Can my game throw runtime events?

Solar2D General Questions/Discussion
#1

Hi,

I’ve read about events in several blog posts and I have a scenario and a question:

To decouple my game component, I want to register them for various custom events and when I need to trigger them, throw those events.

What I understood Corona suggests is table listeners, in other words, meaning that you throw an event on a table/object or any amount that you want.

It doesn’t suit my need because A) I have to remember that which objects needs this event and B) I don’t want to store reference of those table listeners in every scenario that I want to throw event.

So I thought of Runtime events and leads to my question:

Is there any way that I can register my tables/objects to Runtime events, such as we normally do with “touch” event and whatnot, and then when my game needs, I throw those events at Runtime and each of the objects that registered themselves for Runtime, grab the event and handle it?

Example use case:

When one of objects gets hit by a bullet, I throw a “MonsterGotHitWithABullet” and as I previously registered my UI, SFXmanager, FoodSpawner, etc to this event, they all receive this event and each respond accordingly.

Thanks.

#2

Yes, you can generate your own events and listen for them specifically: http://docs.coronalabs.com/daily/api/type/EventListener/dispatchEvent.html

Be aware that if you try to simulate touch or tap events that they will  not propagate down through the display hierarchy.

#3

Thanks, for future reference this can be done:

local function invIncreased(event) print("handle inventory increase from" .. event.target) end local image = display.newImage("image.png") Runtime:addEventListener("MyInventoryHasIncreased", invIncreased) local event = {name="MyInventoryHasIncreased", target=image} Runtime:dispatchEvent(event)

One more thing, at end of the game that all objects are destroyed, how should I remove these listeners?

(Because we know that Runtime event listeners are never removed automatically)

Like this?

Runtime:removeEventListener("FoodWentOutOfTheScreen", ComboManager)
#4

Yes

#5

Yes, you can generate your own events and listen for them specifically: http://docs.coronalabs.com/daily/api/type/EventListener/dispatchEvent.html

Be aware that if you try to simulate touch or tap events that they will  not propagate down through the display hierarchy.

#6

Thanks, for future reference this can be done:

local function invIncreased(event) print("handle inventory increase from" .. event.target) end local image = display.newImage("image.png") Runtime:addEventListener("MyInventoryHasIncreased", invIncreased) local event = {name="MyInventoryHasIncreased", target=image} Runtime:dispatchEvent(event)

One more thing, at end of the game that all objects are destroyed, how should I remove these listeners?

(Because we know that Runtime event listeners are never removed automatically)

Like this?

Runtime:removeEventListener("FoodWentOutOfTheScreen", ComboManager)
#7

Yes