// $Id$

/**
 * Manipulation of content remove buttons.
 *
 * An onClick event handler is bound to each remove button, from where
 * onRemove events are invoked before the field widget is hidden.
 * There is a default onRemove handler that is executed first in the chain,
 * and it is used to enable the checked attribute of the remove checkbox.
 * Custom onRemove handlers are executed later, and can be used to perform
 * additional processing, or even disable the checked attribute of the
 * remove checkbox. The field widget will only be hidden if the checked
 * attribute of the remove checkbox is still enable after all onRemove
 * handlers have been executed.
 *
 * - Custom onRemove handlers may be attached to remove buttons as follows:
 *
 *   <code>
 *     $('.content-remove-button').not('.myclass-processed').each(function() {
 *       // Make sure the element is not processed more than once.
 *       $(this).addClass('.myclass-processed');
 *       // Attach custom onRemove handler.
 *       $(this)..bind('remove', myOnRemoveHandler);
 *     });
 *   </code>
 *
 * - onRemove handlers are executed with the following arguments:
 *   event     - The onClick event object.
 *   settings  - An object with the following properties:
 *     checkbox_id  - The ID of the checkbox element.
 *     checkbox     - The DOM object of the remove checkbox element.
 *     button       - The DOM object of the remove button element.
 *     field_name   - The name of the field.
 *     delta        - The delta of the field item.
 *
 * - Custom onRemove handlers may uncheck the checkbox element as follows:
 *
 *   <code>
 *     $('input[@id='+ settings.checkbox_id +']').attr('checked', '');
 *   </code>
 */
Drupal.behaviors.contentRemoveButtons = function() {
  $('.content-remove-button').not('.content-remove-button-processed').each(function() {
    // Make sure the element is not processed more than once, then
    // attach our onClick and default onRemove handlers.
    $(this).addClass('.content-remove-button-processed')
      .bind('click', Drupal.contentRemoveButtons.onClick)
      .bind('remove', Drupal.contentRemoveButtons.onRemove);
  });
};

Drupal.contentRemoveButtons = {};

/**
 * onClick handler for content remove buttons.
 */
Drupal.contentRemoveButtons.onClick = function(event) {
  var settings = $(this).attr('rel').split('|');

  // Trigger all onRemove events attached to the button.
  $(this).trigger('remove', [event, {
    checkbox_id: settings[0],
    checkbox: $('#'+ settings[0]).get(0),
    button: this,
    field_name: settings[1],
    delta: settings[2]
  }]);

  // Hide the table row of the widget, but only if the checkbox element is
  // still checked after all onRemove handlers.
  if ($('input[@id='+ settings[0] +']:checked').val()) {
    $(this).parents('tr:first').fadeOut('slow');
  }

  return false;
};

/**
 * onRemove handler for content remove buttons.
 */
Drupal.contentRemoveButtons.onRemove = function(event, settings) {
  $('input[@id='+ settings.checkbox_id +']').attr('checked', 'checked');
};