From 684c3be721cd2fb8d259315189f7401f1f249e26 Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Tue, 20 Nov 2012 17:43:50 +0800
Subject: [PATCH] MDL-25552 mod_lesson: changing filepicker element to
 filemanager to allow the deletion of a file

---
 mod/lesson/lib.php      | 52 ++++++++++++++++++++++++++++-------------
 mod/lesson/mod_form.php | 17 ++++++++------
 2 files changed, 46 insertions(+), 23 deletions(-)

diff --git a/mod/lesson/lib.php b/mod/lesson/lib.php
index 89f4eda36d8..77015f96cba 100644
--- a/mod/lesson/lib.php
+++ b/mod/lesson/lib.php
@@ -43,6 +43,8 @@ function lesson_add_instance($data, $mform) {
     global $DB;
 
     $cmid = $data->coursemodule;
+    $draftitemid = $data->mediafile;
+    $context = context_module::instance($cmid);
 
     lesson_process_pre_save($data);
 
@@ -50,14 +52,9 @@ function lesson_add_instance($data, $mform) {
     $lessonid = $DB->insert_record("lesson", $data);
     $data->id = $lessonid;
 
-    $context = context_module::instance($cmid);
     $lesson = $DB->get_record('lesson', array('id'=>$lessonid), '*', MUST_EXIST);
 
-    if ($filename = $mform->get_new_filename('mediafilepicker')) {
-        if ($file = $mform->save_stored_file('mediafilepicker', $context->id, 'mod_lesson', 'mediafile', 0, '/', $filename)) {
-            $DB->set_field('lesson', 'mediafile', '/'.$file->get_filename(), array('id'=>$lesson->id));
-        }
-    }
+    lesson_update_media_file($lessonid, $context, $draftitemid);
 
     lesson_process_post_save($data);
 
@@ -80,22 +77,15 @@ function lesson_update_instance($data, $mform) {
 
     $data->id = $data->instance;
     $cmid = $data->coursemodule;
+    $draftitemid = $data->mediafile;
+    $context = context_module::instance($cmid);
 
     lesson_process_pre_save($data);
 
     unset($data->mediafile);
     $DB->update_record("lesson", $data);
 
-    $context = context_module::instance($cmid);
-    if ($filename = $mform->get_new_filename('mediafilepicker')) {
-        if ($file = $mform->save_stored_file('mediafilepicker', $context->id, 'mod_lesson', 'mediafile', 0, '/', $filename, true)) {
-            $DB->set_field('lesson', 'mediafile', '/'.$file->get_filename(), array('id'=>$data->id));
-        } else {
-            $DB->set_field('lesson', 'mediafile', '', array('id'=>$data->id));
-        }
-    } else {
-        $DB->set_field('lesson', 'mediafile', '', array('id'=>$data->id));
-    }
+    lesson_update_media_file($data->id, $context, $draftitemid);
 
     lesson_process_post_save($data);
 
@@ -959,3 +949,33 @@ function lesson_page_type_list($pagetype, $parentcontext, $currentcontext) {
         'mod-lesson-edit'=>get_string('page-mod-lesson-edit', 'lesson'));
     return $module_pagetype;
 }
+
+/**
+ * Update the lesson activity to include any file
+ * that was uploaded, or if there is none, set the
+ * mediafile field to blank.
+ *
+ * @param int $lessonid the lesson id
+ * @param stdClass $context the context
+ * @param int $draftitemid the draft item
+ */
+function lesson_update_media_file($lessonid, $context, $draftitemid) {
+    global $DB;
+
+    // Set the filestorage object.
+    $fs = get_file_storage();
+    // Save the file if it exists that is currently in the draft area.
+    file_save_draft_area_files($draftitemid, $context->id, 'mod_lesson', 'mediafile', 0);
+    // Get the file if it exists.
+    $files = $fs->get_area_files($context->id, 'mod_lesson', 'mediafile', 0, 'itemid, filepath, filename', false);
+    // Check that there is a file to process.
+    if (count($files) == 1) {
+        // Get the first (and only) file.
+        $file = reset($files);
+        // Set the mediafile column in the lessons table.
+        $DB->set_field('lesson', 'mediafile', '/' . $file->get_filename(), array('id' => $lessonid));
+    } else {
+        // Set the mediafile column in the lessons table.
+        $DB->set_field('lesson', 'mediafile', '', array('id' => $lessonid));
+    }
+}
diff --git a/mod/lesson/mod_form.php b/mod/lesson/mod_form.php
index 3b2f1a20a71..9e88c584d69 100644
--- a/mod/lesson/mod_form.php
+++ b/mod/lesson/mod_form.php
@@ -259,11 +259,14 @@ class mod_lesson_mod_form extends moodleform_mod {
 //-------------------------------------------------------------------------------
         $mform->addElement('header', 'mediafileheader', get_string('mediafile', 'lesson'));
 
-        $filepickeroptions = array();
-        $filepickeroptions['filetypes'] = '*';
-        $filepickeroptions['maxbytes'] = $this->course->maxbytes;
-        $mform->addElement('filepicker', 'mediafilepicker', get_string('mediafile', 'lesson'), null, $filepickeroptions);
-        $mform->addHelpButton('mediafilepicker', 'mediafile', 'lesson');
+        $filemanageroptions = array();
+        $filemanageroptions['filetypes'] = '*';
+        $filemanageroptions['maxbytes'] = $this->course->maxbytes;
+        $filemanageroptions['subdirs'] = 0;
+        $filemanageroptions['maxfiles'] = 1;
+
+        $mform->addElement('filemanager', 'mediafile', get_string('mediafile', 'lesson'), null, $filemanageroptions);
+        $mform->addHelpButton('mediafile', 'mediafile', 'lesson');
 
 //-------------------------------------------------------------------------------
         $mform->addElement('header', 'dependencyon', get_string('dependencyon', 'lesson'));
@@ -321,9 +324,9 @@ class mod_lesson_mod_form extends moodleform_mod {
 
         if ($this->current->instance) {
             // editing existing instance - copy existing files into draft area
-            $draftitemid = file_get_submitted_draft_itemid('mediafilepicker');
+            $draftitemid = file_get_submitted_draft_itemid('mediafile');
             file_prepare_draft_area($draftitemid, $this->context->id, 'mod_lesson', 'mediafile', 0, array('subdirs'=>0, 'maxbytes' => $this->course->maxbytes, 'maxfiles' => 1));
-            $default_values['mediafilepicker'] = $draftitemid;
+            $default_values['mediafile'] = $draftitemid;
         }
     }