initial drop of a few sources to start things out

AppKit/GTMDelegatingTableColumn.h

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+//
+//  GTMDelegatingTableColumn.h
+//
+//  Copyright 2006-2008 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+// 
+//  http://www.apache.org/licenses/LICENSE-2.0
+// 
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import <Cocoa/Cocoa.h>
+
+@interface GTMDelegatingTableColumn : NSTableColumn {
+ @private
+  IBOutlet id delegate_;
+}
+- (void)setDelegate:(id)delegate;
+- (id)delegate;
+- (id)dataCellForRow:(int)row;
+@end
+
+@interface NSObject (GTMDelegatingTableColumnDelegate)
+- (id)tableColumn:(NSTableColumn*)column dataCellForRow:(int)row;
+@end

AppKit/GTMDelegatingTableColumn.m

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+//
+//  GTMDelegatingTableColumn.m
+//
+//  Copyright 2006-2008 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+// 
+//  http://www.apache.org/licenses/LICENSE-2.0
+// 
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import "GTMDelegatingTableColumn.h"
+
+@implementation GTMDelegatingTableColumn
+- (void)setDelegate:(id)delegate {
+  delegate_ = delegate;
+}
+
+- (id)delegate {
+  return delegate_;
+}
+
+- (id)dataCellForRow:(int)row {
+  id dataCell = nil;
+  if (delegate_ && [delegate_ respondsToSelector:@selector(tableColumn:dataCellForRow:)]) {
+    dataCell = [delegate_ tableColumn:self dataCellForRow:row];
+  } else {
+    dataCell = [super dataCellForRow:row];
+  }
+  return dataCell;
+}
+@end