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640 lines
22 KiB
640 lines
22 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Classes for displaying and editing a nested list of items.
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*
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* Handles functionality for :
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*
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* Construction of nested list from db records with some key pointing to a parent id.
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* Display of list with or without editing icons with optional pagination.
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* Reordering of items works across pages.
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* Processing of editing actions on list.
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*
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* @package core
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* @subpackage lib
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* @copyright Jamie Pratt
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* Clues to reading this code:
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*
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* The functions that move things around the tree structure just update the
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* database - they don't update the in-memory structure, instead they trigger a
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* page reload so everything is rebuilt from scratch.
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*
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* @package moodlecore
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* @copyright Jamie Pratt
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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abstract class moodle_list {
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public $attributes;
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public $listitemclassname = 'list_item';
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/** @var array of $listitemclassname objects. */
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public $items = array();
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/** @var string 'ol' or 'ul'. */
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public $type;
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/** @var list_item or derived class. */
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public $parentitem = null;
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public $table;
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public $fieldnamesparent = 'parent';
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/** @var array Records from db, only used in top level list. */
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public $records = array();
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public $editable;
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/** @var array keys are child ids, values are parents. */
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public $childparent;
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//------------------------------------------------------
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//vars used for pagination.
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public $page = 0; // 0 means no pagination
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public $firstitem = 1;
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public $lastitem = 999999;
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public $pagecount;
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public $paged = false;
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public $offset = 0;
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//------------------------------------------------------
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public $pageurl;
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public $pageparamname;
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/**
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* Constructor.
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*
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* @param string $type
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* @param string $attributes
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* @param boolean $editable
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* @param moodle_url $pageurl url for this page
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* @param integer $page if 0 no pagination. (These three params only used in top level list.)
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* @param string $pageparamname name of url param that is used for passing page no
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* @param integer $itemsperpage no of top level items.
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*/
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public function __construct($type='ul', $attributes='', $editable = false, $pageurl=null, $page = 0, $pageparamname = 'page', $itemsperpage = 20) {
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global $PAGE;
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$this->editable = $editable;
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$this->attributes = $attributes;
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$this->type = $type;
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$this->page = $page;
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$this->pageparamname = $pageparamname;
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$this->itemsperpage = $itemsperpage;
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if ($pageurl === null) {
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$this->pageurl = new moodle_url($PAGE->url);
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$this->pageurl->params(array($this->pageparamname => $this->page));
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} else {
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$this->pageurl = $pageurl;
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}
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}
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/**
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* Returns html string.
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*
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* @param integer $indent depth of indentation.
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*/
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public function to_html($indent=0, $extraargs=array()) {
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if (count($this->items)) {
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$tabs = str_repeat("\t", $indent);
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$first = true;
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$itemiter = 1;
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$lastitem = '';
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$html = '';
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foreach ($this->items as $item) {
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$last = (count($this->items) == $itemiter);
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if ($this->editable) {
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$item->set_icon_html($first, $last, $lastitem);
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}
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if ($itemhtml = $item->to_html($indent+1, $extraargs)) {
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$html .= "$tabs\t<li".((!empty($item->attributes))?(' '.$item->attributes):'').">";
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$html .= $itemhtml;
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$html .= "</li>\n";
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}
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$first = false;
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$lastitem = $item;
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$itemiter++;
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}
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} else {
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$html = '';
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}
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if ($html) { //if there are list items to display then wrap them in ul / ol tag.
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$tabs = str_repeat("\t", $indent);
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$html = $tabs.'<'.$this->type.((!empty($this->attributes))?(' '.$this->attributes):'').">\n".$html;
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$html .= $tabs."</".$this->type.">\n";
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} else {
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$html ='';
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}
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return $html;
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}
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/**
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* Recurse down the tree and find an item by it's id.
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*
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* @param integer $id
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* @param boolean $suppresserror error if not item found?
