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root / drupal7 / modules / poll / poll.module @ c7768a53

1
<?php
2

    
3
/**
4
 * @file
5
 * Enables your site to capture votes on different topics in the form of multiple
6
 * choice questions.
7
 */
8

    
9
/**
10
 * Implements hook_help().
11
 */
12
function poll_help($path, $arg) {
13
  switch ($path) {
14
    case 'admin/help#poll':
15
      $output = '';
16
      $output .= '<h3>' . t('About') . '</h3>';
17
      $output .= '<p>' . t('The Poll module can be used to create simple surveys or questionnaires that display cumulative results. A poll is a good way to receive feedback from site users and community members. For more information, see the online handbook entry for the <a href="@poll">Poll module</a>.', array('@poll' => 'http://drupal.org/documentation/modules/poll/')) . '</p>';
18
      $output .= '<h3>' . t('Uses') . '</h3>';
19
      $output .= '<dl>';
20
      $output .= '<dt>' . t('Creating a poll') . '</dt>';
21
      $output .= '<dd>' . t('Users can create a poll by clicking on Poll on the <a href="@add-content">Add new content</a> page, and entering the question being posed, the answer choices, and beginning vote counts for each choice. The status (closed or active) and duration (length of time the poll remains active for new votes) can also be specified.', array('@add-content' => url('node/add'))) . '</dd>';
22
      $output .= '<dt>' . t('Viewing polls') . '</dt>';
23
      $output .= '<dd>' . t('You can visit the <a href="@poll">Polls</a> page to view all current polls, or alternately enable the <em>Most recent poll</em> block on the <a href="@blocks">Blocks administration page</a>. To vote in or view the results of a specific poll, you can click on the poll itself.', array('@poll' => url('poll'), '@blocks' => url('admin/structure/block'))) . '</dd>';
24
      $output .= '</dl>';
25
      return $output;
26
  }
27
}
28

    
29
/**
30
 * Implements hook_theme().
31
 */
32
function poll_theme() {
33
  $theme_hooks = array(
34
    'poll_vote' => array(
35
      'template' => 'poll-vote',
36
      'render element' => 'form',
37
    ),
38
    'poll_choices' => array(
39
      'render element' => 'form',
40
    ),
41
    'poll_results' => array(
42
      'template' => 'poll-results',
43
      'variables' => array('raw_title' => NULL, 'results' => NULL, 'votes' => NULL, 'raw_links' => NULL, 'block' => NULL, 'nid' => NULL, 'vote' => NULL),
44
    ),
45
    'poll_bar' => array(
46
      'template' => 'poll-bar',
47
      'variables' => array('title' => NULL, 'votes' => NULL, 'total_votes' => NULL, 'vote' => NULL, 'block' => NULL),
48
    ),
49
  );
50
  // The theme system automatically discovers the theme's functions and
51
  // templates that implement more targeted "suggestions" of generic theme
52
  // hooks. But suggestions implemented by a module must be explicitly
53
  // registered.
54
  $theme_hooks += array(
55
    'poll_results__block' => array(
56
      'template' => 'poll-results--block',
57
      'variables' => $theme_hooks['poll_results']['variables'],
58
    ),
59
    'poll_bar__block' => array(
60
      'template' => 'poll-bar--block',
61
      'variables' => $theme_hooks['poll_bar']['variables'],
62
    ),
63
  );
64
  return $theme_hooks;
65
}
66

    
67
/**
68
 * Implements hook_permission().
69
 */
70
function poll_permission() {
71
  $perms = array(
72
    'vote on polls' => array(
73
      'title' => t('Vote on polls'),
74
    ),
75
    'cancel own vote' => array(
76
      'title' => t('Cancel and change own votes'),
77
    ),
78
    'inspect all votes' => array(
79
      'title' => t('View details for all votes'),
80
    ),
81
  );
82

    
83
  return $perms;
84
}
85

    
86
/**
87
 * Implements hook_menu().
88
 */
89
function poll_menu() {
90
  $items['poll'] = array(
91
    'title' => 'Polls',
92
    'page callback' => 'poll_page',
93
    'access arguments' => array('access content'),
94
    'type' => MENU_SUGGESTED_ITEM,
95
    'file' => 'poll.pages.inc',
96
  );
97

    
98
  $items['node/%node/votes'] = array(
99
    'title' => 'Votes',
100
    'page callback' => 'poll_votes',
101
    'page arguments' => array(1),
102
    'access callback' => '_poll_menu_access',
103
    'access arguments' => array(1, 'inspect all votes', FALSE),
104
    'weight' => 3,
105
    'type' => MENU_LOCAL_TASK,
106
    'file' => 'poll.pages.inc',
107
  );
108

