Rails spinoffs - Oct 2007 - Getting mouse position from a timed function - My Solution

EDIT: I originally wrote this as a response to this thread (http://
groups.google.com/group/rubyonrails-spinoffs/browse_thread/thread/
a735c534f89fc5cf/8d8546811cae5ee8), but it wouldn''t let me respond
that that thread (presumably because of it''s age). Rather than just
throw it away, I figured I''d post it here in case in can help anyone
else.

I built a little class to help me do just that. Here is my
implementation: (using Prototype 1.6)

var pointerTracker = Class.create({
	initialize: function(){
		this.x = null;
		this.y = null;
		this.bodyEl = $(document.body);

		//Bind event listener.
		this.boundUpdatePosition this.updatePosition.bindAsEventListener(this);

		this.start();
	},
	updatePosition: function(event){
		this.x = event.pointerX();
		this.y = event.pointerY();
	},
	start: function(){
		this.bodyEl.observe(''mousemove'', this.boundUpdatePosition);
	},
	stop: function(){
		this.bodyEl.stopObserving(''mousemove'',
this.boundUpdatePosition);
	},
	within: function(element){
		//is the cursor within the given element? Return bool
		var el = $(element);
		var vpo = el.viewportOffset();
		return (this.x > vpo[0] &&
				this.x < vpo[0] + el.getWidth() &&
				this.y > vpo[1] &&
				this.y < vpo[1] + el.getHeight());
	}
});


Once you have that included in your page, you can use it like this...

//Start capturing mouse position.
var pointer = new pointerTracker();

//Close the toolbar if the mouse is not hovering over it. Check ever 3
seconds.
new PeriodicalExecuter(function(pe){
	if (!pointer.within(''tool-bar'')){
		pe.stop();
		pointer.stop();

		$(''tool-bar'').hide(); //Close the toolbar!
	}
}, 3);


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