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POLimit allowed operations to only NSDragOperationCopy
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2012-12-12T12:05:06.400
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2012-12-14T15:03:41.253
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I have a custom view that is a drag source. I want to limit the allowed drag operations to only a copy, and hence I return NSDragOperationCopy in my draggingSession:sourceOperationMaskForDraggingContext: method. For some reason this has no effect. There doesn't seem to be anything wrong with my code as returning NSDragOperationNone works as expected and blocks drags. Below is the code from my NSView that is the dragging source. Dragging from the view to the "Trash" you'll see a NSDragOperationMove or NSDragOperationDelete even though I only want to allow the NSDragOperationCopy operation. I've also uploaded a small demo project to demonstrate what I'm talking about: <a href="https://dl.dropbox.com/u/368222/test.zip" rel="nofollow">https://dl.dropbox.com/u/368222/test.zip</a>. <pre><code>- (void)mouseDown:(NSEvent *)event { NSString *path = [[NSBundle mainBundle] resourcePath]; NSString *imagePath = [path stringByAppendingString:@"/image.png"]; NSImage *image = [[NSImage alloc] initWithContentsOfFile:imagePath]; NSArray *file = [NSArray arrayWithObject:imagePath]; NSPasteboard *pboard = [NSPasteboard pasteboardWithName:NSDragPboard]; [pboard declareTypes:[NSArray arrayWithObject:NSFilenamesPboardType] owner:nil]; [pboard setPropertyList:file forType:NSFilenamesPboardType]; [self dragImage:image at:NSZeroPoint offset:NSMakeSize(0, 0) event:event pasteboard:pboard source:self slideBack:NO]; } - (NSDragOperation)draggingSession:(NSDraggingSession *)session sourceOperationMaskForDraggingContext:(NSDraggingContext)context { return NSDragOperationCopy; } - (void)draggingSession:(NSDraggingSession *)session endedAtPoint:(NSPoint)screenPoint operation:(NSDragOperation)operation { NSLog(@"Dragging session ended with operation: %li", operation); } </code></pre> Anyone? Thx!
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<cocoa><drag-and-drop>
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Limit allowed operations to only NSDragOperationCopy
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