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Using QtVirtualKeyboard

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  • D Offline
    D Offline
    davidino
    wrote on last edited by
    #3

    Hello S.Gaist, thank you very much for your answers.

    the yocto version that generated the compiler is poky-morty, which has been released in 10/28/2016. Compiler version (GCC) 6.2.0.
    I've got some questions, maybe some of them could be silly :)

    About qt versions I'm a little confused about the following matter: yocto generated qmake is Qt5.7.1 version, while the packages of qtcreator 4.4.1, that I'm using, are built with Qt5.9.2. Isn't it an incongruence?

    Besides, if I have version 5.7.1 shouldn't I have the possibility to activate C++11 as required, since the latest one without it was 5.6?

    Regarding the possibility to change version, since I'm a newbie with yocto, it could be difficult for me to change yocto release or qt-recipe. if I download an older version of the qtvirtualkeyboard demo code, could it work?

    Thank you again.

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #4

      Then indeed, it's recent enough.

      No it's not, the version of Qt used to build Qt Creator has no influence on the version(s) you use for your projects.

      Yes, it should be able to build QtVirtualKeyboard since you already have a version of Qt that has C++11 as mandatory which makes the whole case even stranger.

      What steps did you take to configure and build the module ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • D Offline
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        davidino
        wrote on last edited by davidino
        #5

        Hello StGaist,
        One note: at the current state, the platform plugins that I can use are EGLFS or LinuxFB. Are X11 or Wayland required for qtVirtualKeyboard module?
        Currently I'm googling how to include C++11 in my image recipe.

        I didn't take any steps different from the ones that I usually do.
        I just download the code from https://github.com/qt/qtvirtualkeyboard.git, and choose the basic project. Then I select the kit, compile the code and run it.
        In theory I have qtvirtualkeyboard plugin available in my sysroots, but since I didn't know how to include it in a project from scratch, I've prefered to download a demo.

        Qt packages that I've got in my image are the following:
        QT5_PKGS = "
        qt3d
        qt3d-dev
        qt3d-mkspecs
        qtcharts
        qtcharts-dev
        qtcharts-mkspecs
        qtconnectivity-dev
        qtconnectivity-mkspecs
        qtdeclarative
        qtdeclarative-dev
        qtdeclarative-mkspecs
        qtdeclarative-plugins
        qtdeclarative-qmlplugins
        qtgraphicaleffects
        qtgraphicaleffects-dev
        qtlocation-dev
        qtlocation-mkspecs
        qtlocation-plugins
        qtmultimedia
        qtmultimedia-dev
        qtmultimedia-mkspecs
        qtquickcontrols2
        qtquickcontrols2-dev
        qtquickcontrols2-mkspecs
        qtsensors-dev
        qtsensors-mkspecs
        qtsensors-plugins
        qtserialbus
        qtserialbus-dev
        qtserialbus-mkspecs
        qtsvg
        qtsvg-dev
        qtsvg-mkspecs
        qtwebsockets-dev
        qtwebsockets-mkspecs
        qtwebsockets-qmlplugins
        qtvirtualkeyboard
        qtvirtualkeyboard-dev
        qtxmlpatterns
        qtxmlpatterns-dev
        qtxmlpatterns-mkspecs
        "
        Thank you again.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #6

          AFAIK, no it's doesn't have such needs. IIRC, it's QtQuick based.

          What demo ? There's already an example with the module.

          Note that the official repos are at https://code.qt.io Github is just a mirror.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • D Offline
            D Offline
            davidino
            wrote on last edited by davidino
            #7

            Hello St Gaist, thank you for your response.

            • Regarding the examples that should come with the module, probably, because the sdk is compiled through yocto recipes, I haven't got any qt examples installed, That's why I have to download them. Indeed I still need to learn a lot!
              What I have inside sdk concerning VirtualKeyboard are qmldir, plugins.qmltypes and the folder Styles (contained in the path: /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/lib/qt5/qml/QtQuick/VirtualKeyboard).

