draw_learn_screen = function()
	edit.draw(Workbook, Text_color)
	if Playing_source and not Playing_source:isPlaying() then
		Playing_source = nil
	end
	if not Playing_source then
		App.color{r=0, g=0, b=0, a=0.5}
		love.graphics.polygon('fill', {30, 10, 45, 20, 30, 30})
	end
end