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    Not able to use Button.new

    simransimran Member
    edited June 2014 in Code snippets
    Hello,

    I was following Gideros mobile app development bu arturs sosins. The code in it use Button.new(text), I am trying to do exactly similar thing but it gives an error, attempt to index global Button(a nil value)

    local startButton = Button.new(startText)
    startButton:setPosition(conf.dx - conf.width/3, conf.dy - conf.height/4 )
    self:addChild(startButton)
    startButton:addEventListener("click", function()
    print("Started")
    end)

    Please help me fix this
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    Comments

    • yubaroyubaro Member
      edited June 2014
      Hi @simran, try:
                      screenW = application:getContentWidth()
		screenH = application:getContentHeight()
		local buttonUp = Bitmap.new(Texture.new("image.png"), true)
		local buttonDown = Bitmap.new(Texture.new("image.png"), true)
		buttonUp:setAnchorPoint(0.5, 0.5)	
		buttonDown:setAnchorPoint(0.5, 0.5)	
		buttonDown:setAlpha(0.5)
		local button = Button.new(buttonUp, buttonDown)
		button:setPosition(screenW * 0.5,screenH * 0.5)
		self:addChild(button) 
		button:addEventListener("click", 
			function()
				print("Started button")
			end
		)
      You must have "button.lua" in your files.
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    • simransimran Member
      Thank you for your reply, but I essentially wanted to pass the text and not image. The example is exactly that way in book, I am surprised how could it possibly not work?
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    • ar2rsawseenar2rsawseen Maintainer
      Hello @simran ;)
      you need to include the Button class:
      https://github.com/gideros/Button
      http://appcodingeasy.com/Gideros-Mobile
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    • yubaroyubaro Member
      edited June 2014
      You must have "button.lua" in your files.
      Try:
                     --font = Font.new("font.txt", "font.png", true)
 
                screenW = application:getContentWidth()
		screenH = application:getContentHeight()
		local buttonUp = TextField.new(nil, "TEXT UP", true)  -- nil or font 
		local buttonDown = TextField.new(nil, "TEXT DOWN", true)
		--buttonUp:setAnchorPoint(0.5, 0.5)	-- with gideroscodingeasy
		--buttonDown:setAnchorPoint(0.5, 0.5) -- with gideroscodingeasy	
		buttonDown:setAlpha(0.5)
		local button = Button.new(buttonUp, buttonDown)
		button:setPosition(screenW * 0.5,screenH * 0.5)
		self:addChild(button) 
		button:addEventListener("click", 
			function()
				print("Started button")
			end
		)
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    • simransimran Member
      @ar2rsawseen: Yes, I included Button.lua but it necessarily asks for two parameters to be passed to Button.new() but in your book, the example that you have given takes only the text , Would not that work?
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    • simransimran Member
      This is the piece of code from book only
      local startText = TextField.new(conf.fontLarge, "Start Game") startText:setTextColor(0xffff00) local startButton = Button.new(startText) startButton:setPosition(conf.width/2, conf.height - 80)
      self:addChild(startButton)
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    • ar2rsawseenar2rsawseen Maintainer
      Accepted Answer
      @simran oh in my book
      there you create your own Button class which accepts only text, yes
      http://appcodingeasy.com/Gideros-Mobile
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    • simransimran Member
      @ar2rswseen: Oh, yes! Silly me . Thanks a ton :) Would like to say it's an awesome book and looking forward to more from you. Thanks :) :D
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