menu.js

一个struts和extjs得源码

        this.parentMenu = parentMenu;
        if(!this.el){
            this.render();
        }
        this.fireEvent("beforeshow", this);
        this.showAt(this.el.getAlignToXY(el, pos || this.defaultAlign), parentMenu, false);
    },

    /**
     * Displays this menu at a specific xy position
     * @param {Array} xyPosition Contains X & Y [x, y] values for the position at which to show the menu (coordinates are page-based)
     * @param {Ext.menu.Menu} parentMenu (optional) This menu's parent menu, if applicable (defaults to undefined)
     */
    showAt : function(xy, parentMenu, /* private: */_e){
        this.parentMenu = parentMenu;
        if(!this.el){
            this.render();
        }
        if(_e !== false){
            this.fireEvent("beforeshow", this);
            xy = this.el.adjustForConstraints(xy);
        }
        this.el.setXY(xy);
        this.el.show();
        this.hidden = false;
        this.focus();
        this.fireEvent("show", this);
    },



    focus : function(){
        if(!this.hidden){
            this.doFocus.defer(50, this);
        }
    },

    doFocus : function(){
        if(!this.hidden){
            this.focusEl.focus();
        }
    },

    /**
     * Hides this menu and optionally all parent menus
     * @param {Boolean} deep (optional) True to hide all parent menus recursively, if any (defaults to false)
     */
    hide : function(deep){
        if(this.el && this.isVisible()){
            this.fireEvent("beforehide", this);
            if(this.activeItem){
                this.activeItem.deactivate();
                this.activeItem = null;
            }
            this.el.hide();
            this.hidden = true;
            this.fireEvent("hide", this);
        }
        if(deep === true && this.parentMenu){
            this.parentMenu.hide(true);
        }
    },

    /**
     * Adds one or more items of any type supported by the Menu class, or that can be converted into menu items.
     * Any of the following are valid:
     * <ul>
     * <li>Any menu item object based on {@link Ext.menu.BaseItem}</li>
     * <li>An HTMLElement object which will be converted to a menu item</li>
     * <li>A menu item config object that will be created as a new menu item</li>
     * <li>A string, which can either be '-' or 'separator' to add a menu separator, otherwise
     * it will be converted into a {@link Ext.menu.TextItem} and added</li>
     * </ul>
     * Usage:
     * <pre><code>
// Create the menu
var menu = new Ext.menu.Menu();

// Create a menu item to add by reference
var menuItem = new Ext.menu.Item({ text: 'New Item!' });

// Add a bunch of items at once using different methods.
// Only the last item added will be returned.
var item = menu.add(
    menuItem,                // add existing item by ref
    'Dynamic Item',          // new TextItem
    '-',                     // new separator
    { text: 'Config Item' }  // new item by config
);
</code></pre>
     * @param {Mixed} args One or more menu items, menu item configs or other objects that can be converted to menu items
     * @return {Ext.menu.Item} The menu item that was added, or the last one if multiple items were added
     */
    add : function(){
        var a = arguments, l = a.length, item;
        for(var i = 0; i < l; i++){
            var el = a[i];
            if(el.render){ // some kind of Item
                item = this.addItem(el);
            }else if(typeof el == "string"){ // string
                if(el == "separator" || el == "-"){
                    item = this.addSeparator();
                }else{
                    item = this.addText(el);
                }
            }else if(el.tagName || el.el){ // element
                item = this.addElement(el);
            }else if(typeof el == "object"){ // must be menu item config?
                Ext.applyIf(el, this.defaults);
                item = this.addMenuItem(el);
            }
        }
        return item;
    },

    /**
     * Returns this menu's underlying {@link Ext.Element} object
     * @return {Ext.Element} The element
     */
    getEl : function(){
        if(!this.el){
            this.render();
        }
        return this.el;
    },

    /**
     * Adds a separator bar to the menu
     * @return {Ext.menu.Item} The menu item that was added
     */
    addSeparator : function(){
        return this.addItem(new Ext.menu.Separator());
    },

    /**
     * Adds an {@link Ext.Element} object to the menu
     * @param {Mixed} el The element or DOM node to add, or its id
     * @return {Ext.menu.Item} The menu item that was added
     */
    addElement : function(el){
        return this.addItem(new Ext.menu.BaseItem(el));
    },

