Building the Flak Cannon Game Loop - The Essential Guide to Flash Games - page 175

public function systemNewGame():void {
addChild(game);
game.addEventListener(CustomEventScoreBoardUpdate.UPDATE_TEXT,

scoreBoardUpdateListener, false, 0, true);
game.addEventListener(CustomEventLevelScreenUpdate.UPDATE_TEXT,

levelScreenUpdateListener, false, 0, true);
game.addEventListener(CustomEventSound.PLAY_SOUND, soundEventListener,

false, 0, true);
game.addEventListener(Game.GAME_OVER, gameOverListener, false, 0, true);
game.addEventListener(Game.NEW_LEVEL, newLevelListener, false, 0, true);
game.newGame();
switchSystemState(FrameWorkStates.STATE_SYSTEM_NEW_LEVEL);
}

Note that many developers like to use naming convention onXxxxxEvent() to name callback
functions for events. This is a fine way to name your events, and if you feel like renaming the
events in this topic to match that style you are more than welcome to do so.

We also need to remove the EventListener when the game is over. To do that, we add another
line of code to the gameOverListener() function:
public function gameOverListener(e:Event):void {
switchSystemState(FrameWorkStates.STATE_SYSTEM_GAME_OVER);
game.removeEventListener(CustomEventScoreBoardUpdate.UPDATE_TEXT,

scoreBoardUpdateListener);
game.removeEventListener(CustomEventLevelScreenUpdate.UPDATE_TEXT,

levelScreenUpdateListener);
game.removeEventListener(CustomEventSound.PLAY_SOUND, soundEventListener);
game.removeEventListener(Game.GAME_OVER, gameOverListener);
game.removeEventListener(Game.NEW_LEVEL, newLevelListener);
}
The soundEventListener() function is brand new in the GameFrameWork class. When the
CustomEventSound event is dispatched, we will set all the properties of the CustomEventSound
object necessary to play a sound. As a review, those properties follow:

type : This String defines the type of event, either CustomSoundevent. PLAY_SOUND or
CustomSoundevent.STOP_SOUND

name : This String determines the sound to play. Values are static const s defined in
Main.as : Main.SOUND_XXX

isSoundTrack : This Boolean indicated whether to consider this sound a soundtrack when
playing.

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Note We will talk about playing sound tracks in Chapter 8.

loops : This int sets the number of times to loop the sound when playing.