            • Regarding the project, incuding CONFIG += c++11 and calling make via console, the c++1 error has disappeared.
              compiling main.cpp
              In file included from /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/include/qt5/QtQuick/qquickwindow.h:45:0,
              from /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/include/qt5/QtQuick/qquickview.h:43,
              from /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/include/qt5/QtQuick/QQuickView:1,
              from main.cpp:30:
              /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/include/qt5/QtGui/qopengl.h:106:26: fatal error: GLES2/gl2.h: File o directory non esistente
              compilation terminated.
              Makefile:627: set di istruzioni per l'obiettivo ".obj/main.o" non riuscito
              make: *** [.obj/main.o] Errore 1
              However I've got that file but it's store in the following path /opt/poky/sdk-2.2.2/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/usr/include/GLES2. Don't know why it's looking at a diffrent path.

            • If I try to make and deploy the program with QtCreator, the program starts but, when I try to click on a text field, the program crashes and I get "EGLFS: OpenGL windows cannot be mixed with others".
              Maybe it did the same from the beginning.

            What do you think?
            Thank you.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

              So which project are you building ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • D Offline
                D Offline
                davidino
                wrote on last edited by
                #9

                Well, actually the project that I started with, qtVirtualKeyboard version 5.1.0, is the same found in https://code.qt.io.
                The fact is that I get different results building and running the same program inside qtCreator, or accomplishing these steps via console.
                In qtCreator, the program starts correctly, but it crashes when I press a text line ("EGLFS: OpenGL windows cannot be mixed with others".)
                With the console, I cannot carry out the make process (error: GLES2/gl2.h: file or directory not found).
                I'm confused about this difference...

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  Qt Creator sets everything up for the Qt version you are using to build your project.

                  On the command line, it's up to you to ensure that you are using the correct stuff e.g. the correct qmake,

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • D Offline
                    D Offline
                    davidino
                    wrote on last edited by
                    #11

                    Hello StGaist, thank you a lot for your answer.
                    I found out what was wrong with different qmake output issue. Basically calling qmake from console, I forgot to add -spec linux-oe-g++, as I do in QtCreator. Now both the makefiles generated are the same.
                    The problem "EGLFS: OpenGL windows cannot be mixed with others" that makes crash the application, when I try to write in an edit field, remains.
                    On internet I still didn't find a suitable solution, but I have been still looking for it...

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #12

                      Which demo is it ?

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • D Offline
                        D Offline
                        davidino
                        wrote on last edited by
                        #13

                        Hello StGaist,
                        thank you for your answer. The demo is git://code.qt.io/qt/qtvirtualkeyboard.git.

                        The problem is similar to the one described int the following thread regarding combo boxes: https://bugreports.qt.io/browse/QTBUG-38405.
                        From a comment of this "bug".
                        "Qt Quick Controls 2 is designed for Embedded platforms, unlike Qt Quick Controls 1 which was designed for desktop and mobile first. In Qt Quick Controls 2 Combo boxes work because they don't try to create new native window surfaces on platforms that don't support doing so."

                        I think that the problem is that qtvirtualkeyboard demo is designed with QtQuick1, so it cannot work with eglfs as it tries to create a new window. In other words, the demo should be written using Qt Quick Controls 2 for working correctly.
                        What do you think about that?
                        Thank you for your support.

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #14

                          It's not a demo, it's a module

                          Which version are you using exactly ?

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • D Offline
                            D Offline
                            davidino
                            wrote on last edited by
                            #15

                            Hello StGaist,
                            If I understand the question correctly, I'm using the demo "basic.pro" contained inside git://code.qt.io/qt/qtvirtualkeyboard.git. The version is 5.10
                            Thank you.

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #16

                              That demo seems to use QtQuick 2 which IIRC should not suffer the troubles you have.

                              Interested in AI ? www.idiap.ch
                              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                              • D Offline
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                                davidino
                                wrote on last edited by
                                #17

                                Hello StGaist, thank you for your message.
                                I tried to download again the module, compile the demo and I get the same problem.
                                I cannot find anything useful on internet, but I'll keep looking at.
                                Maybe in the future I'll use x11 or wayland, and the problem shouldn't show up.

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                                • D Offline
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                                  davidino
                                  wrote on last edited by davidino
                                  #18

                                  Hello to all,
                                  as far as I can understand, for those people which are using Yocto and want to use QtVirtualKeyboard, they have to install Boot2Qt, which contains recipes for installing the required software and making custom images.
                                  See below:
                                  http://doc.qt.io/QtForDeviceCreation/qtee-about-b2qt.html

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