/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * @docauthor Jason Johnston <jason@sencha.com>
 * 
 * FormPanel provides a standard container for forms. It is essentially a standard {@link Ext.panel.Panel} which
 * automatically creates a {@link Ext.form.Basic BasicForm} for managing any {@link Ext.form.field.Field}
 * objects that are added as descendants of the panel. It also includes conveniences for configuring and
 * working with the BasicForm and the collection of Fields.
 * 
 * # Layout
 * 
 * By default, FormPanel is configured with `{@link Ext.layout.container.Anchor layout:'anchor'}` for
 * the layout of its immediate child items. This can be changed to any of the supported container layouts.
 * The layout of sub-containers is configured in {@link Ext.container.Container#layout the standard way}.
 * 
 * # BasicForm
 * 
 * Although **not listed** as configuration options of FormPanel, the FormPanel class accepts all
 * of the config options supported by the {@link Ext.form.Basic} class, and will pass them along to
 * the internal BasicForm when it is created.
 * 
 * The following events fired by the BasicForm will be re-fired by the FormPanel and can therefore be
 * listened for on the FormPanel itself:
 * 
 * - {@link Ext.form.Basic#beforeaction beforeaction}
 * - {@link Ext.form.Basic#actionfailed actionfailed}
 * - {@link Ext.form.Basic#actioncomplete actioncomplete}
 * - {@link Ext.form.Basic#validitychange validitychange}
 * - {@link Ext.form.Basic#dirtychange dirtychange}
 * 
 * # Field Defaults
 * 
 * The {@link #fieldDefaults} config option conveniently allows centralized configuration of default values
 * for all fields added as descendants of the FormPanel. Any config option recognized by implementations
 * of {@link Ext.form.Labelable} may be included in this object. See the {@link #fieldDefaults} documentation
 * for details of how the defaults are applied.
 * 
 * # Form Validation
 * 
 * With the default configuration, form fields are validated on-the-fly while the user edits their values.
 * This can be controlled on a per-field basis (or via the {@link #fieldDefaults} config) with the field
 * config properties {@link Ext.form.field.Field#validateOnChange} and {@link Ext.form.field.Base#checkChangeEvents},
 * and the FormPanel's config properties {@link #pollForChanges} and {@link #pollInterval}.
 * 
 * Any component within the FormPanel can be configured with `formBind: true`. This will cause that
 * component to be automatically disabled when the form is invalid, and enabled when it is valid. This is most
 * commonly used for Button components to prevent submitting the form in an invalid state, but can be used on
 * any component type.
 * 
 * For more information on form validation see the following:
 * 
 * - {@link Ext.form.field.Field#validateOnChange}
 * - {@link #pollForChanges} and {@link #pollInterval}
 * - {@link Ext.form.field.VTypes}
 * - {@link Ext.form.Basic#doAction BasicForm.doAction clientValidation notes}
 * 
 * # Form Submission
 * 
 * By default, Ext Forms are submitted through Ajax, using {@link Ext.form.action.Action}. See the documentation for
 * {@link Ext.form.Basic} for details.
 *
 * # Example usage
 * 
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         title: 'Simple Form',
 *         bodyPadding: 5,
 *         width: 350,
 * 
 *         // The form will submit an AJAX request to this URL when submitted
 *         url: 'save-form.php',
 * 
 *         // Fields will be arranged vertically, stretched to full width
 *         layout: 'anchor',
 *         defaults: {
 *             anchor: '100%'
 *         },
 * 
 *         // The fields
 *         defaultType: 'textfield',
 *         items: [{
 *             fieldLabel: 'First Name',
 *             name: 'first',
 *             allowBlank: false
 *         },{
 *             fieldLabel: 'Last Name',
 *             name: 'last',
 *             allowBlank: false
 *         }],
 * 
 *         // Reset and Submit buttons
 *         buttons: [{
 *             text: 'Reset',
 *             handler: function() {
 *                 this.up('form').getForm().reset();
 *             }
 *         }, {
 *             text: 'Submit',
 *             formBind: true, //only enabled once the form is valid
 *             disabled: true,
 *             handler: function() {
 *                 var form = this.up('form').getForm();
 *                 if (form.isValid()) {
 *                     form.submit({
 *                         success: function(form, action) {
 *                            Ext.Msg.alert('Success', action.result.msg);
 *                         },
 *                         failure: function(form, action) {
 *                             Ext.Msg.alert('Failed', action.result.msg);
 *                         }
 *                     });
 *                 }
 *             }
 *         }],
 *         renderTo: Ext.getBody()
 *     });
 *
 */
Ext.define('Ext.form.Panel', {
    extend:'Ext.panel.Panel',
    mixins: {
        fieldAncestor: 'Ext.form.FieldAncestor'
    },
    alias: 'widget.form',
    alternateClassName: ['Ext.FormPanel', 'Ext.form.FormPanel'],
    requires: ['Ext.form.Basic', 'Ext.util.TaskRunner'],

