playlist editor: add data fetch delay after position changes

src/actions.cpp

@@ -2798,6 +2798,8 @@ void listsChangeFinisher()
 		else if (myScreen->isActiveWindow(myPlaylistEditor->Playlists))
 		{
 			myPlaylistEditor->Content.clear();
+			myPlaylistEditor->Content.refresh();
+			myPlaylistEditor->updateTimer();
 		}
 #		ifdef HAVE_TAGLIB_H
 		else if (myScreen->activeWindow() == myTagEditor->Dirs)

src/playlist_editor.cpp

@@ -42,7 +42,9 @@ using Global::MainStartY;
 
 PlaylistEditor *myPlaylistEditor;
 
-namespace {//
+namespace {
+
+const auto fetch_delay = boost::posix_time::milliseconds(500);
 
 size_t LeftColumnStartX;
 size_t LeftColumnWidth;
@@ -56,6 +58,7 @@ bool SongEntryMatcher(const boost::regex &rx, const MPD::Song &s);
 }
 
 PlaylistEditor::PlaylistEditor()
+: m_timer(boost::posix_time::from_time_t(0))
 {
 	LeftColumnWidth = COLS/3-1;
 	RightColumnStartX = LeftColumnWidth+1;
@@ -152,7 +155,9 @@ void PlaylistEditor::update()
 		Playlists.refresh();
 	}
 	
-	if (!Playlists.empty() && (Content.reallyEmpty() || m_content_update_requested))
+	if (!Playlists.empty()
+	&& ((Content.reallyEmpty() && Global::Timer - m_timer > fetch_delay) || m_content_update_requested)
+	)
 	{
 		m_content_update_requested = false;
 		Content.clearSearchResults();
@@ -535,6 +540,11 @@ void PlaylistEditor::nextColumn()
 
 /***********************************************************************/
 
+void PlaylistEditor::updateTimer()
+{
+	m_timer = Global::Timer;
+}
+
 void PlaylistEditor::Locate(const std::string &name)
 {
 	update();

src/playlist_editor.h

@@ -69,6 +69,8 @@ struct PlaylistEditor: Screen<NC::Window *>, Filterable, HasColumns, HasSongs, S
 	virtual void nextColumn() OVERRIDE;
 	
 	// private members
+	void updateTimer();
+
 	void requestPlaylistsUpdate() { m_playlists_update_requested = true; }
 	void requestContentsUpdate() { m_content_update_requested = true; }
 	
@@ -87,6 +89,8 @@ private:
 	
 	bool m_playlists_update_requested;
 	bool m_content_update_requested;
+
+	boost::posix_time::ptime m_timer;
 };
 
 extern PlaylistEditor *myPlaylistEditor;