tabpanel.js

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    // private
    onBeforeAdd : function(item){
        var existing = item.events ? (this.items.containsKey(item.id) ? item : null) : this.items.get(item);
        if(existing){
            this.setActiveTab(item);
            return false;
        }
        Ext.TabPanel.superclass.onBeforeAdd.apply(this, arguments);
        var es = item.elements;
        item.elements = es ? es.replace(',header', '') : es;
        item.border = (item.border === true);
    },

    // private
    onRemove : function(tp, item){
        Ext.removeNode(this.getTabEl(item));
        this.stack.remove(item);
        if(item == this.activeTab){
            var next = this.stack.next();
            if(next){
                this.setActiveTab(next);
            }else{
                this.setActiveTab(0);
            }
        }
        this.delegateUpdates();
    },

    // private
    onBeforeShowItem : function(item){
        if(item != this.activeTab){
            this.setActiveTab(item);
            return false;
        }
    },

    // private
    onItemDisabled : function(item){
        var el = this.getTabEl(item);
        if(el){
            Ext.fly(el).addClass('x-item-disabled');
        }
        this.stack.remove(item);
    },

    // private
    onItemEnabled : function(item){
        var el = this.getTabEl(item);
        if(el){
            Ext.fly(el).removeClass('x-item-disabled');
        }
    },

    // private
    onItemTitleChanged : function(item){
        var el = this.getTabEl(item);
        if(el){
            Ext.fly(el).child('span.x-tab-strip-text', true).innerHTML = item.title;
        }
    },

    /**
     * Gets the DOM element for a specified tab.
     * @param {Panel} tab The tab
     * @return {HTMLElement} The DOM node
     */
    getTabEl : function(item){
        return document.getElementById(this.id+'__'+item.id);
    },

    // private
    onResize : function(){
        Ext.TabPanel.superclass.onResize.apply(this, arguments);
        this.delegateUpdates();
    },

    /**
     * Suspends any internal calculations or scrolling while doing a bulk operation. See {@link #endUpdate}
     */
    beginUpdate : function(){
        this.suspendUpdates = true;
    },

    /**
     * Resumes calculations and scrolling at the end of a bulk operation. See {@link #beginUpdate}
     */
    endUpdate : function(){
        this.suspendUpdates = false;
        this.delegateUpdates();
    },

    /**
     * Hides the tab strip item for the passed tab
     * @param {Number/String/Panel} item The tab index, id or item
     */
    hideTabStripItem : function(item){
        item = this.getComponent(item);
        var el = this.getTabEl(item);
        if(el){
            el.style.display = 'none';
            this.delegateUpdates();
        }
    },

    /**
     * Unhides the tab strip item for the passed tab
     * @param {Number/String/Panel} item The tab index, id or item
     */
    unhideTabStripItem : function(item){
        item = this.getComponent(item);
        var el = this.getTabEl(item);
        if(el){
            el.style.display = '';
            this.delegateUpdates();
        }
    },

    // private
    delegateUpdates : function(){
        if(this.suspendUpdates){
            return;
        }
        if(this.resizeTabs && this.rendered){
            this.autoSizeTabs();
        }
        if(this.enableTabScroll && this.rendered){
            this.autoScrollTabs();
        }
    },

    // private
    autoSizeTabs : function(){
        var count = this.items.length;
        var ow = this.header.dom.offsetWidth;
        var aw = this.header.dom.clientWidth;

        if(!this.resizeTabs || count < 1 || !aw){ // !aw for display:none
            return;
        }
        
        var each = Math.max(Math.min(Math.floor((aw-4) / count) - this.tabMargin, this.tabWidth), this.minTabWidth); // -4 for float errors in IE
        this.lastTabWidth = each;
        var lis = this.stripWrap.dom.getElementsByTagName('li');
        for(var i = 0, len = lis.length-1; i < len; i++) { // -1 for the "edge" li
            var li = lis[i];
            var inner = li.childNodes[1].firstChild.firstChild;
            var tw = li.offsetWidth;
            var iw = inner.offsetWidth;
            inner.style.width = (each - (tw-iw)) + 'px';
        }
    },

    // private
    adjustBodyWidth : function(w){
        if(this.header){
            this.header.setWidth(w);
        }
        if(this.footer){
            this.footer.setWidth(w);
        }
        return w;
    },

    /**
     * Sets the specified tab as the active tab. This method fires the {@link #beforetabchange} event which
     * can return false to cancel the tab change.
     * @param {String/Panel} tab The id or tab Panel to activate
     */
    setActiveTab : function(item){
        item = this.getComponent(item);
        if(!item || this.fireEvent('beforetabchange', this, item, this.activeTab) === false){
            return;
        }
        if(!this.rendered){
            this.activeTab = item;
            return;
        }
        if(this.activeTab != item){
            if(this.activeTab){
                var oldEl = this.getTabEl(this.activeTab);
                if(oldEl){
                    Ext.fly(oldEl).removeClass('x-tab-strip-active');
                }
                this.activeTab.fireEvent('deactivate', this.activeTab);
            }
            var el = this.getTabEl(item);
            Ext.fly(el).addClass('x-tab-strip-active');
            this.activeTab = item;
            this.stack.add(item);

            this.layout.setActiveItem(item);

            if(this.scrolling){
                this.scrollToTab(item, this.animScroll);
            }

            item.fireEvent('activate', item);
            this.fireEvent('tabchange', this, item);
        }
    },

    /**
     * Gets the currently active tab.
     * @return {Panel} The active tab
     */
    getActiveTab : function(){
        return this.activeTab || null;
    },

    /**
     * Gets the specified tab by id.
     * @param {String} id The tab id
     * @return {Panel} The tab
     */
    getItem : function(item){
        return this.getComponent(item);
    },

