SceneManager issue when transitioning

SimplesApps · December 2012

Hi,
I think I've found a bug in the SceneManager: during a changeScene transition to a screen that contains a button (for example see the Game template), if you press it before the transition ends then the button will go out of the scene.

I suppose have to be with the dispatching of the events for the SceneManager when the transition hasn't ended yet.
Please, let me know your apreciated comments.

Many thanks,
David.

ar2rsawseen · December 2012

@SimplesApps yes you are right
There are four type of events:

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.
exitBegin: Dispatched when your current scene is about to leave the stage. You can remove listeners and stop timers here.

More info: http://appcodingeasy.com/Gideros-Mobile/Manage-Scenes-in-Gideros-Mobile

semp · December 2012

@SimplesApps with latest version 1.0.4 of SceneManager, you can exclude event during execution of transitions.

sceneManager:changeScene(nextScene(), 1, transition, easing.outBack, { eventFilter={Event.MOUSE_DOWN} } )

Maybe you should try this.

SimplesApps · December 2012

Thanks @ar2rsawseen , @semp for your quick responses.

I've tried to fix the issue but it's not solved yet. I described the problem incorrectly because it don't have to be with transition listeners but with button listeners.

You can reproduce it with the @ar2rsawseen game template, for example:
· create a menu (i.e. a VerticalView)
· create a button (with the Button class)
· apply a randomize setPosition&setRotation to the button
· add a EventListener to the button for "click" event
· add the button to the menu
· apply setPosition to the menu (->the button will have new setPosition too)

When you have this sequence in your code for a scene and the user "clicks" the button when is "flying" (going from the randomize position to the menu position) the button will go far away or will exit the scene instead of obeying the "click" listener's function.

Please, let me know if you can reproduced the issue.

Many thanks,
David.

ar2rsawseen · December 2012

@SimplesApps ok I think I know where the problem is.

You call reverse method of View class inside Button click handler, right?

So while the tween is not finished, reverse method invokes another tween on them and thus it gets tweened somewhere where it should not be.

Will need to figure out how to correctly implement tweening inside View class, thank you for report this

ar2rsawseen · December 2012

It seems that the problem is a little deeper after all, although I've reimplemented tweens more efficient, the problem still persists.

And it is because of the scenario, where button is pushed, before scene transition ended.

Thus View:reverse is called returning buttons to original randomized positions, and although sceneManager:changeScene is also called, it is yet ignored, because transition did not end yet.

If you move everything into enterEnd event it works as expected. I've commited modified version, you can check it in start scene in start.lua

Other fixes would be: delay of calling new transition for amount of duration of transition (so it would 100% called when transition ended)

Or modifying Scene manager to stack transition calls and execute them later

Or not calling View:reverse, that way at least button would still be on same place and clickable

SimplesApps · December 2012

@ar2rsawseen thanks! You improve your code quickly and efficiently.

I've checked the changes you have done in start.lua, the view and the popup classes (btw, you removed the Popup:replaceChild method).

As you proposed I moved everything into enterEnd in the start scene and now the bug is fixed but does not work as I would like because the buttons appear after the scene. I prefer that the buttons and the scene appear together.

Therefore I'll think and test other fixes like you propose.
If you have other suggestions please let me know.

Many thanks and Merry Christmas. =D>

ar2rsawseen · December 2012

Well if you need for buttons to appear visually, then you can create buttons inside init method, but add click event listener only inside in enterEnd event

SimplesApps · December 2012

Ok, I created buttons inside init method to appear together within the scene, having global variables for them (local for the whole class).

Thanks @ar2rsawseen!
David.

SinisterSoft · December 2012

I had a question here, started a new thread with it.

Skyrocket · December 2013

I had a similar problem, with a tab bar that is persistent calling scenemanager.

I found that my tab bar buttons changed straight away if I clicked buttons in quick succession, but the scenes just couldn't keep up because of the scene manager tween delay. This resulted in the wrong button being illuminated for the displayed scene.

Problem worked around by removing button listeners prior to calling scenemanager, then reloading them after a delay.

e.g. for a 1 second transition in scenemanager, a 1100ms delay before re-adding the button event listeners works fine. In other words, I am disarming the buttons while the scene transition is occurring. No problemo.

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