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Filename : form-customizer.php
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<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

if ( ! class_exists( 'acf_form_customizer' ) ) :

	class acf_form_customizer {


		/*
		*  __construct
		*
		*  This function will setup the class functionality
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function __construct() {

			// vars
			$this->preview_values = array();
			$this->preview_fields = array();
			$this->preview_errors = array();

			// actions
			add_action( 'customize_controls_init', array( $this, 'customize_controls_init' ) );
			add_action( 'customize_preview_init', array( $this, 'customize_preview_init' ), 1, 1 );
			add_action( 'customize_save', array( $this, 'customize_save' ), 1, 1 );

			// save
			add_filter( 'widget_update_callback', array( $this, 'save_widget' ), 10, 4 );

		}


		/*
		*  admin_enqueue_scripts
		*
		*  This action is run after post query but before any admin script / head actions.
		*  It is a good place to register all actions.
		*
		*  @type    action (admin_enqueue_scripts)
		*  @date    26/01/13
		*  @since   3.6.0
		*
		*  @param   N/A
		*  @return  N/A
		*/

		function customize_controls_init() {

			// load acf scripts
			acf_enqueue_scripts(
				array(
					'context' => 'customize_controls',
				)
			);

			// actions
			add_action( 'acf/input/admin_footer', array( $this, 'admin_footer' ), 1 );

		}


		/*
		*  save_widget
		*
		*  This function will hook into the widget update filter and save ACF data
		*
		*  @type    function
		*  @date    27/05/2015
		*  @since   5.2.3
		*
		*  @param   $instance (array) widget settings
		*  @param   $new_instance (array) widget settings
		*  @param   $old_instance (array) widget settings
		*  @param   $widget (object) widget info
		*  @return  $instance
		*/

		function save_widget( $instance, $new_instance, $old_instance, $widget ) {

			// bail early if not valid (customize + acf values + nonce)
			if ( ! isset( $_POST['wp_customize'] ) || ! isset( $new_instance['acf'] ) || ! acf_verify_nonce( 'widget' ) ) {
				return $instance;
			}

			// vars
			$data = array(
				'post_id' => "widget_{$widget->id}",
				'values'  => array(),
				'fields'  => array(),
			);

			// append values
			$data['values'] = $new_instance['acf'];

			// append fields (name => key relationship) - used later in 'acf/get_field_reference' for customizer previews
			foreach ( $data['values'] as $k => $v ) {

				// get field
				$field = acf_get_field( $k );

				// continue if no field
				if ( ! $field ) {
					continue;
				}

				// update
				$data['fields'][ $field['name'] ] = $field['key'];

			}

			// append data to instance
			$instance['acf'] = $data;

			// return
			return $instance;

		}


		/*
		*  settings
		*
		*  This function will return an array of cutomizer settings that include ACF data
		*  similar to `$customizer->settings();`
		*
		*  @type    function
		*  @date    22/03/2016
		*  @since   5.3.2
		*
		*  @param   $customizer (object)
		*  @return  $value (mixed)
		*/

		function settings( $customizer ) {

			// vars
			$data     = array();
			$settings = $customizer->settings();

			// bail early if no settings
			if ( empty( $settings ) ) {
				return false;
			}

			// loop over settings
			foreach ( $settings as $setting ) {

				// vars
				$id = $setting->id;

				// verify settings type
				if ( substr( $id, 0, 6 ) == 'widget' || substr( $id, 0, 7 ) == 'nav_menu' ) {
					// allow
				} else {
					continue;
				}

				// get value
				$value = $setting->post_value();

				// bail early if no acf
				if ( ! is_array( $value ) || ! isset( $value['acf'] ) ) {
					continue;
				}

				// set data
				$setting->acf = $value['acf'];

				// append
				$data[] = $setting;

			}

			// bail early if no settings
			if ( empty( $data ) ) {
				return false;
			}

			// return
			return $data;

		}


		/*
		*  customize_preview_init
		*
		*  This function is called when customizer preview is initialized
		*
		*  @type    function
		*  @date    22/03/2016
		*  @since   5.3.2
		*
		*  @param   $customizer (object)
		*  @return  n/a
		*/

		function customize_preview_init( $customizer ) {

			// get customizer settings (widgets)
			$settings = $this->settings( $customizer );

			// bail early if no settings
			if ( empty( $settings ) ) {
				return;
			}

			// append values
			foreach ( $settings as $setting ) {

				// get acf data
				$data = $setting->acf;

				// append acf_value to preview_values
				$this->preview_values[ $data['post_id'] ] = $data['values'];
				$this->preview_fields[ $data['post_id'] ] = $data['fields'];

			}

			// bail early if no preview_values
			if ( empty( $this->preview_values ) ) {
				return;
			}

			// add filters
			add_filter( 'acf/pre_load_value', array( $this, 'pre_load_value' ), 10, 3 );
			add_filter( 'acf/pre_load_reference', array( $this, 'pre_load_reference' ), 10, 3 );

