+
+void
+Playlist::move_earlier (shared_ptr<Content> c)
+{
+ sort (_content.begin(), _content.end(), ContentSorter ());
+
+ ContentList::iterator previous = _content.end ();
+ ContentList::iterator i = _content.begin();
+ while (i != _content.end() && *i != c) {
+ previous = i;
+ ++i;
+ }
+
+ assert (i != _content.end ());
+ if (previous == _content.end ()) {
+ return;
+ }
+
+ Time const p = (*previous)->position ();
+ (*previous)->set_position (p + c->length_after_trim ());
+ c->set_position (p);
+ sort (_content.begin(), _content.end(), ContentSorter ());
+
+ Changed ();
+}
+
+void
+Playlist::move_later (shared_ptr<Content> c)
+{
+ sort (_content.begin(), _content.end(), ContentSorter ());
+
+ ContentList::iterator i = _content.begin();
+ while (i != _content.end() && *i != c) {
+ ++i;
+ }
+
+ assert (i != _content.end ());
+
+ ContentList::iterator next = i;
+ ++next;
+
+ if (next == _content.end ()) {
+ return;
+ }
+
+ Time const p = (*next)->position ();
+ (*next)->set_position (c->position ());
+ c->set_position (p + c->length_after_trim ());
+ sort (_content.begin(), _content.end(), ContentSorter ());
+
+ Changed ();
+}
+
+bool
+Playlist::content_paths_valid () const
+{
+ for (ContentList::const_iterator i = _content.begin(); i != _content.end(); ++i) {
+ if (!(*i)->path_valid ()) {
+ return false;
+ }
+ }
+
+ return true;
+}