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Run Qt widget app on linux with no GUI

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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
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                    • 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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