I made some changes to the TinyMCE plugin for b2evolution to support some callbacks which will allow other b2evolution plugins to register TinyMCE plugins automatically. This is especially useful for the Gallery2 plugin because it will allow me to add a button that allows users to add photos from Gallery2 to their blog posts to TinyMCE automatically when the Gallery2 plugin is installed. Currently it’s a pain to get it to work because the standard gallery2 image chooser button doesn’t work with TinyMCE and installing it requires you to copy the g2image directory to another location.

Fortunately these sorts of callbacks are implemented in the b2evolution Plugin API already. I just needed to specify that the TinyMCE plugin has some extra callbacks and then fire the associated events at the right time. The code is a bit awkward but it serves it’s purpose.

The first part is specifying the extra events.

function GetExtraEvents()
{
  return array(
    "tinymce_before_init" => "Event that is called before tinymce is initialized",
    "tinymce_extend_plugins" => "Event called to allow other plugins to extend the plugin list",
    "tinymce_extend_buttons" => "Event called to allow other plugins to extend the button list"
  );
}

Then I fire the events like so. The tinymce_extend_plugins and tinymce_extend_buttons events allow other plugins to modify the plugins list and buttons list via a special get_trigger_event call.

$tmce_plugins_array =
  $Plugins->get_trigger_event("tinymce_extend_plugins",
    array("tinymce_plugins" => $tmce_plugins_array),
      "tinymce_plugins");

The plugins list is modified on the Gallery2 plugin side by adding an implementation of the event hook. In this case the tinymce_plugins key in the $params array is a reference that can be modified and passed back to the TinyMCE plugin.

function tinymce_extend_plugins( &$params ) {
  array_push($params["tinymce_plugins"], "-g2image");
}

You can view the changes made in the checked in code here.