menu.js

一个struts和extjs得源码

/*
 * Ext JS Library 2.2.1
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.menu.Menu
 * @extends Ext.util.Observable
 * A menu object.  This is the container to which you add all other menu items.  Menu can also serve as a base class
 * when you want a specialized menu based off of another component (like {@link Ext.menu.DateMenu} for example).
 * @constructor
 * Creates a new Menu
 * @param {Object} config Configuration options
 */
Ext.menu.Menu = function(config){
    if(Ext.isArray(config)){
        config = {items:config};
    }
    Ext.apply(this, config);
    this.id = this.id || Ext.id();
    this.addEvents(
        /**
         * @event beforeshow
         * Fires before this menu is displayed
         * @param {Ext.menu.Menu} this
         */
        'beforeshow',
        /**
         * @event beforehide
         * Fires before this menu is hidden
         * @param {Ext.menu.Menu} this
         */
        'beforehide',
        /**
         * @event show
         * Fires after this menu is displayed
         * @param {Ext.menu.Menu} this
         */
        'show',
        /**
         * @event hide
         * Fires after this menu is hidden
         * @param {Ext.menu.Menu} this
         */
        'hide',
        /**
         * @event click
         * Fires when this menu is clicked (or when the enter key is pressed while it is active)
         * @param {Ext.menu.Menu} this
         * @param {Ext.menu.Item} menuItem The menu item that was clicked
         * @param {Ext.EventObject} e
         */
        'click',
        /**
         * @event mouseover
         * Fires when the mouse is hovering over this menu
         * @param {Ext.menu.Menu} this
         * @param {Ext.EventObject} e
         * @param {Ext.menu.Item} menuItem The menu item that was clicked
         */
        'mouseover',
        /**
         * @event mouseout
         * Fires when the mouse exits this menu
         * @param {Ext.menu.Menu} this
         * @param {Ext.EventObject} e
         * @param {Ext.menu.Item} menuItem The menu item that was clicked
         */
        'mouseout',
        /**
         * @event itemclick
         * Fires when a menu item contained in this menu is clicked
         * @param {Ext.menu.BaseItem} baseItem The BaseItem that was clicked
         * @param {Ext.EventObject} e
         */
        'itemclick'
    );
    Ext.menu.MenuMgr.register(this);
    Ext.menu.Menu.superclass.constructor.call(this);
    var mis = this.items;
    /**
     * A MixedCollection of this Menu's items
     * @property items
     * @type Ext.util.MixedCollection
     */

    this.items = new Ext.util.MixedCollection();
    if(mis){
        this.add.apply(this, mis);
    }
};

Ext.extend(Ext.menu.Menu, Ext.util.Observable, {
    /**
     * @cfg {Object} defaults
     * A config object that will be applied to all items added to this container either via the {@link #items}
     * config or via the {@link #add} method.  The defaults config can contain any number of
     * name/value property pairs to be added to each item, and should be valid for the types of items
     * being added to the menu.
     */
    /**
     * @cfg {Mixed} items
     * An array of items to be added to this menu.  See {@link #add} for a list of valid item types.
     */
    /**
     * @cfg {Number} minWidth The minimum width of the menu in pixels (defaults to 120)
     */
    minWidth : 120,
    /**
     * @cfg {Boolean/String} shadow True or "sides" for the default effect, "frame" for 4-way shadow, and "drop"
     * for bottom-right shadow (defaults to "sides")
     */
    shadow : "sides",
    /**
     * @cfg {String} subMenuAlign The {@link Ext.Element#alignTo} anchor position value to use for submenus of
     * this menu (defaults to "tl-tr?")
     */
    subMenuAlign : "tl-tr?",
    /**
     * @cfg {String} defaultAlign The default {@link Ext.Element#alignTo} anchor position value for this menu
     * relative to its element of origin (defaults to "tl-bl?")
     */
    defaultAlign : "tl-bl?",
    /**
     * @cfg {Boolean} allowOtherMenus True to allow multiple menus to be displayed at the same time (defaults to false)
     */
    allowOtherMenus : false,
    /**
     * @cfg {Boolean} ignoreParentClicks True to ignore clicks on any item in this menu that is a parent item (displays
     * a submenu) so that the submenu is not dismissed when clicking the parent item (defaults to false).
     */
    ignoreParentClicks : false,