    
109
  $items['node/%node/results'] = array(
110
    'title' => 'Results',
111
    'page callback' => 'poll_results',
112
    'page arguments' => array(1),
113
    'access callback' => '_poll_menu_access',
114
    'access arguments' => array(1, 'access content', TRUE),
115
    'weight' => 3,
116
    'type' => MENU_LOCAL_TASK,
117
    'file' => 'poll.pages.inc',
118
  );
119

    
120
  return $items;
121
}
122

    
123
/**
124
 * Callback function to see if a node is acceptable for poll menu items.
125
 */
126
function _poll_menu_access($node, $perm, $inspect_allowvotes) {
127
  return user_access($perm) && ($node->type == 'poll') && ($node->allowvotes || !$inspect_allowvotes);
128
}
129

    
130
/**
131
 * Implements hook_block_info().
132
 */
133
function poll_block_info() {
134
  $blocks['recent']['info'] = t('Most recent poll');
135
  $blocks['recent']['properties']['administrative'] = TRUE;
136
  return $blocks;
137
}
138

    
139
/**
140
 * Implements hook_block_view().
141
 *
142
 * Generates a block containing the latest poll.
143
 */
144
function poll_block_view($delta = '') {
145
  if (user_access('access content')) {
146
    // Retrieve the latest poll.
147
    $select = db_select('node', 'n');
148
    $select->join('poll', 'p', 'p.nid = n.nid');
149
    $select->fields('n', array('nid'))
150
      ->condition('n.status', 1)
151
      ->condition('p.active', 1)
152
      ->orderBy('n.created', 'DESC')
153
      ->range(0, 1)
154
      ->addTag('node_access');
155

    
156
    $record = $select->execute()->fetchObject();
157
    if ($record) {
158
      $poll = node_load($record->nid);
159
      if ($poll->nid) {
160
        $poll = poll_block_latest_poll_view($poll);
161
        $block['subject'] = t('Poll');
162
        $block['content'] = $poll->content;
163
        return $block;
164
      }
165
    }
166
  }
167
}
168

    
169
/**
170
 * Implements hook_cron().
171
 *
172
 * Closes polls that have exceeded their allowed runtime.
173
 */
174
function poll_cron() {
175
  $nids = db_query('SELECT p.nid FROM {poll} p INNER JOIN {node} n ON p.nid = n.nid WHERE (n.created + p.runtime) < :request_time AND p.active = :active AND p.runtime <> :runtime', array(':request_time' => REQUEST_TIME, ':active' => 1, ':runtime' => 0))->fetchCol();
176
  if (!empty($nids)) {
177
    db_update('poll')
178
      ->fields(array('active' => 0))
179
      ->condition('nid', $nids, 'IN')
180
      ->execute();
181
  }
182
}
183

    
184
/**
185
 * Implements hook_node_info().
186
 */
187
function poll_node_info() {
188
  return array(
189
    'poll' => array(
190
      'name' => t('Poll'),
191
      'base' => 'poll',
192
      'description' => t('A <em>poll</em> is a question with a set of possible responses. A <em>poll</em>, once created, automatically provides a simple running count of the number of votes received for each response.'),
193
      'title_label' => t('Question'),
194
    )
195
  );
196
}
197

    
198
/**
199
 * Implements hook_field_extra_fields().
200
 */
201
function poll_field_extra_fields() {
202
  $extra['node']['poll'] = array(
203
    'form' => array(
204
      'choice_wrapper' => array(
205
        'label' => t('Poll choices'),
206
        'description' => t('Poll choices'),
207
        'weight' => -4,
208
      ),
209
      'settings' => array(
210
        'label' => t('Poll settings'),
211
        'description' => t('Poll module settings'),
212
        'weight' => -3,
213
      ),
214
    ),
215
    'display' => array(
216
      'poll_view_voting' => array(
217
        'label' => t('Poll vote'),
218
        'description' => t('Poll vote'),
219
        'weight' => 0,
220
      ),
221
      'poll_view_results' => array(
222
        'label' => t('Poll results'),
223
        'description' => t('Poll results'),
224
        'weight' => 0,
225
      ),
226
    )
227
  );
228

    
229
  return $extra;
230
}
231

    
232
/**
233
 * Implements hook_form().
234
 */
235
function poll_form($node, &$form_state) {
236
  global $user;
237

    
238
  $admin = user_access('bypass node access') || user_access('edit any poll content') || (user_access('edit own poll content') && $user->uid == $node->uid);
239

    
240
  $type = node_type_get_type($node);
241

    
242
  // The submit handlers to add more poll choices require that this form is
243
  // cached, regardless of whether Ajax is used.
244
  $form_state['cache'] = TRUE;
245

