module Context

	# This is the abstract view class
	class View
		attr_reader :context
		def initialize(context)
			@context = context
		end
		
		def addView(view)
			myWidget = getWidget()
			if(myWidget != nil)
				newWidget = view.getWidget()
				if !newWidget.nil?
    				myWidget.add(newWidget)
    				newWidget.addedTo(myWidget)
    		    end
			end
		end

        def removeView(view)
            myWidget = getWidget()
            if(myWidget != nil)
                oldWidget = view.getWidget()
                if !oldWidget.nil?
                    myWidget.remove(oldWidget)
                    oldWidget.removedFrom(myWidget)
                end
            end
        end
		
		# Concrete classes should override this method
		def open
		end
		
		# Concrete classes should override this method
		def close
		end

		# Concrete classes should override this method
		def getWidget
			return nil
		end

		def notifyKey(widget, key)
			@context.notifyKey(self, key)
		end
	end
end