qmk_firmware/docs/feature_swap_hands.md
Albert Y d8324e8a9c
Document swap-hands tap-toggle feature (#15229)
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: filterpaper <filterpaper@localhost>
2021-11-29 00:23:37 -08:00

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# Swap-Hands Action
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:
```c
const keypos_t PROGMEM 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` |Momentary swap when held, toggles with repeated taps (see below). |
|`SH_OS` |One shot swap hands: toggles while pressed or until next key press. |
`SH_TT` swap-hands tap-toggle key is similar to [layer tap-toggle](feature_layers.md?id=switching-and-toggling-layers). Tapping repeatedly (5 taps by default) will toggle swap-hands on or off, like `SH_TG`. Tap-toggle count can be changed by defining a value for `TAPPING_TOGGLE`.