    /**
     * @cfg {Boolean} pollForChanges
     * If set to `true`, sets up an interval task (using the {@link #pollInterval}) in which the
     * panel's fields are repeatedly checked for changes in their values. This is in addition to the normal detection
     * each field does on its own input element, and is not needed in most cases. It does, however, provide a
     * means to absolutely guarantee detection of all changes including some edge cases in some browsers which
     * do not fire native events. Defaults to `false`.
     */

    /**
     * @cfg {Number} pollInterval
     * Interval in milliseconds at which the form's fields are checked for value changes. Only used if
     * the {@link #pollForChanges} option is set to `true`. Defaults to 500 milliseconds.
     */

    /**
     * @cfg {Ext.enums.Layout/Object} layout
     * The {@link Ext.container.Container#layout} for the form panel's immediate child items.
     */
    layout: 'anchor',

    ariaRole: 'form',
    
    basicFormConfigs: [
        'api', 
        'baseParams', 
        'errorReader', 
        'jsonSubmit',
        'method', 
        'paramOrder',
        'paramsAsHash',
        'reader',
        'standardSubmit',
        'timeout',
        'trackResetOnLoad',
        'url',
        'waitMsgTarget',
        'waitTitle'
    ],

    initComponent: function() {
        var me = this;

        if (me.frame) {
            me.border = false;
        }

        me.initFieldAncestor();
        me.callParent();

        me.relayEvents(me.form, [
            /**
             * @event beforeaction
             * @inheritdoc Ext.form.Basic#beforeaction
             */
            'beforeaction',
            /**
             * @event actionfailed
             * @inheritdoc Ext.form.Basic#actionfailed
             */
            'actionfailed',
            /**
             * @event actioncomplete
             * @inheritdoc Ext.form.Basic#actioncomplete
             */
            'actioncomplete',
            /**
             * @event validitychange
             * @inheritdoc Ext.form.Basic#validitychange
             */
            'validitychange',
            /**
             * @event dirtychange
             * @inheritdoc Ext.form.Basic#dirtychange
             */
            'dirtychange'
        ]);

        // Start polling if configured
        if (me.pollForChanges) {
            me.startPolling(me.pollInterval || 500);
        }
    },

    initItems: function() {
        // Create the BasicForm
        this.callParent();
        this.initMonitor();
        this.form = this.createForm();
    },

    // Initialize the BasicForm after all layouts have been completed.
    afterFirstLayout: function() {
        this.callParent(arguments);
        this.form.initialize();
    },

    /**
     * @private
     */
    createForm: function() {
        var cfg = {},
            props = this.basicFormConfigs,
            len = props.length,
            i = 0,
            prop;
            
        for (; i < len; ++i) {
            prop = props[i];
            cfg[prop] = this[prop];
        }
        return new Ext.form.Basic(this, cfg);
    },

    /**
     * Provides access to the {@link Ext.form.Basic Form} which this Panel contains.
     * @return {Ext.form.Basic} The {@link Ext.form.Basic Form} which this Panel contains.
     */
    getForm: function() {
        return this.form;
    },