    // private
    autoScrollTabs : function(){
        var count = this.items.length;
        var ow = this.header.dom.offsetWidth;
        var tw = this.header.dom.clientWidth;

        var wrap = this.stripWrap;
        var cw = wrap.dom.offsetWidth;
        var pos = this.getScrollPos();
        var l = this.edge.getOffsetsTo(this.stripWrap)[0] + pos;

        if(!this.enableTabScroll || count < 1 || cw < 20){ // 20 to prevent display:none issues
            return;
        }
        if(l <= tw){
            wrap.dom.scrollLeft = 0;
            wrap.setWidth(tw);
            if(this.scrolling){
                this.scrolling = false;
                this.header.removeClass('x-tab-scrolling');
                this.scrollLeft.hide();
                this.scrollRight.hide();
            }
        }else{
            if(!this.scrolling){
                this.header.addClass('x-tab-scrolling');
            }
            tw -= wrap.getMargins('lr');
            wrap.setWidth(tw > 20 ? tw : 20);
            if(!this.scrolling){
                if(!this.scrollLeft){
                    this.createScrollers();
                }else{
                    this.scrollLeft.show();
                    this.scrollRight.show();
                }
            }
            this.scrolling = true;
            if(pos > (l-tw)){ // ensure it stays within bounds
                wrap.dom.scrollLeft = l-tw;
            }else{ // otherwise, make sure the active tab is still visible
                this.scrollToTab(this.activeTab, false);
            }
            this.updateScrollButtons();
        }
    },

    // private
    createScrollers : function(){
        var h = this.stripWrap.dom.offsetHeight;

        // left
        var sl = this.header.insertFirst({
            cls:'x-tab-scroller-left'
        });
        sl.setHeight(h);
        sl.addClassOnOver('x-tab-scroller-left-over');
        this.leftRepeater = new Ext.util.ClickRepeater(sl, {
            interval : this.scrollRepeatInterval,
            handler: this.onScrollLeft,
            scope: this
        });
        this.scrollLeft = sl;

        // right
        var sr = this.header.insertFirst({
            cls:'x-tab-scroller-right'
        });
        sr.setHeight(h);
        sr.addClassOnOver('x-tab-scroller-right-over');
        this.rightRepeater = new Ext.util.ClickRepeater(sr, {
            interval : this.scrollRepeatInterval,
            handler: this.onScrollRight,
            scope: this
        });
        this.scrollRight = sr;
    },

    // private
    getScrollWidth : function(){
        return this.edge.getOffsetsTo(this.stripWrap)[0] + this.getScrollPos();
    },

    // private
    getScrollPos : function(){
        return parseInt(this.stripWrap.dom.scrollLeft, 10) || 0;
    },

    // private
    getScrollArea : function(){
        return parseInt(this.stripWrap.dom.clientWidth, 10) || 0;
    },

    // private
    getScrollAnim : function(){
        return {duration:this.scrollDuration, callback: this.updateScrollButtons, scope: this};
    },

    // private
    getScrollIncrement : function(){
        return this.scrollIncrement || (this.resizeTabs ? this.lastTabWidth+2 : 100);
    },

    /**
     * Scrolls to a particular tab if tab scrolling is enabled
     * @param {Panel} item The item to scroll to
     * @param {Boolean} animate True to enable animations
     */

    scrollToTab : function(item, animate){
        if(!item){ return; }
        var el = this.getTabEl(item);
        var pos = this.getScrollPos(), area = this.getScrollArea();
        var left = Ext.fly(el).getOffsetsTo(this.stripWrap)[0] + pos;
        var right = left + el.offsetWidth;
        if(left < pos){
            this.scrollTo(left, animate);
        }else if(right > (pos + area)){
            this.scrollTo(right - area, animate);
        }
    },

    // private
    scrollTo : function(pos, animate){
        this.stripWrap.scrollTo('left', pos, animate ? this.getScrollAnim() : false);
        if(!animate){
            this.updateScrollButtons();
        }
    },

    // private
    onScrollRight : function(){
        var sw = this.getScrollWidth()-this.getScrollArea();
        var pos = this.getScrollPos();
        var s = Math.min(sw, pos + this.getScrollIncrement());
        if(s != pos){
            this.scrollTo(s, this.animScroll);
        }        
    },

    // private
    onScrollLeft : function(){
        var pos = this.getScrollPos();
        var s = Math.max(0, pos - this.getScrollIncrement());
        if(s != pos){
            this.scrollTo(s, this.animScroll);
        }
    },

    // private
    updateScrollButtons : function(){
        var pos = this.getScrollPos();
        this.scrollLeft[pos == 0 ? 'addClass' : 'removeClass']('x-tab-scroller-left-disabled');
        this.scrollRight[pos >= (this.getScrollWidth()-this.getScrollArea()) ? 'addClass' : 'removeClass']('x-tab-scroller-right-disabled');
    }
});
Ext.reg('tabpanel', Ext.TabPanel);

/**
 * Sets the specified tab as the active tab. This method fires the {@link #beforetabchange} event which
 * can return false to cancel the tab change.
 * @param {String/Panel} tab The id or tab Panel to activate
 * @method activate
 */
Ext.TabPanel.prototype.activate = Ext.TabPanel.prototype.setActiveTab;

// private utility class used by TabPanel
Ext.TabPanel.AccessStack = function(){
    var items = [];
    return {
        add : function(item){
            items.push(item);
            if(items.length > 10){
                items.shift();
            }
        },

        remove : function(item){
            var s = [];
            for(var i = 0, len = items.length; i < len; i++) {
                if(items[i] != item){
                    s.push(items[i]);
                }
            }
            items = s;
        },

        next : function(){
            return items.pop();
        }
    };
};