, 14:04

                                      @J.Hilk

                                      Who has a linux dnd program which can be tested ?

                                      M Offline
                                      M Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on 16 Dec 2018, 16:01 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 17 Dec 2018, 15:41
                                      0
                                      • M mrjj
                                        16 Dec 2018, 16:01

                                        @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 17 Dec 2018, 15:41 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.

                                        M 1 Reply Last reply 17 Dec 2018, 15:59
                                        0
                                        • S skylendar
                                          17 Dec 2018, 15:41

                                          @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.

                                          M Offline
                                          M Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on 17 Dec 2018, 15:59 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 17 Dec 2018, 16:44
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