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qmk_firmware/docs/feature_swap_hands.md

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Swap-Hands Action

The swap-hands action allows support for one-handed typing without requiring a separate layer. Set ONEHAND_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.

Advanced Swap Commands

Macro Description
ACTION_SWAP_HANDS() Swaps hands when pressed, returns to normal when released (momentary).
ACTION_SWAP_HANDS_TOGGLE() Toggles swap on and off with every key press.
ACTION_SWAP_HANDS_TAP_TOGGLE() Toggles with a tap; momentary when held.
ACTION_SWAP_HANDS_TAP_KEY(key) Sends key with a tap; momentary swap when held.
ACTION_SWAP_HANDS_ON_OFF() Alias for ACTION_SWAP_HANDS()
ACTION_SWAP_HANDS_OFF_ON() Momentarily turns off swap.
ACTION_SWAP_HANDS_ON() Turns on swapping and leaves it on.
ACTION_SWAP_HANDS_OFF() Turn off swapping and leaves it off. Good for returning to a known state.