Remap modifiers when released only (keeping its function untouched)

[jose1711]

Currently I find it impossible to map a modifier - e. g. Left Alt to a key if it's the only key pressed while keeping its original function (modifier) when combined with other keys.
Goal:

• Left alt is "space" when pressed and released alone
• Left alt + F2 still brings up execute dialog (in Gnome)

Configuration:

Result:

• Left alt -> space works
• Left + anything else - breaks

[jonasBoss]

It should work with if_single(KEY_SPACE, LEFT_ALT)
https://github.com/sezanzeb/input-remapper/blob/main/readme/macros.md#if_single

[jose1711]

if_single(key(KEY_SPACE), key(KEY_LEFTALT))

Thank you, this works but only to an extent. In Gnome Alt-held, Tab-tapped, Alt-still held no longer brings the menu with active windows. "Alt-tabbing" between most recent windows still works though.

[sezanzeb]

if_single(key(KEY_SPACE), hold(KEY_LEFTALT)) might work then

[jose1711]

if_single(key(KEY_SPACE), hold(KEY_LEFTALT))

Thank you, that worked nicely. What if I want to map Control L + Alt L but only if pressed alone? if_single does not seem to be able to capture such events - it works for a single modifier, but not multiple ones.

[sezanzeb]

The issue is probably that while Control_L is pressed, all of the injected events are consumed by the environment to potentially trigger shortcuts. Like ctrl + a to select all.

Try mapping Control L to Control L, and add key(Control_L)... to your mapping. like:

This is a bit stupid as of now. In the future there will probably a key_up macro that properly releases the Control_L key (depending on which uinput has it pressed at the moment) before going into the macro.

The redundant control_l macro is needed at the moment to ensure the control event is sent to the "keyboard" uinput, so that the key macro can release it.

Also see https://github.com/sezanzeb/input-remapper/blob/main/readme/usage.md#combinations

[jose1711]

Thank you, it's a bit complex but I works.