libsaria: Tell playlist renderers to goto a specific index

I want to use this to scroll the library list when a new song is picked.

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

include/libsaria/playlist.h

@@ -36,6 +36,7 @@ namespace libsaria
 
 			void incr_iter();
 			Track *picked_next();
+			unsigned int find_cur_index();
 
 		protected:
 			string name;

include/libsaria/renderer.h

@@ -20,6 +20,8 @@ namespace libsaria
 			bool is_static();
 			virtual void prepare_for_removal();
 
+			virtual void goto_index(unsigned int);
+
 			virtual void insert_prepare();
 			virtual void insert(Track *, unsigned int);
 			virtual void insert_done();

libsaria/playlist/next.cpp

@@ -20,14 +20,14 @@ namespace libsaria
 	Track *Playlist::picked_next()
 	{
 		Track *res = (*cur);
-		unsigned int index = 0;
-		list<Track *>::iterator it;
+		unsigned int index;
 
-		if (flags & PL_NO_DRAIN)
+		index = find_cur_index();
+
+		if (flags & PL_NO_DRAIN) {
+			RENDER(goto_index(index));
 			return res;
-
-		for (it = plist.begin(); it != cur; it++)
-			index++;
+		}
 
 		cur = plist.erase(cur);
 		if (cur == plist.end())

libsaria/playlist/playlist.cpp

@@ -59,4 +59,14 @@ namespace libsaria
 		cur = plist.begin();
 	}
 
+	unsigned int Playlist::find_cur_index()
+	{
+		list<Track *>::iterator it;
+		unsigned int index = 0;
+
+		for (it = plist.begin(); it != cur; it++)
+			index++;
+		return index;
+	}
+
 }

libsaria/playlist/renderer.cpp

@@ -45,4 +45,8 @@ namespace libsaria
 	{
 	}
 
+	void PlaylistRenderer::goto_index(unsigned int index)
+	{
+	}
+
 }; /* Namespace: libsaria */