17223554 : xquared upgrade to 0.7

git-svn-id: http://xe-core.googlecode.com/svn/sandbox@4968 201d5d3c-b55e-5fd7-737f-ddc643e51545

modules/editor/skins/xquared/javascripts/Timer.js

@@ -0,0 +1,90 @@
+/**
+ * @requires Xquared.js
+ */
+xq.Timer = xq.Class(/** @lends xq.Timer.prototype */{
+	/**
+     * @constructs
+     * 
+     * @param {Number} precision precision in milliseconds
+	 */
+	initialize: function(precision) {
+		xq.addToFinalizeQueue(this);
+	
+		this.precision = precision;
+		this.jobs = {};
+		this.nextJobId = 0;
+		
+		this.checker = null;
+	},
+	
+	finalize: function() {
+		this.stop();
+	},
+	
+	/**
+	 * starts timer
+	 */
+	start: function() {
+		this.stop();
+		
+		this.checker = window.setInterval(function() {
+			this.executeJobs();
+		}.bind(this), this.precision);
+	},
+	
+	/**
+	 * stops timer
+	 */
+	stop: function() {
+		if(this.checker) window.clearInterval(this.checker);
+	},
+	
+	/**
+	 * registers new job
+	 * 
+	 * @param {Function} job function to execute
+	 * @param {Number} interval interval in milliseconds
+	 * 
+	 * @return {Number} job id
+	 */
+	register: function(job, interval) {
+		var jobId = this.nextJobId++;
+		
+		this.jobs[jobId] = {
+			func:job,
+			interval: interval,
+			lastExecution: Date.get()
+		};
+		
+		return jobId;
+	},
+	
+	/**
+	 * unregister job by job id
+	 * 
+	 * @param {Number} job id
+	 */
+	unregister: function(jobId) {
+		delete this.jobs[jobId];
+	},
+	
+	/**
+	 * Execute all expired jobs immedialty. This method will be called automatically by interval timer.
+	 */
+	executeJobs: function() {
+		var curDate = new Date();
+		
+		for(var id in this.jobs) {
+			var job = this.jobs[id];
+			if(job.lastExecution.elapsed(job.interval, curDate)) {
+				try {
+					job.lastReturn = job.func();
+				} catch(e) {
+					job.lastException = e;
+				} finally {
+					job.lastExecution = curDate;
+				}
+			}
+		}
+	}
+});