    
246
  $form['title'] = array(
247
    '#type' => 'textfield',
248
    '#title' => check_plain($type->title_label),
249
    '#required' => TRUE,
250
    '#default_value' => $node->title,
251
    '#maxlength' => 255,
252
    '#weight' => -5,
253
  );
254

    
255
  if (isset($form_state['choice_count'])) {
256
    $choice_count = $form_state['choice_count'];
257
  }
258
  else {
259
    $choice_count = max(2, empty($node->choice) ? 2 : count($node->choice));
260
  }
261

    
262
  // Add a wrapper for the choices and more button.
263
  $form['choice_wrapper'] = array(
264
    '#tree' => FALSE,
265
    '#weight' => -4,
266
    '#prefix' => '<div class="clearfix" id="poll-choice-wrapper">',
267
    '#suffix' => '</div>',
268
  );
269

    
270
  // Container for just the poll choices.
271
  $form['choice_wrapper']['choice'] = array(
272
    '#prefix' => '<div id="poll-choices">',
273
    '#suffix' => '</div>',
274
    '#theme' => 'poll_choices',
275
  );
276

    
277
  // Add the current choices to the form.
278
  $delta = 0;
279
  $weight = 0;
280
  if (isset($node->choice)) {
281
    $delta = count($node->choice);
282
    foreach ($node->choice as $chid => $choice) {
283
      $key = 'chid:' . $chid;
284
      $form['choice_wrapper']['choice'][$key] = _poll_choice_form($key, $choice['chid'], $choice['chtext'], $choice['chvotes'], $choice['weight'], $choice_count);
285
      $weight = max($choice['weight'], $weight);
286
    }
287
  }
288

    
289
  // Add initial or additional choices.
290
  $existing_delta = $delta;
291
  for ($delta; $delta < $choice_count; $delta++) {
292
    $key = 'new:' . ($delta - $existing_delta);
293
    // Increase the weight of each new choice.
294
    $weight++;
295
    $form['choice_wrapper']['choice'][$key] = _poll_choice_form($key, NULL, '', 0, $weight, $choice_count);
296
  }
297

    
298
  // We name our button 'poll_more' to avoid conflicts with other modules using
299
  // Ajax-enabled buttons with the id 'more'.
300
  $form['choice_wrapper']['poll_more'] = array(
301
    '#type' => 'submit',
302
    '#value' => t('More choices'),
303
    '#attributes' => array(
304
      'title' => t("If the amount of boxes above isn't enough, click here to add more choices."),
305
    ),
306
    '#weight' => 1,
307
    '#limit_validation_errors' => array(array('choice')),
308
    '#submit' => array('poll_more_choices_submit'),
309
    '#ajax' => array(
310
      'callback' => 'poll_choice_js',
311
      'wrapper' => 'poll-choices',
312
      'effect' => 'fade',
313
    ),
314
  );
315

    
316
  // Poll attributes
317
  $duration = array(
318
    // 1-6 days.
319
    86400, 2 * 86400, 3 * 86400, 4 * 86400, 5 * 86400, 6 * 86400,
320
    // 1-3 weeks (7 days).
321
    604800, 2 * 604800, 3 * 604800,
322
    // 1-3,6,9 months (30 days).
323
    2592000, 2 * 2592000, 3 * 2592000, 6 * 2592000, 9 * 2592000,
324
    // 1 year (365 days).
325
    31536000,
326
  );
327
  $duration = array(0 => t('Unlimited')) + drupal_map_assoc($duration, 'format_interval');
328
  $active = array(0 => t('Closed'), 1 => t('Active'));
329

    
330
  $form['settings'] = array(
331
    '#type' => 'fieldset',
332
    '#collapsible' => TRUE,
333
    '#title' => t('Poll settings'),
334
    '#weight' => -3,
335
    '#access' => $admin,
336
  );
337

    
338
  $form['settings']['active'] = array(
339
    '#type' => 'radios',
340
    '#title' => t('Poll status'),
341
    '#default_value' => isset($node->active) ? $node->active : 1,
342
    '#options' => $active,
343
    '#description' => t('When a poll is closed, visitors can no longer vote for it.'),
344
    '#access' => $admin,
345
  );
346
  $form['settings']['runtime'] = array(
347
    '#type' => 'select',
348
    '#title' => t('Poll duration'),
349
    '#default_value' => isset($node->runtime) ? $node->runtime : 0,
350
    '#options' => $duration,
351
    '#description' => t('After this period, the poll will be closed automatically.'),
352
  );
353

