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Run Qt widget app on linux with no GUI

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  • B Offline
    B Offline
    Bremenpl
    wrote on last edited by Bremenpl
    #13

    Yes thats exacly what I need, and by disabling fancy stuff I wanted to disable whole OS gui. tty7 is default for now. So the scenario is like this:

    1. PC starts with only console mode
    2. Script turns on the QT GUI application in full screen mode.

    Would this be possible: http://doc.qt.io/qt-5/embedded-linux.html#linuxfb ?

    lprzenioslo.zut.edu.pl

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    • p3c0P Offline
      p3c0P Offline
      p3c0
      Moderators
      wrote on last edited by p3c0
      #14

      @Bremenpl Usually for these kind of applications (can say kiosk mode) people start with a minimal OS and a minimal light weight window manager so that OS customizations become easier.

      157

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      • B Offline
        B Offline
        Bremenpl
        wrote on last edited by
        #15

        Thats exaclt what i mean- Kiosk mode. But my os is quite lightweight. I can make it lighter even, but the point is I dont know how to turn the app on in console mode in any OS for now :P.

        lprzenioslo.zut.edu.pl

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        • p3c0P Offline
          p3c0P Offline
          p3c0
          Moderators
          wrote on 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 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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            • p3c0P Offline
              p3c0P Offline
              p3c0
              Moderators
              wrote on 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
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              • p3c0P p3c0

                @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 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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                • p3c0P Offline
                  p3c0P Offline
                  p3c0
                  Moderators
                  wrote on last edited by
                  #20

                  @Bremenpl Right. Or Fluxbox.

                  157

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                  • B Offline
                    B Offline
                    Bremenpl
                    wrote on 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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                    • p3c0P Offline
                      p3c0P Offline
                      p3c0
                      Moderators
                      wrote on last edited by
                      #22

                      @Bremenpl Good Luck :)

                      157

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on 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 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
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                          • E Eeli K

                            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 last edited by
                            #25

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

                            lprzenioslo.zut.edu.pl

                            mrjjM 1 Reply Last reply
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                            • B Bremenpl

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

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on 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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