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What would be the case where 'something' should be done onEnterEnd instead of onEnterBegin? — Gideros Forum
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    What would be the case where 'something' should be done onEnterEnd instead of onEnterBegin?

    MellsMells Guru
    edited August 2012 in General questions
    Hi community,

    I am wondering what would be the case where it makes a difference.

    For example, the docs say :

    enterBegin: Dispatched when your new scene is about to enter the stage. You can initialize your variables here.
    enterEnd: Dispatched after the transition of new scene has ended. Mostly, you add listeners and start your logic here.
    Until now I used to initialiaze my variables in Scene:init() and from there I call for example :
    • Scene:createMenu() where I create the menu (add Buttons and event listeners)
    • Scene:addPlayer() where all things about the Player would happen
    I am trying to better organize my code and be sure to keep track of all timers, event listeners.

    So :
    1. What would be the benefit for me to modify my code and use Events like "onEnterBegin", "onEnterEnd"?
    2. What would be a clear case where the separation of my code between onEnterBegin and onEnterEnd would make a clear difference
    Thank you
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      Accepted Answer
      I'd say it only changes if you want your objects to be seen on scene during the transition. Or only appear after scene transition is completed.
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    • techdojotechdojo Guru
      Accepted Answer
      In my scene manager code I have four callback handlers setup which are fired during the scene transition phase.

      Here's a copy of my scene template file.
      SceneTemplate = Core.class(Sprite)
 
 
-- Called when the scene is first created.
function SceneTemplate:init( data )	
end
 
-- Called once per frame when the scene is active
function SceneTemplate:onUpdate( data )		
end
 
-- Called BEFORE scene has moved onscreen (before the transition starts)
function SceneTemplate:enterSceneStart( data ) 
	--print("SceneTemplate:enterSceneStart")
end
 
-- Called immediately after scene has moved onscreen (when the transition ends)
function SceneTemplate:enterSceneEnd( data ) 
	--print("SceneTemplate:enterSceneEnd")
end
 
-- Called when scene is about to move offscreen (before the transition starts)
function SceneTemplate:exitSceneStart( data ) 
	--print("SceneTemplate:exitSceneStart")
end
 
-- Called AFTER scene has finished moving offscreen (when the transition ends)
function SceneTemplate:exitSceneEnd( data ) 
	--print("SceneTemplate:exitSceneEnd")
end
 
-- Called prior to the removal of a scene (after a purge/remove scene call - free up all resources)
function SceneTemplate:destroyScene( data ) 
	--print("SceneTemplate:destroyScene")
end
-- End of file...
      I use the enterSceneStart() function to create / initialise any screen components / widgets etc so they are ready before the scene transitions in. I use the enterSceneEnd() function to activate the widgets so you can't do silly things like press buttons or change tabs during the transition phase.

      Likewise in the exitSceneStart() function I disable all widgets / controls etc for the same reason and then in the exitSceneEnd() function I remove / destroy any non-permanent resources allocated during enterSceneStart().

      That structure helps to keep my code neat and tidy and means that I don't forget to release resources, leak memory etc.
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    • MellsMells Guru
      Thank you, it makes a lot of sense.
      Those informations will probably be helpful for a lot of new users of Gideros.

      I'm back to work and will implement those changes.
      twitter@TheWindApps Artful applications : The Wind Forest. #art #japan #apps
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