Question

Differently from a NSTableView, the delegate methods of an empty NSOutlineView are never invoked.

For instance, NSTableView method:

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)rowIndex

is invoked even if there are not rows.

But, NSOutlineView method:

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item

is not invoked if there are not items.

I need to write arbitrary text on the first row of my outlineView when it is empty. But I can’t use the above mentioned method like I do for NSTableView.

What’s the solution ?

thanks

Answer 1

Have you implemented outlineView:numberOfChildrenOfItem: to give a correct answer when passed nil?

From your description it seems to me that it should return 1 (your initial line) when passed nil, but I can’t be sure without more code and/or information.