scene4.lua

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--
-- testscreen4.lua
--
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local storyboard = require( "storyboard" )
local scene = storyboard.newScene()

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-- BEGINNING OF YOUR IMPLEMENTATION
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local image, text1, text2, text3

local function onSceneTouch( self, event )
	if event.phase == "began" then
		
		storyboard.gotoScene( "scene1", "fromBottom", 800  )
		
		return true
	end
end


-- Called when the scene's view does not exist:
function scene:createScene( event )
	local screenGroup = self.view
	
	image = display.newImage( "bg2.jpg" )
	screenGroup:insert( image )
	
	image.touch = onSceneTouch
	
	text1 = display.newText( "Scene 4", 0, 0, native.systemFontBold, 24 )
	text1:setTextColor( 255 )
	text1:setReferencePoint( display.CenterReferencePoint )
	text1.x, text1.y = display.contentWidth * 0.5, 50
	screenGroup:insert( text1 )
	
	text2 = display.newText( "MemUsage: ", 0, 0, native.systemFont, 16 )
	text2:setTextColor( 255 )
	text2:setReferencePoint( display.CenterReferencePoint )
	text2.x, text2.y = display.contentWidth * 0.5, display.contentHeight * 0.5
	screenGroup:insert( text2 )
	
	text3 = display.newText( "Touch to continue.", 0, 0, native.systemFontBold, 18 )
	text3:setTextColor( 255 ); text3.isVisible = false
	text3:setReferencePoint( display.CenterReferencePoint )
	text3.x, text3.y = display.contentWidth * 0.5, display.contentHeight - 100
	screenGroup:insert( text3 )
	
	print( "\n4: createScene event" )
end


-- Called immediately after scene has moved onscreen:
function scene:enterScene( event )
	
	print( "4: enterScene event" )
	
	-- remove previous scene's view
	storyboard.purgeScene( "scene3" )
	
	-- update Lua memory text display
	local showMem = function()
		image:addEventListener( "touch", image )
		text3.isVisible = true
		text2.text = text2.text .. collectgarbage("count")/1000 .. "MB"
		text2.x = display.contentWidth * 0.5
	end
	local memTimer = timer.performWithDelay( 1000, showMem, 1 )
end


-- Called when scene is about to move offscreen:
function scene:exitScene()
	
	print( "4: exitScene event\n" )
	
	-- remove touch listener for image
	image:removeEventListener( "touch", image )
	
	-- reset label text
	text2.text = "MemUsage: "
end


-- Called prior to the removal of scene's "view" (display group)
function scene:destroyScene( event )
	
	print( "((destroying scene 4's view))" )
end

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-- END OF YOUR IMPLEMENTATION
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-- "createScene" event is dispatched if scene's view does not exist
scene:addEventListener( "createScene", scene )

-- "enterScene" event is dispatched whenever scene transition has finished
scene:addEventListener( "enterScene", scene )

-- "exitScene" event is dispatched before next scene's transition begins
scene:addEventListener( "exitScene", scene )

-- "destroyScene" event is dispatched before view is unloaded, which can be
-- automatically unloaded in low memory situations, or explicitly via a call to
-- storyboard.purgeScene() or storyboard.removeScene().
scene:addEventListener( "destroyScene", scene )

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return scene