+
+void
+Content::signal_changed (int p)
+{
+ if (ui_signaller) {
+ ui_signaller->emit (boost::bind (boost::ref (Changed), shared_from_this (), p, _change_signals_frequent));
+ }
+}
+
+void
+Content::set_position (Time p)
+{
+ {
+ boost::mutex::scoped_lock lm (_mutex);
+ if (p == _position) {
+ return;
+ }
+
+ _position = p;
+ }
+
+ signal_changed (ContentProperty::POSITION);
+}
+
+void
+Content::set_trim_start (Time t)
+{
+ {
+ boost::mutex::scoped_lock lm (_mutex);
+ _trim_start = t;
+ }
+
+ signal_changed (ContentProperty::TRIM_START);
+}
+
+void
+Content::set_trim_end (Time t)
+{
+ {
+ boost::mutex::scoped_lock lm (_mutex);
+ _trim_end = t;
+ }
+
+ signal_changed (ContentProperty::TRIM_END);
+}
+
+
+shared_ptr<Content>
+Content::clone () const
+{
+ shared_ptr<const Film> film = _film.lock ();
+ if (!film) {
+ return shared_ptr<Content> ();
+ }
+
+ /* This is a bit naughty, but I can't think of a compelling reason not to do it ... */
+ xmlpp::Document doc;
+ xmlpp::Node* node = doc.create_root_node ("Content");
+ as_xml (node);
+
+ /* notes is unused here (we assume) */
+ list<string> notes;
+ return content_factory (film, cxml::NodePtr (new cxml::Node (node)), Film::current_state_version, notes);
+}
+
+string
+Content::technical_summary () const
+{
+ return String::compose ("%1 %2 %3", path_summary(), digest(), position());
+}
+
+Time
+Content::length_after_trim () const
+{
+ return full_length() - trim_start() - trim_end();
+}
+
+/** @param t A time relative to the start of this content (not the position).
+ * @return true if this time is trimmed by our trim settings.
+ */
+bool
+Content::trimmed (Time t) const
+{
+ return (t < trim_start() || t > (full_length() - trim_end ()));
+}
+
+/** @return string which includes everything about how this content affects
+ * its playlist.
+ */
+string
+Content::identifier () const
+{
+ stringstream s;
+
+ s << Content::digest()
+ << "_" << position()
+ << "_" << trim_start()
+ << "_" << trim_end();
+
+ return s.str ();
+}
+
+bool
+Content::paths_valid () const
+{
+ for (vector<boost::filesystem::path>::const_iterator i = _paths.begin(); i != _paths.end(); ++i) {
+ if (!boost::filesystem::exists (*i)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+void
+Content::set_path (boost::filesystem::path path)
+{
+ _paths.clear ();
+ _paths.push_back (path);
+ signal_changed (ContentProperty::PATH);
+}
+
+string
+Content::path_summary () const
+{
+ /* XXX: should handle multiple paths more gracefully */
+
+ assert (number_of_paths ());
+
+ string s = path(0).filename().string ();
+ if (number_of_paths() > 1) {
+ s += " ...";
+ }
+
+ return s;
+}