reverse operation

[wbolster]

is it possible to generate a fake modifier key when a normal key is pressed in combination with another normal key?

on osx, the karabiner tool allows for some magic behaviour of the tab key when it is pressed with the h and l keys: it allows for vim-like window navigation in "alt-tab style" using the tab key as a modifier. when pressed alone, tab just generates a tab.

is this possible to achieve under linux/xorg?

[wbolster]

i almost got it to work:

# Make tab a modifier key, acting like Alt_L. Then assign a unused keycode for
# Tab so that xcape can make it a Tab again if pressed by itself.
xmodmap -e 'keycode 23 = Alt_L' -e 'keycode 255 = Tab'
xcape -e 'Alt_L=Tab'

this makes tab-x act like alt-x, while still allowing tab by itself. alt-tab also works.

however, shift-tab now fails to work, and this is annoying since it's used to cycle backwards in many guis.

the xev tool gives this output when i type shift-tab:

FocusIn event, serial 42, synthetic NO, window 0xe00001,
    mode NotifyWhileGrabbed, detail NotifyNonlinear

KeymapNotify event, serial 42, synthetic NO, window 0x0,
    keys:  125 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   

PropertyNotify event, serial 42, synthetic NO, window 0xe00001,
    atom 0x126 (_NET_WM_STATE), time 20299751, state PropertyNewValue

FocusIn event, serial 42, synthetic NO, window 0xe00001,
    mode NotifyUngrab, detail NotifyNonlinear

KeymapNotify event, serial 42, synthetic NO, window 0x0,
    keys:  3   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   

KeyPress event, serial 42, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20302826, (1116,820), root:(1153,921),
    state 0x0, keycode 50 (keysym 0xffe1, Shift_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 42, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20303034, (1116,820), root:(1153,921),
    state 0x1, keycode 23 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 42, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20303114, (1116,820), root:(1153,921),
    state 0x9, keycode 23 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

MappingNotify event, serial 42, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

KeyPress event, serial 42, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20303115, (1116,820), root:(1153,921),
    state 0x1, keycode 255 (keysym 0xff09, Tab), same_screen YES,
    XLookupString gives 1 bytes: (09) " "
    XmbLookupString gives 1 bytes: (09) "   "
    XFilterEvent returns: False

KeyRelease event, serial 42, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20303116, (1116,820), root:(1153,921),
    state 0x1, keycode 255 (keysym 0xff09, Tab), same_screen YES,
    XLookupString gives 1 bytes: (09) " "
    XFilterEvent returns: False

MappingNotify event, serial 43, synthetic NO, window 0x0,
    request MappingKeyboard, first_keycode 8, count 248

KeyRelease event, serial 43, synthetic NO, window 0xe00001,
    root 0x7d, subw 0x0, time 20303258, (1116,820), root:(1153,921),
    state 0x1, keycode 50 (keysym 0xffe5, Caps_Lock), same_screen YES,
    XKeysymToKeycode returns keycode: 66
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

FocusOut event, serial 44, synthetic NO, window 0xe00001,
    mode NotifyNormal, detail NotifyNonlinear

[alols]

duplicate of #16