Key Values - Web APIs
keycode_power (26) "poweroff" the poweroff or powerdown key.
... gdk_key_powerdown (0x1008ff21) gdk_key_poweroff (0x1008ff2a) qt::key_powerdown (0x0100010b) qt::key_poweroff (0x010000b7) "printscreen" the printscreen or prtscr key.