[wp-trac] [WordPress Trac] #31559: Meta boxes should have before/after hooks

[WordPress Trac]

#31559: Meta boxes should have before/after hooks
----------------------------+-----------------------------
 Reporter:  jtsternberg     |      Owner:
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  General         |    Version:  trunk
 Severity:  normal          |   Keywords:
  Focuses:  administration  |
----------------------------+-----------------------------
 Currently there is no way to hook into an existing metabox. If I wanted to
 modify the featured image metabox (add a checkbox or something), I'd have
 to unregister the metabox, and re-register w/ my own callback. This is not
 good for compatibility w/ other plugins, etc.

 I propose before_callback and after_callback hooks for metaboxes.

 Basically, we'd replace this:

 {{{
 echo '<div class="inside">' . "\n";
 call_user_func($box['callback'], $object, $box);
 echo "</div>\n";
 }}}

 with:

 {{{
 echo '<div class="inside">' . "\n";

 do_action( 'before_metabox_callback', $object, $box );
 do_action( "before_{$box['id']}_metabox_callback", $object, $box );

 call_user_func($box['callback'], $object, $box);

 do_action( 'after_metabox_callback', $object, $box );
 do_action( "after_{$box['id']}_metabox_callback", $object, $box );

 echo "</div>\n";
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/31559>
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