    /**
     * @class Ext.form.CheckboxGroup
     * @extends Ext.form.FieldContainer
     * <p>A {@link Ext.form.FieldContainer field container} which has a specialized layout for arranging
     * {@link Ext.form.field.Checkbox} controls into columns, and provides convenience {@link Ext.form.field.Field} methods
     * for {@link #getValue getting}, {@link #setValue setting}, and {@link #validate validating} the group
     * of checkboxes as a whole.</p>
     * <p><b>Validation:</b> Individual checkbox fields themselves have no default validation behavior, but
     * sometimes you want to require a user to select at least one of a group of checkboxes. CheckboxGroup
     * allows this by setting the config <tt>{@link #allowBlank}:false</tt>; when the user does not check at
     * least one of the checkboxes, the entire group will be highlighted as invalid and the
     * {@link #blankText error message} will be displayed according to the {@link #msgTarget} config.</p>
     * <p><b>Layout:</b> The default layout for CheckboxGroup makes it easy to arrange the checkboxes into
     * columns; see the {@link #columns} and {@link #vertical} config documentation for details. You may also
     * use a completely different layout by setting the {@link #layout} to one of the other supported layout
     * types; for instance you may wish to use a custom arrangement of hbox and vbox containers. In that case
     * the checkbox components at any depth will still be managed by the CheckboxGroup's validation.</p>
     * {@img Ext.form.RadioGroup/Ext.form.RadioGroup.png Ext.form.RadioGroup component}
     * <p>Example usage:</p>
     * <pre><code>
    Ext.create('Ext.form.Panel', {
        title: 'RadioGroup Example',
        width: 300,
        height: 125,
        bodyPadding: 10,
        renderTo: Ext.getBody(),
        items:[{
            xtype: 'radiogroup',
            fieldLabel: 'Two Columns',
            // Arrange radio buttons into two columns, distributed vertically
            columns: 2,
            vertical: true,
            items: [
                {boxLabel: 'Item 1', name: 'rb', inputValue: '1'},
                {boxLabel: 'Item 2', name: 'rb', inputValue: '2', checked: true},
                {boxLabel: 'Item 3', name: 'rb', inputValue: '3'},
                {boxLabel: 'Item 4', name: 'rb', inputValue: '4'},
                {boxLabel: 'Item 5', name: 'rb', inputValue: '5'},
                {boxLabel: 'Item 6', name: 'rb', inputValue: '6'}
            ]
        }]
    });
     * </code></pre>
     * @constructor
     * Creates a new CheckboxGroup
     * @param {Object} config Configuration options
     * @xtype checkboxgroup
     */
    Ext.define('Ext.form.CheckboxGroup', {
        extend:'Ext.form.FieldContainer',
        mixins: {
            field: 'Ext.form.field.Field'
        },
        alias: 'widget.checkboxgroup',
        requires: ['Ext.layout.container.CheckboxGroup', 'Ext.form.field.Base'],

        /**
         * @cfg {String} name
         * @hide
         */

        /**
         * @cfg {Array} items An Array of {@link Ext.form.field.Checkbox Checkbox}es or Checkbox config objects
         * to arrange in the group.
         */

        /**
         * @cfg {String/Number/Array} columns Specifies the number of columns to use when displaying grouped
         * checkbox/radio controls using automatic layout.  This config can take several types of values:
         * <ul><li><b>'auto'</b> : <p class="sub-desc">The controls will be rendered one per column on one row and the width
         * of each column will be evenly distributed based on the width of the overall field container. This is the default.</p></li>
         * <li><b>Number</b> : <p class="sub-desc">If you specific a number (e.g., 3) that number of columns will be
         * created and the contained controls will be automatically distributed based on the value of {@link #vertical}.</p></li>
         * <li><b>Array</b> : <p class="sub-desc">You can also specify an array of column widths, mixing integer
         * (fixed width) and float (percentage width) values as needed (e.g., [100, .25, .75]). Any integer values will
         * be rendered first, then any float values will be calculated as a percentage of the remaining space. Float
         * values do not have to add up to 1 (100%) although if you want the controls to take up the entire field
         * container you should do so.</p></li></ul>
         */
        columns : 'auto',

        /**
         * @cfg {Boolean} vertical True to distribute contained controls across columns, completely filling each column
         * top to bottom before starting on the next column.  The number of controls in each column will be automatically
         * calculated to keep columns as even as possible.  The default value is false, so that controls will be added
         * to columns one at a time, completely filling each row left to right before starting on the next row.
         */
        vertical : false,

