    /**
     * @class YAHOO.ext.ContentPanel
     * @extends YAHOO.ext.util.Observable
     * A basic ContentPanel element.
     * @constructor
     * Create a new ContentPanel.
     * @param {String/HTMLElement/Element} el The container element for this panel
     * @param {String/Object} config A string to set only the title or a config object
     * @param {String} content (optional) Set the HTML content for this panel
     */
    YAHOO.ext.ContentPanel = function(el, config, content){
        YAHOO.ext.ContentPanel.superclass.constructor.call(this);
        this.el = getEl(el, true);
        if(!this.el && config && config.autoCreate){
            if(typeof config.autoCreate == 'object'){
                if(!config.autoCreate.id){
                    config.autoCreate.id = el;
                }
                this.el = YAHOO.ext.DomHelper.append(document.body,
                            config.autoCreate, true);
            }else{
                this.el = YAHOO.ext.DomHelper.append(document.body,
                            {tag: 'div', cls: 'ylayout-inactive-content', id: el}, true);
            }
        }
        this.closable = false;
        this.loaded = false;
        this.active = false;
        if(typeof config == 'string'){
            this.title = config;
        }else{
            YAHOO.ext.util.Config.apply(this, config);
        }
        if(this.resizeEl){
            this.resizeEl = getEl(this.resizeEl, true);
        }else{
            this.resizeEl = this.el;
        }
        this.events = {
            /**
             * @event activate
             * Fires when this panel is activated.
             * @param {YAHOO.ext.ContentPanel} this
             */
            'activate' : new YAHOO.util.CustomEvent('activate'),
            /**
             * @event deactivate
             * Fires when this panel is activated.
             * @param {YAHOO.ext.ContentPanel} this
             */
            'deactivate' : new YAHOO.util.CustomEvent('deactivate')
        };
        if(content){
            this.setContent(content);
        }
    };

    YAHOO.extendX(YAHOO.ext.ContentPanel, YAHOO.ext.util.Observable, {
        setRegion : function(region){
            this.region = region;
            if(region){
               this.el.replaceClass('ylayout-inactive-content', 'ylayout-active-content');
            }else{
               this.el.replaceClass('ylayout-active-content', 'ylayout-inactive-content');
            }
        },

        /**
         * Returns the toolbar for this Panel if one was configured
         * @return {YAHOO.ext.Toolbar}
         */
        getToolbar : function(){
            return this.toolbar;
        },

        setActiveState : function(active){
            this.active = active;
            if(!active){
                this.fireEvent('deactivate', this);
            }else{
                this.fireEvent('activate', this);
            }
        },

        /**
         * Updates this panel's element
         * @param {String} content The new content
         * @param {<i>Boolean</i>} loadScripts (optional) true to look for and process scripts
        */
        setContent : function(content, loadScripts){
            this.el.update(content, loadScripts);
        },

        /**
         * Get the {@link YAHOO.ext.UpdateManager} for this panel. Enables you to perform Ajax updates.
         * @return {YAHOO.ext.UpdateManager} The UpdateManager
         */
        getUpdateManager : function(){
            return this.el.getUpdateManager();
        },

        /**
         * Set a URL to be used to load the content for this panel.
         * @param {String/Function} url The url to load the content from or a function to call to get the url
         * @param {<i>String/Object</i>} params (optional) The string params for the update call or an object of the params. See {@link YAHOO.ext.UpdateManager#update} for more details. (Defaults to null)
         * @param {<i>Boolean</i>} loadOnce (optional) Whether to only load the content once. If this is false it makes the Ajax call every time this panel is activated. (Defaults to false)
         * @return {YAHOO.ext.UpdateManager} The UpdateManager
         */
        setUrl : function(url, params, loadOnce){
            if(this.refreshDelegate){
                this.removeListener('activate', this.refreshDelegate);
            }
            this.refreshDelegate = this._handleRefresh.createDelegate(this, [url, params, loadOnce]);
            this.on('activate', this._handleRefresh.createDelegate(this, [url, params, loadOnce]));
            return this.el.getUpdateManager();
        },

        _handleRefresh : function(url, params, loadOnce){
            if(!loadOnce || !this.loaded){
                var updater = this.el.getUpdateManager();
                updater.update(url, params, this._setLoaded.createDelegate(this));
            }
        },

        _setLoaded : function(){
            this.loaded = true;
        },

        /**
         * Returns this panel's id
         * @return {String}
         */
        getId : function(){
            return this.el.id;
        },

