How to make a "kiosk"-application
The computer could be any computer capable of running FreeBSD or Linux.
Since you have to place the windows yourself on to the screen, is is handy to have a grid to work with. This is dependent on the resolution of your screen.
Since your application is without a window manager you yourself have to resize and position your window. In Gtk you do that with:
// You must hold width and height and position // within the application... static gint window_x_width = 300; static gint window_y_height = 300; static gint window_x_pos = 100; static gint window_y_pos = 200; ... gtk_window_move( GTK_WINDOW( window ), window_x_pos, window_y_pos ); ... gtk_widget_set_size_request (da, window_x_width, window_y_height); ...
You have to install X-window on the system but without having the X-window start on boot.
This is how a startup script in FreeBSD could look like
/etc/rc.local --- #!/usr/local/bin/bash /usr/sbin/ntpdate -s 0.ubuntu.pool.ntp.org DISPLAY=:0.0 export DISPLAY /usr/local/bin/X -ac & # Let the x-server have time to start sleep 20 # Connect from any IP /usr/local/bin/xhost + & # Remove the cursor from the screen, turn off screensaver /usr/local/bin/unclutter -root -idle 1 & /usr/local/bin/xset -dpms & /usr/local/bin/xset s off & # set background # https://en.wikipedia.org/wiki/X11_color_names /usr/local/bin/xsetroot -solid Grey & # show local time TZ=CEST export TZ /usr/local/bin/xclock -geometry 384x307-0+0 & ... # # Infact... The application can be run on some other! computer. # In the good old days we talked about X-terminals... # https://en.wikipedia.org/wiki/X_terminal # # The arguments to the application should take care of the x,y positon and # the size of the window. # DISPLAY=192.168.37.88:0.0 ./draw-text -x 0 -y 0 -X 896 -Y 307 -g logo -L "" -f 100 & # And! some other applications... ---
You will have a kiosk that run applications without a window-manager.
It is also possible to update the kiosk from other system by using, for example, Spread.
Göran is a software developer working att Raditex Control AB