[Brass]

Can anyone tell me how I can drag an item from an NSTableView to an item in an NSOutlineView?

The purpose is to have an item from a flat list (the table view) added to an organised list (the outline view).

If someone can help me figure this out, I'd be grateful.

[tobli]

Couldn't be easier with Cocoa:

Start by telling the NSOutlineView that it should receive drops. awakeFromNib in your window controller is normally a good place for this. Replace the ... below with whatever type you want to drag to the outline view. Either use the constants from NSPasteboard.h (NSStringPboardType, NSFilenamesPboardType, ...) or use your own type (like @"MyUniqueDragType") if you're going to drag a type of data that isn't covered by the standard types.

Code:
[myOutlineView registerForDraggedTypes:[NSArray arrayWithObjects:..., nil]];

Next add the following methods to your datasource for the NSTableView and NSOutlineView respectively (normally they are both the same as the window controller):

Code:
- (BOOL)tableView:(NSTableView *)tv writeRows:(NSArray*)rows
toPasteboard:(NSPasteboard*)pboard
{
    // this is a trivial example that always puts the string foo
    // on the pasteboard when dragging

    [pboard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:self];
    [pboard setString:@"foo" forType:NSStringPboardType];

    return YES;    
}

- (NSDragOperation)outlineView:(NSOutlineView*)olv validateDrop:(id <NSDraggingInfo>)info
proposedItem:(id)item proposedChildIndex:(int)index
{
    // depending on info you might refuse the drag (return NSDragOperationNone)
    // or use some other operation
    return NSDragOperationGeneric;
}

- (BOOL)outlineView:(NSOutlineView*)olv acceptDrop:(id <NSDraggingInfo>)info
item:(id)item childIndex:(int)index
{
    // this is where you normally add the dragged object to the
    // data hierarchy for the outline view
    NSPasteboard *pb = [info draggingPasteboard];
    NSString *s = [pb stringForType:NSStringPboardType];

    NSLog(@"drop accepted: %@", s);
    return YES;
}

Hope this helps

/Tobias

[Brass]

Thanks muchly for the advice... I'll give it a go when I get a chance later in the week.