    
354
  return $form;
355
}
356

    
357
/**
358
 * Submit handler to add more choices to a poll form.
359
 *
360
 * This handler is run regardless of whether JS is enabled or not. It makes
361
 * changes to the form state. If the button was clicked with JS disabled, then
362
 * the page is reloaded with the complete rebuilt form. If the button was
363
 * clicked with JS enabled, then ajax_form_callback() calls poll_choice_js() to
364
 * return just the changed part of the form.
365
 */
366
function poll_more_choices_submit($form, &$form_state) {
367
  // If this is a Ajax POST, add 1, otherwise add 5 more choices to the form.
368
  if ($form_state['values']['poll_more']) {
369
    $n = $_GET['q'] == 'system/ajax' ? 1 : 5;
370
    $form_state['choice_count'] = count($form_state['values']['choice']) + $n;
371
  }
372
  // Renumber the choices. This invalidates the corresponding key/value
373
  // associations in $form_state['input'], so clear that out. This requires
374
  // poll_form() to rebuild the choices with the values in
375
  // $form_state['node']->choice, which it does.
376
  $form_state['node']->choice = array_values($form_state['values']['choice']);
377
  unset($form_state['input']['choice']);
378
  $form_state['rebuild'] = TRUE;
379
}
380

    
381
function _poll_choice_form($key, $chid = NULL, $value = '', $votes = 0, $weight = 0, $size = 10) {
382
  $form = array(
383
    '#tree' => TRUE,
384
    '#weight' => $weight,
385
  );
386

    
387
  // We'll manually set the #parents property of these fields so that
388
  // their values appear in the $form_state['values']['choice'] array.
389
  $form['chid'] = array(
390
    '#type' => 'value',
391
    '#value' => $chid,
392
    '#parents' => array('choice', $key, 'chid'),
393
  );
394

    
395
  $form['chtext'] = array(
396
    '#type' => 'textfield',
397
    '#title' => $value !== '' ? t('Choice label') : t('New choice label'),
398
    '#title_display' => 'invisible',
399
    '#default_value' => $value,
400
    '#parents' => array('choice', $key, 'chtext'),
401
  );
402

    
403
  $form['chvotes'] = array(
404
    '#type' => 'textfield',
405
    '#title' => $value !== '' ? t('Vote count for choice @label', array('@label' => $value)) : t('Vote count for new choice'),
406
    '#title_display' => 'invisible',
407
    '#default_value' => $votes,
408
    '#size' => 5,
409
    '#maxlength' => 7,
410
    '#parents' => array('choice', $key, 'chvotes'),
411
    '#access' => user_access('administer nodes'),
412
    '#element_validate' => array('element_validate_integer'),
413
  );
414

    
415
  $form['weight'] = array(
416
    '#type' => 'weight',
417
    '#title' => $value !== '' ? t('Weight for choice @label', array('@label' => $value)) : t('Weight for new choice'),
418
    '#title_display' => 'invisible',
419
    '#default_value' => $weight,
420
    '#delta' => $size,
421
    '#parents' => array('choice', $key, 'weight'),
422
  );
423

    
424
  return $form;
425
}
426

    
427
/**
428
 * Ajax callback in response to new choices being added to the form.
429
 *
430
 * This returns the new page content to replace the page content made obsolete
431
 * by the form submission.
432
 *
433
 * @see poll_more_choices_submit()
434
 */
435
function poll_choice_js($form, $form_state) {
436
  return $form['choice_wrapper']['choice'];
437
}
438

    
439
/**
440
 * Form submit handler for node_form().
441
 *
442
 * Upon preview and final submission, we need to renumber poll choices and
443
 * create a teaser output.
444
 */
445
function poll_node_form_submit(&$form, &$form_state) {
446
  // Renumber choices.
447
  $form_state['values']['choice'] = array_values($form_state['values']['choice']);
448
  $form_state['values']['teaser'] = poll_teaser((object) $form_state['values']);
449
}
450

    
451
/**
452
 * Implements hook_validate().
453
 */
454
function poll_validate($node, $form) {
455
  if (isset($node->title)) {
456
    // Check for at least two options and validate amount of votes.
457
    $realchoices = 0;
458
    foreach ($node->choice as $i => $choice) {
459
      if ($choice['chtext'] != '') {
460
        $realchoices++;
461
      }
462
      if (isset($choice['chvotes']) && $choice['chvotes'] < 0) {
463
        form_set_error("choice][$i][chvotes", t('Negative values are not allowed.'));
464
      }
465
    }
466

    
467
    if ($realchoices < 2) {
468
      form_set_error("choice][$realchoices][chtext", t('You must fill in at least two choices.'));
469
    }
470
  }
471
}
472

    
473
/**
474
 * Implements hook_field_attach_prepare_translation_alter().
475
 */
476
function poll_field_attach_prepare_translation_alter(&$entity, $context) {
477
  if ($context['entity_type'] == 'node' && $entity->type == 'poll') {
478
    $entity->choice = $context['source_entity']->choice;
479
    foreach ($entity->choice as $i => $options) {
480
      $entity->choice[$i]['chvotes'] = 0;
481
    }
482
  }
483
}
484

