LEDControl: Add disable/enable functions, and a toggle key

This adds `LEDControl.disable()` and `LEDControl.enable()` which disable and
enable LED operations, respectively. These are meant to replace the current
`LEDControl.paused` property (which is getting deprecated with this change), and
do some additional work on top of just disabling or re-enabling future updates
and sync. Namely, `disable()` will also turn LEDs off, while `enable()` will
refresh them all, too.

We also add a dedicated `Key_LEDToggle` key to disable/enable LEDs. This is
useful when one wants to turn LEDs off, without changing active LED mode to
`LEDOff`.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

docs/NEWS.md

@@ -172,6 +172,13 @@ deprecation warnings during compile.
 Please see the [relevant upgrade notes](UPGRADING.md##implementation-of-type-key-internally-changed-from-union-to-class)
 for information about how to upgrade legacy code.
 
+### `LEDControl.paused` has been deprecated
+
+The `.paused` property of `LEDControl` has been deprecated in favour of the new
+`LEDControl.disable()` and `LEDControl.enable()` methods. These two will turn
+off or refresh the LEDs, respectively, along with disabling or re-enabling
+future updates and syncs.
+
 ### The `NumPad` plugin no longer toggles `NumLock`
 
 The `NumPad` plugin used to toggle `NumLock` when switching to the NumPad layer. This caused issues on OSX where `NumLock` is interpreted as `Clear`. For this reason, the plugin no longer does this. As a consequence, everyone's encouraged to update their keymap so that the numpad layer uses normal number keys instead of the keypad numbers. See [Model01-Firmware#79](https://github.com/keyboardio/Model01-Firmware/pull/79) for an example about how to do this.