        /**
         * @cfg {Boolean} allowBlank False to validate that at least one item in the group is checked (defaults to true).
         * If 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 at least one item in this group")
         */
        blankText : "You must select at least one item in this group",

        // private
        defaultType : 'checkboxfield',

        // private
        groupCls : Ext.baseCSSPrefix + 'form-check-group',

        /**
         * @cfg {String} fieldBodyCls
         * An extra CSS class to be applied to the body content element in addition to {@link #baseBodyCls}.
         * Defaults to 'x-form-checkboxgroup-body'.
         */
        fieldBodyCls: Ext.baseCSSPrefix + 'form-checkboxgroup-body',

        // private
        layout: 'checkboxgroup',

        initComponent: function() {
            var me = this;
            me.callParent();
            me.initField();
        },

        /**
         * @protected
         * Initializes the field's value based on the initial config. If the {@link #value} config is specified
         * then we use that to set the value; otherwise we initialize the originalValue by querying the values of
         * all sub-checkboxes after they have been initialized.
         */
        initValue: function() {
            var me = this,
                valueCfg = me.value;
            me.originalValue = me.lastValue = valueCfg || me.getValue();
            if (valueCfg) {
                me.setValue(valueCfg);
            }
        },

        /**
         * @protected
         * When a checkbox is added to the group, monitor it for changes
         */
        onFieldAdded: function(field) {
            var me = this;
            if (field.isCheckbox) {
                me.mon(field, 'change', me.checkChange, me);
            }
            me.callParent(arguments);
        },

        onFieldRemoved: function(field) {
            var me = this;
            if (field.isCheckbox) {
                me.mun(field, 'change', me.checkChange, me);
            }
            me.callParent(arguments);
        },

        // private override - the group value is a complex object, compare using object serialization
        isEqual: function(value1, value2) {
            var toQueryString = Ext.Object.toQueryString;
            return toQueryString(value1) === toQueryString(value2);
        },

        /**
         * Runs CheckboxGroup's validations and returns an array of any errors. The only error by default
         * is if allowBlank is set to true and no items are checked.
         * @return {Array} Array of all validation errors
         */
        getErrors: function() {
            var errors = [];
            if (!this.allowBlank && Ext.isEmpty(this.getChecked())) {
                errors.push(this.blankText);
            }
            return errors;
        },

        /**
         * @private Returns all checkbox components within the container
         */
        getBoxes: function() {
            return this.query('[isCheckbox]');
        },

        /**
         * @private Convenience function which calls the given function for every checkbox in the group
         * @param {Function} fn The function to call
         * @param {Object} scope Optional scope object
         */
        eachBox: function(fn, scope) {
            Ext.Array.forEach(this.getBoxes(), fn, scope || this);
        },

        /**
         * Returns an Array of all checkboxes in the container which are currently checked
         * @return {Array} Array of Ext.form.field.Checkbox components
         */
        getChecked: function() {
            return Ext.Array.filter(this.getBoxes(), function(cb) {
                return cb.getValue();
            });
        },

        // private override
        isDirty: function(){
            return Ext.Array.some(this.getBoxes(), function(cb) {
                return cb.isDirty();
            });
        },

        // private override
        setReadOnly: function(readOnly) {
            this.eachBox(function(cb) {
                cb.setReadOnly(readOnly);
            });
            this.readOnly = readOnly;
        },

        /**
         * Resets the checked state of all {@link Ext.form.field.Checkbox checkboxes} in the group to their
         * originally loaded values and clears any validation messages.
         * See {@link Ext.form.Basic}.{@link Ext.form.Basic#trackResetOnLoad trackResetOnLoad}
         */
        reset: function() {
            var me = this,
                hadError = me.hasActiveError(),
                preventMark = me.preventMark;
            me.preventMark = true;
            me.batchChanges(function() {
                me.eachBox(function(cb) {
                    cb.reset();
                });
            });
            me.preventMark = preventMark;
            me.unsetActiveError();
            if (hadError) {
                me.doComponentLayout();
            }
        },

        // private override
        resetOriginalValue: function() {
            // Defer resetting of originalValue until after all sub-checkboxes have been reset so we get
            // the correct data from getValue()
            Ext.defer(function() {
                this.callParent();
            }, 1, this);
        },

