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216 lines
9.3 KiB
216 lines
9.3 KiB
# Qukeys
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## Concept
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This Kaleidoscope plugin allows you to overload keys on your keyboard so that
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they produce one keycode (i.e. symbol) when tapped, and a different keycode --
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most likely a modifier (e.g. `shift` or `alt`) -- when held. The name is a play
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on the term _qubit_; a qukey is a "quantum key". When it is first pressed it is
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in a superposition of states until some event determines which state it ends up
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in. While a qukey is in this indeterminate state, its key press event and any
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subsequent key presses are delayed until something determines the qukey's
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ultimate state.
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Most likely, what determines the qukey's state (_primary_ or _alternate_) is the
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release of a key; if the qukey is released before a subsequent key, it will take
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on its primary value (most likely a printable character), but if the subsequent
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key is released first, it will take on its alternate value (usually a modifier).
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Qukeys is designed to make it practical to use these overloaded keys on the home
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row, where similar designs have historically been problematic. For some typists
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(particularly those who are accustomed to rolling over from modifiers to
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modified keys, rather than deliberately holding the modifier until the
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subsequent key has been released), this may still not work perfectly with
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Qukeys, but some people have reported good results with home-row qukeys.
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## Setup
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- Include the header file:
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```
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#include <Kaleidoscope-Qukeys.h>
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```
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- Use the plugin in the `KALEIDOSCOPE_INIT_PLUGINS` macro:
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```
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KALEIDOSCOPE_INIT_PLUGINS(Qukeys);
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```
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- Define some `Qukeys` of the format `Qukey(layer, key_addr, alternate_key)`.
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Layers and key addresses are all zero-indexed, in key addresses rows are top to bottom and
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columns are left to right:
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- For the Keyboardio Model 01, key coordinates refer to [this header
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file](https://github.com/keyboardio/Kaleidoscope/blob/master/src/kaleidoscope/device/keyboardio/Model01.h#L167-L179).
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```
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QUKEYS(
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// left-side modifiers
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kaleidoscope::plugin::Qukey(0, KeyAddr(2, 1), Key_LeftGui), // A
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kaleidoscope::plugin::Qukey(0, KeyAddr(2, 2), Key_LeftAlt), // S
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kaleidoscope::plugin::Qukey(0, KeyAddr(2, 3), Key_LeftControl), // D
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kaleidoscope::plugin::Qukey(0, KeyAddr(2, 4), Key_LeftShift), // F
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// left-side layer shifts
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kaleidoscope::plugin::Qukey(0, KeyAddr(3, 3), ShiftToLayer(NUMPAD)), // C
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kaleidoscope::plugin::Qukey(0, KeyAddr(3, 4), ShiftToLayer(FUNCTION)), // V
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```
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`Qukeys` will work best if it's the first plugin in the `INIT()` list, because when typing
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overlap occurs, it will (temporarily) mask keys and block them from being processed by
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other plugins. If those other plugins handle the keypress events first, it may not work as
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expected. It doesn't _need_ to be first, but if it's `INIT()`'d after another plugin that
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handles typing events, especially one that sends extra keyboard HID reports, it is more
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likely to generate errors and out-of-order events.
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## Configuration
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### `.setHoldTimeout(timeout)`
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> Sets the time (in milliseconds) after which a qukey held on its own will take
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> on its alternate state. Note: this is not the primary determining factor for a
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> qukey's state. It is not necessary to wait this long before pressing a key
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> that should be modified by the qukey's alternate value. The primary function
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> of this timeout is so that a qukey can be used as a modifier for an separate
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> pointing device (i.e. `shift` + `click`).
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>
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> Defaults to `250`.
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### `.setOverlapThreshold(percentage)`
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> This sets a variable that allows the user to roll over from a qukey to a
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> subsequent key (i.e. the qukey is released first), and still get the qukey's
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> alternate (modifier) state.
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>
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> The `percentage` parameter should be between `1` and `100` (`75` means 75%),
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> and represents the fraction of the _subsequent_ key press's duration that
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> overlaps with the qukey's press. If the subsequent key is released soon enough
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> after the qukey is released, the percentage overlap will be high, and the
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> qukey will take on its alternate (modifier) value. If, on the other hand, the
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> subsequent key is held longer after the qukey is released, the qukey will take
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> on its primary (non-modifier) value.
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>
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> Setting `percentage` to a low value (e.g. `30`) will result in a longer grace
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> period. If you're getting primary values when you intended modifiers, try
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> decreasing this setting. If, on the other hand, you start getting modifiers
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> when you intend primary values, try increasing this setting. If you're getting
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> both, the only solution is to change your typing habits, unfortunately.
