Sparrow Forum

1. 

   niksan
   Moderator

   Me again, sorry, this place is starting to feel like a second home.

   What would be the correct procedurefor gaining a SP_EVENT_TYPE_REMOVED event when for example a child which is attached to us, calls removeFromParent?

   A the moment I have something like this in Game.m

   Title *title = [Title title];
   [self addChild:title];
   [self addEventListener:@selector(onStartGame:) atObject:self forType:SP_EVENT_TYPE_REMOVED];

   Title is just a class derived from SPSprite, and when it does its business I have a call like this.

   [[[[SPStage mainStage] juggler] delayInvocationAtTarget:self byTime:2.0f] removeFromParent];

   So anyone have any pointers as to why onStartGame might not be called? There's no selector exceptions being triggered, it just doesn't seem to fire at all.

   Posted 3 months ago #
2. 

   Shilo
   Master Sparrow

   You need to make sure the event listener is attached to the object that will dispatch the event (unless it bubbles). I assume the last line of code is within the Title class. If that is the case, then "title" will be dispatching the event, you should do this:

   Title *title = [Title title];
   [self addChild:title];
   [title addEventListener:@selector(onStartGame:) atObject:self forType:SP_EVENT_TYPE_REMOVED];

   Posted 3 months ago #
3. 

   niksan
   Moderator

   That did the trick thank you very much, and it makes sense after I debugged it as removeFromParent boils down to parent:removeChild, it would be nice however, if there was an extra event fired from removeFromParent so you can tell how the object was removed and save having to add an event for every child. Also, I'm not at my kit to test but would

   [title addEventListener:@selector(onStartGame:) atObject:self forType:SP_EVENT_TYPE_REMOVED];
   [title addEventListener:@selector(onStartGame:) atObject:title forType:SP_EVENT_TYPE_REMOVED];

   Work? Or can you only register one event on a class of a certain type?

   Posted 3 months ago #
4. 

   Shilo
   Master Sparrow

   You can register multiple event listeners for a single event, so your previous code would work fine as long as you have an onStartGame: in the Title class.

   Posted 3 months ago #

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