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* @return list_item *copy* or null if item is not found
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*/
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public function find_item($id, $suppresserror = false) {
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if (isset($this->items)) {
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foreach ($this->items as $key => $child) {
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if ($child->id == $id) {
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return $this->items[$key];
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}
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}
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foreach (array_keys($this->items) as $key) {
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$thischild = $this->items[$key];
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$ref = $thischild->children->find_item($id, true);//error always reported at top level
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if ($ref !== null) {
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return $ref;
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}
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}
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}
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if (!$suppresserror) {
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print_error('listnoitem');
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}
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return null;
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}
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public function add_item($item) {
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$this->items[] = $item;
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}
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public function set_parent($parent) {
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$this->parentitem = $parent;
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}
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/**
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* Produces a hierarchical tree of list items from a flat array of records.
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* 'parent' field is expected to point to a parent record.
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* records are already sorted.
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* If the parent field doesn't point to another record in the array then this is
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* a top level list
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*
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* @param integer $offset how many list toplevel items are there in lists before this one
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* @return array(boolean, integer) whether there is more than one page, $offset + how many toplevel items where there in this list.
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*
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*/
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public function list_from_records($paged = false, $offset = 0) {
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$this->paged = $paged;
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$this->offset = $offset;
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$this->get_records();
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$records = $this->records;
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$page = $this->page;
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if (!empty($page)) {
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$this->firstitem = ($page - 1) * $this->itemsperpage;
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$this->lastitem = $this->firstitem + $this->itemsperpage - 1;
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}
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$itemiter = $offset;
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//make a simple array which is easier to search
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$this->childparent = array();
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foreach ($records as $record) {
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$this->childparent[$record->id] = $record->parent;
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}
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//create top level list items and they're responsible for creating their children
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foreach ($records as $record) {
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if (array_key_exists($record->parent, $this->childparent)) {
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// This record is a child of another record, so it will be dealt
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// with by a call to list_item::create_children, not here.
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continue;
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}
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$inpage = $itemiter >= $this->firstitem && $itemiter <= $this->lastitem;
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// Make list item for top level for all items
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// we need the info about the top level items for reordering peers.
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if ($this->parentitem !== null) {
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$newattributes = $this->parentitem->attributes;
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} else {
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$newattributes = '';
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}
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$this->items[$itemiter] = new $this->listitemclassname($record, $this, $newattributes, $inpage);
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if ($inpage) {
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$this->items[$itemiter]->create_children($records, $this->childparent, $record->id);
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} else {
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// Don't recurse down the tree for items that are not on this page
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$this->paged = true;
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}
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$itemiter++;
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}
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return array($this->paged, $itemiter);
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}
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/**
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* Should be overriden to return an array of records of list items.
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*/
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public abstract function get_records();
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/**
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* display list of page numbers for navigation
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*/
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public function display_page_numbers() {
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$html = '';
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$topcount = count($this->items);
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$this->pagecount = (integer) ceil(($topcount + $this->offset)/ QUESTION_PAGE_LENGTH );
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if (!empty($this->page) && ($this->paged)) {
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$html = "<div class=\"paging\">".get_string('page').":\n";
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foreach (range(1,$this->pagecount) as $currentpage) {
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if ($this->page == $currentpage) {
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$html .= " $currentpage \n";
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}
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else {
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$html .= "<a href=\"".$this->pageurl->out(true, array($this->pageparamname => $currentpage))."\">";
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$html .= " $currentpage </a>\n";
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}
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}
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$html .= "</div>";
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}
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return $html;
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}
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/**
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* Returns an array of ids of peers of an item.
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*
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* @param int itemid - if given, restrict records to those with this parent id.
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* @return array peer ids
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*/
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public function get_items_peers($itemid) {
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$itemref = $this->find_item($itemid);
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$peerids = $itemref->parentlist->get_child_ids();
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return $peerids;
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}
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/**
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* Returns an array of ids of child items.
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*
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* @return array peer ids
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*/
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public function get_child_ids() {
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$childids = array();
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foreach ($this->items as $child) {
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$childids[] = $child->id;
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}
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return $childids;
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}
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/**
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* Returns the value to be used as the parent for the $item when it goes to the top level.
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* Override if needed.
