WP Customizer API loaded into functions.php

Question

Heyo,

I'm once again sort of stuck with my Customizer API. I've worked quiet a lot on the Theme Customization of my Theme and my functions.php is getting a bit out of hand. Is there a way I can put all these "panels/sections/settings/controls" in an extra file and just load that file into the functions.php?

And even thoe is there a way I can load that file only if the Customizer is open?

Thanks in advance!

Answer 1

Yes. You can load the code in the customize_register action. One example:

<?php
// File: functions.php
add_action( 'customize_register', function( $wp_customize ) {
    require_once dirname( __FILE__ ) . '/inc/customize.php';
    wpse256532_customize_register( $wp_customize );
} );

And the inc/customize.php file:

<?php
// File: customize.php
function wpse256532_customize_register( $wp_customize ) {
    $wp_customize->add_setting( /* ... */ );
    $wp_customize->add_control( /* ... */ );
    // ...
}
// ... any additional customizer classes and other includes ...