From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 1 Dec 2010 13:45:34 +0000 (+0000)
Subject: Add signal_track_changed to Jukebox
X-Git-Url: http://git.tdb.fi/?p=libs%2Fal.git;a=commitdiff_plain;h=c9eccd8b7006b3bcfa0a4d70cd26e43323c3c2b5

Add signal_track_changed to Jukebox
Make sure the current_track iterator is never uninitialized or invalid
Add get_current_track method
---

diff --git a/source/jukebox.cpp b/source/jukebox.cpp
index 3cd5e08..391edd1 100644
--- a/source/jukebox.cpp
+++ b/source/jukebox.cpp
@@ -7,6 +7,7 @@ Distributed under the LGPL
 
 #include <algorithm>
 #include <cstdlib>
+#include <msp/core/except.h>
 #include "jukebox.h"
 #include "sound.h"
 
@@ -18,6 +19,7 @@ namespace AL {
 Jukebox::Jukebox():
 	streamer(source),
 	sound(0),
+	current_track(tracks.end()),
 	shuffle(false)
 { }
 
@@ -32,7 +34,10 @@ void Jukebox::add_track(const string &trk)
 	bool was_empty=tracks.empty();
 	tracks.push_back(trk);
 	if(was_empty)
+	{
 		current_track=tracks.begin();
+		signal_track_changed.emit(*current_track);
+	}
 }
 
 void Jukebox::remove_track(const string &trk)
@@ -43,6 +48,8 @@ void Jukebox::remove_track(const string &trk)
 		if(i==current_track)
 			next();
 		tracks.erase(i);
+		if(tracks.empty())
+			current_track=tracks.end();
 	}
 }
 
@@ -50,6 +57,14 @@ void Jukebox::clear_tracks()
 {
 	stop();
 	tracks.clear();
+	current_track=tracks.end();
+}
+
+const string &Jukebox::get_current_track() const
+{
+	if(tracks.empty())
+		throw InvalidState("No current track");
+	return *current_track;
 }
 
 void Jukebox::set_shuffle(bool s)
@@ -91,6 +106,7 @@ void Jukebox::next()
 			if(current_track==tracks.end())
 				current_track=tracks.begin();
 		}
+		signal_track_changed.emit(*current_track);
 	}
 	play();
 }
diff --git a/source/jukebox.h b/source/jukebox.h
index 2b4e0cd..85a2b03 100644
--- a/source/jukebox.h
+++ b/source/jukebox.h
@@ -10,6 +10,7 @@ Distributed under the LGPL
 
 #include <list>
 #include <string>
+#include <sigc++/signal.h>
 #include "source.h"
 #include "streamer.h"
 
@@ -20,6 +21,9 @@ class Sound;
 
 class Jukebox
 {
+public:
+	sigc::signal<void, const std::string &> signal_track_changed;
+
 private:
 	Source source;
 	Streamer streamer;
@@ -36,6 +40,7 @@ public:
 	void add_track(const std::string &);
 	void remove_track(const std::string &);
 	void clear_tracks();
+	const std::string &get_current_track() const;
 	void set_shuffle(bool);
 
 	void play();