    // private
    hidden:true,

    // private
    createEl : function(){
        return new Ext.Layer({
            cls: "x-menu",
            shadow:this.shadow,
            constrain: false,
            parentEl: this.parentEl || document.body,
            zindex:15000
        });
    },

    // private
    render : function(){
        if(this.el){
            return;
        }
        var el = this.el = this.createEl();

        if(!this.keyNav){
            this.keyNav = new Ext.menu.MenuNav(this);
        }
        if(this.plain){
            el.addClass("x-menu-plain");
        }
        if(this.cls){
            el.addClass(this.cls);
        }
        // generic focus element
        this.focusEl = el.createChild({
            tag: "a", cls: "x-menu-focus", href: "#", onclick: "return false;", tabIndex:"-1"
        });
        var ul = el.createChild({tag: "ul", cls: "x-menu-list"});
        ul.on("click", this.onClick, this);
        ul.on("mouseover", this.onMouseOver, this);
        ul.on("mouseout", this.onMouseOut, this);
        this.items.each(function(item){
            var li = document.createElement("li");
            li.className = "x-menu-list-item";
            ul.dom.appendChild(li);
            item.render(li, this);
        }, this);
        this.ul = ul;
        this.autoWidth();
    },

    // private
    autoWidth : function(){
        var el = this.el, ul = this.ul;
        if(!el){
            return;
        }
        var w = this.width;
        if(w){
            el.setWidth(w);
        }else if(Ext.isIE){
            el.setWidth(this.minWidth);
            var t = el.dom.offsetWidth; // force recalc
            el.setWidth(ul.getWidth()+el.getFrameWidth("lr"));
        }
    },

    // private
    delayAutoWidth : function(){
        if(this.el){
            if(!this.awTask){
                this.awTask = new Ext.util.DelayedTask(this.autoWidth, this);
            }
            this.awTask.delay(20);
        }
    },

    // private
    findTargetItem : function(e){
        var t = e.getTarget(".x-menu-list-item", this.ul,  true);
        if(t && t.menuItemId){
            return this.items.get(t.menuItemId);
        }
    },

    // private
    onClick : function(e){
        var t;
        if(t = this.findTargetItem(e)){
            if(t.menu && this.ignoreParentClicks){
                t.expandMenu();
            }else{
                t.onClick(e);
                this.fireEvent("click", this, t, e);
            }
        }
    },

    // private
    setActiveItem : function(item, autoExpand){
        if(item != this.activeItem){
            if(this.activeItem){
                this.activeItem.deactivate();
            }
            this.activeItem = item;
            item.activate(autoExpand);
        }else if(autoExpand){
            item.expandMenu();
        }
    },

    // private
    tryActivate : function(start, step){
        var items = this.items;
        for(var i = start, len = items.length; i >= 0 && i < len; i+= step){
            var item = items.get(i);
            if(!item.disabled && item.canActivate){
                this.setActiveItem(item, false);
                return item;
            }
        }
        return false;
    },

    // private
    onMouseOver : function(e){
        var t;
        if(t = this.findTargetItem(e)){
            if(t.canActivate && !t.disabled){
                this.setActiveItem(t, true);
            }
        }
        this.over = true;
        this.fireEvent("mouseover", this, e, t);
    },

    // private
    onMouseOut : function(e){
        var t;
        if(t = this.findTargetItem(e)){
            if(t == this.activeItem && t.shouldDeactivate(e)){
                this.activeItem.deactivate();
                delete this.activeItem;
            }
        }
        this.over = false;
        this.fireEvent("mouseout", this, e, t);
    },

    /**
     * Read-only.  Returns true if the menu is currently displayed, else false.
     * @type Boolean
     */
    isVisible : function(){
        return this.el && !this.hidden;
    },

    /**
     * Displays this menu relative to another element
     * @param {Mixed} element The element to align to
     * @param {String} position (optional) The {@link Ext.Element#alignTo} anchor position to use in aligning to
     * the element (defaults to this.defaultAlign)
     * @param {Ext.menu.Menu} parentMenu (optional) This menu's parent menu, if applicable (defaults to undefined)
     */
    show : function(el, pos, parentMenu){