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*
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* @param list_item $item The item which its top level parent is going to be returned.
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* @return int
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*/
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public function get_top_level_parent_id($item) {
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return 0; // Top level items have no parent.
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}
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/**
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* Move a record up or down
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*
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* @param string $direction up / down
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* @param integer $id
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*/
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public function move_item_up_down($direction, $id) {
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$peers = $this->get_items_peers($id);
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$itemkey = array_search($id, $peers);
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switch ($direction) {
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case 'down' :
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if (isset($peers[$itemkey+1])) {
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$olditem = $peers[$itemkey+1];
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$peers[$itemkey+1] = $id;
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$peers[$itemkey] = $olditem;
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} else {
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print_error('listcantmoveup');
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}
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break;
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case 'up' :
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if (isset($peers[$itemkey-1])) {
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$olditem = $peers[$itemkey-1];
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$peers[$itemkey-1] = $id;
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$peers[$itemkey] = $olditem;
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} else {
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print_error('listcantmovedown');
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}
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break;
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}
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$this->reorder_peers($peers);
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}
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public function reorder_peers($peers) {
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global $DB;
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foreach ($peers as $key => $peer) {
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$DB->set_field($this->table, "sortorder", $key, array("id"=>$peer));
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}
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}
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/**
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* Moves the item one step up in the tree.
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*
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* @param int $id an item index.
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* @return list_item the item that used to be the parent of the item moved.
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*/
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public function move_item_left($id) {
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global $DB;
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$item = $this->find_item($id);
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if (!isset($item->parentlist->parentitem->parentlist)) {
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print_error('listcantmoveleft');
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} else {
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$newpeers = $this->get_items_peers($item->parentlist->parentitem->id);
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if (isset($item->parentlist->parentitem->parentlist->parentitem)) {
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$newparent = $item->parentlist->parentitem->parentlist->parentitem->id;
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} else {
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$newparent = $this->get_top_level_parent_id($item);
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}
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$DB->set_field($this->table, "parent", $newparent, array("id"=>$item->id));
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$oldparentkey = array_search($item->parentlist->parentitem->id, $newpeers);
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$neworder = array_merge(array_slice($newpeers, 0, $oldparentkey+1), array($item->id), array_slice($newpeers, $oldparentkey+1));
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$this->reorder_peers($neworder);
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}
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return $item->parentlist->parentitem;
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}
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/**
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* Make item with id $id the child of the peer that is just above it in the sort order.
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*
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* @param integer $id
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*/
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public function move_item_right($id) {
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global $DB;
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$peers = $this->get_items_peers($id);
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$itemkey = array_search($id, $peers);
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if (!isset($peers[$itemkey-1])) {
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print_error('listcantmoveright');
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} else {
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$DB->set_field($this->table, "parent", $peers[$itemkey-1], array("id"=>$peers[$itemkey]));
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$newparent = $this->find_item($peers[$itemkey-1]);
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if (isset($newparent->children)) {
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$newpeers = $newparent->children->get_child_ids();
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}
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if ($newpeers) {
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$newpeers[] = $peers[$itemkey];
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$this->reorder_peers($newpeers);
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}
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}
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}
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/**
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* process any actions.
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*
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* @param integer $left id of item to move left
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* @param integer $right id of item to move right
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* @param integer $moveup id of item to move up
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* @param integer $movedown id of item to move down
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* @return unknown
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*/
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public function process_actions($left, $right, $moveup, $movedown) {
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//should this action be processed by this list object?
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if (!(array_key_exists($left, $this->records) || array_key_exists($right, $this->records) || array_key_exists($moveup, $this->records) || array_key_exists($movedown, $this->records))) {
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return false;
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}
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if (!empty($left)) {
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$oldparentitem = $this->move_item_left($left);
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if ($this->item_is_last_on_page($oldparentitem->id)) {
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// Item has jumped onto the next page, change page when we redirect.
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$this->page ++;
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$this->pageurl->params(array($this->pageparamname => $this->page));
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}
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} else if (!empty($right)) {
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$this->move_item_right($right);
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if ($this->item_is_first_on_page($right)) {
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// Item has jumped onto the previous page, change page when we redirect.
