menu.rb

class Menu
	class MenuItem
		HOVER_OFFSET = 3
		def initialize (window, image, x, y, z, callback, hover_image = nil)
			@window = window
			@main_image = image
			@hover_image = hover_image
			@original_x = @x = x
			@original_y = @y = y
			@z = z
			@callback = callback
			@active_image = @main_image
		end

		def draw
			@active_image.draw(@x, @y, @z)
		end

		def update
			if is_mouse_hovering then
				if !@hover_image.nil? then
					@active_image = @hover_image
				end

				@x = @original_x + HOVER_OFFSET
				@y = @original_y + HOVER_OFFSET
			else 
				@active_image = @main_image
				@x = @original_x
				@y = @original_y
			end
		end

		def is_mouse_hovering
			mx = @window.mouse_x
			my = @window.mouse_y

			(mx >= @x and my >= @y) and (mx <= @x + @active_image.width) and (my <= @y + @active_image.height)
		end

		def clicked
			if is_mouse_hovering then
				@callback.call
			end
		end
	end

	def initialize (window)
		@window = window
		@items = Array.new
	end

	def add_item (image, x, y, z, callback, hover_image = nil)
		item = MenuItem.new(@window, image, x, y, z, callback, hover_image)
		@items << item
		self
	end

	def draw
		@items.each do |i|
			i.draw
		end
	end

	def update
		@items.each do |i|
			i.update
		end
	end

	def clicked
		@items.each do |i|
			i.clicked
		end
	end
end