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File: listlib.php
<?php // $Id: listlib.php,v 1.14.2.1 2008/11/27 10:53:40 tjhunt Exp $ /////////////////////////////////////////////////////////////////////////// // // // NOTICE OF COPYRIGHT // // // // Moodle - Modular Object-Oriented Dynamic Learning Environment // // http://moodle.com // // // // Copyright (C) 1999 onwards Martin Dougiamas http://dougiamas.com // // // // This program is free software; you can redistribute it and/or modify // // it under the terms of the GNU General Public License as published by // // the Free Software Foundation; either version 2 of the License, or // // (at your option) any later version. // // // // This program is distributed in the hope that it will be useful, // // but WITHOUT ANY WARRANTY; without even the implied warranty of // // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // // GNU General Public License for more details: // // // // http://www.gnu.org/copyleft/gpl.html // // // /////////////////////////////////////////////////////////////////////////// /** * Classes for displaying and editing a nested list of items. * * Handles functionality for : * * Construction of nested list from db records with some key pointing to a parent id. * Display of list with or without editing icons with optional pagination. * Reordering of items works across pages. * Processing of editing actions on list. * * @author Jamie Pratt * @license http://www.gnu.org/copyleft/gpl.html GNU Public License * @package moodlecore */ /** * Clues to reading this code: * * The functions that move things around the tree structure just update the * database - they don't update the in-memory structure, instead they trigger a * page reload so everything is rebuilt from scratch. */ class moodle_list { var $attributes; var $listitemclassname = 'list_item'; /** * An array of $listitemclassname objects. * @var array */ var $items = array(); /** * ol / ul * @var string */ var $type; /** * @var list_item or derived class */ var $parentitem = null; var $table; var $fieldnamesparent = 'parent'; var $sortby = 'parent, sortorder, name'; /** * Records from db, only used in top level list. * @var array */ var $records = array(); var $editable; /** * Key is child id, value is parent. * @var array */ var $childparent; //------------------------------------------------------ //vars used for pagination. var $page = 0;// 0 means no pagination var $firstitem = 1; var $lastitem = 999999; var $pagecount; var $paged = false; var $offset = 0; //------------------------------------------------------ var $pageurl; var $pageparamname; /** * Constructor function * * @param string $type * @param string $attributes * @param boolean $editable * @param moodle_url $pageurl url for this page * @param integer $page if 0 no pagination. (These three params only used in top level list.) * @param string $pageparamname name of url param that is used for passing page no * @param integer $itemsperpage no of top level items. * @return moodle_list */ function moodle_list($type='ul', $attributes='', $editable = false, $pageurl=null, $page = 0, $pageparamname = 'page', $itemsperpage = 20) { $this->editable = $editable; $this->attributes = $attributes; $this->type = $type; $this->page = $page; $this->pageparamname = $pageparamname; $this->itemsperpage = $itemsperpage; if ($pageurl === null) { $this->pageurl = new moodle_url(); $this->pageurl->params(array($this->pageparamname => $this->page)); } else { $this->pageurl = $pageurl; } } /** * Returns html string. * * @param integer $indent depth of indentation. */ function to_html($indent=0, $extraargs=array()) { if (count($this->items)) { $tabs = str_repeat("\t", $indent); $first = true; $itemiter = 1; $lastitem = ''; $html = ''; foreach ($this->items as $item) { $last = (count($this->items) == $itemiter); if ($this->editable) { $item->set_icon_html($first, $last, $lastitem); } if ($itemhtml = $item->to_html($indent+1, $extraargs)) { $html .= "$tabs\t<li".((!empty($item->attributes))?(' '.$item->attributes):'').">"; $html .= $itemhtml; $html .