michael@0: /**
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/
michael@0:  */
michael@0: var gTimeoutId;
michael@0: var gTimeoutCount = 0;
michael@0: var gIntervalCount = 0;
michael@0: 
michael@0: function timeoutFunc() {
michael@0:   if (++gTimeoutCount > 1) {
michael@0:     throw new Error("Timeout called more than once!");
michael@0:   }
michael@0:   postMessage("timeoutFinished");
michael@0: }
michael@0: 
michael@0: function intervalFunc() {
michael@0:   if (++gIntervalCount == 2) {
michael@0:     postMessage("intervalFinished");
michael@0:   }
michael@0: }
michael@0: 
michael@0: function messageListener(event) {
michael@0:   switch (event.data) {
michael@0:     case "startTimeout":
michael@0:       gTimeoutId = setTimeout(timeoutFunc, 2000);
michael@0:       clearTimeout(gTimeoutId);
michael@0:       gTimeoutId = setTimeout(timeoutFunc, 2000);
michael@0:       break;
michael@0:     case "startInterval":
michael@0:       gTimeoutId = setInterval(intervalFunc, 2000);
michael@0:       break;
michael@0:     case "cancelInterval":
michael@0:       clearInterval(gTimeoutId);
michael@0:       postMessage("intervalCanceled");
michael@0:       break;
michael@0:     case "startExpression":
michael@0:       setTimeout("this.postMessage('expressionFinished');", 2000);
michael@0:       break;
michael@0:     default:
michael@0:       throw "Bad message: " + event.data;
michael@0:   }
michael@0: }
michael@0: 
michael@0: addEventListener("message", messageListener, false);