Forgot to add these files for undo support.

Playlist/EntriesController.h

@@ -0,0 +1,23 @@
+//
+//  EntriesController.h
+//  Cog
+//
+//  Created by Vincent Spader on 2/10/08.
+//  Copyright 2008 __MyCompanyName__. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+#import "PlaylistEntry.h"
+
+@interface EntriesController : NSObject {
+	NSUndoManager *undoManager;
+	NSMutableArray *playlistEntries;
+}
+
+- (NSMutableArray *)entries;
+- (void)setEntries:(NSMutableArray *)array;
+- (void)insertObject:(PlaylistEntry *)pe inEntriesAtIndex:(int)index;
+- (void)removeObjectFromEntriesAtIndex:(int)index;
+
+
+@end

Playlist/EntriesController.m

@@ -0,0 +1,72 @@
+//
+//  EntriesController.m
+//  Cog
+//
+//  Created by Vincent Spader on 2/10/08.
+//  Copyright 2008 __MyCompanyName__. All rights reserved.
+//
+
+#import "EntriesController.h"
+
+#define UNDO_STACK_LIMIT 0
+
+@implementation EntriesController
+
+- (id)init
+{
+	self = [super init];
+	
+	if (self)
+	{
+		playlistEntries = [[NSMutableArray alloc] init];
+		undoManager = [[NSUndoManager alloc] init];
+
+		[undoManager setLevelsOfUndo:UNDO_STACK_LIMIT];
+	}
+	
+	return self;
+}
+
+- (void)dealloc
+{
+	[playlistEntries release];
+	[undoManager release];
+	
+	[super dealloc];
+}
+
+- (NSUndoManager *)undoManager
+{
+	return undoManager;
+}
+
+- (NSMutableArray *)entries
+{
+	return playlistEntries;
+}
+
+- (void)setEntries:(NSMutableArray *)array
+{
+	if (array == playlistEntries)
+		return;
+		
+	[array retain];
+	[playlistEntries release];
+	playlistEntries = array;
+}
+
+- (void)insertObject:(PlaylistEntry *)pe inEntriesAtIndex:(int)index
+{
+	[[[self undoManager] prepareWithInvocationTarget:self] removeObjectFromEntriesAtIndex:index];
+	[playlistEntries insertObject:pe atIndex:index];
+}
+
+- (void)removeObjectFromEntriesAtIndex:(int)index
+{
+	[[[self undoManager] prepareWithInvocationTarget:self] insertObject:[playlistEntries objectAtIndex:index] inEntriesAtIndex:index];
+	
+	[playlistEntries removeObjectAtIndex:index];
+}
+
+
+@end