component.js

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                this.hide();
            }
            if(this.disabled){
                this.disable();
            }

            this.initStateEvents();
        }
        return this;
    },

    // private
    initState : function(config){
        if(Ext.state.Manager){
            var state = Ext.state.Manager.get(this.stateId || this.id);
            if(state){
                this.applyState(state);
            }
        }
    },

    // private
    initStateEvents : function(){
        if(this.stateEvents){
            for(var i = 0, e; e = this.stateEvents[i]; i++){
                this.on(e, this.saveState, this, {delay:100});
            }
        }
    },

    // private
    applyState : function(state, config){
        if(state){
            Ext.apply(this, state);
        }
    },

    // private
    getState : function(){
        return null;
    },

    // private
    saveState : function(){
        if(Ext.state.Manager){
            Ext.state.Manager.set(this.stateId || this.id, this.getState());
        }
    },

    /**
     * Apply this component to existing markup that is valid. With this function, no call to render() is required.
     * @param {String/HTMLElement} el 
     */
    applyToMarkup : function(el){
        this.allowDomMove = false;
        this.el = Ext.get(el);
        this.render(this.el.dom.parentNode);
    },

    /**
     * Adds a CSS class to the component's underlying element.
     * @param {string} cls The CSS class name to add
     */
    addClass : function(cls){
        if(this.el){
            this.el.addClass(cls);
        }else{
            this.cls = this.cls ? this.cls + ' ' + cls : cls;
        }
    },

    /**
     * Removes a CSS class from the component's underlying element.
     * @param {string} cls The CSS class name to remove
     */
    removeClass : function(cls){
        if(this.el){
            this.el.removeClass(cls);
        }else if(this.cls){
            this.cls = this.cls.split(' ').remove(cls).join(' ');
        }
    },

    // private
    // default function is not really useful
    onRender : function(ct, position){
        if(this.autoEl){
            if(typeof this.autoEl == 'string'){
                this.el = document.createElement(this.autoEl);
            }else{
                var div = document.createElement('div');
                Ext.DomHelper.overwrite(div, this.autoEl);
                this.el = div.firstChild;
            }
        }
        if(this.el){
            this.el = Ext.get(this.el);
            if(this.allowDomMove !== false){
                ct.dom.insertBefore(this.el.dom, position);
            }
        }
    },

    // private
    getAutoCreate : function(){
        var cfg = typeof this.autoCreate == "object" ?
                      this.autoCreate : Ext.apply({}, this.defaultAutoCreate);
        if(this.id && !cfg.id){
            cfg.id = this.id;
        }
        return cfg;
    },

    // private
    afterRender : Ext.emptyFn,

    /**
     * Destroys this component by purging any event listeners, removing the component's element from the DOM,
     * removing the component from its {@link Ext.Container} (if applicable) and unregistering it from
     * {@link Ext.ComponentMgr}.  Destruction is generally handled automatically by the framework and this method
     * should usually not need to be called directly.
     */
    destroy : function(){
        if(this.fireEvent("beforedestroy", this) !== false){
            this.beforeDestroy();
            if(this.rendered){
                this.el.removeAllListeners();
                this.el.remove();
                if(this.actionMode == "container"){
                    this.container.remove();
                }
            }
            this.onDestroy();
            Ext.ComponentMgr.unregister(this);
            this.fireEvent("destroy", this);
            this.purgeListeners();
        }
    },

	// private
    beforeDestroy : function(){

    },

	// private
    onDestroy : function(){

    },

    /**
     * Returns the underlying {@link Ext.Element}.
     * @return {Ext.Element} The element
     */
    getEl : function(){
        return this.el;
    },

    /**
     * Returns the id of this component.
     * @return {String}
     */
    getId : function(){
        return this.id || (this.id = "ext-comp-" + (++Ext.Component.AUTO_ID));
    },

    /**
     * Try to focus this component.
     * @param {Boolean} selectText (optional) If applicable, true to also select the text in this component
     * @return {Ext.Component} this
     */
    focus : function(selectText){
        if(this.rendered){
            this.el.focus();
            if(selectText === true){
                this.el.dom.select();
            }
        }
        return this;
    },

    // private
    blur : function(){
        if(this.rendered){
            this.el.blur();
        }
        return this;
    },

    /**
     * Disable this component.
     * @return {Ext.Component} this
     */
    disable : function(){
        if(this.rendered){
            this.onDisable();
        }
        this.disabled = true;
        this.fireEvent("disable", this);
        return this;
    },

	// private
    onDisable : function(){
        this.getActionEl().addClass(this.disabledClass);
        this.el.dom.disabled = true;
    },

    /**
     * Enable this component.
     * @return {Ext.Component} this
     */
    enable : function(){
        if(this.rendered){
            this.onEnable();
        }
        this.disabled = false;
        this.fireEvent("enable", this);
        return this;
    },

