Allows the delegate to return an additional rectangle in which mouse clicks will initiate divider dragging.
Original signature is '- (NSRect)splitView:(NSSplitView *)splitView additionalEffectiveRectOfDividerAtIndex:(NSInteger)dividerIndex'
Available in Mac OS X v10.5 and later.

C# | Visual Basic | Visual C++ |
public delegate NSRect SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler( NSSplitView splitView, NSInteger dividerIndex )
Public Delegate Function SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler ( _ splitView As NSSplitView, _ dividerIndex As NSInteger _ ) As NSRect
public delegate NSRect SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler( NSSplitView^ splitView, NSInteger dividerIndex )

- splitView (NSSplitView)
- The split view that sent the message.
- dividerIndex (NSInteger)
- The index of the divider.

An additional rectangle in which mouse clicks should initiate divider dragging. The rectangle should be expressed in the coordinate system defined by splitView. Returning NSZeroRect indicates no additional dragging rectangle is desired.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)