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Platformer with Level Editor

 import Felgo 3.0
 import QtQuick 2.0
 import QtMultimedia 5.0

 Item {
   id: audioManager

   Component.onCompleted: handleMusic()

   /**
    * Background Music ----------------------------------
    */
   BackgroundMusic {
     id: menuMusic

     autoPlay: false

     source: "../../assets/audio/music/menuMusic.mp3"
   }

   BackgroundMusic {
     id: playMusic

     autoPlay: false

     source: "../../assets/audio/music/playMusic.mp3"
   }

   BackgroundMusic {
     id: editMusic

     autoPlay: false

     source: "../../assets/audio/music/editMusic.mp3"
   }

   /**
    * Sounds ----------------------------------
    */
   SoundEffect {
     id: playerJump
     source: "../../assets/audio/sounds/phaseJump1.wav"
   }

   SoundEffect {
     id: playerHit
     source: "../../assets/audio/sounds/whizz.wav"
   }

   SoundEffect {
     id: playerDie
     source: "../../assets/audio/sounds/lose.wav"
   }

   SoundEffect {
     id: playerInvincible
     source: "../../assets/audio/sounds/threeTone2.wav"
     loops: SoundEffect.Infinite
   }

   SoundEffect {
     id: collectCoin
     source: "../../assets/audio/sounds/coin_3.wav"
   }

   SoundEffect {
     id: collectMushroom
     source: "../../assets/audio/sounds/zapThreeToneUp.wav"
   }

   SoundEffect {
     id: finish
     source: "../../assets/audio/sounds/coin-04.wav"
   }

   SoundEffect {
     id: opponentWalkerDie
     source: "../../assets/audio/sounds/bird-chirp.wav"
   }

   SoundEffect {
     id: opponentJumperDie
     source: "../../assets/audio/sounds/twitch.wav"
   }

   SoundEffect {
     id: start
     source: "../../assets/audio/sounds/yahoo.wav"
   }

   SoundEffect {
     id: click
     source: "../../assets/audio/sounds/click1.wav"
   }

   SoundEffect {
     id: dragEntity
     source: "../../assets/audio/sounds/slide-network.wav"
   }

   SoundEffect {
     id: createOrDropEntity
     source: "../../assets/audio/sounds/tap_professional.wav"
   }

   SoundEffect {
     id: removeEntity
     source: "../../assets/audio/sounds/tap_mellow.wav"
   }

   // this function sets the music, depending on the current scene and the gameScene's state
   function handleMusic() {
     if(activeScene === gameScene) {
       if(gameScene.state == "play" || gameScene.state == "test")
         audioManager.startMusic(playMusic)
       else if(gameScene.state == "edit")
         audioManager.startMusic(editMusic)
     }
     else {
       audioManager.startMusic(menuMusic)
     }
   }

   // starts the given music
   function startMusic(music) {
     // if music is already playing, we don't have to do anything
     if(music.playing)
       return

     // otherwise stop all music tracks
     menuMusic.stop()
     playMusic.stop()
     editMusic.stop()

     // play the music
     music.play()
   }

   // play the sound effect with the given name
   function playSound(sound) {
     if(sound === "playerJump")
       playerJump.play()
       else if(sound === "playerHit")
       playerHit.play()
     else if(sound === "playerDie")
       playerDie.play()
     else if(sound === "playerInvincible")
       playerInvincible.play()
     else if(sound === "collectCoin")
       collectCoin.play()
       else if(sound === "collectMushroom")
       collectMushroom.play()
     else if(sound === "finish")
       finish.play()
     else if(sound === "opponentWalkerDie")
       opponentWalkerDie.play()
     else if(sound === "opponentJumperDie")
       opponentJumperDie.play()
     else if(sound === "start")
       start.play()
     else if(sound === "click")
       click.play()
     else if(sound === "dragEntity")
       dragEntity.play()
     else if(sound === "createOrDropEntity")
       createOrDropEntity.play()
     else if(sound === "removeEntity")
       removeEntity.play()
     else
       console.debug("unknown sound name:", sound)
   }

   // stop the sound effect with the given name
   function stopSound(sound) {
     if(sound === "playerInvincible")
       playerInvincible.stop()
     else