How to add an event to the composer screen and how to dispatch it?

[vik_b_it]

Hi,

I have created a new scene using the composer.  But how do I add my own event into it?

I tried the following,

-- Listener setup scene:addEventListener( "create", scene ) scene:addEventListener( "show", scene ) scene:addEventListener( "hide", scene ) scene:addEventListener( "destroy", scene ) scene:addEventListener("gameEnd", scene) -- this is my own one

Then how do I call it from another object?   I have a character object, when the character dies I want to dispatch an event to say to dispatch “gameEnd” event

[RedBeach]

Composer is not supposed to work that way. You should create a new composer lua file (you can call it game-end.lua) and then call composer.gotoScene(“game-end”, params).

You can read more here:  http://docs.coronalabs.com/api/library/composer/index.html

[vik_b_it]

Renato,

if my gameEnd listener handler that’s exactly what I have…

But the issue I am having is how do I call the event?  The event should happen when the character object dies… when the character dies I want to dispatch the event, which in turn will call the event handler…

I hope that makes sense

[RedBeach]

I understand that you already have a function called gameEnd, is that right? So just call this function when the characters dies. You don’t have to add events.

[jonjonsson]

You can dispatch custom events if you want. See http://docs.coronalabs.com/daily/api/type/EventListener/dispatchEvent.html

So when your character dies you could perhaps do:

[lua]

scene:dispatchEvent( { name=“gameEnd”, target=characterGroup } )

[/lua]

Personally I would make a character module and do something like:

[lua]

– character.lua

local M = display.newGroup()

– Add your stuff to this group

local function died()

   M:dispatchEvent({name = “gameEnd”})

end

return M

[/lua]

[lua]

– Main gama lua file

local character = require(character)

character:addEventListener(“gameEnd”, someFunction) 

[/lua]

If you want to get really fancy: http://www.omidahourai.com/from-zero-to-oo-ardentkids-guide-to-object-oriented-lua-with-corona-sdk

[vik_b_it]

jonjonsson,

I am already using OO with the middleclass library… and yeah I already have a separate class for the character

I am using the composer for scene management

local composer = require( "composer" ) local scene = composer.newScene() --------------------------------------------------------------------------------- -- All code outside of the listener functions will only be executed ONCE -- unless "composer.removeScene()" is called. --------------------------------------------------------------------------------- -- local forward references should go here --------------------------------------------------------------------------------- -- "scene:create()" function scene:create( event ) local sceneGroup = self.view self.character = new character(self.view) -- creating character -- Initialize the scene here. -- Example: add display objects to "sceneGroup", add touch listeners, etc. end -- "scene:show()" function scene:show( event ) local sceneGroup = self.view local phase = event.phase if ( phase == "will" ) then -- Called when the scene is still off screen (but is about to come on screen). elseif ( phase == "did" ) then -- Called when the scene is now on screen. -- Insert code here to make the scene come alive. -- Example: start timers, begin animation, play audio, etc. end end -- "scene:hide()" function scene:hide( event ) local sceneGroup = self.view local phase = event.phase if ( phase == "will" ) then -- Called when the scene is on screen (but is about to go off screen). -- Insert code here to "pause" the scene. -- Example: stop timers, stop animation, stop audio, etc. elseif ( phase == "did" ) then -- Called immediately after scene goes off screen. end end -- "scene:destroy()" function scene:destroy( event ) local sceneGroup = self.view -- Called prior to the removal of scene's view ("sceneGroup"). -- Insert code here to clean up the scene. -- Example: remove display objects, save state, etc. end --------------------------------------------------------------------------------- -- Listener setup scene:addEventListener( "create", scene ) scene:addEventListener( "show", scene ) scene:addEventListener( "hide", scene ) scene:addEventListener( "destroy", scene ) scene:addEventListener("gameEnd", scene) -- this is my own one --------------------------------------------------------------------------------- return scene

The issue I was having was that my character module did not know about the “gameEnd” event…

But I think the issue might be I put the event handlder in the wrong place in the scene template…

I might need to put the Add the listener in the scene:create

I will try it out later today and let you know…

[RedBeach]

Composer is not supposed to work that way. You should create a new composer lua file (you can call it game-end.lua) and then call composer.gotoScene(“game-end”, params).

You can read more here:  http://docs.coronalabs.com/api/library/composer/index.html

[vik_b_it]

Renato,

if my gameEnd listener handler that’s exactly what I have…

But the issue I am having is how do I call the event?  The event should happen when the character object dies… when the character dies I want to dispatch the event, which in turn will call the event handler…

I hope that makes sense

[RedBeach]

I understand that you already have a function called gameEnd, is that right? So just call this function when the characters dies. You don’t have to add events.

[jonjonsson]

You can dispatch custom events if you want. See http://docs.coronalabs.com/daily/api/type/EventListener/dispatchEvent.html

So when your character dies you could perhaps do:

[lua]

scene:dispatchEvent( { name=“gameEnd”, target=characterGroup } )

[/lua]

Personally I would make a character module and do something like:

[lua]

– character.lua

local M = display.newGroup()

– Add your stuff to this group

local function died()

   M:dispatchEvent({name = “gameEnd”})

end

return M

[/lua]

[lua]

– Main gama lua file

local character = require(character)

character:addEventListener(“gameEnd”, someFunction) 

[/lua]

If you want to get really fancy: http://www.omidahourai.com/from-zero-to-oo-ardentkids-guide-to-object-oriented-lua-with-corona-sdk

[vik_b_it]

jonjonsson,

I am already using OO with the middleclass library… and yeah I already have a separate class for the character

I am using the composer for scene management

local composer = require( "composer" ) local scene = composer.newScene() --------------------------------------------------------------------------------- -- All code outside of the listener functions will only be executed ONCE -- unless "composer.removeScene()" is called. --------------------------------------------------------------------------------- -- local forward references should go here --------------------------------------------------------------------------------- -- "scene:create()" function scene:create( event ) local sceneGroup = self.view self.character = new character(self.view) -- creating character -- Initialize the scene here. -- Example: add display objects to "sceneGroup", add touch listeners, etc. end -- "scene:show()" function scene:show( event ) local sceneGroup = self.view local phase = event.phase if ( phase == "will" ) then -- Called when the scene is still off screen (but is about to come on screen). elseif ( phase == "did" ) then -- Called when the scene is now on screen. -- Insert code here to make the scene come alive. -- Example: start timers, begin animation, play audio, etc. end end -- "scene:hide()" function scene:hide( event ) local sceneGroup = self.view local phase = event.phase if ( phase == "will" ) then -- Called when the scene is on screen (but is about to go off screen). -- Insert code here to "pause" the scene. -- Example: stop timers, stop animation, stop audio, etc. elseif ( phase == "did" ) then -- Called immediately after scene goes off screen. end end -- "scene:destroy()" function scene:destroy( event ) local sceneGroup = self.view -- Called prior to the removal of scene's view ("sceneGroup"). -- Insert code here to clean up the scene. -- Example: remove display objects, save state, etc. end --------------------------------------------------------------------------------- -- Listener setup scene:addEventListener( "create", scene ) scene:addEventListener( "show", scene ) scene:addEventListener( "hide", scene ) scene:addEventListener( "destroy", scene ) scene:addEventListener("gameEnd", scene) -- this is my own one --------------------------------------------------------------------------------- return scene

The issue I was having was that my character module did not know about the “gameEnd” event…

But I think the issue might be I put the event handlder in the wrong place in the scene template…

I might need to put the Add the listener in the scene:create

I will try it out later today and let you know…