/**
 * @class Ext.layout.ContainerLayout
 * 
The ContainerLayout class is the default layout manager delegated by {@link Ext.Container} to
 * render any child Components when no {@link Ext.Container#layout layout} is configured into
 * a {@link Ext.Container Container}. ContainerLayout provides the basic foundation for all other layout
 * classes in Ext. It simply renders all child Components into the Container, performing no sizing or
 * positioning services. To utilize a layout that provides sizing and positioning of child Components,
 * specify an appropriate {@link Ext.Container#layout layout}.

 * 
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.

 */
Ext.layout.ContainerLayout = Ext.extend(Object, {
    
/**
     * @cfg {String} extraCls
     * 
An optional extra CSS class that will be added to the container. This can be useful for adding
     * customized styles to the container or any of its children using standard CSS rules. See
     * {@link Ext.Component}.{@link Ext.Component#ctCls ctCls} also.

     * 
Note: extraCls defaults to '' except for the following classes
     * which assign a value by default:
     * 

     * To configure the above Classes with an extra CSS class append to the default.  For example,
     * for ColumnLayout:

     * extraCls: 'x-column custom-class'
     * 

     * 

     */
    
/**
     * @cfg {Boolean} renderHidden
     * True to hide each contained item on render (defaults to false).
     */

    
/**
     * A reference to the {@link Ext.Component} that is active.  For example, 

     * if(myPanel.layout.activeItem.id == 'item-1') { ... }
     * 

     * activeItem only applies to layout styles that can display items one at a time
     * (like {@link Ext.layout.AccordionLayout}, {@link Ext.layout.CardLayout}
     * and {@link Ext.layout.FitLayout}).  Read-only.  Related to {@link Ext.Container#activeItem}.
     * @type {Ext.Component}
     * @property activeItem
     */

    // private
    monitorResize:false,
    // private
    activeItem : null,

    constructor : function(config){
        Ext.apply(this, config);
    },

    // private
    layout : function(){
        var target = this.container.getLayoutTarget();
        if(!(this.hasLayout || Ext.isEmpty(this.targetCls))){
            target.addClass(this.targetCls)
        }
        this.onLayout(this.container, target);
        this.container.fireEvent('afterlayout', this.container, this);
        this.hasLayout = true;
    },

    // private
    onLayout : function(ct, target){
        this.renderAll(ct, target);
    },

    // private
    isValidParent : function(c, target){
        return target && c.getPositionEl().dom.parentNode == (target.dom || target);
    },

    // private
    renderAll : function(ct, target){
        var items = ct.items.items;
        for(var i = 0, len = items.length; i < len; i++) {
            var c = items[i];
            if(c && (!c.rendered || !this.isValidParent(c, target))){
                this.renderItem(c, i, target);
            }
        }
    },

    // private
    renderItem : function(c, position, target){
        if(c && !c.rendered){
            c.render(target, position);
            this.configureItem(c, position);
        }else if(c && !this.isValidParent(c, target)){
            if(Ext.isNumber(position)){
                position = target.dom.childNodes[position];
            }
            target.dom.insertBefore(c.getPositionEl().dom, position || null);
            c.container = target;
            this.configureItem(c, position);
        }
    },

    // private
    configureItem: function(c, position){
        if(this.extraCls){
            var t = c.getPositionEl ? c.getPositionEl() : c;
            t.addClass(this.extraCls);
        }
        // If we are forcing a layout, do so *before* we hide so elements have height/width
        if(c.doLayout && this.forceLayout){
            c.doLayout(false, true);
        }
        if (this.renderHidden && c != this.activeItem) {
            c.hide();
        }
    },

    onRemove: function(c){
         if(this.activeItem == c){
            delete this.activeItem;
         }
         if(c.rendered && this.extraCls){
            var t = c.getPositionEl ? c.getPositionEl() : c;
            t.removeClass(this.extraCls);
        }
    },

    // private
    onResize: function(){
        var ct = this.container,
            b = ct.bufferResize;

        if (ct.collapsed){
            return;
        }

        // Not having an ownerCt negates the buffering: floating and top level
        // Containers (Viewport, Window, ToolTip, Menu) need to lay out ASAP.
        if (b && ct.ownerCt) {
            // If we do NOT already have a layout pending from an ancestor, schedule one.
            // If there is a layout pending, we do nothing here.
            // buffering to be deprecated soon
            if (!ct.hasLayoutPending()){
                if(!this.resizeTask){
                    this.resizeTask = new Ext.util.DelayedTask(this.runLayout, this);
                    this.resizeBuffer = Ext.isNumber(b) ? b : 50;
                }
                ct.layoutPending = true;
                this.resizeTask.delay(this.resizeBuffer);
            }
        }else{
            ct.doLayout(false, this.forceLayout);
        }
    },

    // private
    runLayout: function(){
        var ct = this.container;
        ct.doLayout();
        delete ct.layoutPending;
    },

    // private
    setContainer : function(ct){
        // No longer use events to handle resize. Instead this will be handled through a direct function call.
        /*
        if(this.monitorResize && ct != this.container){
            var old = this.container;
            if(old){
                old.un(old.resizeEvent, this.onResize, this);
            }
            if(ct){
                ct.on(ct.resizeEvent, this.onResize, this);
            }
        }
        */
        this.container = ct;
    },

    // private
    parseMargins : function(v){
        if(Ext.isNumber(v)){
            v = v.toString();
        }
        var ms = v.split(' ');
        var len = ms.length;
        if(len == 1){
            ms[1] = ms[0];
            ms[2] = ms[0];
            ms[3] = ms[0];
        }
        if(len == 2){
            ms[2] = ms[0];
            ms[3] = ms[1];
        }
        if(len == 3){
            ms[3] = ms[1];
        }
        return {
            top:parseInt(ms[0], 10) || 0,
            right:parseInt(ms[1], 10) || 0,
            bottom:parseInt(ms[2], 10) || 0,
            left:parseInt(ms[3], 10) || 0
        };
    },

    
/**
     * The {@link Ext.Template Ext.Template} used by Field rendering layout classes (such as
     * {@link Ext.layout.FormLayout}) to create the DOM structure of a fully wrapped,
     * labeled and styled form Field. A default Template is supplied, but this may be
     * overriden to create custom field structures. The template processes values returned from
     * {@link Ext.layout.FormLayout#getTemplateArgs}.
     * @property fieldTpl
     * @type Ext.Template
     */
    fieldTpl: (function() {
        var t = new Ext.Template(
            '
',
                '',
                '
',
                '
',
            '
'
        );
        t.disableFormats = true;
        return t.compile();
    })(),

    /*
     * Destroys this layout. This is a template method that is empty by default, but should be implemented
     * by subclasses that require explicit destruction to purge event handlers or remove DOM nodes.
     * @protected
     */
    destroy : function(){
        if(!Ext.isEmpty(this.targetCls)){
            var target = this.container.getLayoutTarget();
            if(target){
                target.removeClass(this.targetCls);
            }
        }
    }
});
Ext.Container.LAYOUTS['auto'] = Ext.layout.ContainerLayout;