File: wp-includes/class-wp-customize-manager.php

Custom wp_die wrapper. Returns either the standard message for UI or the Ajax message.

Gets the registered sections.

Returns the Ajax wp_die() handler if it’s a customized request.

Checks if the current theme is active.

Starts preview and customize theme.

Registers styles/scripts and initialize the preview of each setting

Callback to validate a theme once it is loaded

If the theme to be previewed isn’t the active theme, add filter callbacks to swap it out at runtime.

Prevents Ajax requests from following redirects when previewing a theme by issuing a 200 response instead of a 30x.

Returns the sanitized value for a given setting from the current customized state.

Stops previewing the selected theme.

Constructor.

Returns true if it’s an Ajax request.