Jesse Vincent
7 years ago
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GitHub
commit
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Breaking changes in `MagicCombo`
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================================
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To make `MagicCombo` more portable, and easier to use, we had to break the API
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previously provided, there was no way to maintain backwards compatibility. This
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document is an attempt at guiding you through the process of migrating from the
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earlier API to the current one.
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Migration should be a straightforward process, but if you get stuck, please feel
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free to [open an issue][gh:issues], or start a thread on the [forums][forums],
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and we'll help you with it.
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[gh:issues]: https://github.com/keyboardio/Kaleidoscope-MagicCombo/issues
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[forums]: https://community.keyboard.io/
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## The old API
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```c++
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void magicComboActions(uint8_t combo_index, uint32_t left_hand, uint32_t right_hand) {
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switch (combo_index) {
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case 0:
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Macros.type(PSTR("It's a kind of magic!"));
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break;
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}
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}
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static const kaleidoscope::MagicCombo::combo_t magic_combos[] PROGMEM = {
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{
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R3C6, // left palm key
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R3C9 // right palm key
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},
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{0, 0}
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};
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void setup() {
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Kaleidoscope.setup();
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MagicCombo.magic_combos = magic_combos;
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}
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```
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Previsouly, we used a global, overrideable function (`magicComboActions`) to run
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the actions of all magic combos, similar to how macros are set up to work.
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Unlike macros, magic combos can't be defined in the keymap, due to technical
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reasons, so we had to use a separate list - `magic_combos` in our example. We
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also needed to tell `MagicCombo` to use this list, which is what we've done in
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`setup()`.
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## The new API
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```c++
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void kindOfMagic(uint8_t combo_index) {
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Macros.type(PSTR("It's a kind of magic!"));
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}
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USE_MAGIC_COMBOS({
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.action = kindOfMagic,
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.keys = {R3C6, R3C9} // Left Fn + Right Fn
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});
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```
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The new API is much shorter, and is inspired by the way the [Leader][leader]
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plugin works: instead of having a list, and a dispatching function like
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`magicComboActions`, we include the action method in the list too!
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[leader]: https://github.com/keyboardio/Kaleidoscope-Leader
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We also don't make a difference between left- and right-hand anymore, you can
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just list keys for either in the same list. This will be very handy for
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non-split keyboards.
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## Migration
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First of all, we'll need to split up `magicComboActions` into separate
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functions. Each function should have a unique name, but their shape is always
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the same:
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```c++
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void someFunction(uint8_t combo_index) {
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// Do some action here
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}
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```
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Copy the body of each `case` statement of `magicComboActions`, and copy them one
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by one into appropriately named functions of the above shape. You can name your
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functions anything you want, the only constraint is that they need to be valid
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C++ function names. The plugin itself does nothing with the name, we'll
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reference them later in the `USE_MAGIC_COMBOS` helper macro.
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Once `magicComboActions` is split up, we need to migrate the `magic_combos` list
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to the new format. That list had to be terminated by a `{0, 0}` entry, the new
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method does not require such a sentinel at the end.
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For each entry in `magic_combos`, add an entry to `USE_MAGIC_COMBOS`, with the
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following structure:
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```c++
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{.action = theActionFunction,
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.keys = { /* list of keys */ }}
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```
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The list of keys are the same `RxCy` constants you used for `magic_combos`, with
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the left- and right hands combined. The action, `theActionFunction`, is the
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function you extracted the magic combo action to. It's the function that has the
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same body as the `case` statement in `magicComboActions` had.
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And this is all there is to it.
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If your actions made use of the `left_hand` or `right_hand` arguments of
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`magicComboActions`, the same information is still available. But that's a bit
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more involved to get to, out of scope for this simple migration guide. Please
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open an issue, or ask for help on the forums, and we'll help you.
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