166 lines
6.1 KiB
C
166 lines
6.1 KiB
C
/* ----------------------------------------------------------------------------
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* key functions : basic : code
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* ----------------------------------------------------------------------------
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* Copyright (c) 2012 Ben Blazak <benblazak.dev@gmail.com>
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* Released under The MIT License (MIT) (see "license.md")
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* Project located at <https://github.com/benblazak/ergodox-firmware>
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* ------------------------------------------------------------------------- */
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#include "../../../main.h"
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#include "../../../keyboard/layout.h"
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#include "../public.h"
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#include "../private.h"
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/*
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* Generate a normal keypress or keyrelease
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*/
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void kbfun_press_release() {
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if (!main_arg_trans_key_pressed) {
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main_arg_any_non_trans_key_pressed = true;
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}
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kbfun_press_release_preserve_sticky();
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}
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/*
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* Generate a normal keypress or keyrelease
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* While basing the sticky key state transition on whether
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* kbfun_press_release() was called after kbfun_transparent() generally
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* works in practice, it is not always the desired behavior. One of the
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* benefits of sticky keys is avoiding key chording, so we want to make sure
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* that standard modifiers do not interrupt the sticky key cycle. Use
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* kbfun_press_release_preserve_sticky() if you want to define a standard
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* modifier key (shift, control, alt, gui) on the sticky layer instead of
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* defining the key to be transparent for the layer.
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*/
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void kbfun_press_release_preserve_sticky() {
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uint8_t keycode = _kbfun_get_keycode();
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_kbfun_press_release(main_arg_is_pressed, keycode);
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}
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/*
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* Toggle the key pressed or unpressed
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*/
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void kbfun_toggle(void) {
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uint8_t keycode = _kbfun_get_keycode();
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bool is_pressed = _kbfun_is_pressed(keycode);
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_kbfun_press_release(!is_pressed, keycode);
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}
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/*
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* Execute the key that would have been executed if the current layer was not
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* active
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*/
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void kbfun_transparent(void) {
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// TODO maybe re-implement this cleaner?
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main_arg_trans_key_pressed = true;
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main_arg_layer_offset++;
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main_arg_layer = main_layers_peek(main_arg_layer_offset);
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main_layers_pressed[main_arg_row][main_arg_col] = main_arg_layer;
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main_exec_key();
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}
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/* ----------------------------------------------------------------------------
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* layer functions
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* ------------------------------------------------------------------------- */
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// enable given layer
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static void layer_enable(uint8_t layer) {
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// Only the topmost layer on the stack should be in sticky once state, pop
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// the top layer if it is in sticky once state
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uint8_t topSticky = main_layers_top_sticky();
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if (topSticky == eStickyOnceDown || topSticky == eStickyOnceUp) {
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main_layers_disable_top();
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}
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main_layers_enable(layer, eStickyNone);
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}
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// disable given layer
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static void layer_disable(uint8_t layer) {
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main_layers_disable(layer);
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}
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/*
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* This function gives similar behavior to sticky keys for modifiers available
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* on most operating systems. It is considered an accessibility feature
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* because it alleviates the user from having to hold down modifiers while
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* pressing a key to produce the modified key function. It is useful for fast
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* touch typing because you can avoid chording motions which both strain your
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* hands and take your hands out of home-row position while pressing normal
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* alpha keys.
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* This function emulates the 3-state behavior which is default on OS X and
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* optional in Windows where the modifier cycles between Off->Once->Locked
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* states. This is particularly handy for symbol layers where you typically
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* only type one symbol before you want to return to unmodified typing (layer
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* 0), e.g. 'if (condition) { a = "b" + "c"; }'. If you assign a symbol layer
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* to a thumb key as a layer sticky cycle, you can type the entire line of
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* code without taking your hands out of home row position and you do not need
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* to toggle off the layer after each symbol is pressed, only immediately
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* before keying the symbol.
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* The exact behavior of the layer sticky cycle function is defined as follows
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* for each state:
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* 1) One time down (set on key press) - The layer was not active and the key
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* has been pressed but not yet released. The layer is pushed in the one
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* time down state.
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* 2) One time up (set on key release) - The layer was active when the layer
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* sticky key was released. If a key on this layer (not set to
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* transparent) was pressed before the key was released, the layer will be
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* popped. If a non-transparent key was not pressed, the layer is popped
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* and pushed again in the one time up state.
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* 3) Locked (set on key press) - The layer was active and in the one time up
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* state when the layer sticky key was pressed again. The layer will be
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* popped if the function is invoked on a subsequent keypress.
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*/
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static void layer_sticky(uint8_t layer) {
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uint8_t topLayer = main_layers_top_layer();
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uint8_t topSticky = main_layers_top_sticky();
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if (main_arg_is_pressed) {
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if (topLayer == layer) {
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if (topSticky == eStickyOnceUp) {
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main_layers_enable(layer, eStickyLock);
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}
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} else {
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// only the topmost layer on the stack should be in sticky once state
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if (topSticky == eStickyOnceDown || topSticky == eStickyOnceUp) {
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main_layers_disable_top();
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}
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main_layers_enable(layer, eStickyOnceDown);
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// this should be the only place we care about this flag being cleared
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main_arg_any_non_trans_key_pressed = false;
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}
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} else {
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if (topLayer == layer) {
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if (topSticky == eStickyOnceDown) {
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// When releasing this sticky key, pop the layer always
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main_layers_disable(layer);
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if (!main_arg_any_non_trans_key_pressed) {
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// If no key defined for this layer (a non-transparent key)
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// was pressed, push the layer again, but in the
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// StickyOnceUp state
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main_layers_enable(layer, eStickyOnceUp);
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}
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}
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}
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}
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}
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// actual functions
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void kbfun_layer_enable(void) {
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uint8_t keycode = _kbfun_get_keycode();
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layer_enable(keycode);
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}
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void kbfun_layer_sticky(void) {
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uint8_t keycode = _kbfun_get_keycode();
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layer_sticky(keycode);
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}
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void kbfun_layer_disable(void) {
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uint8_t keycode = _kbfun_get_keycode();
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layer_disable(keycode);
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}
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