Template for custom form not working

Question

I am trying to theme a custom using a template file but unfortunately I am not getting it by using the below method. listing.module

function listing_menu() {
  $items['ad-listing'] = array(
    'page callback' => 'adlist_template',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,

  );
      return $items;
    }
function listing_form($form, &$form_state) {

$form['title'] = array(
    '#type' => 'textfield',
    '#attributes' => array('placeholder' => t('Title')),
);
$form['category'] = array(
    '#type' => 'select',
    '#options' => array(
        'default' => '- Category -',
        'Car' => 'Car',
        'Van' => 'Van',
    ),
);
 return $form
}

function listing_theme($existing, $type, $theme, $path){
return array(
  'listing_form' => array(
    'render element' => 'form',
    'template' => 'adlisting',
    'path' => drupal_get_path('module', 'listing') . '/form',
  )
    );
}
function adlist_template(){
    return theme('listing_form');
}

listing/form/adlisting.tpl.php

<div class="row">
  <div class="small-12 medium-12 large-8">

      <div class="row">
          <div class="small-12 columns">
              <h5 class="">Contact Information</h5>
          </div>
      </div>

      <div class="row">
          <div class="small-12 large-6 medium-6 columns">
              <?php print render($form['title']); ?>
          </div>
      </div>

      <div class="row">
          <div class="small-12 medium-6 large-6 columns">
              <?php print render($form['category']); ?>
          </div>

  <div class="row">
      <div class="small-12 medium-12 large-8 large-offset-2 columns">
          <?php print render($form['ad_submit']); ?>
      </div>
  </div>

I tried to follow this thread How to a use a template file to theme a form? but did not help me, neither other solutions

Answer 1

There were 2 major changes on the code above

1. I changed the form name to listing_adform()
2. I changed the hook_menu to call my form not theme

  $items['ad-listing'] = array(
    //'page callback' => 'adlist_template',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
    'page callback' => 'drupal_get_form',
    'page arguments' => array('listing_adform'),
  );

Flushed the cache, and I saw my fields rendering using my template in form/adlisting.tpl.php