Refactored to use strictly locals

frontend/ui/widget/widget.lua

@@ -0,0 +1,50 @@
+local EventListener = require("ui/widget/eventlistener")
+
+--[[
+This is a generic Widget interface
+
+widgets can be queried about their size and can be paint.
+that's it for now. Probably we need something more elaborate
+later.
+
+if the table that was given to us as parameter has an "init"
+method, it will be called. use this to set _instance_ variables
+rather than class variables.
+--]]
+local Widget = EventListener:new()
+
+--[[
+Use this method to define a class that's inherited from current class.
+It only setup the metabale (or prototype chain) and will not initiatie
+a real instance, i.e. call self:init()
+--]]
+function Widget:extend(o)
+	local o = o or {}
+	setmetatable(o, self)
+	self.__index = self
+	return o
+end
+
+--[[
+Use this method to initiatie a instance of a class, don't use it for class
+definition.
+--]]
+function Widget:new(o)
+	o = self:extend(o)
+	-- Both o._init and o.init are called on object create. But o._init is used
+	-- for base widget initialization (basic component used to build other
+	-- widgets). While o.init is for higher level widgets, for example Menu
+	-- Widget
+	if o._init then o:_init() end
+	if o.init then o:init() end
+	return o
+end
+
+function Widget:getSize()
+	return self.dimen
+end
+
+function Widget:paintTo(bb, x, y)
+end
+
+return Widget