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

     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]);
            }
            return this;
        },

        /**
        * Clears this composite and adds the elements returned by the passed selector.
        * @param {String/Array} els A string CSS selector, an array of elements or an element
        * @return {CompositeElement} this
        */
        fill : function(els){
            this.elements = [];
            this.add(els);
            return this;
        },

        /**
        * Filters this composite to only elements that match the passed selector.
        * @param {String} selector A string CSS selector
        * @return {CompositeElement} this
        */
        filter : function(selector){
            var els = [];
            this.each(function(el){
                if(el.is(selector)){
                    els[els.length] = el.dom;
                }
            });
            this.fill(els);
            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 (optional) 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] || null;
        },

        /**
         * Returns the first Element
         * @return {Ext.Element}
         */
        first : function(){
            return this.item(0);
        },

        /**
         * Returns the last Element
         * @return {Ext.Element}
         */
        last : function(){
            return this.item(this.elements.length-1);
        },

        /**
         * Returns the number of elements in this composite
         * @return Number
         */
        getCount : function(){
            return this.elements.length;
        },

        /**
         * Returns true if this composite contains the passed element
         * @param el {Mixed} The id of an element, or an Ext.Element, or an HtmlElement to find within the composite collection.
         * @return Boolean
         */
        contains : function(el){
            return this.indexOf(el) !== -1;
        },

        /**
         * 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.get(el));
        },

        /**
        * Removes the specified element(s).
        * @param {Mixed} el The id of an element, the Element itself, the index of the element in this composite
        * or an array of any of those.
        * @param {Boolean} removeDom (optional) True to also remove the element from the document
        * @return {CompositeElement} this
        */
        removeElement : function(el, removeDom){
            if(Ext.isArray(el)){
                for(var i = 0, len = el.length; i < len; i++){
                    this.removeElement(el[i]);
                }
                return this;
            }
            var index = typeof el == 'number' ? el : this.indexOf(el);
            if(index !== -1 && this.elements[index]){
                if(removeDom){
                    var d = this.elements[index];
                    if(d.dom){
                        d.remove();
                    }else{
                        Ext.removeNode(d);
                    }
                }
                this.elements.splice(index, 1);
            }
            return this;
        },

        /**
        * 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 = typeof el == 'number' ? el : this.indexOf(el);
            if(index !== -1){
                if(domReplace){
                    this.elements[index].replaceWith(replacement);
                }else{
                    this.elements.splice(index, 1, Ext.get(replacement))
                }
            }
            return this;
        },

        /**
         * Removes all elements.
         */
        clear : function(){
            this.elements = [];
        }
    };
    (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.
     <pre><code>
     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);
     </code></pre><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);
        this.el = new Ext.Element.Flyweight();
    };
    Ext.extend(Ext.CompositeElementLite, Ext.CompositeElement, {
        addElements : function(els){
            if(els){
                if(Ext.isArray(els)){
                    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){
            if(!this.elements[index]){
                return null;
            }
            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 (optional) 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;
        },

        indexOf : function(el){
            return this.elements.indexOf(Ext.getDom(el));
        },

        replaceElement : function(el, replacement, domReplace){
            var index = typeof el == 'number' ? el : this.indexOf(el);
            if(index !== -1){
                replacement = Ext.getDom(replacement);
                if(domReplace){
                    var d = this.elements[index];
                    d.parentNode.insertBefore(replacement, d);
                    Ext.removeNode(d);
                }
                this.elements.splice(index, 1, replacement);
            }
            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, root){
        var els;
        if(typeof selector == "string"){
            els = Ext.Element.selectorFunction(selector, root);
        }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 (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;

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