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    Metatables

    hoanhoan Member
    edited April 2012 in General questions
    Hey everyone

    I'm trying to write a corona compatibility layer for certain functions like: display.*, system.* etc

    So I can add methods to a Sprite object so:

    object:setFillColor is translated into object:setColorTransform

    However, I've never used metatables before, and want these to be translated:

    object.x => object:getX()
    object.y => object:getY()

    I call this on an object to add extra methods
    function __addDisplayMethods(object)
	local mt = getmetatable(object)
	local oldIndex = mt.__index
 
	object.setFillColor = function(self,r,g,b,a)
		object:setColorTransform(r/255,g/255,b/255,a/255)
	end
 
	object.insert = function(self,thing)
		object:addChild(thing)
	end
 
	object.__index = function(self,key)
		print("I")
	end
 
	mt.__index = function(t, key)
		print("Ky = " .. key)
		if key == 'x' then
			return object:getX()
		else
			oldIndex(t, key)
		end
	end
end
    However old gideros methods don't work any longer. object:setPosition() fails. Is there a way to chain these metatables or not?

    Thanks
    Hoan

    Likes: Ozzan

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    Comments

    • evsevs Member
      edited April 2012
      As an aside - If you want to format your code without the nasty yellow
      make sure that inside your opening <> you have pre lang="lua" exactly like that.
      Then in the closing <> you have /pre - no spaces around any of it!
       
if not yellow then print("Hallelujah!") end
      cheers

      evs
      +1 -1Share on Facebook
    • hoanhoan Member
      Hey I figured it out. Anyone else working on corona compatibility layer? Lets pool efforts
      +1 -1Share on Facebook
    • gorkemgorkem Maintainer
      @ozapps has been working on it
      +1 -1Share on Facebook
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