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✏️ Editing: Util_Widget.php

<?php
namespace W3TC;

class Util_Widget {
	/**
	 * Registers dashboard widgets.
	 *
	 * Handles POST data, sets up filters.
	 *
	 * @since 0.9.2.6
	 */
	static public function setup() {
		global $w3tc_registered_widgets, $w3tc_registered_widget_controls, $w3tc_dashboard_control_callbacks;
		$w3tc_dashboard_control_callbacks = array();
		$screen = get_current_screen();

$update = false;
		$widget_options = get_option( 'w3tc_dashboard_widget_options' );
		if ( !$widget_options || !is_array( $widget_options ) )
			$widget_options = array();

// Hook to register new widgets
		// Filter widget order
		if ( is_network_admin() ) {
			do_action( 'w3tc_network_dashboard_setup' );
			$dashboard_widgets = apply_filters( 'w3tc_network_dashboard_widgets', array() );
		} else {
			do_action( 'w3tc_widget_setup' );
			$dashboard_widgets = apply_filters( 'w3tc_dashboard_widgets', array() );
		}

foreach ( $dashboard_widgets as $widget_id ) {
			$name = empty( $w3tc_registered_widgets[$widget_id]['all_link'] ) ? $w3tc_registered_widgets[$widget_id]['name'] : $w3tc_registered_widgets[$widget_id]['name'] . " <a href='{$w3tc_registered_widgets[$widget_id]['all_link']}' class='edit-box open-box'>" . __( 'View all' ) . '</a>';
			Util_Widget::add( $widget_id, $name, $w3tc_registered_widgets[$widget_id]['callback'], $w3tc_registered_widget_controls[$widget_id]['callback'] );
		}

if ( 'POST' == $_SERVER['REQUEST_METHOD'] && isset( $_POST['widget_id'] ) ) {
			check_admin_referer( 'edit-dashboard-widget_' . $_POST['widget_id'], 'dashboard-widget-nonce' );
			ob_start(); // hack - but the same hack wp-admin/widgets.php uses
			Util_Widget::trigger_widget_control( $_POST['widget_id'] );
			ob_end_clean();
		}

if ( $update )
			update_option( 'w3tc_dashboard_widget_options', $widget_options );

do_action( 'do_meta_boxes', $screen->id, 'normal', '' );
		do_action( 'do_meta_boxes', $screen->id, 'side', '' );
	}

/**
	 * Registers widget
	 */
	static public function add( $widget_id, $widget_name, $callback,
		$control_callback = null, $location = 'normal' ) {
		$screen = get_current_screen();
		global $w3tc_dashboard_control_callbacks;

if ( substr( $widget_name, 0, 1 ) != '<' )
			$widget_name = '<div class="w3tc-widget-text">' . $widget_name .
				'</div>';

// it's url
		if ( $control_callback && current_user_can( 'edit_dashboard' ) &&
			is_string( $control_callback ) ) {
			$widget_name .= ' <div class="w3tc-widget-configure postbox-title-action">' .
				'<a href="' . esc_url( $control_callback ) .
				'" class="edit-box open-box">' . __( 'Configure' ) .
				'</a></span>';
		}

// it's ajax callback
		if ( $control_callback && current_user_can( 'edit_dashboard' ) &&
			is_callable( $control_callback ) ) {
			$w3tc_dashboard_control_callbacks[$widget_id] = $control_callback;
			if ( isset( $_GET['edit'] ) && $widget_id == $_GET['edit'] ) {
				list( $url ) = explode( '#', add_query_arg( 'edit', false ), 2 );
				$widget_name .= ' <span class="postbox-title-action">' .
					'<a href="' . esc_url( $url ) . '">' . __( 'Cancel' ) .
					'</a></span>';

$callback = array(
					'\W3TC\Util_Widget',
					'_dashboard_control_callback'
				);
			} else {
				list( $url ) = explode( '#', add_query_arg( 'edit', $widget_id ), 2 );
				$widget_name .= ' <span class="postbox-title-action">' .
					'<a href="' . esc_url( "$url#$widget_id" ) .
					'" class="edit-box open-box">' . __( 'Configure' ) .
					'</a></span>';
			}
		}

$side_widgets = array();

$priority = 'core';

add_meta_box( $widget_id, $widget_name, $callback, $screen, $location, $priority );
	}

/* Dashboard Widgets Controls */
	static public function _dashboard_control_callback( $dashboard, $meta_box ) {
		echo '<form action="" method="post" class="dashboard-widget-control-form">';
		Util_Widget::trigger_widget_control( $meta_box['id'] );
		wp_nonce_field( 'edit-dashboard-widget_' . $meta_box['id'], 'dashboard-widget-nonce' );
		echo '<input type="hidden" name="widget_id" value="' . esc_attr( $meta_box['id'] ) . '" />';
		submit_button( __( 'Submit' ) );
		echo '</form>';
	}

/**
	 * Calls widget control callback.
	 *
	 * @since 0.9.2.6
	 *
	 * @param int|bool $widget_control_id Registered Widget ID.
	 */
	static public function trigger_widget_control( $widget_control_id = false ) {
		global $w3tc_dashboard_control_callbacks;

if ( is_scalar( $widget_control_id ) && $widget_control_id && isset( $w3tc_dashboard_control_callbacks[$widget_control_id] ) && is_callable( $w3tc_dashboard_control_callbacks[$widget_control_id] ) ) {
			call_user_func( $w3tc_dashboard_control_callbacks[$widget_control_id], '', array( 'id' => $widget_control_id, 'callback' => $w3tc_dashboard_control_callbacks[$widget_control_id] ) );
		}
	}
}

MR SKB