    
485
/**
486
 * Implements hook_load().
487
 */
488
function poll_load($nodes) {
489
  global $user;
490
  foreach ($nodes as $node) {
491
    $poll = db_query("SELECT runtime, active FROM {poll} WHERE nid = :nid", array(':nid' => $node->nid))->fetchObject();
492

    
493
    if (empty($poll)) {
494
      $poll = new stdClass();
495
    }
496

    
497
    // Load the appropriate choices into the $poll object.
498
    $poll->choice = db_select('poll_choice', 'c')
499
      ->addTag('translatable')
500
      ->fields('c', array('chid', 'chtext', 'chvotes', 'weight'))
501
      ->condition('c.nid', $node->nid)
502
      ->orderBy('weight')
503
      ->execute()->fetchAllAssoc('chid', PDO::FETCH_ASSOC);
504

    
505
    // Determine whether or not this user is allowed to vote.
506
    $poll->allowvotes = FALSE;
507
    if (user_access('vote on polls') && $poll->active) {
508
      if ($user->uid) {
509
        // If authenticated, find existing vote based on uid.
510
        $poll->vote = db_query('SELECT chid FROM {poll_vote} WHERE nid = :nid AND uid = :uid', array(':nid' => $node->nid, ':uid' => $user->uid))->fetchField();
511
        if (empty($poll->vote)) {
512
          $poll->vote = -1;
513
          $poll->allowvotes = TRUE;
514
        }
515
      }
516
      elseif (!empty($_SESSION['poll_vote'][$node->nid])) {
517
        // Otherwise the user is anonymous. Look for an existing vote in the
518
        // user's session.
519
        $poll->vote = $_SESSION['poll_vote'][$node->nid];
520
      }
521
      else {
522
        // Finally, query the database for an existing vote based on anonymous
523
        // user's hostname.
524
        $poll->allowvotes = !db_query("SELECT 1 FROM {poll_vote} WHERE nid = :nid AND hostname = :hostname AND uid = 0", array(':nid' => $node->nid, ':hostname' => ip_address()))->fetchField();
525
      }
526
    }
527
    foreach ($poll as $key => $value) {
528
      $nodes[$node->nid]->$key = $value;
529
    }
530
  }
531
}
532

    
533
/**
534
 * Implements hook_insert().
535
 */
536
function poll_insert($node) {
537
  if (!user_access('administer nodes')) {
538
    // Make sure all votes are 0 initially
539
    foreach ($node->choice as $i => $choice) {
540
      $node->choice[$i]['chvotes'] = 0;
541
    }
542
    $node->active = 1;
543
  }
544

    
545
  db_insert('poll')
546
    ->fields(array(
547
      'nid' => $node->nid,
548
      'runtime' => $node->runtime,
549
      'active' => $node->active,
550
    ))
551
    ->execute();
552

    
553
  foreach ($node->choice as $choice) {
554
    if ($choice['chtext'] != '') {
555
      db_insert('poll_choice')
556
        ->fields(array(
557
          'nid' => $node->nid,
558
          'chtext' => $choice['chtext'],
559
          'chvotes' => $choice['chvotes'],
560
          'weight' => $choice['weight'],
561
        ))
562
        ->execute();
563
    }
564
  }
565
}
566

    
567
/**
568
 * Implements hook_update().
569
 */
570
function poll_update($node) {
571
  // Update poll settings.
572
  db_update('poll')
573
    ->fields(array(
574
      'runtime' => $node->runtime,
575
      'active' => $node->active,
576
    ))
577
    ->condition('nid', $node->nid)
578
    ->execute();
579

    
580
  // Poll choices with empty titles signifies removal. We remove all votes to
581
  // the removed options, so people who voted on them can vote again.
582
  foreach ($node->choice as $key => $choice) {
583
    if (!empty($choice['chtext'])) {
584
      db_merge('poll_choice')
585
        ->key(array('chid' => $choice['chid']))
586
        ->fields(array(
587
          'chtext' => $choice['chtext'],
588
          'chvotes' => (int) $choice['chvotes'],
589
          'weight' => $choice['weight'],
590
        ))
591
        ->insertFields(array(
592
          'nid' => $node->nid,
593
          'chtext' => $choice['chtext'],
594
          'chvotes' => (int) $choice['chvotes'],
595
          'weight' => $choice['weight'],
596
        ))
597
        ->execute();
598
    }
599
    else {
600
      db_delete('poll_vote')
601
        ->condition('nid', $node->nid)
602
        ->condition('chid', $key)
603
        ->execute();
604
      db_delete('poll_choice')
605
        ->condition('nid', $node->nid)
606
        ->condition('chid', $choice['chid'])
607
        ->execute();
608
    }
609
  }
610
}
611

