Wygwam extension for adding custom toolbar buttons

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<?php if (! defined('BASEPATH')) exit('No direct script access allowed');


require_once PATH_THIRD.'matrix/config.php';


/**
 * Wygwam Custom Toolbar Button
 *
 * This is a sample extension that would add a plugin to Wygwam’s extraPlugins setting,
 * and add its toolbar button.
 */
class Wygwam_custom_toolbar_button_ext {

	var $name = 'Wygwam Custom Toolbar Button';
	var $version = '1.0';
	var $settings_exist = 'n';
	var $docs_url = 'http://pixelandtonic.com/wygwam/docs/wygwam_config';

	/**
	 * Constructor
	 */
	function __construct()
	{
		$this->EE =& get_instance();
	}

	// --------------------------------------------------------------------

	/**
	 * Activates the extension
	 */
	function activate_extension()
	{
		$this->EE->db->insert('extensions', array(
			'class'    => get_class($this),
			'method'   => 'wygwam_config',
			'hook'     => 'wygwam_config',
			'settings' => '',
			'priority' => 10,
			'version'  => $this->version,
			'enabled'  => 'y'
		));
	}

	/**
	 * Updates the version number in exp_extension,
	 * and any other DB changes we might need to make between versions
	 */
	function update_extension($current = FALSE)
	{
		if (! $current || $current == $this->version)
		{
			return FALSE;
		}

		$this->EE->db->where('class', get_class($this))
		             ->update('extensions', array('version' => $this->version));
	}

	/**
	 * Disables the extension
	 */
	function disable_extension()
	{
		$this->EE->db->where('class', get_class($this))
		             ->delete('extensions');
	}

	/**
	 * Adds our plugin to Wygwam’s extraPlugins setting
	 * and adds our custom toolbar button
	 */
	function wygwam_config($config, $settings)
	{
		// Get the latest $config if we're
		// sharing the extension with another hook
		if ($this->EE->extensions->last_call !== FALSE)
		{
			$config = $this->EE->extensions->last_call;
		}

		// Add our plugin to the extraPlugins setting
		if (!empty($config['extraPlugins']))
			$config['extraPlugins'] .= ',';

		$config['extraPlugins'] .= 'MyPluginName';

		// Add our toolbar button(s) here
		$config['toolbar'][] = array('MyFirstButton', 'MySecondButton');

		return $config;
	}
}