allow audio engine to react to keyboard inputs

src/main.cpp

@@ -17,8 +17,20 @@ int main(int argc, char* argv[]) {
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
 
+    
+    // create app objects
+    ConfigService config = ConfigService("config/sonobulus.cfg");
+    LoggerService logger = LoggerService(&config, "Engine");
+    NoteQueue queue = NoteQueue();
+    KeyboardController keyboard(&config, &logger, &queue);
+
+    // audio synthesizer doohickey
+    AudioEngine audioEngine = AudioEngine(&config, &logger, &queue);
+    audioEngine.start();
+
     // attach backend gui components
     qmlRegisterType<TimerComponent>("AppDemo", 1, 0, "TimerComponent");
+    engine.rootContext()->setContextProperty("keyboardController", &keyboard);
     // adds the TimerComponent type (exposed in qml as "TimerComponent") to the module named"AppDemo" (numbers mean version 1.0)
 
     // load qml
@@ -31,16 +43,6 @@ int main(int argc, char* argv[]) {
         return -1;
     }
 
-    // create app objects
-    ConfigService config = ConfigService("config/sonobulus.cfg");
-    LoggerService logger = LoggerService(&config, "Engine");
-    NoteQueue queue = NoteQueue();
-    KeyboardController keyboard = KeyboardController(&config, &logger, &queue);
-
-    // audio synthesizer doohickey
-    AudioEngine audioEngine = AudioEngine(&logger);
-    audioEngine.start();
-
     // execute app
     return app.exec();
 }