    
612
/**
613
 * Implements hook_delete().
614
 */
615
function poll_delete($node) {
616
  db_delete('poll')
617
    ->condition('nid', $node->nid)
618
    ->execute();
619
  db_delete('poll_choice')
620
    ->condition('nid', $node->nid)
621
    ->execute();
622
  db_delete('poll_vote')
623
    ->condition('nid', $node->nid)
624
    ->execute();
625
}
626

    
627
/**
628
 * Return content for 'latest poll' block.
629
 *
630
 * @param $node
631
 *   The node object to load.
632
 */
633
function poll_block_latest_poll_view($node) {
634
  // This is necessary for shared objects because PHP doesn't copy objects, but
635
  // passes them by reference.  So when the objects are cached it can result in
636
  // the wrong output being displayed on subsequent calls.  The cloning and
637
  // unsetting of $node->content prevents the block output from being the same
638
  // as the node output.
639
  $node = clone $node;
640
  unset($node->content);
641

    
642
  // No 'read more' link.
643
  $node->readmore = FALSE;
644
  $node->teaser = '';
645

    
646
  $links = array();
647
  $links[] = array('title' => t('Older polls'), 'href' => 'poll', 'attributes' => array('title' => t('View the list of polls on this site.')));
648
  if ($node->allowvotes) {
649
    $links[] = array('title' => t('Results'), 'href' => 'node/' . $node->nid . '/results', 'attributes' => array('title' => t('View the current poll results.')));
650
  }
651

    
652
  $node->links = $links;
653

    
654
  if (!empty($node->allowvotes)) {
655
    $node->content['poll_view_voting'] = drupal_get_form('poll_view_voting', $node, TRUE);
656
    $node->content['links'] = array(
657
      '#theme' => 'links',
658
      '#links' => $node->links,
659
      '#weight' => 5,
660
    );
661
  }
662
  else {
663
    $node->content['poll_view_results'] = array('#markup' => poll_view_results($node, TRUE, TRUE));
664
  }
665

    
666
  return $node;
667
}
668

    
669

    
670
/**
671
 * Implements hook_view().
672
 */
673
function poll_view($node, $view_mode) {
674
  if (!empty($node->allowvotes) && empty($node->show_results)) {
675
    $node->content['poll_view_voting'] = drupal_get_form('poll_view_voting', $node);
676
  }
677
  else {
678
    $node->content['poll_view_results'] = array('#markup' => poll_view_results($node, $view_mode));
679
  }
680
  return $node;
681
}
682

    
683
/**
684
 * Creates a simple teaser that lists all the choices.
685
 *
686
 * This is primarily used for RSS.
687
 */
688
function poll_teaser($node) {
689
  $teaser = NULL;
690
  if (is_array($node->choice)) {
691
    foreach ($node->choice as $choice) {
692
      if ($choice['chtext'] != '') {
693
        $teaser .= '* ' . check_plain($choice['chtext']) . "\n";
694
      }
695
    }
696
  }
697
  return $teaser;
698
}
699

    
700
/**
701
 * Generates the voting form for a poll.
702
 *
703
 * @ingroup forms
704
 * @see poll_vote()
705
 * @see phptemplate_preprocess_poll_vote()
706
 */
707
function poll_view_voting($form, &$form_state, $node, $block = FALSE) {
708
  if ($node->choice) {
709
    $list = array();
710
    foreach ($node->choice as $i => $choice) {
711
      $list[$i] = check_plain($choice['chtext']);
712
    }
713
    $form['choice'] = array(
714
      '#type' => 'radios',
715
      '#title' => t('Choices'),
716
      '#title_display' => 'invisible',
717
      '#options' => $list,
718
    );
719
  }
720

    
721
  $form['vote'] = array(
722
    '#type' => 'submit',
723
    '#value' => t('Vote'),
724
    '#submit' => array('poll_vote'),
725
  );
726

    
727
  // Store the node so we can get to it in submit functions.
728
  $form['#node'] = $node;
729
  $form['#block'] = $block;
730

    
731
  // Set form caching because we could have multiple of these forms on
732
  // the same page, and we want to ensure the right one gets picked.
733
  $form_state['cache'] = TRUE;
734

    
735
  // Provide a more cleanly named voting form theme.
736
  $form['#theme'] = 'poll_vote';
737
  return $form;
738
}
739

    
740
/**
741
 * Validation function for processing votes
742
 */
743
function poll_view_voting_validate($form, &$form_state) {
744
  if (empty($form_state['values']['choice'])) {
745
    form_set_error( 'choice', t('Your vote could not be recorded because you did not select any of the choices.'));
746
  }
747
}
748

    
749
/**
750
 * Submit handler for processing a vote.
751
 */
752
function poll_vote($form, &$form_state) {
753
  $node = $form['#node'];
754
  $choice = $form_state['values']['choice'];
755

