New file

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@4676 72102866-910b-0410-8b05-ffd578937521

Source/NSObjectProtocols.m

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+/* 
+   NSObjectProtocols.h
+
+   Various informal protocols.
+
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+   Author:  Adam Fedor <fedor@gnu.org>
+   Date: Jul 1999
+   
+   This file is part of the GNUstep GUI Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/ 
+
+#include <AppKit/NSDragging.h>
+
+@implementation NSObject (NSDraggingDestination)
+
+//
+// Before the Image is Released
+//
+- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
+{
+  return NSDragOperationNone;
+}
+
+- (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender
+{
+  return NSDragOperationNone;
+}
+
+- (void)draggingExited:(id <NSDraggingInfo>)sender
+{
+}
+
+//
+// After the Image is Released
+//
+- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender
+{
+  return NO;
+}
+
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
+{
+  return NO;
+}
+
+- (void)concludeDragOperation:(id <NSDraggingInfo>)sender
+{
+}
+
+@end
+
+@implementation NSObject (NSDraggingSource)
+
+//
+// Querying the Source
+//
+- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal
+{
+  return NSDragOperationNone;
+}
+
+- (BOOL)ignoreModifierKeysWhileDragging
+{
+  return NO;
+}
+
+//
+// Informing the Source
+//
+- (void)draggedImage:(NSImage *)image
+             beganAt:(NSPoint)screenPoint
+{
+}
+
+- (void)draggedImage: (NSImage*)image
+             endedAt: (NSPoint)screenPoint
+           deposited: (BOOL)didDeposit
+{
+}
+
+@end