CompositeElement.js

/**
 * @class Ext.CompositeElement
 * Standard composite class. Creates a Ext.Element for every element in the collection.
 * <br><br>
 * <b>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.</b>
 * <br><br>
 * All methods return <i>this</i> and can be chained.
 <pre><code>
 var els = getEls("#some-el div.some-class");
 // or
 var els = Ext.Element.select("#some-el 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);
 </code></pre>
 */
Ext.CompositeElement = function(els){
    this.elements = [];
    this.addElements(els);
};
Ext.CompositeElement.prototype = {
    isComposite: true,
    addElements : function(els){
        if(!els) return this;
        if(typeof els == "string"){
            els = Ext.Element.selectorFunction(els);
        }
        var yels = this.elements;
        var index = yels.length-1;
        for(var i = 0, len = els.length; i < len; i++) {
        	yels[++index] = Ext.get(els[i], true);
        }
        return this;
    },
    invoke : function(fn, args){
        var els = this.elements;
        for(var i = 0, len = els.length; i < len; i++) {
        	Ext.Element.prototype[fn].apply(els[i], args);
        }
        return this;
    },
    /**
    * Adds elements to this composite.
    * @param {String/Array} els A string CSS selector, an array of elements or an element
    * @return {CompositeElement} this
    */
    add : function(els){
        if(typeof els == "string"){
            this.addElements(Ext.Element.selectorFunction(els));
        }else if(els.length !== undefined){
            this.addElements(els);
        }else{
            this.addElements([els]);
        }
        return this;
    },
    /**
    * Calls the passed function passing (el, this, index) for each element in this composite.
    * @param {Function} fn The function to call
    * @param {Object} scope （可选） The <i>this</i> object (defaults to the element)
    * @return {CompositeElement} this
    */
    each : function(fn, scope){
        var els = this.elements;
        for(var i = 0, len = els.length; i < len; i++){
            if(fn.call(scope || els[i], els[i], this, i) === false) {
                break;
            }
        }
        return this;
    },

    /**
     * Returns the Element object at the specified index
     * @param {Number} index
     * @return {Ext.Element}
     */
    item : function(index){
        return this.elements[index];
    }
};
(function(){
Ext.CompositeElement.createCall = function(proto, fnName){
    if(!proto[fnName]){
        proto[fnName] = function(){
            return this.invoke(fnName, arguments);
        };
    }
};
for(var fnName in Ext.Element.prototype){
    if(typeof Ext.Element.prototype[fnName] == "function"){
        Ext.CompositeElement.createCall(Ext.CompositeElement.prototype, fnName);
    }
};
})();

/**
 * @class Ext.CompositeElementLite
 * @extends Ext.CompositeElement
 * Flyweight composite class. Reuses the same Ext.Element for element operations.
 * <br><br>
 * <b>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.</b>
 */
Ext.CompositeElementLite = function(els){
    Ext.CompositeElementLite.superclass.constructor.call(this, els);
    var flyEl = function(){};
    flyEl.prototype = Ext.Element.prototype;
    this.el = new Ext.Element.Flyweight();
};
Ext.extend(Ext.CompositeElementLite, Ext.CompositeElement, {
    addElements : function(els){
        if(els){
            if(els instanceof Array){
                this.elements = this.elements.concat(els);
            }else{
                var yels = this.elements;
                var index = yels.length-1;
                for(var i = 0, len = els.length; i < len; i++) {
                    yels[++index] = els[i];
                }
            }
        }
        return this;
    },
    invoke : function(fn, args){
        var els = this.elements;
        var el = this.el;
        for(var i = 0, len = els.length; i < len; i++) {
            el.dom = els[i];
        	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){
        this.el.dom = this.elements[index];
        return this.el;
    },

    // fixes scope with flyweight
    addListener : function(eventName, handler, scope, opt){
        var els = this.elements;
        for(var i = 0, len = els.length; i < len; i++) {
            Ext.EventManager.on(els[i], eventName, handler, scope || els[i], opt);
        }
        return this;
    },

    /**
    * Calls the passed function passing (el, this, index) for each element in this composite. <b>The element
    * passed is the flyweight (shared) Ext.Element instance, so if you require a
    * a reference to the dom node, use el.dom.</b>
    * @param {Function} fn The function to call
    * @param {Object} scope （可选） The <i>this</i> object (defaults to the element)
    * @return {CompositeElement} this
    */
    each : function(fn, scope){
        var els = this.elements;
        var el = this.el;
        for(var i = 0, len = els.length; i < len; i++){
            el.dom = els[i];
        	if(fn.call(scope || el, el, this, i) === false){
                break;
            }
        }
        return this;
    }
});
Ext.CompositeElementLite.prototype.on = Ext.CompositeElementLite.prototype.addListener;
if(Ext.DomQuery){
    Ext.Element.selectorFunction = Ext.DomQuery.select;
}

Ext.Element.select = function(selector, unique){
    var els;
    if(typeof selector == "string"){
        els = Ext.Element.selectorFunction(selector);
    }else if(selector.length !== undefined){
        els = selector;
    }else{
        throw "Invalid selector";
    }
    if(unique === true){
        return new Ext.CompositeElement(els);
    }else{
        return new Ext.CompositeElementLite(els);
    }
};
/**
 * Selects elements based on the passed CSS selector to enable working on them as 1.
 * @param {String/Array} selector The CSS selector or an array of elements
 * @param {Boolean} unique （可选） true to create a unique Ext.Element for each element (defaults to a shared flyweight object)
 * @return {CompositeElementLite/CompositeElement}
 * @member Ext
 * @method select
 */
Ext.select = Ext.Element.select;