queue/Playlist: add interface QueueListener, replacing calls to idle_add()

5 files changed, 61 insertions, 12 deletions

diff --git a/src/queue/Listener.hxx b/src/queue/Listener.hxx
new file mode 100644
index 000000000..7407d89f6
--- /dev/null
+++ b/src/queue/Listener.hxx
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2003-2016 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_QUEUE_LISTENER_HXX
+#define MPD_QUEUE_LISTENER_HXX
+
+class QueueListener {
+public:
+	/**
+	 * Called after the queue has been modified.
+	 */
+	virtual void OnQueueModified() = 0;
+
+	/**
+	 * Called after a playback options have been changed.
+	 */
+	virtual void OnQueueOptionsChanged() = 0;
+
+	/**
+	 * Called after the player has started playing a new song.
+	 * This gets called by playlist::SyncWithPlayer() after it has
+	 * been notified by the player thread.
+	 */
+	virtual void OnQueueSongStarted() = 0;
+};
+
+#endif
diff --git a/src/queue/Playlist.cxx b/src/queue/Playlist.cxx
index 6909d36a4..136682b00 100644
--- a/src/queue/Playlist.cxx
+++ b/src/queue/Playlist.cxx
@@ -19,10 +19,10 @@
 
 #include "config.h"
 #include "Playlist.hxx"
+#include "Listener.hxx"
 #include "PlaylistError.hxx"
 #include "player/Control.hxx"
 #include "DetachedSong.hxx"
-#include "Idle.hxx"
 #include "Log.hxx"
 
 #include <assert.h>
@@ -86,7 +86,7 @@ playlist::QueuedSongStarted(PlayerControl &pc)
 	if (queue.consume)
 		DeleteOrder(pc, old_current);
 
-	idle_add(IDLE_PLAYER);
+	listener.OnQueueSongStarted();
 
 	SongStarted();
 }
@@ -245,7 +245,7 @@ playlist::SetRepeat(PlayerControl &pc, bool status)
 	   might change when repeat mode is toggled */
 	UpdateQueuedSong(pc, GetQueuedSong());
 
-	idle_add(IDLE_OPTIONS);
+	listener.OnQueueOptionsChanged();
 }
 
 static void
@@ -272,7 +272,7 @@ playlist::SetSingle(PlayerControl &pc, bool status)
 	   might change when single mode is toggled */
 	UpdateQueuedSong(pc, GetQueuedSong());
 
-	idle_add(IDLE_OPTIONS);
+	listener.OnQueueOptionsChanged();
 }
 
 void
@@ -282,7 +282,7 @@ playlist::SetConsume(bool status)
 		return;
 
 	queue.consume = status;
-	idle_add(IDLE_OPTIONS);
+	listener.OnQueueOptionsChanged();
 }
 
 void
@@ -319,7 +319,7 @@ playlist::SetRandom(PlayerControl &pc, bool status)
 
 	UpdateQueuedSong(pc, queued_song);
 
-	idle_add(IDLE_OPTIONS);
+	listener.OnQueueOptionsChanged();
 }
 
 int
diff --git a/src/queue/Playlist.hxx b/src/queue/Playlist.hxx
index 0446f3f17..46ed9ae36 100644
--- a/src/queue/Playlist.hxx
+++ b/src/queue/Playlist.hxx
@@ -30,6 +30,7 @@ class Error;
 class SongLoader;
 class SongTime;
 class SignedSongTime;
+class QueueListener;
 
 struct playlist {
 	/**
@@ -37,6 +38,8 @@ struct playlist {
 	 */
 	Queue queue;
 
+	QueueListener &listener;
+
 	/**
 	 * This value is true if the player is currently playing (or
 	 * should be playing).
@@ -85,8 +88,11 @@ struct playlist {
 	 */
 	int queued;
 
-	playlist(unsigned max_length)
-		:queue(max_length), playing(false),
+	playlist(unsigned max_length,
+		 QueueListener &_listener)
+		:queue(max_length),
+		 listener(_listener),
+		 playing(false),
 		 bulk_edit(false),
 		 current(-1), queued(-1) {
 	}
@@ -129,7 +135,8 @@ struct playlist {
 protected:
 	/**
 	 * Called by all editing methods after a modification.
-	 * Updates the queue version and emits #IDLE_PLAYLIST.
+	 * Updates the queue version and invokes
+	 * QueueListener::OnQueueModified().
 	 */
 	void OnModified();
 
diff --git a/src/queue/PlaylistEdit.cxx b/src/queue/PlaylistEdit.cxx
index 7af1e110f..f50eec144 100644
--- a/src/queue/PlaylistEdit.cxx
+++ b/src/queue/PlaylistEdit.cxx
@@ -25,12 +25,12 @@
 
 #include "config.h"
 #include "Playlist.hxx"
+#include "Listener.hxx"
 #include "PlaylistError.hxx"
 #include "player/Control.hxx"
 #include "util/Error.hxx"
 #include "DetachedSong.hxx"
 #include "SongLoader.hxx"
-#include "Idle.hxx"
 
 #include <memory>
 
@@ -47,7 +47,7 @@ playlist::OnModified()
 
 	queue.IncrementVersion();
 
-	idle_add(IDLE_PLAYLIST);
+	listener.OnQueueModified();
 }
 
 void
diff --git a/src/queue/PlaylistUpdate.cxx b/src/queue/PlaylistUpdate.cxx
index 264ecaa93..d09d66935 100644
--- a/src/queue/PlaylistUpdate.cxx
+++ b/src/queue/PlaylistUpdate.cxx
@@ -22,7 +22,6 @@
 #include "db/Interface.hxx"
 #include "db/LightSong.hxx"
 #include "DetachedSong.hxx"
-#include "Idle.hxx"
 #include "util/Error.hxx"
 
 static bool