        /**
         * Returns this panel's element
         * @return {YAHOO.ext.Element}
         */
        getEl : function(){
            return this.el;
        },

        adjustForComponents : function(width, height){
            if(this.toolbar){
                height -= this.toolbar.getEl().getHeight();
            }
            return {'width': width, 'height': height};
        },

        setSize : function(width, height){
            if(this.fitToFrame){
                var size = this.adjustForComponents(width, height);
                this.resizeEl.setSize(size.width, size.height);
            }
        },

        /**
         * Returns this panel's title
         * @return {String}
         */
        getTitle : function(){
            return this.title;
        },

        /**
         * Set this panel's title
         * @param {String} title
         */
        setTitle : function(title){
            this.title = title;
            if(this.region){
                this.region.updatePanelTitle(this, title);
            }
        },

        /**
         * Returns true is this panel was configured to be closable
         * @return {Boolean}
         */
        isClosable : function(){
            return this.closable;
        },

        beforeSlide : function(){
            this.el.clip();
            this.resizeEl.clip();
        },

        afterSlide : function(){
            this.el.unclip();
            this.resizeEl.unclip();
        },

        /**
         * Destroys this panel
         */
        destroy : function(){
            this.el.removeAllListeners();
            var tempEl = document.createElement('span');
            tempEl.appendChild(this.el.dom);
            tempEl.innerHTML = '';
            this.el = null;
        }
    });

    /**
     * @class YAHOO.ext.GridPanel
     * @extends YAHOO.ext.ContentPanel
     * @constructor
     * Create a new GridPanel.
     * @param {YAHOO.ext.grid.Grid} grid The grid for this panel
     * @param {String/Object} config A string to set only the title or a config object
     */
    YAHOO.ext.GridPanel = function(grid, config){
        this.wrapper = YAHOO.ext.DomHelper.append(document.body, // wrapper for IE7 strict & safari scroll issue
            {tag: 'div', cls: 'ylayout-grid-wrapper ylayout-inactive-content'}, true);
        this.wrapper.dom.appendChild(grid.container.dom);
        YAHOO.ext.GridPanel.superclass.constructor.call(this, this.wrapper, config);
        if(this.toolbar){
            this.toolbar.el.insertBefore(this.wrapper.dom.firstChild);
        }
        grid.monitorWindowResize = false; // turn off autosizing
        grid.autoHeight = false;
        grid.autoWidth = false;
        this.grid = grid;
        this.grid.container.replaceClass('ylayout-inactive-content', 'ylayout-component-panel');
    };

    YAHOO.extendX(YAHOO.ext.GridPanel, YAHOO.ext.ContentPanel, {
        getId : function(){
            return this.grid.id;
        },

        /**
         * Returns the grid for this panel
         * @return {YAHOO.ext.grid.Grid}
         */
        getGrid : function(){
            return this.grid;
        },

        setSize : function(width, height){
            var grid = this.grid;
            var size = this.adjustForComponents(width, height);
            grid.container.setSize(size.width, size.height);
            grid.autoSize();
        },

        beforeSlide : function(){
            this.grid.getView().wrapEl.clip();
        },

        afterSlide : function(){
            this.grid.getView().wrapEl.unclip();
        },

        destroy : function(){
            this.grid.getView().unplugDataModel(this.grid.getDataModel());
            this.grid.container.removeAllListeners();
            YAHOO.ext.GridPanel.superclass.destroy.call(this);
        }
    });

    /**
     * @class YAHOO.ext.NestedLayoutPanel
     * @extends YAHOO.ext.ContentPanel
     * @constructor
     * Create a new NestedLayoutPanel.
     * @param {YAHOO.ext.BorderLayout} layout The layout for this panel
     * @param {String/Object} config A string to set only the title or a config object
     */
    YAHOO.ext.NestedLayoutPanel = function(layout, config){
        YAHOO.ext.NestedLayoutPanel.superclass.constructor.call(this, layout.getEl(), config);
        layout.monitorWindowResize = false; // turn off autosizing
        this.layout = layout;
        this.layout.getEl().addClass('ylayout-nested-layout');
    };

    YAHOO.extendX(YAHOO.ext.NestedLayoutPanel, YAHOO.ext.ContentPanel, {
        setSize : function(width, height){
            var size = this.adjustForComponents(width, height);
            this.layout.getEl().setSize(size.width, size.height);
            this.layout.layout();
        },

        /**
         * Returns the nested BorderLayout for this panel
         * @return {YAHOO.ext.BorderLayout}
         */
        getLayout : function(){
            return this.layout;
        }
    });

Copyright © 2006 Jack Slocum. All rights reserved.