/*
Script: Event.js
Contains the Event Native, to make the event object completely crossbrowser.

License:
MIT-style license.
*/

var Event = new Native({

name: 'Event',

initialize: function(event, win){
win = win || window;
var doc = win.document;
event = event || win.event;
if (event.$extended) return event;
this.$extended = true;
var type = event.type;
var target = event.target || event.srcElement;
while (target && target.nodeType == 3) target = target.parentNode;

if (type.test(/key/)){
var code = event.which || event.keyCode;
var key = Event.Keys.keyOf(code);
if (type == 'keydown'){
var fKey = code - 111;
if (fKey > 0 && fKey < 13) key = 'f' + fKey;
}
key = key || String.fromCharCode(code).toLowerCase();
} else if (type.match(/(click|mouse|menu)/i)){
doc = (!doc.compatMode || doc.compatMode == 'CSS1Compat') ? doc.html : doc.body;
var page = {
x: event.pageX || event.clientX + doc.scrollLeft,
y: event.pageY || event.clientY + doc.scrollTop
};
var client = {
x: (event.pageX) ? event.pageX - win.pageXOffset : event.clientX,
y: (event.pageY) ? event.pageY - win.pageYOffset : event.clientY
};
if (type.match(/DOMMouseScroll|mousewheel/)){
var wheel = (event.wheelDelta) ? event.wheelDelta / 120 : -(event.detail || 0) / 3;
}
var rightClick = (event.which == 3) || (event.button == 2);
var related = null;
if (type.match(/over|out/)){
switch (type){
case 'mouseover': related = event.relatedTarget || event.fromElement; break;
case 'mouseout': related = event.relatedTarget || event.toElement;
}
if (!(function(){
while (related && related.nodeType == 3) related = related.parentNode;
return true;
}).create({attempt: Browser.Engine.gecko})()) related = false;
}
}

return $extend(this, {
event: event,
type: type,

page: page,
client: client,
rightClick: rightClick,

wheel: wheel,

relatedTarget: related,
target: target,

code: code,
key: key,

shift: event.shiftKey,
control: event.ctrlKey,
alt: event.altKey,
meta: event.metaKey
});
}

});

Event.Keys = new Hash({
'enter': 13,
'up': 38,
'down': 40,
'left': 37,
'right': 39,
'esc': 27,
'space': 32,
'backspace': 8,
'tab': 9,
'delete': 46
});

Event.implement({

stop: function(){
return this.stopPropagation().preventDefault();
},

stopPropagation: function(){
if (this.event.stopPropagation) this.event.stopPropagation();
else this.event.cancelBubble = true;
return this;
},

preventDefault: function(){
if (this.event.preventDefault) this.event.preventDefault();
else this.event.returnValue = false;
return this;
}

});