queue: Give notifiers an "on_track_added()" function

So they can tell GUIs that something has been added.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

core/queue.cpp

@@ -14,6 +14,7 @@
 static class DefaultNotifier : public QNotifier {
 public:
 	DefaultNotifier() {};
+	void on_track_added(unsigned int pos) {};
 } def_notify;
 
 
@@ -147,6 +148,7 @@ unsigned int Queue :: _add_at(Track *track, unsigned int pos)
 {
 	_tracks.insert(_tracks.begin() + pos, track);
 	_length += track->length();
+	_notify->on_track_added(pos);
 	get_callbacks()->on_queue_track_add(this, pos);
 	return pos;
 }

include/core/queue.h

@@ -46,6 +46,13 @@ enum sort_t {
 class QNotifier {
 public:
 	QNotifier() {}; /**< Notifier constructor. */
+
+	/**
+	 * Called when a track is added to a queue.
+	 *
+	 * @param  pos  Position in the queue that the track was added.
+	 */
+	virtual void on_track_added(unsigned int) = 0;
 };
 
 

tests/core/queue.cpp

@@ -19,6 +19,7 @@ Track *TRACK_NULL = NULL;
 static class TestNotifier : public QNotifier {
 public:
 	TestNotifier() : QNotifier() {}
+	void on_track_added(unsigned int i)  { count_add++; }
 } test_notifier;
 
 
@@ -33,7 +34,6 @@ public:
 };
 
 TestQueue *Q = NULL, *R = NULL;
-void test_add_cb_noop(Queue *q, unsigned int id) { }
 void test_del_cb_noop(Queue *q, unsigned int id) { }
 
 
@@ -82,11 +82,6 @@ void test_flags()
 	test_equal(q.has_flag(Q_NO_SORT), false);
 }
 
-void test_add_cb(Queue *q, unsigned int id)
-{
-	count_add++;
-}
-
 void test_del_cb(Queue *q, unsigned int id)
 {
 	count_del++;
@@ -137,7 +132,6 @@ void test_add_remove()
 	TestQueue q(0);
 	Q = &q;
 
-	get_callbacks()->on_queue_track_add = test_add_cb;
 	get_callbacks()->on_queue_track_del = test_del_cb;
 
 	test_equal(q.length(), expected);
@@ -212,7 +206,6 @@ void test_updated()
 	TestQueue q(0);
 
 	Q = &q;
-	get_callbacks()->on_queue_track_add = test_add_cb_noop;
 	get_callbacks()->on_queue_track_changed = test_updated_cb;
 
 	test_fill_q();