    
756
  global $user;
757
  db_insert('poll_vote')
758
    ->fields(array(
759
      'nid' => $node->nid,
760
      'chid' => $choice,
761
      'uid' => $user->uid,
762
      'hostname' => ip_address(),
763
      'timestamp' => REQUEST_TIME,
764
    ))
765
    ->execute();
766

    
767
  // Add one to the votes.
768
  db_update('poll_choice')
769
    ->expression('chvotes', 'chvotes + 1')
770
    ->condition('chid', $choice)
771
    ->execute();
772

    
773
  cache_clear_all();
774

    
775
  if (!$user->uid) {
776
    // The vote is recorded so the user gets the result view instead of the
777
    // voting form when viewing the poll. Saving a value in $_SESSION has the
778
    // convenient side effect of preventing the user from hitting the page
779
    // cache. When anonymous voting is allowed, the page cache should only
780
    // contain the voting form, not the results.
781
    $_SESSION['poll_vote'][$node->nid] = $choice;
782
  }
783

    
784
  drupal_set_message(t('Your vote was recorded.'));
785

    
786
  // Return the user to whatever page they voted from.
787
}
788

    
789
/**
790
 * Themes the voting form for a poll.
791
 *
792
 * Inputs: $form
793
 */
794
function template_preprocess_poll_vote(&$variables) {
795
  $form = $variables['form'];
796
  $variables['choice'] = drupal_render($form['choice']);
797
  $variables['title'] = check_plain($form['#node']->title);
798
  $variables['vote'] = drupal_render($form['vote']);
799
  $variables['rest'] = drupal_render_children($form);
800
  $variables['block'] = $form['#block'];
801
  if ($variables['block']) {
802
    $variables['theme_hook_suggestions'][] = 'poll_vote__block';
803
  }
804
}
805

    
806
/**
807
 * Generates a graphical representation of the results of a poll.
808
 */
809
function poll_view_results($node, $view_mode, $block = FALSE) {
810
  // Make sure that choices are ordered by their weight.
811
  uasort($node->choice, 'drupal_sort_weight');
812

    
813
  // Count the votes and find the maximum.
814
  $total_votes = 0;
815
  $max_votes = 0;
816
  foreach ($node->choice as $choice) {
817
    if (isset($choice['chvotes'])) {
818
      $total_votes += $choice['chvotes'];
819
      $max_votes = max($max_votes, $choice['chvotes']);
820
    }
821
  }
822

    
823
  $poll_results = '';
824
  foreach ($node->choice as $i => $choice) {
825
    if (!empty($choice['chtext'])) {
826
      $chvotes = isset($choice['chvotes']) ? $choice['chvotes'] : NULL;
827
      $poll_results .= theme('poll_bar', array('title' => $choice['chtext'], 'votes' => $chvotes, 'total_votes' => $total_votes, 'vote' => isset($node->vote) && $node->vote == $i, 'block' => $block));
828
    }
829
  }
830

    
831
  return theme('poll_results', array('raw_title' => $node->title, 'results' => $poll_results, 'votes' => $total_votes, 'raw_links' => isset($node->links) ? $node->links : array(), 'block' => $block, 'nid' => $node->nid, 'vote' => isset($node->vote) ? $node->vote : NULL));
832
}
833

    
834

    
835
/**
836
 * Returns HTML for an admin poll form for choices.
837
 *
838
 * @param $variables
839
 *   An associative array containing:
840
 *   - form: A render element representing the form.
841
 *
842
 * @ingroup themeable
843
 */
844
function theme_poll_choices($variables) {
845
  $form = $variables['form'];
846

    
847
  drupal_add_tabledrag('poll-choice-table', 'order', 'sibling', 'poll-weight');
848

    
849
  $is_admin= user_access('administer nodes');
850
  $delta = 0;
851
  $rows = array();
852
  $headers = array('', t('Choice'));
853
  if ($is_admin) {
854
    $headers[] = t('Vote count');
855
  }
856
  $headers[] = t('Weight');
857

    
858
  foreach (element_children($form) as $key) {
859
    $delta++;
860
    // Set special classes for drag and drop updating.
861
    $form[$key]['weight']['#attributes']['class'] = array('poll-weight');
862

    
863
    // Build the table row.
864
    $row = array(
865
      'data' => array(
866
        array('class' => array('choice-flag')),
867
        drupal_render($form[$key]['chtext']),
868
      ),
869
      'class' => array('draggable'),
870
    );
871
    if ($is_admin) {
872
      $row['data'][] = drupal_render($form[$key]['chvotes']);
873
    }
874
    $row['data'][] = drupal_render($form[$key]['weight']);
875

