event-facade-dom.js revision 0771d781138a507b3e657573703f511291640bf3
(function() {
/**
* Custom event engine, DOM event listener abstraction layer, synthetic DOM
* events.
* @module event
* @submodule event-base
*/
/**
* Wraps a DOM event, properties requiring browser abstraction are
* fixed here. Provids a security layer when required.
* @class DOMEventFacade
* @param ev {Event} the DOM event
* @param currentTarget {HTMLElement} the element the listener was attached to
* @param wrapper {Event.Custom} the custom event wrapper for this DOM event
*/
/*
* @TODO constants? LEFTBUTTON, MIDDLEBUTTON, RIGHTBUTTON, keys
*/
/*
var whitelist = {
altKey : 1,
// "button" : 1, // we supply
// "bubbles" : 1, // needed?
// "cancelable" : 1, // needed?
// "charCode" : 1, // we supply
cancelBubble : 1,
// "currentTarget" : 1, // we supply
ctrlKey : 1,
clientX : 1, // needed?
clientY : 1, // needed?
detail : 1, // not fully implemented
// "fromElement" : 1,
keyCode : 1,
// "height" : 1, // needed?
// "initEvent" : 1, // need the init events?
// "initMouseEvent" : 1,
// "initUIEvent" : 1,
// "layerX" : 1, // needed?
// "layerY" : 1, // needed?
metaKey : 1,
// "modifiers" : 1, // needed?
// "offsetX" : 1, // needed?
// "offsetY" : 1, // needed?
// "preventDefault" : 1, // we supply
// "reason" : 1, // IE proprietary
// "relatedTarget" : 1,
// "returnValue" : 1, // needed?
shiftKey : 1,
// "srcUrn" : 1, // IE proprietary
// "srcElement" : 1,
// "srcFilter" : 1, IE proprietary
// "stopPropagation" : 1, // we supply
// "target" : 1,
// "timeStamp" : 1, // needed?
// "toElement" : 1,
type : 1,
// "view" : 1,
// "which" : 1, // we supply
// "width" : 1, // needed?
x : 1,
y : 1
},
*/
var ua = Y.UA,
/**
* webkit key remapping required for Safari < 3.1
* @property webkitKeymap
* @private
*/
webkitKeymap = {
63232: 38, // up
63233: 40, // down
63234: 37, // left
63235: 39, // right
63276: 33, // page up
63277: 34, // page down
25: 9, // SHIFT-TAB (Safari provides a different key code in
// this case, even though the shiftKey modifier is set)
63272: 46, // delete
63273: 36, // home
63275: 35 // end
},
/**
* Returns a wrapped node. Intended to be used on event targets,
* so it will return the node's parent if the target is a text
* node
* @method resolve
* @private
*/
resolve = function(n) {
if (!n) {
return null;
}
try {
if (ua.webkit && 3 == n.nodeType) {
n = n.parentNode;
}
} catch(ex) { }
return Y.Node.get(n);
};
// provide a single event with browser abstractions resolved
//
// include all properties for both browers?
// include only DOM2 spec properties?
// provide browser-specific facade?
Y.DOMEventFacade = function(ev, currentTarget, wrapper) {
wrapper = wrapper || {};
var e = ev, ot = currentTarget, d = Y.config.doc, b = d.body,
x = e.pageX, y = e.pageY, c, t;
this.altKey = e.altKey;
this.ctrlKey = e.ctrlKey;
this.metaKey = e.metaKey;
this.shiftKey = e.shiftKey;
this.type = e.type;
this.clientX = e.clientX;
this.clientY = e.clientY;
//////////////////////////////////////////////////////
if (!x && 0 !== x) {
x = e.clientX || 0;
y = e.clientY || 0;
if (ua.ie) {
x += Math.max(d.documentElement.scrollLeft, b.scrollLeft);
y += Math.max(d.documentElement.scrollTop, b.scrollTop);
}
}
this._yuifacade = true;
/**
* The X location of the event on the page (including scroll)
* @property pageX
* @type int
*/
this.pageX = x;
/**
* The Y location of the event on the page (including scroll)
* @property pageY
* @type int
*/
this.pageY = y;
//////////////////////////////////////////////////////
c = e.keyCode || e.charCode || 0;
if (ua.webkit && (c in webkitKeymap)) {
c = webkitKeymap[c];
}
/**
* The keyCode for key events. Uses charCode if keyCode is not available
* @property keyCode
* @type int
*/
this.keyCode = c;
/**
* The charCode for key events. Same as keyCode
* @property charCode
* @type int
*/
this.charCode = c;
//////////////////////////////////////////////////////
/**
* The button that was pushed.
* @property button
* @type int
*/
this.button = e.which || e.button;
/**
* The button that was pushed. Same as button.
* @property which
* @type int
*/
this.which = this.button;
//////////////////////////////////////////////////////
/**
* Node reference for the targeted element
* @propery target
* @type Node
*/
this.target = resolve(e.target || e.srcElement);
/**
* Node reference for the element that the listener was attached to.
* @propery currentTarget
* @type Node
*/
this.currentTarget = resolve(ot);
t = e.relatedTarget;
if (!t) {
if (e.type == "mouseout") {
t = e.toElement;
} else if (e.type == "mouseover") {
t = e.fromElement;
}
}
/**
* Node reference to the relatedTarget
* @propery relatedTarget
* @type Node
*/
this.relatedTarget = resolve(t);
/**
* Number representing the direction and velocity of the movement of the mousewheel.
* Negative is down, the higher the number, the faster. Applies to the mousewheel event.
* @property wheelDelta
* @type int
*/
if (e.type == "mousewheel" || e.type == "DOMMouseScroll") {
this.wheelDelta = (e.detail) ? (e.detail * -1) : Math.round(e.wheelDelta / 80) || ((e.wheelDelta < 0) ? -1 : 1);
}
//////////////////////////////////////////////////////
// methods
/**
* Stops the propagation to the next bubble target
* @method stopPropagation
*/
this.stopPropagation = function() {
if (e.stopPropagation) {
e.stopPropagation();
} else {
e.cancelBubble = true;
}
wrapper.stopped = 1;
};
/**
* Stops the propagation to the next bubble target and
* prevents any additional listeners from being exectued
* on the current target.
* @method stopImmediatePropagation
*/
this.stopImmediatePropagation = function() {
if (e.stopImmediatePropagation) {
e.stopImmediatePropagation();
} else {
this.stopPropagation();
}
wrapper.stopped = 2;
};
/**
* Prevents the event's default behavior
* @method preventDefault
* @param returnValue {string} sets the returnValue of the event to this value
* (rather than the default false value). This can be used to add a customized
* confirmation query to the beforeunload event).
*/
this.preventDefault = function(returnValue) {
if (e.preventDefault) {
e.preventDefault();
}
e.returnValue = returnValue || false;
wrapper.prevented = 1;
};
/**
* Stops the event propagation and prevents the default
* event behavior.
* @method halt
* @param immediate {boolean} if true additional listeners
* on the current target will not be executed
*/
this.halt = function(immediate) {
if (immediate) {
this.stopImmediatePropagation();
} else {
this.stopPropagation();
}
this.preventDefault();
};
};
})();