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Add back docs for hand-swapping feature.

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Joe Wasson 2018-03-07 00:03:51 -08:00 committed by Jack Humbert
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* [RGB Lighting](feature_rgblight.md)
* [Space Cadet](feature_space_cadet.md)
* [Stenography](feature_stenography.md)
* [Swap Hands](feature_swap_hands.md)
* [Tap Dance](feature_tap_dance.md)
* [Terminal](feature_terminal.md)
* [Thermal Printer](feature_thermal_printer.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:
```C
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. |