/**
 * @class Ext.CompositeElementLite
 * Flyweight composite class. Reuses the same Ext.Element for element operations.
 

 var els = Ext.select("#some-el div.some-class");
 // or select directly from an existing element
 var el = Ext.get('some-el');
 el.select('div.some-class');

 els.setWidth(100); // all elements become 100 width
 els.hide(true); // all elements fade out and hide
 // or
 els.setWidth(100).hide(true);
 



 * NOTE: Although they are not listed, this class supports all of the set/update methods of Ext.Element. All Ext.Element
 * actions will be performed on all the elements in this collection.
 */
Ext.CompositeElementLite = function(els, root){
    this.elements = [];
    this.add(els, root);
    this.el = new Ext.Element.Flyweight();
};

Ext.CompositeElementLite.prototype = {
	isComposite: true,	
	
/**
     * Returns the number of elements in this composite
     * @return Number
     */
    getCount : function(){
        return this.elements.length;
    },    
	add : function(els){
        if(els){
            if (Ext.isArray(els)) {
                this.elements = this.elements.concat(els);
            } else {
                var yels = this.elements;                	                
	            Ext.each(els, function(e) {
                    yels.push(e);
                });
            }
        }
        return this;
    },
    invoke : function(fn, args){
        var els = this.elements,
        	el = this.el;        
	    Ext.each(els, function(e) {    
            el.dom = e;
        	Ext.Element.prototype[fn].apply(el, args);
        });
        return this;
    },
    
/**
     * Returns a flyweight Element of the dom element object at the specified index
     * @param {Number} index
     * @return {Ext.Element}
     */
    item : function(index){
	    var me = this;
        if(!me.elements[index]){
            return null;
        }
        me.el.dom = me.elements[index];
        return me.el;
    },

    // fixes scope with flyweight
    addListener : function(eventName, handler, scope, opt){
        Ext.each(this.elements, function(e) {
	        Ext.EventManager.on(e, eventName, handler, scope || e, opt);
        });
        return this;
    },
    
/**
    * Calls the passed function passing (el, this, index) for each element in this composite. The element
    * passed is the flyweight (shared) Ext.Element instance, so if you require a
    * a reference to the dom node, use el.dom.
    * @param {Function} fn The function to call
    * @param {Object} scope (optional) The this object (defaults to the element)
    * @return {CompositeElement} this
    */
    each : function(fn, scope){       
        var me = this,
        	el = me.el;
       
	    Ext.each(me.elements, function(e,i) {    
            el.dom = e;
        	return fn.call(scope || el, el, me, i);
        });
        return me;
    },
    
    
/**
     * Find the index of the passed element within the composite collection.
     * @param el {Mixed} The id of an element, or an Ext.Element, or an HtmlElement to find within the composite collection.
     * @return Number The index of the passed Ext.Element in the composite collection, or -1 if not found.
     */
    indexOf : function(el){
        return this.elements.indexOf(Ext.getDom(el));
    },
    
    
/**
    * Replaces the specified element with the passed element.
    * @param {Mixed} el The id of an element, the Element itself, the index of the element in this composite
    * to replace.
    * @param {Mixed} replacement The id of an element or the Element itself.
    * @param {Boolean} domReplace (Optional) True to remove and replace the element in the document too.
    * @return {CompositeElement} this
    */    
    replaceElement : function(el, replacement, domReplace){
        var index = !isNaN(el) ? el : this.indexOf(el),
        	d;
        if(index > -1){
            replacement = Ext.getDom(replacement);
            if(domReplace){
                d = this.elements[index];
                d.parentNode.insertBefore(replacement, d);
                Ext.removeNode(d);
            }
            this.elements.splice(index, 1, replacement);
        }
        return this;
    },
    
    
/**
     * Removes all elements.
     */
    clear : function(){
        this.elements = [];
    }
};

Ext.CompositeElementLite.prototype.on = Ext.CompositeElementLite.prototype.addListener;

(function(){
var fnName,
	ElProto = Ext.Element.prototype,
	CelProto = Ext.CompositeElementLite.prototype;
	
for(fnName in ElProto){
    if(Ext.isFunction(ElProto[fnName])){
	    (function(fnName){ 
		    CelProto[fnName] = CelProto[fnName] || function(){
		    	return this.invoke(fnName, arguments);
	    	};
    	}).call(CelProto, fnName);
        
    }
}
})();

if(Ext.DomQuery){
    Ext.Element.selectorFunction = Ext.DomQuery.select;
} 

/**
 * Selects elements based on the passed CSS selector to enable {@link Ext.Element Element} methods
 * to be applied to many related elements in one statement through the returned {@link Ext.CompositeElement CompositeElement} or
 * {@link Ext.CompositeElementLite CompositeElementLite} object.
 * @param {String/Array} selector The CSS selector or an array of elements
 * @param {Boolean} unique (optional) true to create a unique Ext.Element for each element (defaults to a shared flyweight object) Not supported in core
 * @param {HTMLElement/String} root (optional) The root element of the query or id of the root
 * @return {CompositeElementLite/CompositeElement}
 * @member Ext.Element
 * @method select
 */
Ext.Element.select = function(selector, unique, root){
    var els;
    if(typeof selector == "string"){
        els = Ext.Element.selectorFunction(selector, root);
    }else if(selector.length !== undefined){
        els = selector;
    }else{
        throw "Invalid selector";
    }
    return new Ext.CompositeElementLite(els);
};
/**
 * Selects elements based on the passed CSS selector to enable {@link Ext.Element Element} methods
 * to be applied to many related elements in one statement through the returned {@link Ext.CompositeElement CompositeElement} or
 * {@link Ext.CompositeElementLite CompositeElementLite} object.
 * @param {String/Array} selector The CSS selector or an array of elements
 * @param {Boolean} unique (optional) true to create a unique Ext.Element for each element (defaults to a shared flyweight object)
 * @param {HTMLElement/String} root (optional) The root element of the query or id of the root
 * @return {CompositeElementLite/CompositeElement}
 * @member Ext
 * @method select
 */
Ext.select = Ext.Element.select;