        /**
         * <p>Sets the value(s) of all checkboxes in the group. The expected format is an Object of
         * name-value pairs corresponding to the names of the checkboxes in the group. Each pair can
         * have either a single or multiple values:</p>
         * <ul>
         *   <li>A single Boolean or String value will be passed to the <code>setValue</code> method of the
         *   checkbox with that name. See the rules in {@link Ext.form.field.Checkbox#setValue} for accepted values.</li>
         *   <li>An Array of String values will be matched against the {@link Ext.form.field.Checkbox#inputValue inputValue}
         *   of checkboxes in the group with that name; those checkboxes whose inputValue exists in the array will be
         *   checked and others will be unchecked.</li>
         * </ul>
         * <p>If a checkbox's name is not in the mapping at all, it will be unchecked.</p>
         * <p>An example:</p>
         * <pre><code>var myCheckboxGroup = new Ext.form.CheckboxGroup({
        columns: 3,
        items: [{
            name: 'cb1',
            boxLabel: 'Single 1'
        }, {
            name: 'cb2',
            boxLabel: 'Single 2'
        }, {
            name: 'cb3',
            boxLabel: 'Single 3'
        }, {
            name: 'cbGroup',
            boxLabel: 'Grouped 1'
            inputValue: 'value1'
        }, {
            name: 'cbGroup',
            boxLabel: 'Grouped 2'
            inputValue: 'value2'
        }, {
            name: 'cbGroup',
            boxLabel: 'Grouped 3'
            inputValue: 'value3'
        }]
    });

    myCheckboxGroup.setValue({
        cb1: true,
        cb3: false,
        cbGroup: ['value1', 'value3']
    });</code></pre>
         * <p>The above code will cause the checkbox named 'cb1' to be checked, as well as the first and third
         * checkboxes named 'cbGroup'. The other three checkboxes will be unchecked.</p>
         * @param {Object} value The mapping of checkbox names to values.
         * @return {Ext.form.CheckboxGroup} this
         */
        setValue: function(value) {
            var me = this;
            me.batchChanges(function() {
                me.eachBox(function(cb) {
                    var name = cb.getName(),
                        cbValue = false;
                    if (value && name in value) {
                        if (Ext.isArray(value[name])) {
                            cbValue = Ext.Array.contains(value[name], cb.inputValue);
                        } else {
                            // single value, let the checkbox's own setValue handle conversion
                            cbValue = value[name];
                        }
                    }
                    cb.setValue(cbValue);
                });
            });
            return me;
        },

        /**
         * <p>Returns an object containing the values of all checked checkboxes within the group. Each key-value pair
         * in the object corresponds to a checkbox {@link Ext.form.field.Checkbox#name name}. If there is only one checked
         * checkbox with a particular name, the value of that pair will be the String
         * {@link Ext.form.field.Checkbox#inputValue inputValue} of that checkbox. If there are multiple checked checkboxes
         * with that name, the value of that pair will be an Array of the selected inputValues.</p>
         * <p>The object format returned from this method can also be passed directly to the {@link #setValue} method.</p>
         * <p>NOTE: In Ext 3, this method returned an array of Checkbox components; this was changed to make it more
         * consistent with other field components and with the {@link #setValue} argument signature. If you need the old
         * behavior in Ext 4+, use the {@link #getChecked} method instead.</p>
         */
        getValue: function() {
            var values = {};
            this.eachBox(function(cb) {
                var name = cb.getName(),
                    inputValue = cb.inputValue,
                    bucket;
                if (cb.getValue()) {
                    if (name in values) {
                        bucket = values[name];
                        if (!Ext.isArray(bucket)) {
                            bucket = values[name] = [bucket];
                        }
                        bucket.push(inputValue);
                    } else {
                        values[name] = inputValue;
                    }
                }
            });
            return values;
        },

        /*
         * Don't return any data for submit; the form will get the info from the individual checkboxes themselves.
         */
        getSubmitData: function() {
            return null;
        },

        /*
         * Don't return any data for the model; the form will get the info from the individual checkboxes themselves.
         */
        getModelData: function() {
            return null;
        },

        validate: function() {
            var me = this,
                errors = me.getErrors(),
                isValid = Ext.isEmpty(errors),
                wasValid = !me.hasActiveError();

            if (isValid) {
                me.unsetActiveError();
            } else {
                me.setActiveError(errors);
            }
            if (isValid !== wasValid) {
                me.fireEvent('validitychange', me, isValid);
                me.doComponentLayout();
            }

            return isValid;
        }

    }, function() {

        this.borrow(Ext.form.field.Base, ['markInvalid', 'clearInvalid']);

    });