    /**
     * Adds an existing object based on {@link Ext.menu.BaseItem} to the menu
     * @param {Ext.menu.Item} item The menu item to add
     * @return {Ext.menu.Item} The menu item that was added
     */
    addItem : function(item){
        this.items.add(item);
        if(this.ul){
            var li = document.createElement("li");
            li.className = "x-menu-list-item";
            this.ul.dom.appendChild(li);
            item.render(li, this);
            this.delayAutoWidth();
        }
        return item;
    },

    /**
     * Creates a new {@link Ext.menu.Item} based an the supplied config object and adds it to the menu
     * @param {Object} config A MenuItem config object
     * @return {Ext.menu.Item} The menu item that was added
     */
    addMenuItem : function(config){
        if(!(config instanceof Ext.menu.Item)){
            if(typeof config.checked == "boolean"){ // must be check menu item config?
                config = new Ext.menu.CheckItem(config);
            }else{
                config = new Ext.menu.Item(config);
            }
        }
        return this.addItem(config);
    },

    /**
     * Creates a new {@link Ext.menu.TextItem} with the supplied text and adds it to the menu
     * @param {String} text The text to display in the menu item
     * @return {Ext.menu.Item} The menu item that was added
     */
    addText : function(text){
        return this.addItem(new Ext.menu.TextItem(text));
    },

    /**
     * Inserts an existing object based on {@link Ext.menu.BaseItem} to the menu at a specified index
     * @param {Number} index The index in the menu's list of current items where the new item should be inserted
     * @param {Ext.menu.Item} item The menu item to add
     * @return {Ext.menu.Item} The menu item that was added
     */
    insert : function(index, item){
        this.items.insert(index, item);
        if(this.ul){
            var li = document.createElement("li");
            li.className = "x-menu-list-item";
            this.ul.dom.insertBefore(li, this.ul.dom.childNodes[index]);
            item.render(li, this);
            this.delayAutoWidth();
        }
        return item;
    },

    /**
     * Removes an {@link Ext.menu.Item} from the menu and destroys the object
     * @param {Ext.menu.Item} item The menu item to remove
     */
    remove : function(item){
        this.items.removeKey(item.id);
        item.destroy();
    },

    /**
     * Removes and destroys all items in the menu
     */
    removeAll : function(){
    	if(this.items){
	        var f;
	        while(f = this.items.first()){
	            this.remove(f);
	        }
    	}
    },

    /**
     * Destroys the menu by  unregistering it from {@link Ext.menu.MenuMgr}, purging event listeners,
     * removing all of the menus items, then destroying the underlying {@link Ext.Element}
     */
    destroy : function(){
        this.beforeDestroy();
        Ext.menu.MenuMgr.unregister(this);
        if (this.keyNav) {
        	this.keyNav.disable();
        }
        this.removeAll();
        if (this.ul) {
        	this.ul.removeAllListeners();
        }
        if (this.el) {
        	this.el.destroy();
        }
    },

	// private
    beforeDestroy : Ext.emptyFn

});

// MenuNav is a private utility class used internally by the Menu
Ext.menu.MenuNav = function(menu){
    Ext.menu.MenuNav.superclass.constructor.call(this, menu.el);
    this.scope = this.menu = menu;
};

Ext.extend(Ext.menu.MenuNav, Ext.KeyNav, {
    doRelay : function(e, h){
        var k = e.getKey();
        if(!this.menu.activeItem && e.isNavKeyPress() && k != e.SPACE && k != e.RETURN){
            this.menu.tryActivate(0, 1);
            return false;
        }
        return h.call(this.scope || this, e, this.menu);
    },

    up : function(e, m){
        if(!m.tryActivate(m.items.indexOf(m.activeItem)-1, -1)){
            m.tryActivate(m.items.length-1, -1);
        }
    },

    down : function(e, m){
        if(!m.tryActivate(m.items.indexOf(m.activeItem)+1, 1)){
            m.tryActivate(0, 1);
        }
    },

    right : function(e, m){
        if(m.activeItem){
            m.activeItem.expandMenu(true);
        }
    },

    left : function(e, m){
        m.hide();
        if(m.parentMenu && m.parentMenu.activeItem){
            m.parentMenu.activeItem.activate();
        }
    },

    enter : function(e, m){
        if(m.activeItem){
            e.stopPropagation();
            m.activeItem.onClick(e);
            m.fireEvent("click", this, m.activeItem);
            return true;
        }
    }
});