docs/UPGRADING.md

@@ -13,6 +13,7 @@ If any of this does not make sense to you, or you have trouble updating your .in
     - [Consistent timing](#consistent-timing)
   + [Breaking changes](#breaking-changes)
     - [Implementation of type Key internally changed from C++ union to class](#implementation-of-type-key-internally-changed-from-union-to-class)
+    - [`LEDControl.paused` has been deprecated](#ledcontrolpaused-has-been-deprecated)
     - [The `RxCy` macros and peeking into the keyswitch state](#the-rxcy-macros-and-peeking-into-the-keyswitch-state)
     - [HostOS](#hostos)
     - [MagicCombo](#magiccombo)
@@ -353,6 +354,44 @@ k.setKeyCode(Key_A.getKeyCode());
 k.setFlags(Key_A.getFlags());
 ```
 
+### `LEDControl.paused` has been deprecated
+
+Wherever we used `LEDControl.paused`, we'll need to use one of
+`LEDControl.disable()`, `LEDControl.enable()`, or `LEDControl.isEnabled()`
+instead. `LEDControl.paused` will still compile, but will emit deprecation
+warnings, and will be removed after **2020-03-15**.
+
+Keep in mind that `.enable()` and `.disable()` do more than what `paused` did:
+they will refresh and turn off LEDs too, respectively.
+
+A few examples to show how to transition to the new APIs follow, old use first, new second.
+
+```c++
+if (someCondition) {
+  LEDControl.set_all_leds_to({0, 0, 0});
+  LEDControl.syncLeds();
+  LEDControl.paused = true;
+} else if (someOtherCondition) {
+  LEDControl.paused = false;
+  LEDControl.refreshAll();
+}
+
+if (LEDControl.paused) {
+ // do things...
+}
+```
+
+```c++
+if (someCondition) {
+  LEDControl.disable();
+} else if (someOtherCondition) {
+  LEDControl.enable();
+}
+if (!LEDControl.isEnabled()) {
+  // do things...
+}
+```
+
 ### The `RxCy` macros and peeking into the keyswitch state
 
 The `RxCy` macros changed from being indexes into a per-hand bitmap to being an

examples/Devices/Keyboardio/Imago/Imago.ino

@@ -1,6 +1,6 @@
 /* -*- mode: c++ -*-
  * Imago.ino -- Example sketch for the Keyboardio Imago
- * Copyright (C) 2018, 2019  Keyboard.io, Inc
+ * Copyright (C) 2018, 2019, 2020  Keyboard.io, Inc
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -91,13 +91,10 @@ static kaleidoscope::plugin::LEDSolidColor solidViolet(130, 0, 120);
 void toggleLedsOnSuspendResume(kaleidoscope::plugin::HostPowerManagement::Event event) {
   switch (event) {
   case kaleidoscope::plugin::HostPowerManagement::Suspend:
-    LEDControl.set_all_leds_to({0, 0, 0});
+    LEDControl.disable();
-    LEDControl.syncLeds();
-    LEDControl.paused = true;
     break;
   case kaleidoscope::plugin::HostPowerManagement::Resume:
-    LEDControl.paused = false;
+    LEDControl.enable();
-    LEDControl.refreshAll();
     break;
   case kaleidoscope::plugin::HostPowerManagement::Sleep:
     break;

examples/Features/HostPowerManagement/HostPowerManagement.ino

@@ -1,6 +1,6 @@
 /* -*- mode: c++ -*-
  * Kaleidoscope-HostPowerManagement -- Host power management support plugin.
- * Copyright (C) 2017, 2018  Gergely Nagy
+ * Copyright (C) 2017, 2018, 2020  Keyboard.io, Inc
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,13 +46,10 @@ KEYMAPS(
 void hostPowerManagementEventHandler(kaleidoscope::plugin::HostPowerManagement::Event event) {
   switch (event) {
   case kaleidoscope::plugin::HostPowerManagement::Suspend:
-    LEDControl.paused = true;
+    LEDControl.disable();
-    LEDControl.set_all_leds_to({0, 0, 0});
-    LEDControl.syncLeds();
     break;
   case kaleidoscope::plugin::HostPowerManagement::Resume:
-    LEDControl.paused = false;
+    LEDControl.enable();
-    LEDControl.refreshAll();
     break;
   case kaleidoscope::plugin::HostPowerManagement::Sleep:
     break;

src/kaleidoscope/plugin/IdleLEDs.cpp

@@ -1,6 +1,6 @@
 /* -*- mode: c++ -*-
  * Kaleidoscope-Idle-LEDs -- Turn off the LEDs when the keyboard's idle
- * Copyright (C) 2018, 2019  Keyboard.io, Inc
+ * Copyright (C) 2018, 2019, 2020  Keyboard.io, Inc
  * Copyright (C) 2019  Dygma, Inc
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -36,12 +36,9 @@ void IdleLEDs::setIdleTimeoutSeconds(uint32_t new_limit) {
 }
 
 EventHandlerResult IdleLEDs::beforeEachCycle() {
-  if (!::LEDControl.paused &&
+  if (::LEDControl.isEnabled() &&
       Runtime.hasTimeExpired(start_time_, idle_time_limit)) {
-    ::LEDControl.set_all_leds_to(CRGB(0, 0, 0));
+    ::LEDControl.disable();
-    ::LEDControl.syncLeds();
-
-    ::LEDControl.paused = true;
   }
 
   return EventHandlerResult::OK;
@@ -49,9 +46,8 @@ EventHandlerResult IdleLEDs::beforeEachCycle() {
 
 EventHandlerResult IdleLEDs::onKeyswitchEvent(Key &mapped_key, KeyAddr key_addr, uint8_t key_state) {
 
-  if (::LEDControl.paused) {
+  if (!::LEDControl.isEnabled()) {
-    ::LEDControl.paused = false;
+    ::LEDControl.enable();
-    ::LEDControl.refreshAll();
   }
 
   start_time_ = Runtime.millisAtCycleStart();

src/kaleidoscope/plugin/LEDControl.cpp

@@ -1,5 +1,5 @@
 /* Kaleidoscope-LEDControl - LED control plugin for Kaleidoscope
- * Copyright (C) 2017-2018  Keyboard.io, Inc.
+ * Copyright (C) 2017-2020  Keyboard.io, Inc.
  *
  * This program is free software: you can redistribute it and/or modify it under
  * the terms of the GNU General Public License as published by the Free Software
@@ -31,7 +31,7 @@ uint8_t LEDControl::num_led_modes_ = LEDModeManager::numLEDModes();