    /**
     * Loads an {@link Ext.data.Model} into this form (internally just calls {@link Ext.form.Basic#loadRecord})
     * See also {@link Ext.form.Basic#trackResetOnLoad trackResetOnLoad}.
     * @param {Ext.data.Model} record The record to load
     * @return {Ext.form.Basic} The Ext.form.Basic attached to this FormPanel
     */
    loadRecord: function(record) {
        return this.getForm().loadRecord(record);
    },

    /**
     * Returns the currently loaded Ext.data.Model instance if one was loaded via {@link #loadRecord}.
     * @return {Ext.data.Model} The loaded instance
     */
    getRecord: function() {
        return this.getForm().getRecord();
    },
    
    /**
     * Persists the values in this form into the passed {@link Ext.data.Model} object in a beginEdit/endEdit block.
     * If the record is not specified, it will attempt to update (if it exists) the record provided to {@link #loadRecord}.
     * @param {Ext.data.Model} [record] The record to edit
     * @return {Ext.form.Basic} The Ext.form.Basic attached to this FormPanel
     */
    updateRecord: function(record) {
        return this.getForm().updateRecord(record);
    },

    /**
     * Convenience function for fetching the current value of each field in the form. This is the same as calling
     * {@link Ext.form.Basic#getValues this.getForm().getValues()}.
     *
     * @inheritdoc Ext.form.Basic#getValues
     */
    getValues: function(asString, dirtyOnly, includeEmptyText, useDataValues) {
        return this.getForm().getValues(asString, dirtyOnly, includeEmptyText, useDataValues);
    },
    
    /**
     * Convenience function to check if the form has any dirty fields. This is the same as calling
     * {@link Ext.form.Basic#isDirty this.getForm().isDirty()}.
     *
     * @inheritdoc Ext.form.Basic#isDirty
     */
    isDirty: function () {
        return this.form.isDirty();
    },
    
    /**
     * Convenience function to check if the form has all valid fields. This is the same as calling
     * {@link Ext.form.Basic#isValid this.getForm().isValid()}.
     *
     * @inheritdoc Ext.form.Basic#isValid
     */
    isValid: function () {
       return this.form.isValid();
    },
    
    /**
     * Convenience function to check if the form has any invalid fields. This is the same as calling
     * {@link Ext.form.Basic#hasInvalidField this.getForm().hasInvalidField()}.
     *
     * @inheritdoc Ext.form.Basic#hasInvalidField
     */
    hasInvalidField: function () {
        return this.form.hasInvalidField();
    },

    beforeDestroy: function() {
        this.stopPolling();
        this.form.destroy();
        this.callParent();
    },

    /**
     * This is a proxy for the underlying BasicForm's {@link Ext.form.Basic#load} call.
     * @param {Object} options The options to pass to the action (see {@link Ext.form.Basic#load} and
     * {@link Ext.form.Basic#doAction} for details)
     */
    load: function(options) {
        this.form.load(options);
    },

    /**
     * This is a proxy for the underlying BasicForm's {@link Ext.form.Basic#submit} call.
     * @param {Object} options The options to pass to the action (see {@link Ext.form.Basic#submit} and
     * {@link Ext.form.Basic#doAction} for details)
     */
    submit: function(options) {
        this.form.submit(options);
    },

    /**
     * Start an interval task to continuously poll all the fields in the form for changes in their
     * values. This is normally started automatically by setting the {@link #pollForChanges} config.
     * @param {Number} interval The interval in milliseconds at which the check should run.
     */
    startPolling: function(interval) {
        this.stopPolling();
        var task = new Ext.util.TaskRunner(interval);
        task.start({
            interval: 0,
            run: this.checkChange,
            scope: this
        });
        this.pollTask = task;
    },

    /**
     * Stop a running interval task that was started by {@link #startPolling}.
     */
    stopPolling: function() {
        var task = this.pollTask;
        if (task) {
            task.stopAll();
            delete this.pollTask;
        }
    },

    /**
     * Forces each field within the form panel to
     * {@link Ext.form.field.Field#checkChange check if its value has changed}.
     */
    checkChange: function() {
        var fields = this.form.getFields().items,
            f,
            fLen   = fields.length;

        for (f = 0; f < fLen; f++) {
            fields[f].checkChange();
        }
    }
});
