iOS: drag and drop using convertPointToView

app.js

var win = Ti.UI.createWindow({
	masterWindow: true,
	backgroundColor: 'white'
});

var view1 = Ti.UI.createView({
	top : 20,
	left : 20,
	height : 100,
	width : 100,
	backgroundColor : 'blue'
});
win.add(view1);

var view2 = Ti.UI.createView({
	top : 200,
	left : 50,
	height : 50,
	width : 100,
	backgroundColor : 'red'
});
win.add(view2);

longPress(view1, longPressCallback);
longPress(view2, longPressCallback);

var MVProps = {
	movable : true,
	opacity : 0
};
var movableView = Ti.UI.createView(MVProps);
win.add(movableView);

function longPress(element, callback) {
	var timer;
	element.addEventListener('touchstart', function(e) {
		timer = setTimeout(function() {
			if(callback) {
				callback(e);
			}
			Ti.API.info('long press');
		}, 500);
	});
	element.addEventListener('touchend', function() {
		clearTimeout(timer);
	});
};

function longPressCallback(e) {
	Ti.API.info("e: " + JSON.stringify(e));
	
	var cords = e.source.convertPointToView({x:e.x,y:e.y},win);
	Ti.API.info('globalCords: '+cords);
	
	MVProps.height = e.source.height+10;
	MVProps.width = e.source.width+10;
	
	var halfHeight = MVProps.halfHeight = Math.round(MVProps.height / 2);
	var halfWidth = MVProps.halfWidth = Math.round(MVProps.width / 2);
	
	MVProps.top = cords.y - halfHeight;
	MVProps.left = cords.x - halfWidth;
	
	movableView.animate({
		top:MVProps.top,
		left:MVProps.left,
		height:MVProps.height,
		width:MVProps.width,
		duration:0
		},function(){
		movableView.top = MVProps.top;
		movableView.left = MVProps.left;
		movableView.backgroundColor = e.source.backgroundColor;
		movableView.opacity = 1;
	});
};

win.addEventListener("touchmove", function(e) {
	// we check if movable is set to true so we don't grab the window
	if(movableView) {
		var halfHeight = MVProps.halfHeight;
		var halfWidth = MVProps.halfWidth;
		
		var cords = e.source.convertPointToView({x:e.x,y:e.y},win);
		movableView.left = cords.x - halfWidth;
		movableView.top = cords.y - halfHeight;
	}
});
win.addEventListener('touchend', function(e){
	if(e.source.masterWindow){
		movableView.animate({top:MVProps.top,left:MVProps.left,duration:500},function(){
			movableView.top = MVProps.top;
			movableView.left = MVProps.left;
			movableView.opacity = 0;
		});
	}
});

win.open();