NSSplitView Delegate

NSSplitView Delegate.mm

#define kSnapToDelta  		8.0
#define	kMinSourceListWidth		150.0
#define kSnapSourceListWidth	250.0
#define kMinContentWidth		150.0

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - NSSplitView Delegate
- (void) splitView:(NSSplitView*) splitView resizeSubviewsWithOldSize:(NSSize) oldSize
{
  if (splitView == _splitView)
	{
		CGFloat dividerPos = NSWidth([[[splitView subviews] objectAtIndex:0] frame]);
		CGFloat width = NSWidth([splitView frame]);
        
		if (dividerPos < kMinSourceListWidth)
			dividerPos = kMinSourceListWidth;
		if (width - dividerPos < kMinContentWidth + [splitView dividerThickness])
			dividerPos = width - (kMinContentWidth + [splitView dividerThickness]);
		
		[splitView adjustSubviews];
		[splitView setPosition:dividerPos ofDividerAtIndex:0];
	}
}

- (CGFloat) splitView:(NSSplitView*) splitView constrainSplitPosition:(CGFloat) proposedPosition ofSubviewAt:(NSInteger) dividerIndex
{
	if (splitView == _splitView)
	{
		CGFloat width = NSWidth([splitView frame]);
		
		if (ABS(kSnapSourceListWidth - proposedPosition) <= kSnapToDelta)
			proposedPosition = kSnapSourceListWidth;
		if (proposedPosition < kMinSourceListWidth)
			proposedPosition = kMinSourceListWidth;
		if (width - proposedPosition < kMinContentWidth + [splitView dividerThickness])
			proposedPosition = width - (kMinContentWidth + [splitView dividerThickness]);
	}
	
	return proposedPosition;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////