Exposed Tagging Filter

Thanks Merlin!

It will some time before I start development on this one, but I'll probably be back with some more questions then.

Thanks for the tip, I will definately look into that module!

Dave

Ok I've started working on this, but I'm having a hard time getting my head around certain things. This is what I have so far:

viewtagging.views.inc

function viewtagging_views_data()
{
	return NULL;
}

function viewtagging_views_plugins()
{
	return NULL;
}

function viewtagging_views_data_alter(&$data)
{
  $data['node']['term_tags'] = array(
    'group' => t('Taxonomy'),
    'title' => t('Term Tagging'),
    'help' => t('Activate Tagging for your term ids.'),
	'filter' => array(
      'handler' => 'viewtagging_handler_filter_term_tags',
    ),
  );
}

function viewtagging_views_handlers ()
{
  return array(
    'info' => array(
      'path' => drupal_get_path('module', 'viewtagging'),
    ),
    'handlers' => array(
      'viewtagging_handler_filter_term_tags' => array(
        'parent' => 'views_handler_filter_many_to_one',
      ),
    ),
  );
}

viewtagging_handler_filter_term_tags.inc

<?php

/**
 * Taggable views
 */

class viewtagging_handler_filter_term_tags extends views_handler_filter {

  //filter has extra options
  function has_extra_options() { return TRUE; }

  function extra_options_form(&$form, &$form_state) {
  
    $vocabularies = taxonomy_get_vocabularies();
	
    foreach ($vocabularies as $voc) {
      $options[$voc->vid] = check_plain($voc->name);
    }

      $form['vid'] = array(
        '#prefix' => '<div class="views-left-40">',
        '#suffix' => '</div>',
        '#type' => 'radios',
        '#title' => t('Vocabulary'),
        '#options' => $options,
        '#description' => t('Select which vocabulary to show terms for in the regular options.'),
        '#default_value' => $this->options['vid'],
      );
	  
  }
  
  //override query function for now
  function query () 
  {
  }
 
  function exposed_form(&$form, &$form_state) { 
	//selected vid
	$vid = $this->options['vid'];
	
	//get all terms
	$voc = taxonomy_get_tree($vid);
	
	//render a button per term
	foreach ( $voc as $term )
	{
		$form['terms']['term_'.$term->tid] = array(
		'#type' => 'submit',
		'#value' => t($term->name),
		'#disabled' => false,
		);
	}
  }
	
  //This filter is always exposed, wouldn't make any sense if it weren't	
  function can_expose() { return TRUE; }
  function is_exposed() { return TRUE; }

}

If I activate this in views, it renders out a button for every taxonomy term that is available. The user should be able to click one of the buttons to "switch" this term und and off.

My questions are:
1) Does the code make any sense so far?
2) Can I use the table definitions of the views.taxonomy modules somehow without having to copy them into my module?
3) Should I be extending something like views_handler_filter_many_to_one? I'm not sure it suits my needs in terms of the user interface.
4) I don't understand how I can access (read and write) the options of the exposed filter. With that I mean the ?myfilterops=tag1/tag2/tag3 part of the url.

Thanks once again for your help.