= "</li>\n"; } $first = false; $lastitem = $item; $itemiter++; } } else { $html = ''; } if ($html) { //if there are list items to display then wrap them in ul / ol tag. $tabs = str_repeat("\t", $indent); $html = $tabs.'<'.$this->type.((!empty($this->attributes))?(' '.$this->attributes):'').">\n".$html; $html .= $tabs."</".$this->type.">\n"; } else { $html =''; } return $html; } /** * Recurse down the tree and find an item by it's id. * * @param integer $id * @param boolean $suppresserror error if not item found? * @return list_item *copy* or null if item is not found */ function find_item($id, $suppresserror = false) { if (isset($this->items)) { foreach ($this->items as $key => $child) { if ($child->id == $id) { return $this->items[$key]; } } foreach (array_keys($this->items) as $key) { $thischild =& $this->items[$key]; $ref = $thischild->children->find_item($id, true);//error always reported at top level if ($ref !== null) { return $ref; } } } if (!$suppresserror) { print_error('listnoitem'); } return null; } function add_item(&$item) { $this->items[] =& $item; } function set_parent(&$parent) { $this->parentitem =& $parent; } /** * Produces a hierarchical tree of list items from a flat array of records. * 'parent' field is expected to point to a parent record. * records are already sorted. * If the parent field doesn't point to another record in the array then this is * a top level list * * @param integer $offset how many list toplevel items are there in lists before this one * @return array(boolean, integer) whether there is more than one page, $offset + how many toplevel items where there in this list. * */ function list_from_records($paged = false, $offset = 0) { $this->paged = $paged; $this->offset = $offset; $this->get_records(); $records = $this->records; $page = $this->page; if (!empty($page)) { $this->firstitem = ($page - 1) * $this->itemsperpage; $this->lastitem = $this->firstitem + $this->itemsperpage - 1; } $itemiter = $offset; //make a simple array which is easier to search $this->childparent = array(); foreach ($records as $record) { $this->childparent[$record->id] = $record->parent; } //create top level list items and they're responsible for creating their children foreach ($records as $record) { if (!array_key_exists($record->parent, $this->childparent)) { //if this record is not a child of another record then $inpage = ($itemiter >= $this->firstitem && $itemiter <= $this->lastitem); //make list item for top level for all items //we need the info about the top level items for reordering peers. if ($this->parentitem!==null) { $newattributes = $this->parentitem->attributes; } else { $newattributes = ''; } $this->items[$itemiter] =& new $this->listitemclassname($record, $this, $newattributes, $inpage); if ($inpage) { $this->items[$itemiter]->create_children($records, $this->childparent, $record->id); } else { //don't recurse down the tree for items that are not on this page $this->paged = true; } $itemiter++; } } return array($this->paged, $itemiter); } /** * Should be overriden to return an array of records of list items. * */ function get_records() { } /** * display list of page numbers for navigation */ function display_page_numbers() { $html = ''; $topcount = count($this->items); $this->pagecount = (integer) ceil(($topcount + $this->offset)/ QUESTION_PAGE_LENGTH ); if (!empty($this->page) && ($this->paged)) { $html = "<div class=\"paging\">".get_string('page').":\n"; foreach (range(1,$this->pagecount) as $currentpage) { if ($this->page == $currentpage) { $html .= " $currentpage \n"; } else { $html .= "<a href=\"".$this->pageurl->out(false, array($this->pageparamname => $currentpage))."\">"; $html .= " $currentpage </a>\n"; } } $html .