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$this->page --;
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$this->pageurl->params(array($this->pageparamname => $this->page));
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}
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} else if (!empty($moveup)) {
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$this->move_item_up_down('up', $moveup);
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if ($this->item_is_first_on_page($moveup)) {
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// Item has jumped onto the previous page, change page when we redirect.
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$this->page --;
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$this->pageurl->params(array($this->pageparamname => $this->page));
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}
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} else if (!empty($movedown)) {
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$this->move_item_up_down('down', $movedown);
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if ($this->item_is_last_on_page($movedown)) {
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// Item has jumped onto the next page, change page when we redirect.
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$this->page ++;
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$this->pageurl->params(array($this->pageparamname => $this->page));
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}
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} else {
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return false;
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}
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redirect($this->pageurl);
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}
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/**
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* @param integer $itemid an item id.
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* @return boolean Is the item with the given id the first top-level item on
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* the current page?
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*/
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public function item_is_first_on_page($itemid) {
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return $this->page && isset($this->items[$this->firstitem]) &&
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$itemid == $this->items[$this->firstitem]->id;
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}
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/**
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* @param integer $itemid an item id.
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* @return boolean Is the item with the given id the last top-level item on
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* the current page?
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*/
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public function item_is_last_on_page($itemid) {
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return $this->page && isset($this->items[$this->lastitem]) &&
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$itemid == $this->items[$this->lastitem]->id;
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}
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}
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/**
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* @package moodlecore
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* @copyright Jamie Pratt
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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abstract class list_item {
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/** @var integer id of record, used if list is editable. */
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public $id;
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/** @var string name of this item, used if list is editable. */
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public $name;
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/** @var mixed The object or string representing this item. */
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public $item;
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public $fieldnamesname = 'name';
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public $attributes;
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public $display;
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public $icons = array();
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/** @var moodle_list */
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public $parentlist;
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/** @var moodle_list Set if there are any children of this listitem. */
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public $children;
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/**
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* Constructor
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* @param mixed $item fragment of html for list item or record
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* @param object $parent reference to parent of this item
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* @param string $attributes attributes for li tag
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* @param boolean $display whether this item is displayed. Some items may be loaded so we have a complete
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* structure in memory to work with for actions but are not displayed.
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* @return list_item
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*/
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public function __construct($item, $parent, $attributes = '', $display = true) {
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$this->item = $item;
|
|
if (is_object($this->item)) {
|
|
$this->id = $this->item->id;
|
|
$this->name = $this->item->{$this->fieldnamesname};
|
|
}
|
|
$this->set_parent($parent);
|
|
$this->attributes = $attributes;
|
|
$parentlistclass = get_class($parent);
|
|
$this->children = new $parentlistclass($parent->type, $parent->attributes, $parent->editable, $parent->pageurl, 0);
|
|
$this->children->set_parent($this);
|
|
$this->display = $display;
|
|
}
|
|
|
|
/**
|
|
* Output the html just for this item. Called by to_html which adds html for children.
|
|
*
|
|
*/
|
|
public function item_html($extraargs = array()) {
|
|
if (is_string($this->item)) {
|
|
$html = $this->item;
|
|
} elseif (is_object($this->item)) {
|
|
//for debug purposes only. You should create a sub class to
|
|
//properly handle the record
|
|
$html = join(', ', (array)$this->item);
|
|
}
|
|
return $html;
|
|
}
|
|
|
|
/**
|
|
* Returns html
|
|
*
|
|
* @param integer $indent
|
|
* @param array $extraargs any extra data that is needed to print the list item
|
|
* may be used by sub class.
