Returns the height in points of the row containing
- macOS 10.4+
The outline view that sent the message.
The row item.
The height of the row.
Values returned by this method should not include intercell spacing and must be greater than
Implement this method to support an outline view with varying row heights.
For large tables in particular, you should make sure that this method is efficient.
NSOutline may cache the values this method returns, so if you would like to change a row's height make sure to invalidate the row height by calling
NSOutline automatically invalidates its entire row height cache in