Swap Hands

Last updated 11 months ago

The swap-hands action allows support for one-handed typing without requiring a separate layer. Set SWAP_HANDS_ENABLE in the Makefile and define a hand_swap_config entry in your keymap. Now whenever the ACTION_SWAP_HANDS command key is pressed the keyboard is mirrored. For instance, to type "Hello, World" on QWERTY you would type ^Ge^s^s^w^c W^wr^sd

Configuration

The configuration table is a simple 2-dimensional array to map from column/row to new column/row. Example hand_swap_config for Planck:

const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
{{11, 0}, {10, 0}, {9, 0}, {8, 0}, {7, 0}, {6, 0}, {5, 0}, {4, 0}, {3, 0}, {2, 0}, {1, 0}, {0, 0}},
{{11, 1}, {10, 1}, {9, 1}, {8, 1}, {7, 1}, {6, 1}, {5, 1}, {4, 1}, {3, 1}, {2, 1}, {1, 1}, {0, 1}},
{{11, 2}, {10, 2}, {9, 2}, {8, 2}, {7, 2}, {6, 2}, {5, 2}, {4, 2}, {3, 2}, {2, 2}, {1, 2}, {0, 2}},
{{11, 3}, {10, 3}, {9, 3}, {8, 3}, {7, 3}, {6, 3}, {5, 3}, {4, 3}, {3, 3}, {2, 3}, {1, 3}, {0, 3}},
};

Note that the array indices are reversed same as the matrix and the values are of type keypos_t which is {col, row} and all values are zero-based. In the example above, hand_swap_config[2][4] (third row, fifth column) would return {7, 2} (third row, eighth column). Yes, this is confusing.

Swap Keycodes

Key

Description

SH_T(key)

Sends key with a tap; momentary swap when held.

SH_ON

Turns on swapping and leaves it on.

SH_OFF

Turn off swapping and leaves it off. Good for returning to a known state.

SH_MON

Swaps hands when pressed, returns to normal when released (momentary).

SH_MOFF

Momentarily turns off swap.

SH_TG

Toggles swap on and off with every key press.

SH_TT

Toggles with a tap; momentary when held.