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I am trying to develop a "kiosk mode" application based on the Chromium CEF web browser. I want to prevent the user from leaving the browser. This entails disabling keyboard shortcuts such as (but not limited to) the following:

  • Alt-F4
  • Ctrl-Super-D
  • Ctrl-Alt-Del
  • Super-S

I currently have a script that, prior to starting my app, uses xmodmap to load in a special keymap and mouse pointer configuration. It also uses gsettings to set various keys within the following:

  • org.gnome.settings-daemon.plugins.media-keys
  • org.gnome.desktop.wm.keybindings

Under Ubuntu 14.04, this approach seems to work for most keys, but it is very cumbersome. Furthermore, ot all keys seem to be accounted for under Ubuntu 12.04. I may have to set keys here:

  • /apps/metacity/window_keybindings/close
  • /apps/compiz-1/plugins/core/screen0/options/close_window_key

How can I make this completely work under both Ubuntu 12.04 and 14.04? Is this even the right approach? Is there perhaps an easier way than setting each individual key? I thought using xmodmap would work best, but it appears that the OS intercepts some keystrokes prior to them reaching my app.

  • If I want to quit an app, and it "won't allow me" I kill it at once. And then erase it. It's not app author's (nor is it yours @gonzobrains) place to tell me I can't exit the app when I need to (my computer, my circumstances, my usage scenario - can you know them all?). – LIttle Ancient Forest Kami Nov 17 '15 at 8:15
  • umm. i did say "kiosk mode" application, right? ding google it. – gonzobrains Nov 17 '15 at 14:28
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    Darn. You did and I missed it. Comment irrelevant then. – LIttle Ancient Forest Kami Nov 17 '15 at 14:55

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