/**
 * @class Ext.form.RadioGroup
 * @extends Ext.form.CheckboxGroup
 * A grouping container for {@link Ext.form.Radio} controls.
 * @constructor
 * Creates a new RadioGroup
 * @param {Object} config Configuration options
 * @xtype radiogroup
 */
Ext.form.RadioGroup = Ext.extend(Ext.form.CheckboxGroup, {
    
/**
     * @cfg {Boolean} allowBlank True to allow every item in the group to be blank (defaults to true).
     * If allowBlank = false and no items are selected at validation time, {@link @blankText} will
     * be used as the error text.
     */
    allowBlank : true,
    
/**
     * @cfg {String} blankText Error text to display if the {@link #allowBlank} validation fails
     * (defaults to 'You must select one item in this group')
     */
    blankText : 'You must select one item in this group',
    
    // private
    defaultType : 'radio',
    
    // private
    groupCls : 'x-form-radio-group',
    
    
/**
     * @event change
     * Fires when the state of a child radio changes.
     * @param {Ext.form.RadioGroup} this
     * @param {Ext.form.Radio} checked The checked radio
     */
    
    
/**
     * Gets the selected {@link Ext.form.Radio} in the group, if it exists.
     * @return {Ext.form.Radio} The selected radio.
     */
    getValue : function(){
        var out = null;
        this.eachItem(function(item){
            if(item.checked){
                out = item;
                return false;
            }
        });
        return out;
    },
    
    
/**
     * Sets the checked radio in the group.
     * @param {String/Ext.form.Radio} id The radio to check.
     * @param {Boolean} value The value to set the radio.
     * @return {Ext.form.RadioGroup} this
     */
    setValue : function(id, value){
        if(this.rendered){
            if(arguments.length > 1){
                var f = this.getBox(id);
                if(f){
                    f.setValue(value);
                    if(f.checked){
                        this.eachItem(function(item){
                            if (item !== f){
                                item.setValue(false);
                            }
                        });
                    }
                }
            }else{
                this.setValueForItem(id);
            }
        }else{
            this.values = arguments;
        }
        return this;
    },
    
    // private
    fireChecked : function(){
        if(!this.checkTask){
            this.checkTask = new Ext.util.DelayedTask(this.bufferChecked, this);
        }
        this.checkTask.delay(10);
    },
    
    // private
    bufferChecked : function(){
        var out = null;
        this.eachItem(function(item){
            if(item.checked){
                out = item;
                return false;
            }
        });
        this.fireEvent('change', this, out);
    },
    
    onDestroy : function(){
        if(this.checkTask){
            this.checkTask.cancel();
            this.checkTask = null;
        }
        Ext.form.RadioGroup.superclass.onDestroy.call(this);
    }

});

Ext.reg('radiogroup', Ext.form.RadioGroup);