/**
 * @class Ext.layout.FormLayout
 * @extends Ext.layout.AnchorLayout
 * 
This layout manager is specifically designed for rendering and managing child Components of
 * {@link Ext.form.FormPanel forms}. It is responsible for rendering the labels of
 * {@link Ext.form.Field Field}s.

 *
 * 
This layout manager is used when a Container is configured with the layout:'form'
 * {@link Ext.Container#layout layout} config option, and should generally not need to be created directly
 * via the new keyword. See {@link Ext.Container#layout} for additional details.

 *
 * 
In an application, it will usually be preferrable to use a {@link Ext.form.FormPanel FormPanel}
 * (which is configured with FormLayout as its layout class by default) since it also provides built-in
 * functionality for {@link Ext.form.BasicForm#doAction loading, validating and submitting} the form.

 *
 * 
A {@link Ext.Container Container} using the FormLayout layout manager (e.g.
 * {@link Ext.form.FormPanel} or specifying layout:'form') can also accept the following
 * layout-specific config properties:

 *
 * 
Any Component (including Fields) managed by FormLayout accepts the following as a config option:
 * 

 *
 * 
Any Component managed by FormLayout may be rendered as a form field (with an associated label) by
 * configuring it with a non-null {@link Ext.Component#fieldLabel fieldLabel}. Components configured
 * in this way may be configured with the following options which affect the way the FormLayout renders them:
 * 

 *
 * 
Example usage:

 * 

// Required if showing validation messages
Ext.QuickTips.init();

// While you can create a basic Panel with layout:'form', practically
// you should usually use a FormPanel to also get its form functionality
// since it already creates a FormLayout internally.
var form = new Ext.form.FormPanel({
    title: 'Form Layout',
    bodyStyle: 'padding:15px',
    width: 350,
    defaultType: 'textfield',
    defaults: {
        // applied to each contained item
        width: 230,
        msgTarget: 'side'
    },
    items: [{
            fieldLabel: 'First Name',
            name: 'first',
            allowBlank: false,
            {@link Ext.Component#labelSeparator labelSeparator}: ':' // override labelSeparator layout config
        },{
            fieldLabel: 'Last Name',
            name: 'last'
        },{
            fieldLabel: 'Email',
            name: 'email',
            vtype:'email'
        }, {
            xtype: 'textarea',
            hideLabel: true,     // override hideLabels layout config
            name: 'msg',
            anchor: '100% -53'
        }
    ],
    buttons: [
        {text: 'Save'},
        {text: 'Cancel'}
    ],
    layoutConfig: {
        {@link #labelSeparator}: '~' // superseded by assignment below
    },
    // config options applicable to container when layout='form':
    hideLabels: false,
    labelAlign: 'left',   // or 'right' or 'top'
    {@link Ext.form.FormPanel#labelSeparator labelSeparator}: '>>', // takes precedence over layoutConfig value
    labelWidth: 65,       // defaults to 100
    labelPad: 8           // defaults to 5, must specify labelWidth to be honored
});


 */
Ext.layout.FormLayout = Ext.extend(Ext.layout.AnchorLayout, {

    
/**
     * @cfg {String} labelSeparator
     * See {@link Ext.form.FormPanel}.{@link Ext.form.FormPanel#labelSeparator labelSeparator}.  Configuration
     * of this property at the container level takes precedence.
     */
    labelSeparator : ':',

    
/**
     * Read only. The CSS style specification string added to field labels in this layout if not
     * otherwise {@link Ext.Component#labelStyle specified by each contained field}.
     * @type String
     * @property labelStyle
     */

