<?php
// $Id$

define('CHECKBOX_EXAMPLE_MULTIPAGE', 1); // Change to 0 to make the form a single page.

/**
 * Implementation of hook_menu().
 */
function checkboxes_example_menu($may_cache) {
  $items = array();
  if ($may_cache) {
    $items[] = array(
      'path' => 'checkboxes_example',
      'title' => t('Checkboxes Example'),
      'description' => t(''),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('checkboxes_example_form'),
      'access'   => user_access('view checkboxes'),
      'type' => MENU_NORMAL_ITEM,
    );
  }
  return $items;
}

function checkboxes_example_form($form_values = NULL) {
  if (!isset($form_values)) {
    $step = 1;
  }
  else {
    $step = $form_values['step'] + 1;
  }
  
  $form['step'] = array(
    '#type' => 'hidden',
    '#value' => $step,
  );

  switch ($step) {
    case 1:
      $form['message'] = array(
        '#type' => 'item',
        '#title' => t('Page'),
        '#value' => t('This is the first page of a multistep form.'),
      );
      if (CHECKBOX_EXAMPLE_MULTIPAGE == 1) {
        $form['submit'] = array(
          '#type' => 'submit',
          '#value' => t('Next'),
        );
        break;
      }
      
    case 2:
      $form['message'] = array(
        '#type' => 'item',
        '#title' => t('Page'),
        '#value' => t('This is the second page of a multistep form.'),
      );
      $form['checks'] = array(
        '#type' => 'checkboxes',
        '#title' => t('Some options'),
        '#description' => t('Items 3 and 5 should be checked'),
        '#options' => array(
          1 => t('Item 1'),
          2 => t('Item 2'),
          3 => t('Item 3'),
          4 => t('Item 4'),
          5 => t('Item 5'),
        ),
        '#default_value' => array(3, 5),
      );
      $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Submit'),
      );
      break;
  }
  
  if (CHECKBOX_EXAMPLE_MULTIPAGE == 1) {
    $form['#redirect'] = FALSE;
    $form['#multistep'] = TRUE;
  }
  return $form;
}

function checkboxes_example_form_submit($form_id, $form_values) {
}