Implemented a distributed notification for track information and playback status

Application/PlaybackEventController.h

@@ -10,10 +10,13 @@
 #import <Growl/GrowlApplicationBridge.h>
 
 #import "PlaybackController.h"
+#import "PlaylistEntry.h"
 
 @class AudioScrobbler;
 @interface PlaybackEventController : NSObject <NSUserNotificationCenterDelegate, GrowlApplicationBridgeDelegate> {
 	NSOperationQueue *queue;
+    
+    PlaylistEntry *entry;
 	
 	AudioScrobbler *scrobbler;
     

Application/PlaybackEventController.m

@@ -11,7 +11,19 @@
 #import "PlaybackEventController.h"
 
 #import "AudioScrobbler.h"
-#import "PlaylistEntry.h"
+
+NSString *TrackPlaying = @"org.cogx.Cog-Track-Playing";
+NSString *TrackStopped = @"org.cogx.Cog-Track-Stopped";
+NSString *TrackPaused = @"org.cogx.Cog-Track-Paused";
+
+NSString *TrackArtist = @"artist";
+NSString *TrackAlbum = @"album";
+NSString *TrackTitle = @"title";
+NSString *TrackGenre = @"genre";
+NSString *TrackComposer = @"composer";
+NSString *TrackNumber = @"trackNumber";
+NSString *TrackLength = @"length";
+NSString *TrackCurrentTime = @"currentTime";
 
 @implementation PlaybackEventController
 
@@ -42,6 +54,8 @@
 		scrobbler = [[AudioScrobbler alloc] init];
         [[NSUserNotificationCenter defaultUserNotificationCenter] setDelegate:self];
 		[GrowlApplicationBridge setGrowlDelegate:self];
+        
+        entry = nil;
 	}
 	
 	return self;
@@ -50,13 +64,35 @@
 - (void)dealloc
 {
 	[queue release];
+    
+    [entry release];
 	
 	[super dealloc];
 }
 
+- (NSDictionary *)fillNotificationDictionary:(PlaylistEntry *)pe
+{
+    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
+    
+    if ([pe title]) [dict setObject:[pe title] forKey:TrackTitle];
+    if ([pe artist]) [dict setObject:[pe artist] forKey:TrackArtist];
+    if ([pe album]) [dict setObject:[pe album] forKey:TrackAlbum];
+    if ([pe genre]) [dict setObject:[pe genre] forKey:TrackGenre];
+    if ([pe track]) [dict setObject:[pe track] forKey:TrackNumber];
+    if ([pe lengthText]) [dict setObject:[pe lengthText] forKey:TrackLength];
+    if ([pe positionText]) [dict setObject:[pe positionText] forKey:TrackCurrentTime];
+    
+    return dict;
+}
+
 - (void)performPlaybackDidBeginActions:(PlaylistEntry *)pe
 {
     if (NO == [pe error]) {
+        [entry release];
+        entry = [pe retain];
+        
+        [[NSDistributedNotificationCenter defaultCenter] postNotificationName:TrackPlaying object:nil userInfo:[self fillNotificationDictionary:pe]];
+        
         NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 
         if ([defaults boolForKey:@"notifications.enable"]) {
@@ -110,6 +146,7 @@
 
 - (void)performPlaybackDidPauseActions
 {
+    [[NSDistributedNotificationCenter defaultCenter] postNotificationName:TrackPaused object:nil userInfo:[self fillNotificationDictionary:entry]];
 	if([[NSUserDefaults standardUserDefaults] boolForKey:@"enableAudioScrobbler"]) {
 		[scrobbler pause];
 	}
@@ -117,6 +154,7 @@
 
 - (void)performPlaybackDidResumeActions
 {
+    [[NSDistributedNotificationCenter defaultCenter] postNotificationName:TrackPlaying object:nil userInfo:[self fillNotificationDictionary:entry]];
 	if([[NSUserDefaults standardUserDefaults] boolForKey:@"enableAudioScrobbler"]) {
 		[scrobbler resume];
 	}
@@ -124,6 +162,9 @@
 
 - (void)performPlaybackDidStopActions
 {
+    [[NSDistributedNotificationCenter defaultCenter] postNotificationName:TrackStopped object:nil userInfo:[self fillNotificationDictionary:entry]];
+    [entry release];
+    entry = nil;
 	if([[NSUserDefaults standardUserDefaults] boolForKey:@"enableAudioScrobbler"]) {
 		[scrobbler stop];
 	}

Playlist/PlaylistEntry.h

@@ -73,6 +73,10 @@
 
 @property(readonly) NSString *spam;
 
+@property(readonly) NSString *positionText;
+
+@property(readonly) NSString *lengthText;
+
 @property int index;
 @property int shuffleIndex;
 

Playlist/PlaylistEntry.m

@@ -92,6 +92,16 @@
     return [NSSet setWithObjects:@"artist", @"title", @"album", @"track", @"totalFrames", @"currentPosition", @"bitrate", nil];
 }
 
++ (NSSet *)keyPathsForValuesAffectingPositionText
+{
+    return [NSSet setWithObject:@"currentPosition"];
+}
+
++ (NSSet *)keyPathsForValuesAffectingLengthText
+{
+    return [NSSet setWithObject:@"length"];
+}
+
 + (NSSet *)keyPathsForValuesAffectingAlbumArt
 {
     return [NSSet setWithObject:@"albumArtInternal"];
@@ -234,6 +244,24 @@
     return [elements componentsJoinedByString:@""];
 }
 
+@dynamic positionText;
+- (NSString *)positionText
+{
+    SecondsFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
+    NSString *time = [secondsFormatter stringForObjectValue:[NSNumber numberWithFloat:currentPosition]];
+    [secondsFormatter release];
+    return time;
+}
+
+@dynamic lengthText;
+- (NSString *)lengthText
+{
+    SecondsFormatter *secondsFormatter = [[SecondsFormatter alloc] init];
+    NSString *time = [secondsFormatter stringForObjectValue:[self length]];
+    [secondsFormatter release];
+    return time;
+}
+
 @synthesize albumArtInternal;
 
 @dynamic albumArt;