    /**
     * 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.
     *
     * # Validation
     *
     * 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 `{@link #allowBlank}:false`; 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.
     *
     * # Layout
     *
     * 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.
     *
     *     @example
     *     Ext.create('Ext.form.Panel', {
     *         title: 'Checkbox Group',
     *         width: 300,
     *         height: 125,
     *         bodyPadding: 10,
     *         renderTo: Ext.getBody(),
     *         items:[{
     *             xtype: 'checkboxgroup',
     *             fieldLabel: 'Two Columns',
     *             // Arrange checkboxes 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' }
     *             ]
     *         }]
     *     });
     */
    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
         * @private
         */

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

        /**
         * @cfg {String/Number/Number[]} 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:
         *
         * - 'auto' - 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.
         * - Number - 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}.
         * - Array - 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.
         */
        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. If no items are selected at
         * validation time, {@link #blankText} will be used as the error text.
         */
        allowBlank : true,

        //<locale>
        /**
         * @cfg {String} blankText
         * Error text to display if the {@link #allowBlank} validation fails
         */
        blankText : "You must select at least one item in this group",
        //</locale>

        // private
        defaultType : 'checkboxfield',

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

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

        // private
        layout: 'checkboxgroup',

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

        /**
         * 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.
         * @protected
         */
        initValue: function() {
            var me = this,
                valueCfg = me.value;
            me.originalValue = me.lastValue = valueCfg || me.getValue();
            if (valueCfg) {
                me.setValue(valueCfg);
            }
        },

        /**
         * When a checkbox is added to the group, monitor it for changes
         * @param {Object} field
         * @protected
         */
        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 {String[]} 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
         * @param {String} [query] An additional query to add to the selector.
         */
        getBoxes: function(query) {
            return this.query('[isCheckbox]' + (query||''));
        },

        /**
         * @private Convenience function which calls the given function for every checkbox in the group
         * @param {Function} fn The function to call
         * @param {Object} [scope] 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 {Ext.form.field.Checkbox[]} Array of Ext.form.field.Checkbox components
         */
        getChecked: function() {
            return this.getBoxes('[checked]');
        },

        // private override
        isDirty: function(){
            var boxes = this.getBoxes(),
                b ,
                bLen  = boxes.length;

            for (b = 0; b < bLen; b++) {
                if (boxes[b].isDirty()) {
                    return true;
                }
            }
        },

        // private override
        setReadOnly: function(readOnly) {
            var boxes = this.getBoxes(),
                b,
                bLen  = boxes.length;

            for (b = 0; b < bLen; b++) {
                boxes[b].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() {
                var boxes = me.getBoxes(),
                    b,
                    bLen  = boxes.length;

                for (b = 0; b < bLen; b++) {
                    boxes[b].reset();
                }
            });
            me.preventMark = preventMark;
            me.unsetActiveError();
            if (hadError) {
                me.updateLayout();
            }
        },

        resetOriginalValue: function(){
            var me    = this,
                boxes = me.getBoxes(),
                b,
                bLen  = boxes.length;

            for (b = 0; b < bLen; b++) {
                boxes[b].resetOriginalValue();
            }

            me.originalValue = me.getValue();
            me.checkDirty();
        },

        /**
         * 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:
         *
         *   - A single Boolean or String value will be passed to the `setValue` method of the checkbox with that name.
         *     See the rules in {@link Ext.form.field.Checkbox#setValue} for accepted values.
         *   - 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.
         *
         * If a checkbox's name is not in the mapping at all, it will be unchecked.
         *
         * An example:
         *
         *     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']
         *     });
         *
         * 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.
         *
         * @param {Object} value The mapping of checkbox names to values.
         * @return {Ext.form.CheckboxGroup} this
         */
        setValue: function(value) {
            var me    = this,
                boxes = me.getBoxes(),
                b,
                bLen  = boxes.length,
                box, name,
                cbValue;

            me.batchChanges(function() {
                for (b = 0; b < bLen; b++) {
                    box = boxes[b];
                    name = box.getName();
                    cbValue = false;

                    if (value && value.hasOwnProperty(name)) {
                        if (Ext.isArray(value[name])) {
                            cbValue = Ext.Array.contains(value[name], box.inputValue);
                        } else {
                            // single value, let the checkbox's own setValue handle conversion
                            cbValue = value[name];
                        }
                    }

                    box.setValue(cbValue);
                }
            });
            return me;
        },

        /**
         * 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.
         *
         * The object format returned from this method can also be passed directly to the {@link #setValue} method.
         *
         * 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.
         */
        getValue: function() {
            var values = {},
                boxes  = this.getBoxes(),
                b,
                bLen   = boxes.length,
                box, name, inputValue, bucket;

            for (b = 0; b < bLen; b++) {
                box        = boxes[b];
                name       = box.getName();
                inputValue = box.inputValue;

                if (box.getValue()) {
                    if (values.hasOwnProperty(name)) {
                        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,
                isValid,
                wasValid;

            if (me.disabled) {
                isValid = true;
            } else {
                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.updateLayout();
            }

            return isValid;
        }

    }, function() {

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

    });