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97 lines
4.0 KiB
PHP
97 lines
4.0 KiB
PHP
<?php // $Id$
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/****************** moveit ************************************/
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confirm_sesskey();
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$pageid = required_param('pageid', PARAM_INT); // page to move
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if (!$page = get_record("lesson_pages", "id", $pageid)) {
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error("Moveit: page not found");
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}
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$after = required_param('after', PARAM_INT); // target page
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// first step. determine the new first page
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// (this is done first as the current first page will be lost in the next step)
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if (!$after) {
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// the moved page is the new first page
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$newfirstpageid = $pageid;
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// reset $after so that is points to the last page
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// (when the pages are in a ring this will in effect be the first page)
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if ($page->nextpageid) {
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if (!$after = get_field("lesson_pages", "id", "lessonid", $lesson->id, "nextpageid", 0)) {
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error("Moveit: last page id not found");
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}
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} else {
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// the page being moved is the last page, so the new last page will be
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$after = $page->prevpageid;
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}
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} elseif (!$page->prevpageid) {
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// the page to be moved was the first page, so the following page must be the new first page
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$newfirstpageid = $page->nextpageid;
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} else {
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// the current first page remains the first page
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if (!$newfirstpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
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error("Moveit: current first page id not found");
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}
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}
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// the rest is all unconditional...
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// second step. join pages into a ring
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if (!$firstpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "prevpageid", 0)) {
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error("Moveit: firstpageid not found");
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}
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if (!$lastpageid = get_field("lesson_pages", "id", "lessonid", $lesson->id, "nextpageid", 0)) {
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error("Moveit: lastpage not found");
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}
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if (!set_field("lesson_pages", "prevpageid", $lastpageid, "id", $firstpageid)) {
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error("Moveit: unable to update link");
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}
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if (!set_field("lesson_pages", "nextpageid", $firstpageid, "id", $lastpageid)) {
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error("Moveit: unable to update link");
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}
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// third step. remove the page to be moved
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if (!$prevpageid = get_field("lesson_pages", "prevpageid", "id", $pageid)) {
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error("Moveit: prevpageid not found");
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}
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if (!$nextpageid = get_field("lesson_pages", "nextpageid", "id", $pageid)) {
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error("Moveit: nextpageid not found");
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}
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if (!set_field("lesson_pages", "nextpageid", $nextpageid, "id", $prevpageid)) {
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error("Moveit: unable to update link");
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}
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if (!set_field("lesson_pages", "prevpageid", $prevpageid, "id", $nextpageid)) {
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error("Moveit: unable to update link");
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}
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// fourth step. insert page to be moved in new place...
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if (!$nextpageid = get_field("lesson_pages", "nextpageid", "id", $after)) {
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error("Movit: nextpageid not found");
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}
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if (!set_field("lesson_pages", "nextpageid", $pageid, "id", $after)) {
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error("Moveit: unable to update link");
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}
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if (!set_field("lesson_pages", "prevpageid", $pageid, "id", $nextpageid)) {
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error("Moveit: unable to update link");
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}
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// ...and set the links in the moved page
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if (!set_field("lesson_pages", "prevpageid", $after, "id", $pageid)) {
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error("Moveit: unable to update link");
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}
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if (!set_field("lesson_pages", "nextpageid", $nextpageid, "id", $pageid)) {
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error("Moveit: unable to update link");
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}
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// fifth step. break the ring
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if (!$newlastpageid = get_field("lesson_pages", "prevpageid", "id", $newfirstpageid)) {
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error("Moveit: newlastpageid not found");
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}
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if (!set_field("lesson_pages", "prevpageid", 0, "id", $newfirstpageid)) {
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error("Moveit: unable to update link");
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}
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if (!set_field("lesson_pages", "nextpageid", 0, "id", $newlastpageid)) {
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error("Moveit: unable to update link");
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}
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redirect("$CFG->wwwroot/mod/lesson/edit.php?id=$cm->id", get_string('movedpage', 'lesson'));
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?>
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