Drop the on/off functions

Having function to turn a plugin on and off is not the right way, remove
them.

Fixes #3.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

README.md

@@ -32,8 +32,8 @@ static const Key topsyTurvyList[] PROGMEM = {
 void setup () {
   TopsyTurvy.configure (topsyTurvyList);
   
-  Kaleidoscope.setup (KEYMAP_SIZE);
-  Kaleidoscope.use (&TopsyTurvy, NULL);
+  Kaleidoscope.setup ();
+  USE_PLUGINS (&TopsyTurvy);
 }
 ```
 
@@ -48,16 +48,6 @@ The plugin provides the `TopsyTurvy` object, with the following methods:
 
 > Tells `TopsyTurvy` to use the specified list of keys.
 
-### `.on()`
-
-> Turns the shift-inversion functionality on.
-
-### `.off()`
-
-> Turns the shift-inversion functionality off. In this case, no transformations
-> will be applied, and even if keys pressed appear in the list, they will be
-> ignored until the plugin is turned back on.
-
 ## Further reading
 
 Starting from the [example][plugin:example] is the recommended way of getting

examples/TopsyTurvy/TopsyTurvy.ino

@@ -49,8 +49,8 @@ static const Key topsyTurvyList[] PROGMEM = {
 void setup () {
   TopsyTurvy.configure (topsyTurvyList);
 
-  Kaleidoscope.setup (KEYMAP_SIZE);
-  Kaleidoscope.use (&TopsyTurvy, NULL);
+  Kaleidoscope.setup ();
+  USE_PLUGINS (&TopsyTurvy);
 }
 
 void loop () {

src/Kaleidoscope/TopsyTurvy.cpp

@@ -38,21 +38,6 @@ namespace KaleidoscopePlugins {
     topsyTurvyList = (const Key *)list;
   }
 
-  void
-  TopsyTurvy::on (void) {
-    event_handler_hook_replace (this->noOpHook, this->eventHandlerHook);
-  }
-
-  void
-  TopsyTurvy::off (void) {
-    event_handler_hook_replace (this->eventHandlerHook, this->noOpHook);
-  }
-
-  Key
-  TopsyTurvy::noOpHook (Key mappedKey, byte row, byte col, uint8_t keyState) {
-    return mappedKey;
-  }
-
   Key
   TopsyTurvy::eventHandlerHook (Key mappedKey, byte row, byte col, uint8_t keyState) {
     if (keyState & TOPSYTURVY)

src/Kaleidoscope/TopsyTurvy.h

@@ -29,15 +29,11 @@ namespace KaleidoscopePlugins {
 
     static void configure (const Key topsyTurvyList[]);
 
-    void on (void);
-    void off (void);
-
   private:
     static const Key *topsyTurvyList;
     static uint8_t topsyTurvyModState;
 
     static Key eventHandlerHook (Key mappedKey, byte row, byte col, uint8_t keyState);
-    static Key noOpHook (Key, byte row, byte col, uint8_t keyState);
   };
 };