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>
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> Defaults to `80`.
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### `.activate()`
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### `.deactivate()`
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### `.toggle()`
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> Activate/deactivate `Qukeys` plugin.
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### DualUse key definitions
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In addition to normal `Qukeys` described above, Kaleidoscope-Qukeys also treats
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DualUse keys in the keymap as `Qukeys`. This makes `Qukeys` a drop-in replacement
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for the `DualUse` plugin, without the need to edit the keymap.
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The plugin provides a number of macros one can use in keymap definitions:
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#### `CTL_T(key)`
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> A key that acts as the *left* `Control` when held, or used in conjunction with
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> other keys, but as `key` when tapped in isolation. The `key` argument must be
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> a plain old key, and can't have any modifiers or anything else applied.
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#### `ALT_T(key)`
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> A key that acts as the *left* `Alt` when held, or used in conjunction with
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> other keys, but as `key` when tapped in isolation. The `key` argument must be
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> a plain old key, and can't have any modifiers or anything else applied.
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#### `SFT_T(key)`
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> A key that acts as the *left* `Shift` when held, or used in conjunction with
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> other keys, but as `key` when tapped in isolation. The `key` argument must be
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> a plain old key, and can't have any modifiers or anything else applied.
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#### `GUI_T(key)`
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> A key that acts as the *left* `GUI` when held, or used in conjunction with
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> other keys, but as `key` when tapped in isolation. The `key` argument must be
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> a plain old key, and can't have any modifiers or anything else applied.
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#### `MT(mod, key)`
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> A key that acts as `mod` when held, or used in conjunction with other keys,
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> but as `key` when tapped in isolation. The `key` argument must be a plain old
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> key, and can't have any modifiers or anything else applied. The `mod` argument
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> can be any of the modifiers, *left* or *right* alike.
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#### `LT(layer, key)`
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> A key that momentarily switches to `layer` when held, or used in conjunction
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> with other keys, but as `key` when tapped in isolation. The `key` argument
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> must be a plain old key, and can't have any modifiers or anything else
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> applied.
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DualUse keys are more limited than `Qukey` definitions, which can contain any
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valid `Key` value for both the primary and alternate keys, but they take up less
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space in program memory, and are just as functional for typical definitions.
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### SpaceCadet Emulation
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It is possible to define a `Qukey` on a key with a _primary_ value that is a
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modifier. In this case, the qukey is treated specially, and the _primary_ value
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is used when the key is held, rather than the alternate value. The _alternate_
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value is only used if the qukey is tapped on its own, without rolling over to
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any other key. This is a reasonable facsimile of the behaviour of the SpaceCadet
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plugin, and is much more suitable for keys that are mainly used as modifiers,
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with an additional "tap" feature.
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In addition to working this way on keyboard modifiers (`shift`, `control`, _et
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al_), this works for keys that are primarily layer shift keys
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(e.g. `ShiftToLayer(N)`).
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As an added bonus, if Qukeys is deactivated, such a key reverts to being a
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modifier, because that's what's in the keymap.
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### The Wildcard Layer
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There is a special value (`Qukeys::layer_wildcard`) that can be used in place of
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the layer number in the definition of a `Qukey`. This will define a qukey with
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the given alternate value on all layers, regardless of what the primary value is
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for that key on the top currently active layer.
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## Design & Implementation
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When a qukey is pressed, it doesn't immediately add a corresponding keycode to
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the HID report; it adds that key to a queue, and waits until one of three things
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happens:
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1. the qukey is released
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1. a subsequently-pressed key is released
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1. a time limit is reached
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Until one of those conditions is met, all subsequent keypresses are simply added
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to the queue, and no new reports are sent to the host. Once a condition is met,
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the qukey is flushed from the queue, and so are any subsequent keypresses (up
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to, but not including, the next qukey that is still pressed).
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Basically, if you hold the qukey, then press and release some other key, you'll
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get the alternate keycode (probably a modifier) for the qukey, even if you don't
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wait for a timeout. If you're typing quickly, and there's some overlap between
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two keypresses, you won't get the alternate keycode, and the keys will be
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reported in the order that they were pressed -- as long as the keys are released
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in the same order they were pressed.
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The time limit is mainly there so that a qukey can be used as a modifier (in its
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alternate state) with a second input device (e.g. a mouse). It can be quite
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short (200ms is probably short enough) -- as long as your "taps" while typing
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are shorter than the time limit, you won't get any unintended alternate
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keycodes.
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## Further reading
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The [example][plugin:example] can help to learn how to use this plugin.
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[plugin:example]: ../../examples/Keystrokes/Qukeys/Qukeys.ino
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