/**
 * @class Ext.layout.AccordionLayout
 * @extends Ext.layout.FitLayout
 *

This is a layout that contains multiple panels in an expandable accordion style such that only
 *
one panel can be open at any given time.  Each panel has built-in support for expanding and collapsing.
 *

This class is intended to be extended or created via the {@link Ext.Container#layout layout}
 * configuration property.  See
{@link Ext.Container#layout} for additional details.


 *

Example usage:


 *

var accordion = new Ext.Panel({
    title: 'Accordion Layout',
    layout:'accordion',
    defaults: {
        // applied to each contained panel
        bodyStyle: 'padding:15px'
    },
    layoutConfig: {
        // layout-specific configs go here
        titleCollapse: false,
        animate: true,
        activeOnTop: true
    },
    items: [{
        title: 'Panel 1',
        html: '<p>Panel content!</p>'
    },{
        title: 'Panel 2',
        html: '<p>Panel content!</p>'
    },{
        title: 'Panel 3',
        html: '<p>Panel content!</p>'
    }]
});

 */

Ext.layout.AccordionLayout = Ext.extend(Ext.layout.FitLayout, {
   
/**
     * @cfg {Boolean} fill
     * True to adjust the active item's height to fill the available space in the container, false to use the
     * item's current height, or auto height if not explicitly set (defaults to true).
     */

    fill
: true,
   
/**
     * @cfg {Boolean} autoWidth
     * True to set each contained item's width to 'auto', false to use the item's current width (defaults to true).
     * Note that some components, in particular the {@link Ext.grid.GridPanel grid}, will not function properly within
     * layouts if they have auto width, so in such cases this config should be set to false.
     */

    autoWidth
: true,
   
/**
     * @cfg {Boolean} titleCollapse
     * True to allow expand/collapse of each contained panel by clicking anywhere on the title bar, false to allow
     * expand/collapse only when the toggle tool button is clicked (defaults to true).  When set to false,
     * {@link #hideCollapseTool} should be false also.
     */

    titleCollapse
: true,
   
/**
     * @cfg {Boolean} hideCollapseTool
     * True to hide the contained panels' collapse/expand toggle buttons, false to display them (defaults to false).
     * When set to true, {@link #titleCollapse} should be true also.
     */

    hideCollapseTool
: false,
   
/**
     * @cfg {Boolean} collapseFirst
     * True to make sure the collapse/expand toggle button always renders first (to the left of) any other tools
     * in the contained panels' title bars, false to render it last (defaults to false).
     */

    collapseFirst
: false,
   
/**
     * @cfg {Boolean} animate
     * True to slide the contained panels open and closed during expand/collapse using animation, false to open and
     * close directly with no animation (defaults to false).  Note: to defer to the specific config setting of each
     * contained panel for this property, set this to undefined at the layout level.
     */

    animate
: false,
   
/**
     * @cfg {Boolean} sequence
     *
Experimental. If animate is set to true, this will result in each animation running in sequence.
     */

    sequence
: false,
   
/**
     * @cfg {Boolean} activeOnTop
     * True to swap the position of each panel as it is expanded so that it becomes the first item in the container,
     * false to keep the panels in the rendered order.
This is NOT compatible with "animate:true" (defaults to false).
     */

    activeOnTop
: false,

    renderItem
: function(c){
       
if(this.animate === false){
            c
.animCollapse = false;
       
}
        c
.collapsible = true;
       
if(this.autoWidth){
            c
.autoWidth = true;
       
}
       
if(this.titleCollapse){
            c
.titleCollapse = true;
       
}
       
if(this.hideCollapseTool){
            c
.hideCollapseTool = true;
       
}
       
if(this.collapseFirst !== undefined){
            c
.collapseFirst = this.collapseFirst;
       
}
       
if(!this.activeItem && !c.collapsed){
           
this.activeItem = c;
       
}else if(this.activeItem && this.activeItem != c){
            c
.collapsed = true;
       
}
       
Ext.layout.AccordionLayout.superclass.renderItem.apply(this, arguments);
        c
.header.addClass('x-accordion-hd');
        c
.on('beforeexpand', this.beforeExpand, this);
   
},

   
// private
    beforeExpand
: function(p, anim){
       
var ai = this.activeItem;
       
if(ai){
           
if(this.sequence){
               
delete this.activeItem;
               
if (!ai.collapsed){
                    ai
.collapse({callback:function(){
                        p
.expand(anim || true);
                   
}, scope: this});
                   
return false;
               
}
           
}else{
                ai
.collapse(this.animate);
           
}
       
}
       
this.activeItem = p;
       
if(this.activeOnTop){
            p
.el.dom.parentNode.insertBefore(p.el.dom, p.el.dom.parentNode.firstChild);
       
}
       
this.layout();
   
},

   
// private
    setItemSize
: function(item, size){
       
if(this.fill && item){
           
var hh = 0;
           
this.container.items.each(function(p){
               
if(p != item){
                    hh
+= p.header.getHeight();
               
}    
           
});
            size
.height -= hh;
            item
.setSize(size);
       
}
   
},

   
/**
     * Sets the active (expanded) item in the layout.
     * @param {String/Number} item The string component id or numeric index of the item to activate
     */

    setActiveItem
: function(item){
        item
= this.container.getComponent(item);
       
if(this.activeItem != item){
           
if(item.rendered && item.collapsed){
                item
.expand();
           
}else{
               
this.activeItem = item;
           
}
       
}

   
}
});
Ext.Container.LAYOUTS.accordion = Ext.layout.AccordionLayout;

//backwards compat
Ext.layout.Accordion = Ext.layout.AccordionLayout;