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. /** * Defines the quiz repaginate class. * * @package mod_quiz * @copyright 2014 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace mod_quiz; defined('MOODLE_INTERNAL') || die(); /** * The repaginate class will rearrange questions in pages. * * The quiz setting allows users to write quizzes with one question per page, * n questions per page, or all questions on one page. * * @copyright 2014 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class repaginate { /** @var int means join pages. */ const LINK = 1; /** @var int means split pages. */ const UNLINK = 2; /** @var int the id of the quiz being manipulated. */ private $quizid; /** @var array the quiz_slots for that quiz. */ private $slots; /** * Constructor. * @param int $quizid the id of the quiz being manipulated. * @param stdClass[] $slots the quiz_slots for that quiz. */ public function __construct($quizid = 0, $slots = null) { global $DB; $this->quizid = $quizid; if (!$this->quizid) { $this->slots = array(); } if (!$slots) { $this->slots = $DB->get_records('quiz_slots', array('quizid' => $this->quizid), 'slot'); } else { $this->slots = $slots; } } /** * Repaginate a given slot with the given pagenumber. * @param stdClass $slot * @param int $newpagenumber * @return stdClass */ protected function repaginate_this_slot($slot, $newpagenumber) { $newslot = clone($slot); $newslot->page = $newpagenumber; return $newslot; } /** * Return current slot object. * @param array $slots * @param int $slotnumber * @return stdClass $slot */ protected function get_this_slot($slots, $slotnumber) { foreach ($slots as $key => $slot) { if ($slot->slot == $slotnumber) { return $slot; } } return null; } /** * Return array of slots with slot number as key * @param stdClass[] $slots * @return stdClass[] */ protected function get_slots_by_slot_number($slots) { if (!$slots) { return array(); } $newslots = array(); foreach ($slots as $slot) { $newslots[$slot->slot] = $slot; } return $newslots; } /** * Return array of slots with slot id as key * @param stdClass[] $slots * @return stdClass[] */ protected function get_slots_by_slotid($slots) { if (!$slots) { return array(); } $newslots = array(); foreach ($slots as $slot) { $newslots[$slot->id] = $slot; } return $newslots; } /** * Repaginate, update DB and slots object * @param int $nextslotnumber * @param int $type repaginate::LINK or repaginate::UNLINK. */ public function repaginate_slots($nextslotnumber, $type) { global $DB; $this->slots = $DB->get_records('quiz_slots', array('quizid' => $this->quizid), 'slot'); $nextslot = null; $newslots = array(); foreach ($this->slots as $slot) { if ($slot->slot < $nextslotnumber) { $newslots[$slot->id] = $slot; } else if ($slot->slot == $nextslotnumber) { $nextslot = $this->repaginate_next_slot($nextslotnumber, $type); // Update DB. $DB->update_record('quiz_slots', $nextslot, true); // Update returning object. $newslots[$slot->id] = $nextslot; } } if ($nextslot) { $newslots = array_merge($newslots, $this->repaginate_the_rest($this->slots, $nextslotnumber, $type)); $this->slots = $this->get_slots_by_slotid($newslots); } } /** * Repaginate next slot and return the modified slot object * @param int $nextslotnumber * @param int $type repaginate::LINK or repaginate::UNLINK. * @return stdClass|null */ public function repaginate_next_slot($nextslotnumber, $type) { $currentslotnumber = $nextslotnumber - 1; if (!($currentslotnumber && $nextslotnumber)) { return null; } $currentslot = $this->get_this_slot($this->slots, $currentslotnumber); $nextslot = $this->get_this_slot($this->slots, $nextslotnumber); if ($type === self::LINK) { return $this->repaginate_this_slot($nextslot, $currentslot->page); } else if ($type === self::UNLINK) { return $this->repaginate_this_slot($nextslot, $nextslot->page + 1); } return null; } /** * Return the slots with the new pagination, regardless of current pagination. * @param stdClass[] $slots the slots to repaginate. * @param int $number number of question per page * @return stdClass[] the updated slots. */ public function repaginate_n_question_per_page($slots, $number) { $slots = $this->get_slots_by_slot_number($slots); $newslots = array(); $count = 0; $page = 1; foreach ($slots as $key => $slot) { for ($page + $count; $page < ($number + $count + 1); $page++) { if ($slot->slot >= $page) { $slot->page = $page; $count++; } } $newslots[$slot->id] = $slot; } return $newslots; } /** * Repaginate the rest. * @param stdClass[] $quizslots * @param int $slotfrom * @param int $type * @param bool $dbupdate * @return stdClass[] */ public function repaginate_the_rest($quizslots, $slotfrom, $type, $dbupdate = true) { global $DB; if (!$quizslots) { return null; } $newslots = array(); foreach ($quizslots as $slot) { if ($type == self::LINK) { if ($slot->slot <= $slotfrom) { continue; } $slot->page = $slot->page - 1; } else if ($type == self::UNLINK) { if ($slot->slot <= $slotfrom - 1) { continue; } $slot->page = $slot->page + 1; } // Update DB. if ($dbupdate) { $DB->update_record('quiz_slots', $slot); } $newslots[$slot->id] = $slot; } return $newslots; } }