"use strict"

var throttle = require("../api/throttle")

module.exports = function(root, renderer, pubsub, callback) {
	var run = throttle(callback)
	renderer.setEventCallback(function(e) {
		if (e.redraw !== false) run()
	})
	
	if (pubsub != null) {
		if (root.redraw) pubsub.unsubscribe(root.redraw)
		pubsub.subscribe(run)
	}
	
	return root.redraw = run
}