Hooks and Filters

Woo Document Preview Pro works by hooking into the free base plugin’s extension points and by exposing its own hooks for further customization. Everything below is defined in Pro’s own code.

Free base seams Pro hooks into

Pro registers callbacks on these filters provided by the free Document Preview for WooCommerce plugin. They are listed here so you know what Pro consumes, not because Pro defines them.

Filter	What Pro does with it
wcdp_preview_hook	Points the preview button at the store owner’s configured position.
wcdp_supported_extensions	Narrows the base plugin’s supported formats to the allowed list (remove-only).
wcdp_document_is_previewable	Gates a single document by the allowed file types and services.
wcdp_product_documents	Hides previews on products outside the allowed categories.
wcdp_meta_box_title	Appends the allowed-file-types note to the product document metabox title.
wcdp_admin_tabs	Registers the Pro Settings and License tabs on the shared settings screen.
wcdp_admin_view_path	Resolves the view file for each Pro tab.

Filters Pro defines

Filter	Location	Purpose
woo_document_preview_pro_supported_file_extensions	Pro Settings tab	Adjust the list of file formats offered in the allowed file-types selector. Passes an associative array of extension => label.

Actions Pro defines

The metabox renderer and the extension wrap points:

Action	Fires	Arguments
wcdp_pro_display_metabox_html	Renders the shared document section (bound to the renderer).	$post_id
wcdp_pro_admin_options_before	Before the Pro settings form fields.	none
wcdp_pro_admin_options_after	After the Pro settings form fields.	none
wcdp_pro_add_dokan_product_fields_before	Before the Dokan document fields.	none
wcdp_pro_add_dokan_product_fields_after	After the Dokan document fields.	none
wcdp_pro_add_wcfm_product_fields_before	Before the WCFM document fields.	none
wcdp_pro_add_wcfm_product_fields_after	After the WCFM document fields.	none
wcdp_pro_display_wcfm_dashboard_edit_page_before	Before the WCFM edit-page document fields.	none
wcdp_pro_display_wcfm_dashboard_edit_page_after	After the WCFM edit-page document fields.	none
wcdp_pro_display_wc_vendors_metabox_before	Before the WC Vendors document fields.	none
wcdp_pro_display_wc_vendors_metabox_after	After the WC Vendors document fields.	none

Example: add a custom format to the selector

add_filter( 'woo_document_preview_pro_supported_file_extensions', function ( $formats ) {
    $formats['rtf'] = 'RTF';
    return $formats;
} );

Adding a format to this selector only changes what the owner can pick. Whether the format is actually previewable is still decided by the free base plugin’s supported set.