|
|
* @return string html
|
|
*/
|
|
public function to_html($indent = 0, $extraargs = array()) {
|
|
if (!$this->display) {
|
|
return '';
|
|
}
|
|
$tabs = str_repeat("\t", $indent);
|
|
|
|
if (isset($this->children)) {
|
|
$childrenhtml = $this->children->to_html($indent+1, $extraargs);
|
|
} else {
|
|
$childrenhtml = '';
|
|
}
|
|
return $this->item_html($extraargs).' '.(join($this->icons, '')).(($childrenhtml !='')?("\n".$childrenhtml):'');
|
|
}
|
|
|
|
public function set_icon_html($first, $last, $lastitem) {
|
|
global $CFG;
|
|
$strmoveup = get_string('moveup');
|
|
$strmovedown = get_string('movedown');
|
|
$strmoveleft = get_string('maketoplevelitem', 'question');
|
|
|
|
if (right_to_left()) { // Exchange arrows on RTL
|
|
$rightarrow = 'left';
|
|
$leftarrow = 'right';
|
|
} else {
|
|
$rightarrow = 'right';
|
|
$leftarrow = 'left';
|
|
}
|
|
|
|
if (isset($this->parentlist->parentitem)) {
|
|
$parentitem = $this->parentlist->parentitem;
|
|
if (isset($parentitem->parentlist->parentitem)) {
|
|
$action = get_string('makechildof', 'question', $parentitem->parentlist->parentitem->name);
|
|
} else {
|
|
$action = $strmoveleft;
|
|
}
|
|
$url = new moodle_url($this->parentlist->pageurl, (array('sesskey'=>sesskey(), 'left'=>$this->id)));
|
|
$this->icons['left'] = $this->image_icon($action, $url, $leftarrow);
|
|
} else {
|
|
$this->icons['left'] = $this->image_spacer();
|
|
}
|
|
|
|
if (!$first) {
|
|
$url = new moodle_url($this->parentlist->pageurl, (array('sesskey'=>sesskey(), 'moveup'=>$this->id)));
|
|
$this->icons['up'] = $this->image_icon($strmoveup, $url, 'up');
|
|
} else {
|
|
$this->icons['up'] = $this->image_spacer();
|
|
}
|
|
|
|
if (!$last) {
|
|
$url = new moodle_url($this->parentlist->pageurl, (array('sesskey'=>sesskey(), 'movedown'=>$this->id)));
|
|
$this->icons['down'] = $this->image_icon($strmovedown, $url, 'down');
|
|
} else {
|
|
$this->icons['down'] = $this->image_spacer();
|
|
}
|
|
|
|
if (!empty($lastitem)) {
|
|
$makechildof = get_string('makechildof', 'question', $lastitem->name);
|
|
$url = new moodle_url($this->parentlist->pageurl, (array('sesskey'=>sesskey(), 'right'=>$this->id)));
|
|
$this->icons['right'] = $this->image_icon($makechildof, $url, $rightarrow);
|
|
} else {
|
|
$this->icons['right'] = $this->image_spacer();
|
|
}
|
|
}
|
|
|
|
public function image_icon($action, $url, $icon) {
|
|
global $OUTPUT;
|
|
return '<a title="' . s($action) .'" href="'.$url.'">' .
|
|
$OUTPUT->pix_icon('t/' . $icon, $action) . '</a> ';
|
|
}
|
|
|
|
public function image_spacer() {
|
|
global $OUTPUT;
|
|
return $OUTPUT->spacer();
|
|
}
|
|
|
|
/**
|
|
* Recurse down tree creating list_items, called from moodle_list::list_from_records
|
|
*
|
|
* @param array $records
|
|
* @param array $children
|
|
* @param integer $thisrecordid
|
|
*/
|
|
public function create_children(&$records, &$children, $thisrecordid) {
|
|
//keys where value is $thisrecordid
|
|
$thischildren = array_keys($children, $thisrecordid);
|
|
foreach ($thischildren as $child) {
|
|
$thisclass = get_class($this);
|
|
$newlistitem = new $thisclass($records[$child], $this->children, $this->attributes);
|
|
$this->children->add_item($newlistitem);
|
|
$newlistitem->create_children($records, $children, $records[$child]->id);
|
|
}
|
|
}
|
|
|
|
public function set_parent($parent) {
|
|
$this->parentlist = $parent;
|
|
}
|
|
}
|
|
|