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<?php
/**
* Returns a form containing a number of other forms.
*
* When the forms are submitted their first button is pressed in array order.
* Make sure you rearrange the buttons in your form accordingly in a form_alter
* when using this function.
*
* @param ...
* Every argument is a list of arguments to be passed to drupal_get_form.
* For example, if the first form is called as
* drupal_get_form($form_id1, $arg1, $arg2); and
* the second as drupal_get_form($form_id2, $arg3, $arg4) call
* multiform_get_form(array($form_id1, $arg1, $arg2), array($form_id2, $arg3, $arg4)).
*/
function multiform_get_form() {
$all_args = func_get_args();
$redirect = NULL;
$form = element_info('form');
$form['#id'] = 'multiform';
$form['#attributes'] = array();
// We need a $form_id so that the submission of other forms (like search) do
// not disturb us.
$form['form_id'] = array(
'#type' => 'hidden',
'#value' => 'multiform',
'#id' => drupal_html_id("edit-multiform"),
'#name' => 'form_id',
'#attributes' => array(),
);
$build_id = 'form-' . drupal_random_key();
// We need a $form_build_id because the buttons are cached and the values
// belonging to them in $_POST are handed to each form so those can recognize
// the buttons pressed.
$form['form_build_id'] = array(
'#type' => 'hidden',
'#value' => $build_id,
'#id' => $build_id,
'#name' => 'form_build_id',
'#attributes' => array(),
);
// This is where buttons will be collected.
$form['buttons'] = array();
$form['buttons']['#weight'] = 1000;
$form['buttons']['#build_id'] = $build_id;
$form_state_save = array();
$button_names = array();
// The only way to support $_GET would be to accept $form_state. Maybe later.
if ($_POST && isset($_POST['form_id']) && $_POST['form_id'] == 'multiform' && !empty($_POST['form_build_id'])) {
$form_state_save['input'] = $_POST;
$_files_save = $_FILES;
// Retrieve buttons.
if ($button_elements = form_get_cache($_POST['form_build_id'], $form_state_save)) {
foreach ($button_elements as $button) {
// For each button, save it's name. Later on we will need the button
// names because the buttons are used in the multiform but their values
// in $_POST (if it exists) needs to be handed down to each form so
// those can recognize the button press.
$name = isset($button_elements['#name']) ? $button_elements['#name'] : 'op';
$button_names[$name] = $name;
}
}
}
foreach ($all_args as $key => $args) {
$form_id = array_shift($args);
// Reset $form_state and disable redirection.
$form_state = array('no_redirect' => TRUE);
// This line is copied literally from drupal_get_form().
$form_state['build_info']['args'] = $args;
$index = $form_id . '_' . $key;
if (isset($form_state_save['input']['multiform'][$index])) {
// drupal_build_form() honors our $form_state['input'] setup.
$form_state['input'] = $form_state_save['input']['multiform'][$index];
// Pass in the information about pressed buttons too.
foreach ($button_names as $name) {
if (isset($form_state_save['input'][$name])) {
$form_state['input'][$name] = $form_state_save['input'][$name];
}
}
}
if (isset($_files_save['multiform']['name'][$index])) {
$_FILES = array();
foreach (array('name', 'type', 'tmp_name', 'error', 'size') as $files_key) {
// PHP is seriously messed up, dude.
foreach ($_files_save['multiform'][$files_key][$index] as $running_out_of_indexes => $data) {
$_FILES[$running_out_of_indexes][$files_key] = $data;
}
}
}
// Build and process this form.
$current_form = drupal_build_form($form_id, $form_state);
// Do not render the <form> tags. Instead we render the <form> as a <div>.
$current_form['#theme_wrappers'] = array('container');
_multiform_get_form($current_form, $form['buttons'], $index);
// Unset any attributes specifics to form tags.
$disallowed_attributes = array('enctype', 'action', 'method');
$current_form['#attributes'] = array_diff_key($current_form['#attributes'], array_flip($disallowed_attributes));
$form['multiform'][$index] = $current_form;
if (isset($form_state['has_file_element'])) {
$form['#attributes']['enctype'] = 'multipart/form-data';
}
// Keep the redirect from the first form.
if (!$key) {
$redirect = isset($form_state['redirect']) ? $form_state : array();
}
}
form_set_cache($build_id, $form['buttons'], $form_state_save);
if (!empty($form_state_save['input'])) {
// We forced $form_state['no_redirect'] to TRUE above, so unset it in order
// to allow the redirection to proceed.
unset($redirect['no_redirect']);
drupal_redirect_form($redirect);
}
return $form;
}
/**
* Recursive helper for multiform_get_form().
*/
function _multiform_get_form(&$element, &$buttons, $form_id) {
// Recurse.
foreach (element_children($element) as $key) {
_multiform_get_form($element[$key], $buttons, $form_id);
}
// Save but do not display buttons. Note that this is done before the #name
// is changed. This way the buttons belong to the top form and their values
// can be handed to each form.
if (isset($element['#button_type'])) {
$buttons[$element['#value']] = $element;
$element['#access'] = FALSE;
}
// By only changing $element['#name'] form API is not affected but the
// browser will put the element values into _POST where multiform_get_form
// expects them.
elseif (isset($element['#name'])) {
// If the name was op then we want multiform[$form_id][op]. If it was
// foo[bar] then we want multiform[$form_id][foo][bar].
$element['#name'] = "multiform[$form_id]" . preg_replace('/^[^[]+/', '[\0]', $element['#name']);
}
}
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