= "</div>"; } return $html; } /** * Returns an array of ids of peers of an item. * * @param int itemid - if given, restrict records to those with this parent id. * @return array peer ids */ function get_items_peers($itemid) { $itemref = $this->find_item($itemid); $peerids = $itemref->parentlist->get_child_ids(); return $peerids; } /** * Returns an array of ids of child items. * * @return array peer ids */ function get_child_ids() { $childids = array(); foreach ($this->items as $child) { $childids[] = $child->id; } return $childids; } /** * Move a record up or down * * @param string $direction up / down * @param integer $id */ function move_item_up_down($direction, $id) { $peers = $this->get_items_peers($id); $itemkey = array_search($id, $peers); switch ($direction) { case 'down' : if (isset($peers[$itemkey+1])) { $olditem = $peers[$itemkey+1]; $peers[$itemkey+1] = $id; $peers[$itemkey] = $olditem; } else { print_error('listcantmoveup'); } break; case 'up' : if (isset($peers[$itemkey-1])) { $olditem = $peers[$itemkey-1]; $peers[$itemkey-1] = $id; $peers[$itemkey] = $olditem; } else { print_error('listcantmovedown'); } break; } $this->reorder_peers($peers); } function reorder_peers($peers) { foreach ($peers as $key => $peer) { if (!set_field("{$this->table}", "sortorder", $key, "id", $peer)) { print_error('listupdatefail'); } } } /** * @param integer $id an item index. * @return object the item that used to be the parent of the item moved. */ function move_item_left($id) { $item = $this->find_item($id); if (!isset($item->parentlist->parentitem->parentlist)) { print_error('listcantmoveleft'); } else { $newpeers = $this->get_items_peers($item->parentlist->parentitem->id); if (isset($item->parentlist->parentitem->parentlist->parentitem)) { $newparent = $item->parentlist->parentitem->parentlist->parentitem->id; } else { $newparent = 0; // top level item } if (!set_field("{$this->table}", "parent", $newparent, "id", $item->id)) { print_error('listupdatefail'); } else { $oldparentkey = array_search($item->parentlist->parentitem->id, $newpeers); $neworder = array_merge(array_slice($newpeers, 0, $oldparentkey+1), array($item->id), array_slice($newpeers, $oldparentkey+1)); $this->reorder_peers($neworder); } } return $item->parentlist->parentitem; } /** * Make item with id $id the child of the peer that is just above it in the sort order. * * @param integer $id */ function move_item_right($id) { $peers = $this->get_items_peers($id); $itemkey = array_search($id, $peers); if (!isset($peers[$itemkey-1])) { print_error('listcantmoveright'); } else { if (!set_field("{$this->table}", "parent", $peers[$itemkey-1], "id", $peers[$itemkey])) { print_error('listupdatefail'); } else { $newparent = $this->find_item($peers[$itemkey-1]); if (isset($newparent->children)) { $newpeers = $newparent->children->get_child_ids(); } if ($newpeers) { $newpeers[] = $peers[$itemkey]; $this->reorder_peers($newpeers); } } } } /** * process any actions. * * @param integer $left id of item to move left * @param integer $right id of item to move right * @param integer $moveup id of item to move up * @param integer $movedown id of item to move down * @return unknown */ function process_actions($left, $right, $moveup, $movedown) { //should this action be processed by this list object? if (!(array_key_exists($left, $this->records) || array_key_exists($right, $this->records) || array_key_exists($moveup, $this->records) || array_key_exists($movedown, $this->records))) { return false; } if (!empty($left)) { $oldparentitem = $this->move_item_left($left); if ($this->item_is_last_on_page($oldparentitem->id)) { // Item has jumped onto the next page, change page when we redirect. $this->page ++; $this->pageurl->params(array($this->pageparamname => $this->page)); } } else if (!empty($right)) { $this->move_item_right($right); if ($this->item_is_first_on_page($right)) { // Item has jumped onto the previous page, change page when we redirect. $this->page --; $this->pageurl->params(array($this->pageparamname => $this->page)); } } else if (!empty($moveup)) { $this->move_item_up_down('up', $moveup); if ($this->item_is_first_on_page($moveup)) { // Item has jumped onto the previous page, change page when we redirect. $this->page --; $this->pageurl->params(array($this->pageparamname => $this->page)); } } else if (!empty($movedown)) { $this->move_item_up_down('down', $movedown); if ($this->item_is_last_on_page($movedown)) { // Item has jumped onto the next page, change page when we redirect. $this->page ++; $this->pageurl->params(array($this->pageparamname => $this->page)); } } else { return false; } redirect($this->pageurl->out()); } /** * @param integer $itemid an item id. * @return boolean