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Run Qt widget app on linux with no GUI

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  • P Offline
    P Offline
    p3c0
    Moderators
    wrote on 20 Oct 2016, 07:47 last edited by p3c0
    #16

    @Bremenpl

    but the point is I dont know how to turn the app on in console mode in any OS

    As said earlier boot to default tty where X is running, launch the app in fullscreen mode through startup scripts.
    Or you can try the linuxfb mode so that you own the framebuffer but then you get no window manager functionalities for eg. alt-tab switch or window decorations

    157

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    • B Offline
      B Offline
      Bremenpl
      wrote on 20 Oct 2016, 07:52 last edited by
      #17

      So in short words, there is no way in linux to hide the whole OS GUI but still be able to run selected apps with GUI? One has to use own frame buffer?

      lprzenioslo.zut.edu.pl

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      • P Offline
        P Offline
        p3c0
        Moderators
        wrote on 20 Oct 2016, 08:00 last edited by p3c0
        #18

        @Bremenpl

        So in short words, there is no way in linux to hide the whole OS GUI but still be able to run selected apps with GUI?

        Yes there is. The most easiest is to use the minimal OS so customizations becomes easy. Donot install anything else but a bare minimal window manager so that the user gets a feel that only your application is running on top.

        157

        B 1 Reply Last reply 20 Oct 2016, 08:05
        0
        • P p3c0
          20 Oct 2016, 08:00

          @Bremenpl

          So in short words, there is no way in linux to hide the whole OS GUI but still be able to run selected apps with GUI?

          Yes there is. The most easiest is to use the minimal OS so customizations becomes easy. Donot install anything else but a bare minimal window manager so that the user gets a feel that only your application is running on top.

          B Offline
          B Offline
          Bremenpl
          wrote on 20 Oct 2016, 08:05 last edited by
          #19

          @p3c0 So lets say I install Debian without any GUI and then I just install lightDM or OpenBox?

          lprzenioslo.zut.edu.pl

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          • P Offline
            P Offline
            p3c0
            Moderators
            wrote on 20 Oct 2016, 08:07 last edited by
            #20

            @Bremenpl Right. Or Fluxbox.

            157

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            • B Offline
              B Offline
              Bremenpl
              wrote on 20 Oct 2016, 08:11 last edited by
              #21

              Ill try to do this the way you described. Thank you very much.

              lprzenioslo.zut.edu.pl

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              • P Offline
                P Offline
                p3c0
                Moderators
                wrote on 20 Oct 2016, 08:40 last edited by
                #22

                @Bremenpl Good Luck :)

                157

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                • S Offline
                  S Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on 20 Oct 2016, 21:51 last edited by
                  #23

                  Hi,

                  Depending on your needs, wayland and the QtWayland module might also be an option.

                  Another possible option might be KDE's kiosk mode.

                  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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                  • E Offline
                    E Offline
                    Eeli K
                    wrote on 21 Oct 2016, 10:26 last edited by
                    #24

                    If you mean that you want to boot to command line, then start the graphical Qt app but not be able to use other graphical applications and don't want a desktop environment (which you probably mean by "GUI") with desktop, panel, application launcher, etc., but still accept the X (maybe X.org) server running, then yes, it's possible. See "man startx" (ftp://www.x.org/pub/X11R7.5/doc/man/man1/startx.1.html). As you can see in the given .xinitrc example, you can write there what you want to start when X is fired up. Basically you put only your application name and the wanted command line arguments there. Then, on the command line, give the command 'startx'.

                    You have to accept that when your application opens a dialog or other window it looks ugly, can't be moved or resized etc. You can of course try to implement a minimal in-application window manager or at least take care that window sizes and placements are good enough and maybe draw a nice border around it. OR you can add a minimal window manager to .xinitrc file, as in the example.

                    B 1 Reply Last reply 24 Oct 2016, 06:06
                    1
                    • E Eeli K
                      21 Oct 2016, 10:26

                      If you mean that you want to boot to command line, then start the graphical Qt app but not be able to use other graphical applications and don't want a desktop environment (which you probably mean by "GUI") with desktop, panel, application launcher, etc., but still accept the X (maybe X.org) server running, then yes, it's possible. See "man startx" (ftp://www.x.org/pub/X11R7.5/doc/man/man1/startx.1.html). As you can see in the given .xinitrc example, you can write there what you want to start when X is fired up. Basically you put only your application name and the wanted command line arguments there. Then, on the command line, give the command 'startx'.

                      You have to accept that when your application opens a dialog or other window it looks ugly, can't be moved or resized etc. You can of course try to implement a minimal in-application window manager or at least take care that window sizes and placements are good enough and maybe draw a nice border around it. OR you can add a minimal window manager to .xinitrc file, as in the example.

                      B Offline
                      B Offline
                      Bremenpl
                      wrote on 24 Oct 2016, 06:06 last edited by
                      #25

                      @Eeli-K Thank you, thats most likely what I meant :)

                      lprzenioslo.zut.edu.pl

                      M 1 Reply Last reply 24 Oct 2016, 06:51
                      0
                      • B Bremenpl
                        24 Oct 2016, 06:06

                        @Eeli-K Thank you, thats most likely what I meant :)

                        M Offline
                        M Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on 24 Oct 2016, 06:51 last edited by
                        #26

                        @Bremenpl
                        Hi, other option is to create a custom session
                        so you can have single app and also be able to start a desktop if needed.

                        Most likely you will want to run a windows manager also.

                        http://askubuntu.com/questions/23932/how-do-i-replace-the-desktop-by-an-application

                        Im not sure if @Eeli-K solution is the same in debian version. :)

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                        24 Oct 2016, 06:06

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