    
876
    // Add any additional classes set on the row.
877
    if (!empty($form[$key]['#attributes']['class'])) {
878
      $row['class'] = array_merge($row['class'], $form[$key]['#attributes']['class']);
879
    }
880

    
881
    $rows[] = $row;
882
  }
883

    
884
  $output = theme('table', array('header' => $headers, 'rows' => $rows, 'attributes' => array('id' => 'poll-choice-table')));
885
  $output .= drupal_render_children($form);
886
  return $output;
887
}
888

    
889
/**
890
 * Preprocess the poll_results theme hook.
891
 *
892
 * Inputs: $raw_title, $results, $votes, $raw_links, $block, $nid, $vote. The
893
 * $raw_* inputs to this are naturally unsafe; often safe versions are
894
 * made to simply overwrite the raw version, but in this case it seems likely
895
 * that the title and the links may be overridden by the theme layer, so they
896
 * are left in with a different name for that purpose.
897
 *
898
 * @see poll-results.tpl.php
899
 * @see poll-results--block.tpl.php
900
 */
901
function template_preprocess_poll_results(&$variables) {
902
  $variables['links'] = theme('links__poll_results', array('links' => $variables['raw_links']));
903
  if (isset($variables['vote']) && $variables['vote'] > -1 && user_access('cancel own vote')) {
904
    $elements = drupal_get_form('poll_cancel_form', $variables['nid']);
905
    $variables['cancel_form'] = drupal_render($elements);
906
  }
907
  $variables['title'] = check_plain($variables['raw_title']);
908

    
909
  if ($variables['block']) {
910
    $variables['theme_hook_suggestions'][] = 'poll_results__block';
911
  }
912
}
913

    
914
/**
915
 * Preprocess the poll_bar theme hook.
916
 *
917
 * Inputs: $title, $votes, $total_votes, $voted, $block
918
 *
919
 * @see poll-bar.tpl.php
920
 * @see poll-bar--block.tpl.php
921
 */
922
function template_preprocess_poll_bar(&$variables) {
923
  if ($variables['block']) {
924
    $variables['theme_hook_suggestions'][] = 'poll_bar__block';
925
  }
926
  $variables['title'] = check_plain($variables['title']);
927
  $variables['percentage'] = round($variables['votes'] * 100 / max($variables['total_votes'], 1));
928
}
929

    
930
/**
931
 * Builds the cancel form for a poll.
932
 *
933
 * @ingroup forms
934
 * @see poll_cancel()
935
 */
936
function poll_cancel_form($form, &$form_state, $nid) {
937
  $form_state['cache'] = TRUE;
938

    
939
  // Store the nid so we can get to it in submit functions.
940
  $form['#nid'] = $nid;
941

    
942
  $form['actions'] = array('#type' => 'actions');
943
  $form['actions']['submit'] = array(
944
    '#type' => 'submit',
945
    '#value' => t('Cancel your vote'),
946
    '#submit' => array('poll_cancel')
947
  );
948

    
949
  return $form;
950
}
951

    
952
/**
953
 * Submit callback for poll_cancel_form().
954
 */
955
function poll_cancel($form, &$form_state) {
956
  global $user;
957
  $node = node_load($form['#nid']);
958

    
959
  db_delete('poll_vote')
960
    ->condition('nid', $node->nid)
961
    ->condition($user->uid ? 'uid' : 'hostname', $user->uid ? $user->uid : ip_address())
962
    ->execute();
963

    
964
  // Subtract from the votes.
965
  db_update('poll_choice')
966
    ->expression('chvotes', 'chvotes - 1')
967
    ->condition('chid', $node->vote)
968
    ->execute();
969

    
970
  unset($_SESSION['poll_vote'][$node->nid]);
971

    
972
  drupal_set_message(t('Your vote was cancelled.'));
973
}
974

    
975
/**
976
 * Implements hook_user_cancel().
977
 */
978
function poll_user_cancel($edit, $account, $method) {
979
  switch ($method) {
980
    case 'user_cancel_reassign':
981
      db_update('poll_vote')
982
        ->fields(array('uid' => 0))
983
        ->condition('uid', $account->uid)
984
        ->execute();
985
      break;
986
  }
987
}
988

    
989
/**
990
 * Implements hook_user_delete().
991
 */
992
function poll_user_delete($account) {
993
  db_delete('poll_vote')
994
    ->condition('uid', $account->uid)
995
    ->execute();
996
}
997

    
998
/**
999
 * Implements hook_rdf_mapping().
1000
 */
1001
function poll_rdf_mapping() {
1002
  return array(
1003
    array(
1004
      'type' => 'node',
1005
      'bundle' => 'poll',
1006
      'mapping' => array(
1007
        'rdftype' => array('sioc:Post', 'sioct:Poll'),
1008
      ),
1009
    ),
1010
  );
1011
}