Is the item with the given id the first top-level item on * the current page? */ function item_is_first_on_page($itemid) { return $this->page && isset($this->items[$this->firstitem]) && $itemid == $this->items[$this->firstitem]->id; } /** * @param integer $itemid an item id. * @return boolean Is the item with the given id the last top-level item on * the current page? */ function item_is_last_on_page($itemid) { return $this->page && isset($this->items[$this->lastitem]) && $itemid == $this->items[$this->lastitem]->id; } } class list_item { /** * id of record, used if list is editable * @var integer */ var $id; /** * name of this item, used if list is editable * @var string */ var $name; /** * The object or string representing this item. * @var mixed */ var $item; var $fieldnamesname = 'name'; var $attributes; var $display; var $icons = array(); /** * @var moodle_list */ var $parentlist; /** * Set if there are any children of this listitem. * @var moodle_list */ var $children; /** * Constructor * @param mixed $item fragment of html for list item or record * @param object &$parent reference to parent of this item * @param string $attributes attributes for li tag * @param boolean $display whether this item is displayed. Some items may be loaded so we have a complete * structure in memory to work with for actions but are not displayed. * @return list_item */ function list_item($item, &$parent, $attributes='', $display = true) { $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 = $display; } /** * Output the html just for this item. Called by to_html which adds html for children. * */ function item_html($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 $extraargs any extra data that is needed to print the list item * may be used by sub class. * @return string html */ function to_html($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".$childrenhtml):''); } function set_icon_html($first, $last, &$lastitem) { global $CFG; $strmoveup = get_string('moveup'); $strmovedown = get_string('movedown'); $strmoveleft = get_string('maketoplevelitem', 'question'); $pixpath = $CFG->pixpath; if (isset($this->parentlist->parentitem)) { $parentitem =& $this->parentlist->parentitem; if (isset($parentitem->parentlist->parentitem)) { $action = get_string('makechildof', 'question', $parentitem->parentlist->parentitem->name); } else { $action = $strmoveleft; } $this->icons['left'] = $this->image_icon($action, $this->parentlist->pageurl->out_action(array('left'=>$this->id)), 'left'); } else { $this->icons['left'] = $this->image_spacer(); } if (!$first) { $this->icons['up'] = $this->image_icon($strmoveup, $this->parentlist->pageurl->out_action(array('moveup'=>$this->id)), 'up'); } else { $this->icons['up'] = $this->image_spacer(); } if (!$last) { $this->icons['down'] = $this->image_icon($strmovedown, $this->parentlist->pageurl->out_action(array('movedown'=>$this->id)), 'down'); } else { $this->icons['down'] = $this->image_spacer(); } if (!empty($lastitem)) { $makechildof = get_string('makechildof', 'question', $lastitem->name); $this->icons['right'] = $this->image_icon($makechildof, $this->parentlist->pageurl->out_action(array('right'=>$this->id)), 'right'); } else { $this->icons['right'] = $this->image_spacer(); } } function image_icon($action, $url, $icon) { global $CFG; $pixpath = $CFG->pixpath; return '<a title="' . $action .'" href="'.$url.'"> <img src="' . $pixpath . '/t/'.$icon.'.gif" class="iconsmall" alt="' . $action. '" /></a> '; } function image_spacer() { global $CFG; $pixpath = $CFG->pixpath; return '<img src="' . $pixpath . '/spacer.gif" class="iconsmall" alt="" />'; } /** * Recurse down tree creating list_items, called from moodle_list::list_from_records * * @param array $records * @param array $children * @param integer $thisrecordid */ function create_children(&$records, &$children, $thisrecordid) { //keys where value is $thisrecordid $thischildren = array_keys($children, $thisrecordid); if (count($thischildren)) { 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); } } } function set_parent(&$parent) { $this->parentlist =& $parent; } } ?>
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