MDL-35792 question preview: way to update options without restarting.

It is useful, and possible, to update the display options without
restarting the question. You now only have to restart if you are
changing the maximum mark or the behaviour.

lang/en/question.php

@@ -306,6 +306,8 @@
 $string['cannotpreview'] = 'You can\'t preview these questions!';
 $string['category'] = 'Category';
 $string['changeoptions'] = 'Change options';
+$string['attemptoptions'] = 'Attempt options';
+$string['displayoptions'] = 'Display options';
 $string['check'] = 'Check';
 $string['clearwrongparts'] = 'Clear incorrect responses';
 $string['closepreview'] = 'Close preview';
@@ -384,6 +386,7 @@
 $string['responsehistory'] = 'Response history';
 $string['restart'] = 'Start again';
 $string['restartwiththeseoptions'] = 'Start again with these options';
+$string['updatedisplayoptions'] = 'Update display options';
 $string['rightanswer'] = 'Right answer';
 $string['rightanswer_help'] = 'an automatically generated summary of the correct response. This can be limited, so you may wish to consider explaining the correct solution in the general feedback for the question, and turning this option off.';
 $string['saved'] = 'Saved: {$a}';

question/preview.php

@@ -124,7 +124,7 @@
 $options->maxmark = $quba->get_question_max_mark($slot);
 
 // Create the settings form, and initialise the fields.
-$optionsform = new preview_options_form(question_preview_form_url($question->id, $context),
+$optionsform = new preview_options_form(question_preview_form_url($question->id, $context, $previewid),
         array('quba' => $quba, 'maxvariant' => $maxvariant));
 $optionsform->set_data($options);
 
@@ -135,7 +135,9 @@
     if (!isset($newoptions->variant)) {
         $newoptions->variant = $options->variant;
     }
-    restart_preview($previewid, $question->id, $newoptions, $context);
+    if (isset($newoptions->saverestart)) {
+        restart_preview($previewid, $question->id, $newoptions, $context);
+    }
 }
 
 // Prepare a URL that is used in various places.

question/previewlib.php

@@ -44,7 +44,7 @@ public function definition() {
             question_display_options::VISIBLE => get_string('shown', 'question'),
         );
 
-        $mform->addElement('header', 'optionsheader', get_string('changeoptions', 'question'));
+        $mform->addElement('header', 'optionsheader', get_string('attemptoptions', 'question'));
 
         $behaviours = question_engine::get_behaviour_options(
                 $this->_customdata['quba']->get_preferred_behaviour());
@@ -56,6 +56,11 @@ public function definition() {
                 array('size' => '5'));
         $mform->setType('maxmark', PARAM_FLOAT);
 
+        $mform->addElement('submit', 'saverestart',
+                get_string('restartwiththeseoptions', 'question'));
+
+        $mform->addElement('header', 'optionsheader', get_string('displayoptions', 'question'));
+
         if ($this->_customdata['maxvariant'] > 1) {
             $variants = range(1, $this->_customdata['maxvariant']);
             $mform->addElement('select', 'variant', get_string('questionvariant', 'question'),
@@ -88,8 +93,8 @@ public function definition() {
         $mform->addElement('select', 'history',
                 get_string('responsehistory', 'question'), $hiddenofvisible);
 
-        $mform->addElement('submit', 'submit',
-                get_string('restartwiththeseoptions', 'question'));
+        $mform->addElement('submit', 'saveupdate',
+                get_string('updatedisplayoptions', 'question'));
     }
 }
 
@@ -286,10 +291,10 @@ function question_preview_action_url($questionid, $qubaid,
 /**
  * The the URL to use for actions relating to this preview.
  * @param int $questionid the question being previewed.
- * @param int $qubaid the id of the question usage for this preview.
- * @param question_preview_options $options the options in use.
+ * @param context $context the current moodle context.
+ * @param int $previewid optional previewid to sign post saved previewed answers.
  */
-function question_preview_form_url($questionid, $context) {
+function question_preview_form_url($questionid, $context, $previewid = null) {
     $params = array(
         'id' => $questionid,
     );
@@ -298,6 +303,9 @@ function question_preview_form_url($questionid, $context) {
     } else if ($context->contextlevel == CONTEXT_COURSE) {
         $params['courseid'] = $context->instanceid;
     }
+    if ($previewid) {
+        $params['previewid'] = $previewid;
+    }
     return new moodle_url('/question/preview.php', $params);
 }