		}

		/**
		 *  pre_load_value
		 *
		 *  Used to inject preview value
		 *
		 *  @date    2/2/18
		 *  @since   5.6.5
		 *
		 *  @param   type $var Description. Default.
		 *  @return  type Description.
		 */

		function pre_load_value( $value, $post_id, $field ) {

			// check
			if ( isset( $this->preview_values[ $post_id ][ $field['key'] ] ) ) {
				return $this->preview_values[ $post_id ][ $field['key'] ];
			}

			// return
			return $value;
		}

		/**
		 *  pre_load_reference
		 *
		 *  Used to inject preview value
		 *
		 *  @date    2/2/18
		 *  @since   5.6.5
		 *
		 *  @param   type $var Description. Default.
		 *  @return  type Description.
		 */

		function pre_load_reference( $field_key, $field_name, $post_id ) {

			// check
			if ( isset( $this->preview_fields[ $post_id ][ $field_name ] ) ) {
				return $this->preview_fields[ $post_id ][ $field_name ];
			}

			// return
			return $field_key;
		}


		/*
		*  customize_save
		*
		*  This function is called when customizer saves a widget.
		*  Normally, the widget_update_callback filter would be used, but the customizer disables this and runs a custom action
		*  class-customizer-settings.php will save the widget data via the function set_root_value which uses update_option
		*
		*  @type    function
		*  @date    22/03/2016
		*  @since   5.3.2
		*
		*  @param   $customizer (object)
		*  @return  n/a
		*/

		function customize_save( $customizer ) {

			// get customizer settings (widgets)
			$settings = $this->settings( $customizer );

			// bail early if no settings
			if ( empty( $settings ) ) {
				return;
			}

			// append values
			foreach ( $settings as $setting ) {

				// get acf data
				$data = $setting->acf;

				// save acf data
				acf_save_post( $data['post_id'], $data['values'] );

				// remove [acf] data from saved widget array
				$id_data = $setting->id_data();
				add_filter( 'pre_update_option_' . $id_data['base'], array( $this, 'pre_update_option' ), 10, 3 );

			}

		}


		/*
		*  pre_update_option
		*
		*  this function will remove the [acf] data from widget insance
		*
		*  @type    function
		*  @date    22/03/2016
		*  @since   5.3.2
		*
		*  @param   $post_id (int)
		*  @return  $post_id (int)
		*/

		function pre_update_option( $value, $option, $old_value ) {

			// bail early if no value
			if ( empty( $value ) ) {
				return $value;
			}

			// loop over widgets
			// WP saves all widgets (of the same type) as an array of widgets
			foreach ( $value as $i => $widget ) {

				// bail early if no acf
				if ( ! isset( $widget['acf'] ) ) {
					continue;
				}

				// remove widget
				unset( $value[ $i ]['acf'] );

			}

			// return
			return $value;

		}


		/*
		*  admin_footer
		*
		*  This function will add some custom HTML to the footer of the edit page
		*
		*  @type    function
		*  @date    11/06/2014
		*  @since   5.0.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function admin_footer() {

			?>
<script type="text/javascript">
(function($) {
	
	// customizer saves widget on any input change, so unload is not needed
	acf.unload.active = 0;
	
	
	// hack customizer function to remove bug caused by WYSIWYG field using aunique ID
	// customizer compares returned AJAX HTML with the HTML of the widget form.
	// the _getInputsSignature() function is used to generate a string based of input name + id.
	// because ACF generates a unique ID on the WYSIWYG field, this string will not match causing the preview function to bail.
	// an attempt was made to remove the WYSIWYG unique ID, but this caused multiple issues in the wp-admin and altimately doesn't make sense with the tinymce rule that all editors must have a unique ID.
	// source: wp-admin/js/customize-widgets.js
	
	// vars
	var WidgetControl = wp.customize.Widgets.WidgetControl.prototype;
	
	
	// backup functions
	WidgetControl.__getInputsSignature = WidgetControl._getInputsSignature;
	WidgetControl.__setInputState = WidgetControl._setInputState;
	
	
	// modify __getInputsSignature
	WidgetControl._getInputsSignature = function( inputs ) {
		
		// vars
		var signature = this.__getInputsSignature( inputs );
			safe = [];
		
		
		// split
		signature = signature.split(';');
		
		
		// loop
		for( var i in signature ) {
			
			// vars
			var bit = signature[i];
			
			
			// bail early if acf is found
			if( bit.indexOf('acf') !== -1 ) continue;
			
			
			// append
			safe.push( bit );
			
		}
		
		
		// update
		signature = safe.join(';');
		
		
		// return
		return signature;
		
	};
	
	
	// modify _setInputState
	// this function deosn't seem to run on widget title/content, only custom fields
	// either way, this function is not needed and will break ACF fields 
	WidgetControl._setInputState = function( input, state ) {
		
		return true;
			
	};
		
})(jQuery);	
</script>
			<?php

		}

	}

	new acf_form_customizer();

endif;

?>