bg.lua

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local bg = {}

local isInitialized = false

function bg:init()
	utils:log('Initializing bg')

	bg.top = utils:createImage(layout.bg.imgTopPath)
	bg.mid = utils:createImage(layout.bg.imgMidPath, false) -- allow the mid section to stretch
	bg.bottom = utils:createImage(layout.bg.imgBottomPath)
	
	bg.contentHeight = 0
	bg.size = {}
	bg.size.width = 0
	bg.size.height = 0
	bg.posX = 0
	bg.posY = 0
	
	isInitialized = true
end

function bg:dispose()
	utils:log('Disposing bg')
	isInitialized = false

	images.destroy(self.top)
	images.destroy(self.mid)
	images.destroy(self.bottom)
end

function bg:pos(x, y)
	self.posX = x
	self.posY = y

	self.top:pos(x, y)
	self.mid:pos(x, y + layout.bg.imgTopBottomHeight)
	self.bottom:pos(x, y + layout.bg.imgTopBottomHeight + self.contentHeight)
end

function bg:resize(rowCount)
	utils:log('BG setting row count: ' .. rowCount)

	-- height of the content area (excludes top and bottom tiles)
	self.contentHeight = rowCount * settings.rowSpacingY
	
	self.mid:size(layout.bg.imgWidth, self.contentHeight)
	self:pos(self.posX, self.posY) -- refresh position of bottom tile
	
	-- visible size of the whole background area
	self.size.width = layout.bg.imgWidth
	self.size.height = layout.bg.imgTopBottomHeight * 2 + self.contentHeight
end

function bg:hide()
	if not isInitialized then return end

	self.top:hide()
	self.mid:hide()
	self.bottom:hide()
end

function bg:show()
	if not isInitialized then return end
	
	self.top:show()
	self.mid:show()
	self.bottom:show()
end

return bg