 LEDMode *LEDControl::cur_led_mode_;
 uint8_t LEDControl::syncDelay = 32;
 uint16_t LEDControl::syncTimer = 0;
-bool LEDControl::paused = false;
+bool LEDControl::enabled_ = true;
 
 LEDControl::LEDControl(void) {
 }
@@ -120,7 +120,7 @@ cRGB LEDControl::getCrgbAt(KeyAddr key_addr) {
 }
 
 void LEDControl::syncLeds(void) {
-  if (paused)
+  if (!enabled_)
     return;
 
   Runtime.device().syncLeds();
@@ -138,6 +138,18 @@ kaleidoscope::EventHandlerResult LEDControl::onSetup() {
   return EventHandlerResult::OK;
 }
 
+void LEDControl::disable() {
+  set_all_leds_to(CRGB(0, 0, 0));
+  Runtime.device().syncLeds();
+  enabled_ = false;
+}
+
+void LEDControl::enable() {
+  enabled_ = true;
+  refreshAll();
+  Runtime.device().syncLeds();
+}
+
 kaleidoscope::EventHandlerResult LEDControl::onKeyswitchEvent(Key &mappedKey, KeyAddr key_addr, uint8_t keyState) {
   if (mappedKey.getFlags() != (SYNTHETIC | IS_INTERNAL | LED_TOGGLE))
     return kaleidoscope::EventHandlerResult::OK;
@@ -147,6 +159,11 @@ kaleidoscope::EventHandlerResult LEDControl::onKeyswitchEvent(Key &mappedKey, Ke
       next_mode();
     } else if (mappedKey == Key_LEDEffectPrevious) {
       prev_mode();
+    } else if (mappedKey == Key_LEDToggle) {
+      if (enabled_)
+        disable();
+      else
+        enable();
     }
   }
 
@@ -154,7 +171,7 @@ kaleidoscope::EventHandlerResult LEDControl::onKeyswitchEvent(Key &mappedKey, Ke
 }
 
 kaleidoscope::EventHandlerResult LEDControl::beforeReportingState(void) {
-  if (paused)
+  if (!enabled_)
     return kaleidoscope::EventHandlerResult::OK;
 
   if (Runtime.hasTimeExpired(syncTimer, syncDelay)) {

src/kaleidoscope/plugin/LEDControl.h

@@ -1,5 +1,5 @@
 /* Kaleidoscope-LEDControl - LED control plugin for Kaleidoscope
- * Copyright (C) 2017-2018  Keyboard.io, Inc.
+ * Copyright (C) 2017-2020  Keyboard.io, Inc.
  *
  * This program is free software: you can redistribute it and/or modify it under
  * the terms of the GNU General Public License as published by the Free Software
@@ -23,6 +23,7 @@
 
 #define Key_LEDEffectNext Key(0, KEY_FLAGS | SYNTHETIC | IS_INTERNAL | LED_TOGGLE)
 #define Key_LEDEffectPrevious Key(1, KEY_FLAGS | SYNTHETIC | IS_INTERNAL | LED_TOGGLE)
+#define Key_LEDToggle Key(2, KEY_FLAGS | SYNTHETIC | IS_INTERNAL | LED_TOGGLE)
 
 #define _DEPRECATED_MESSAGE_LED_CONTROL_MODE_ADD                               \
   "LEDControl::mode_add(LEDMode *mode) is deprecated. LEDModes are now \n"     \
@@ -73,7 +74,7 @@ class LEDControl : public kaleidoscope::Plugin {
     if (!Runtime.has_leds)
       return;
 
-    if (paused)
+    if (!enabled_)
       return;
 
     set_all_leds_to({0, 0, 0});
@@ -108,17 +109,51 @@ class LEDControl : public kaleidoscope::Plugin {
   static void activate(LEDModeInterface *plugin);
 
   static uint8_t syncDelay;
-  static bool paused;
 
   kaleidoscope::EventHandlerResult onSetup();
   kaleidoscope::EventHandlerResult onKeyswitchEvent(Key &mappedKey, KeyAddr key_addr, uint8_t keyState);
   kaleidoscope::EventHandlerResult beforeReportingState();
 
+  static void disable();
+  static void enable();
+  static bool isEnabled() {
+    return enabled_;
+  }
+
+  // The data proxy objects are required to only emit deprecation
+  // messages when the `paused` property is accessed directly.
+  //
+  // Once the deprecation period elapsed, the proxy class and the proxied
+  // `paused` property can be safely removed.
+  class DataProxy {
+   public:
+    DataProxy() = default;
+
+    //constexpr DataProxy(bool value) : value_{value} {}
+
+    DEPRECATED(DIRECT_LEDCONTROL_PAUSED_ACCESS)
+    DataProxy &operator=(bool value) {
+      if (value)
+        disable();
+      else
+        enable();
+      return *this;
+    }
+
+    DEPRECATED(DIRECT_LEDCONTROL_PAUSED_ACCESS)
+    operator bool () const {
+      return !isEnabled();
+    }
+  };
+
+  DataProxy paused;
+
  private:
   static uint16_t syncTimer;
   static uint8_t mode_id;
   static uint8_t num_led_modes_;
   static LEDMode *cur_led_mode_;
+  static bool enabled_;
 };
 
 class FocusLEDCommand : public Plugin {

src/kaleidoscope_internal/deprecations.h

@@ -1,5 +1,5 @@
 /* Kaleidoscope - Firmware for computer input devices
- * Copyright (C) 2013-2018  Keyboard.io, Inc.
+ * Copyright (C) 2013-2020  Keyboard.io, Inc.
  *
  * This program is free software: you can redistribute it and/or modify it under
  * the terms of the GNU General Public License as published by the Free Software
@@ -66,6 +66,13 @@
   "For further information and examples on how to do that, \n"                 \
   "please see UPGRADING.md."
 
+#define _DEPRECATED_MESSAGE_DIRECT_LEDCONTROL_PAUSED_ACCESS                \
+  "Direct access to `LEDControl.paused` is deprecated.\n"                  \
+  "Please use `LEDControl.disable()` and `LEDControl.enable()` instead.\n" \
+  "\n"                                                                     \
+  "For further information and examples on how to do that, please see\n"   \
+  "UPGRADING.md"
+
 #define _DEPRECATED_MESSAGE_KEY_MEMBER_RAW_ACCESS                              \
   "The member variable `raw` of class Key had to be removed. Please \n"        \
   "use `Key::setRaw()`/`Key::getRaw()` to set and get raw data.\n"             \