Swype gestures for Windows 8

Swype gestures winJS

/*
*Add an event handler to an element to detect pointer down
*Ensure that is a touch event
*MSPointerDown and MSPointerUp are Windows 8/IE10 events. You should look at another code to handle gestures on other browsers
*/
this._element.addEventListener("MSPointerDown", function (e) {
	//Touch event
	if (e.pointerType == 2) {
		context._gestureInfos = new Object();
		context._gestureInfos.started = true;
		context._gestureInfos.position = new Object();
		context._gestureInfos.position.x = e.x;
		context._gestureInfos.position.y = e.y;
		context._gestureInfos.startTime = Math.round(new Date().getTime() / 1000); //Unix Timestamp
	}
});

/*
*Add event handler to detect finger up on the element, and maybe raise the gesture event
*/
this._element.addEventListener("MSPointerUp", function (e) {
	if (e.pointerType == 2 && context._gestureInfos
		&& context._gestureInfos.started) {

		var ts = Math.round(new Date().getTime() / 1000);
		if (Math.abs(e.y - context._gestureInfos.position.y) < 50
			&& ts - context._gestureInfos.startTime <= 1 &&
			Math.abs(e.x - context._gestureInfos.position.x) > window.screen.availWidth * 0.4) {
			//Gesture done !
			if (e.x > context._gestureInfos.position.x)
				swypeRight();
			else
				swypeLeft();
		}

		context._gestureInfos.started = false;
	}
});