    // private
    setContainer : function(ct){
        Ext.layout.FormLayout.superclass.setContainer.call(this, ct);
        if(ct.labelAlign){
            ct.addClass('x-form-label-'+ct.labelAlign);
        }

        if(ct.hideLabels){
            this.labelStyle = "display:none";
            this.elementStyle = "padding-left:0;";
            this.labelAdjust = 0;
        }else{
            this.labelSeparator = ct.labelSeparator || this.labelSeparator;
            ct.labelWidth = ct.labelWidth || 100;
            if(typeof ct.labelWidth == 'number'){
                var pad = (typeof ct.labelPad == 'number' ? ct.labelPad : 5);
                this.labelAdjust = ct.labelWidth+pad;
                this.labelStyle = "width:"+ct.labelWidth+"px;";
                this.elementStyle = "padding-left:"+(ct.labelWidth+pad)+'px';
            }
            if(ct.labelAlign == 'top'){
                this.labelStyle = "width:auto;";
                this.labelAdjust = 0;
                this.elementStyle = "padding-left:0;";
            }
        }
    },

    //private
    getLabelStyle: function(s){
        var ls = '', items = [this.labelStyle, s];
        for (var i = 0, len = items.length; i < len; ++i){
            if (items[i]){
                ls += items[i];
                if (ls.substr(-1, 1) != ';'){
                    ls += ';'
                }
            }
        }
        return ls;
    },

    
/**
     * @cfg {Ext.Template} fieldTpl
     * A {@link Ext.Template#compile compile}d {@link Ext.Template} for rendering
     * the fully wrapped, labeled and styled form Field. Defaults to:

new Ext.Template(
    '<div class="x-form-item {itemCls}" tabIndex="-1">',
        '<label for="{id}" style="{labelStyle}" class="x-form-item-label">{label}{labelSeparator}</label>',
        '<div class="x-form-element" id="x-form-el-{id}" style="{elementStyle}">',
        '</div><div class="{clearCls}"></div>',
    '</div>'
);


     * 
This may be specified to produce a different DOM structure when rendering form Fields.

     * 
A description of the properties within the template follows:

     * 
Also see {@link #getTemplateArgs}

     */

    // private
    renderItem : function(c, position, target){
        if(c && !c.rendered && (c.isFormField || c.fieldLabel) && c.inputType != 'hidden'){
            var args = this.getTemplateArgs(c);
            if(typeof position == 'number'){
                position = target.dom.childNodes[position] || null;
            }
            if(position){
                this.fieldTpl.insertBefore(position, args);
            }else{
                this.fieldTpl.append(target, args);
            }
            c.render('x-form-el-'+c.id);
        }else {
            Ext.layout.FormLayout.superclass.renderItem.apply(this, arguments);
        }
    },

    
/**
     * 
Provides template arguments for rendering the fully wrapped, labeled and styled form Field.

     * 
This method returns an object hash containing properties used by the layout's {@link #fieldTpl}
     * to create a correctly wrapped, labeled and styled form Field. This may be overriden to
     * create custom layouts. The properties which must be returned are:

     * @param field The {@link Field Ext.form.Field} being rendered.
     * @return An object hash containing the properties required to render the Field.
     */
    getTemplateArgs: function(field) {
        var noLabelSep = !field.fieldLabel || field.hideLabel;
        return {
            id: field.id,
            label: field.fieldLabel,
            labelStyle: field.labelStyle||this.labelStyle||'',
            elementStyle: this.elementStyle||'',
            labelSeparator: noLabelSep ? '' : (typeof field.labelSeparator == 'undefined' ? this.labelSeparator : field.labelSeparator),
            itemCls: (field.itemCls||this.container.itemCls||'') + (field.hideLabel ? ' x-hide-label' : ''),
            clearCls: field.clearCls || 'x-form-clear-left'
        };
    },

    // private
    adjustWidthAnchor : function(value, comp){
        return value - (comp.isFormField || comp.fieldLabel  ? (comp.hideLabel ? 0 : this.labelAdjust) : 0);
    },

    // private
    isValidParent : function(c, target){
        return true;
    }

    
/**
     * @property activeItem
     * @hide
     */
});

Ext.Container.LAYOUTS['form'] = Ext.layout.FormLayout;