	// private
    onEnable : function(){
        this.getActionEl().removeClass(this.disabledClass);
        this.el.dom.disabled = false;
    },

    /**
     * Convenience function for setting disabled/enabled by boolean.
     * @param {Boolean} disabled
     */
    setDisabled : function(disabled){
        this[disabled ? "disable" : "enable"]();
    },

    /**
     * Show this component.
     * @return {Ext.Component} this
     */
    show: function(){
        if(this.fireEvent("beforeshow", this) !== false){
            this.hidden = false;
            if(this.autoRender){
                this.render(typeof this.autoRender == 'boolean' ? Ext.getBody() : this.autoRender);
            }
            if(this.rendered){
                this.onShow();
            }
            this.fireEvent("show", this);
        }
        return this;
    },

    // private
    onShow : function(){
        if(this.hideParent){
            this.container.removeClass('x-hide-' + this.hideMode);
        }else{
            this.getActionEl().removeClass('x-hide-' + this.hideMode);
        }

    },

    /**
     * Hide this component.
     * @return {Ext.Component} this
     */
    hide: function(){
        if(this.fireEvent("beforehide", this) !== false){
            this.hidden = true;
            if(this.rendered){
                this.onHide();
            }
            this.fireEvent("hide", this);
        }
        return this;
    },

    // private
    onHide : function(){
        if(this.hideParent){
            this.container.addClass('x-hide-' + this.hideMode);
        }else{
            this.getActionEl().addClass('x-hide-' + this.hideMode);
        }
    },

    /**
     * Convenience function to hide or show this component by boolean.
     * @param {Boolean} visible True to show, false to hide
     * @return {Ext.Component} this
     */
    setVisible: function(visible){
        if(visible) {
            this.show();
        }else{
            this.hide();
        }
        return this;
    },

    /**
     * Returns true if this component is visible.
     */
    isVisible : function(){
        return this.rendered && this.getActionEl().isVisible();
    },

    /**
     * Clone the current component using the original config values passed into this instance by default.
     * @param {Object} overrides A new config containing any properties to override in the cloned version.
     * An id property can be passed on this object, otherwise one will be generated to avoid duplicates.
     * @return {Ext.Component} clone The cloned copy of this component
     */
    cloneConfig : function(overrides){
        overrides = overrides || {};
        var id = overrides.id || Ext.id();
        var cfg = Ext.applyIf(overrides, this.initialConfig);
        cfg.id = id; // prevent dup id
        return new this.constructor(cfg);
    },

    /**
     * Gets the xtype for this component as registered with {@link Ext.ComponentMgr}. For a list of all
     * available xtypes, see the {@link Ext.Component} header. Example usage:
     * <pre><code>
var t = new Ext.form.TextField();
alert(t.getXType());  // alerts 'textfield'
</code></pre>
     * @return {String} The xtype
     */
    getXType : function(){
        return this.constructor.xtype;
    },

    /**
     * Tests whether or not this component is of a specific xtype. This can test whether this component is descended
     * from the xtype (default) or whether it is directly of the xtype specified (shallow = true). For a list of all
     * available xtypes, see the {@link Ext.Component} header. Example usage:
     * <pre><code>
var t = new Ext.form.TextField();
var isText = t.isXType('textfield');        // true
var isBoxSubclass = t.isXType('box');       // true, descended from BoxComponent
var isBoxInstance = t.isXType('box', true); // false, not a direct BoxComponent instance
</code></pre>
     * @param {String} xtype The xtype to check for this component
     * @param {Boolean} shallow (optional) False to check whether this component is descended from the xtype (this is
     * the default), or true to check whether this component is directly of the specified xtype.
     */
    isXType : function(xtype, shallow){
        return !shallow ?
               ('/' + this.getXTypes() + '/').indexOf('/' + xtype + '/') != -1 :
                this.constructor.xtype == xtype;
    },

    /**
     * Returns this component's xtype hierarchy as a slash-delimited string. For a list of all
     * available xtypes, see the {@link Ext.Component} header. Example usage:
     * <pre><code>
var t = new Ext.form.TextField();
alert(t.getXTypes());  // alerts 'component/box/field/textfield'
</pre></code>
     * @return {String} The xtype hierarchy string
     */
    getXTypes : function(){
        var tc = this.constructor;
        if(!tc.xtypes){
            var c = [], sc = this;
            while(sc && sc.constructor.xtype){
                c.unshift(sc.constructor.xtype);
                sc = sc.constructor.superclass;
            }
            tc.xtypeChain = c;
            tc.xtypes = c.join('/');
        }
        return tc.xtypes;
    }
});

Ext.reg('component', Ext.Component);