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qmk_firmware/docs/mod_tap.md

4.1 KiB

Mod-Tap

The Mod-Tap key MT(mod, kc) acts like a modifier when held, and a regular keycode when tapped. In other words, you can have a key that sends Escape when you tap it, but functions as a Control or Shift key when you hold it down.

The modifiers this keycode and OSM() accept are prefixed with MOD_, not KC_:

Modifier Description
MOD_LCTL Left Control
MOD_LSFT Left Shift
MOD_LALT Left Alt
MOD_LGUI Left GUI (Windows/Command/Meta key)
MOD_RCTL Right Control
MOD_RSFT Right Shift
MOD_RALT Right Alt (AltGr)
MOD_RGUI Right GUI (Windows/Command/Meta key)
MOD_HYPR Hyper (Left Control, Shift, Alt and GUI)
MOD_MEH Meh (Left Control, Shift, and Alt)

You can combine these by ORing them together like so:

MT(MOD_LCTL | MOD_LSFT, KC_ESC)

This key would activate Left Control and Left Shift when held, and send Escape when tapped.

For convenience, QMK includes some Mod-Tap shortcuts to make common combinations more compact in your keymap:

Key Aliases Description
LCTL_T(kc) CTL_T(kc) Left Control when held, kc when tapped
LSFT_T(kc) SFT_T(kc) Left Shift when held, kc when tapped
LALT_T(kc) ALT_T(kc) Left Alt when held, kc when tapped
LGUI_T(kc) LCMD_T(kc), LWIN_T(kc), GUI_T(kc), CMD_T(kc), WIN_T(kc) Left GUI when held, kc when tapped
RCTL_T(kc) Right Control when held, kc when tapped
RSFT_T(kc) Right Shift when held, kc when tapped
RALT_T(kc) ALGR_T(kc) Right Alt when held, kc when tapped
RGUI_T(kc) RCMD_T(kc), RWIN_T(kc) Right GUI when held, kc when tapped
SGUI_T(kc) SCMD_T(kc), SWIN_T(kc) Left Shift and GUI when held, kc when tapped
LCA_T(kc) Left Control and Alt when held, kc when tapped
LCAG_T(kc) Left Control, Alt and GUI when held, kc when tapped
RCAG_T(kc) Right Control, Alt and GUI when held, kc when tapped
C_S_T(kc) Left Control and Shift when held, kc when tapped
MEH_T(kc) Left Control, Shift and Alt when held, kc when tapped
HYPR_T(kc) ALL_T(kc) Left Control, Shift, Alt and GUI when held, kc when tapped - more info here

Caveats

Unfortunately, these keycodes cannot be used in Mod-Taps or Layer-Taps, since any modifiers specified in the keycode are ignored.

Additionally, you may run into issues when using Remote Desktop Connection on Windows. Because these codes send shift very fast, Remote Desktop may miss the codes.

To fix this, open Remote Desktop Connection, click on "Show Options", open the the "Local Resources" tab. In the keyboard section, change the drop down to "On this Computer". This will fix the issue, and allow the characters to work correctly.