menu.js

来自「Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含」· JavaScript 代码 · 共 700 行 · 第 1/2 页

        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 || item.isFormField)){
                this.setActiveItem(item, false);
                return item;
            }
        }
        return false;
    },

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

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

    // private
    onScroll: function(e, t){
        if(e){
            e.stopEvent();
        }
        var ul = this.ul.dom, top = Ext.fly(t).is('.x-menu-scroller-top');
        ul.scrollTop += this.scrollIncrement * (top ? -1 : 1);
        if(top ? ul.scrollTop <= 0 : ul.scrollTop + this.activeMax >= ul.scrollHeight){
           this.onScrollerOut(null, t);
        }
    },

    // private
    onScrollerIn: function(e, t){
        var ul = this.ul.dom, top = Ext.fly(t).is('.x-menu-scroller-top');
        if(top ? ul.scrollTop > 0 : ul.scrollTop + this.activeMax < ul.scrollHeight){
            Ext.fly(t).addClass(['x-menu-item-active', 'x-menu-scroller-active']);
        }
    },

    // private
    onScrollerOut: function(e, t){
        Ext.fly(t).removeClass(['x-menu-item-active', 'x-menu-scroller-active']);
    },

    /**
     * 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){
        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);
        }
        Ext.menu.Menu.superclass.onShow.call(this);
        this.el.setXY(xy);
        if(this.enableScrolling){
            this.constrainScroll(xy[1]);     
        }
        this.el.show();
        if(Ext.isIE){
           this.layout.doAutoSize();
        }
        this.hidden = false;
        this.focus();
        this.fireEvent("show", this);
    },

    constrainScroll: function(y){
        var max, full = this.ul.setHeight('auto').getHeight();
        if (this.maxHeight){
            max = this.maxHeight - (this.scrollerHeight * 3);
        }else{
            var ct = Ext.get(this.el.dom.parentNode);
            max = Ext.fly(this.el.dom.parentNode).getViewSize().height - y - (this.scrollerHeight * 3);
        }
        if (full > max && max > 0){
            this.activeMax = max;
            this.ul.setHeight(max);
            this.createScrollers();
        }else{
            this.ul.setHeight(full);
            this.el.select('.x-menu-scroller').setDisplayed('none');
        }
        this.ul.dom.scrollTop = 0;
    },

    createScrollers: function(){
        if(!this.scroller){
            this.scroller = {
                pos: 0,
                top: this.el.insertFirst({
                    tag: 'div',
                    cls: 'x-menu-scroller x-menu-scroller-top',
                    html: '&nbsp;'
                }),
                bottom: this.el.createChild({
                    tag: 'div',
                    cls: 'x-menu-scroller x-menu-scroller-bottom',
                    html: '&nbsp;'
                })
            };
            this.scroller.top.hover(this.onScrollerIn, this.onScrollerOut, this);
            this.scroller.topRepeater = new Ext.util.ClickRepeater(this.scroller.top, {
                listeners: {
                    click: this.onScroll.createDelegate(this, [null, this.scroller.top], false)
                }
            });
            this.scroller.bottom.hover(this.onScrollerIn, this.onScrollerOut, this);
            this.scroller.bottomRepeater = new Ext.util.ClickRepeater(this.scroller.bottom, {
                listeners: {
                    click: this.onScroll.createDelegate(this, [null, this.scroller.bottom], false)
                }
            });
        }
    },

    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){
            Ext.menu.Menu.superclass.hide.call(this);
            this.el.hide();
            if(deep === true && this.parentMenu){
                this.parentMenu.hide(true);
            }
        }
    },

    // private
    onHide: function(){
        Ext.menu.Menu.superclass.onHide.call(this);
        this.deactivateActive();
    },

    // private
    lookupComponent: function(c){
        var item;
        if(c.render){ // some kind of Component
            item = c;
         }else if(typeof c == "string"){ // string
             if(c == "separator" || c == "-"){
                 item = new Ext.menu.Separator();
             }else{
                 item = new Ext.menu.TextItem(c);
             }
         }else if(c.tagName || c.el){ // element. Wrap it.
             item = new Ext.BoxComponent({
                el: c
             })
         }else if(typeof c == "object"){ // must be menu item config?
             Ext.applyIf(c, this.defaults);
             item = this.getMenuItem(c);
         }
         return item;
    },

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

    // private
    getMenuItem: function(config){
       if(!(config.isXType && config.isXType(Ext.menu.Item))){
            if(config.xtype){
                return Ext.ComponentMgr.create(config, this.defaultType);
            }else if(typeof config.checked == "boolean"){ // must be check menu item config?
                return new Ext.menu.CheckItem(config);
            }else{
                return new Ext.menu.Item(config);
            }
        }
        return 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.add(new Ext.menu.TextItem(text));
    },

    //private
    onDestroy : function(){
        Ext.menu.Menu.superclass.onDestroy.call(this);
        Ext.menu.MenuMgr.unregister(this);
        Ext.EventManager.removeResizeListener(this.hide, this);
        if(this.keyNav) {
            this.keyNav.disable();
        }
        var s = this.scroller;
        if(s){
            Ext.destroy(s.topRepeater, s.bottomRepeater, s.top, s.bottom);    
        }
    }
});

Ext.reg('menu', Ext.menu.Menu);

// MenuNav is a private utility class used internally by the Menu
Ext.menu.MenuNav = Ext.extend(Ext.KeyNav, function(){
    function up(e, m){
        if(!m.tryActivate(m.items.indexOf(m.activeItem)-1, -1)){
            m.tryActivate(m.items.length-1, -1);
        }
    }
    function down(e, m){
        if(!m.tryActivate(m.items.indexOf(m.activeItem)+1, 1)){
            m.tryActivate(0, 1);
        }
    }
    return {
        constructor: function(menu){
            Ext.menu.MenuNav.superclass.constructor.call(this, menu.el);
            this.scope = this.menu = menu;
        },

        doRelay : function(e, h){
            var k = e.getKey();
//          Keystrokes within a form Field (eg: down in a Combo) do not navigate. Allow only TAB
            if (this.menu.activeItem && this.menu.activeItem.isFormField && k != e.TAB) {
                return false;
            }
            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);
        },

        tab: function(e, m) {
            e.stopEvent();
            if (e.shiftKey) {
                up(e, m);
            } else {
                down(e, m);
            }
        },

        up : up,

        down : down,

        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;
            }
        }
    };
}());