You need to implement -outlineView:heightOfRowByItem: to return the height you 
want for each row.  Hope that helps.

—Rob


> On Aug 30, 2018, at 6:23 PM, Demitri Muna <cocoa-...@demitri.com> wrote:
> 
> Hi,
> 
> I’ve been hitting my head against a wall for more time than I’d like to admit 
> on what should be a simple problem - maybe someone can spot it immediately…
> 
> I’m implementing a view-based source list style NSOutlineView (I’m trying to 
> mimic the Finder sidebar). My header items are a different row height than 
> the items underneath. I’ve implemented outlineView:rowViewForItem: (returns 
> 24 for headers, 20 for items).
> 
> The rows are spaced as expected in the column, but they are not drawn 
> correctly. The cell is cropped to 12 pixels, as seen here:
> 
> https://imgur.com/a/7KKgtZX
> 
> I expect the highlighting to extend to the full height of the row. I tried to 
> force this by adding two constraints, 2 pixels above and below the image, 
> then got this:
> 
> 2018-08-30 14:55:36.807612-0400 Nightlight[78272:15775715] [Layout] Unable to 
> simultaneously satisfy constraints:
> (
>    "<NSLayoutConstraint:0x60c00009be90 NSImageView:0x60c000170e00.height == 
> 16   (active)>",
>    "<NSLayoutConstraint:0x60c000087ee0 V:|-(2)-[NSImageView:0x60c000170e00]   
> (active, names: DE_DataCell:0x60c000188470, '|':DE_DataCell:0x60c000188470 
> )>",
>    "<NSLayoutConstraint:0x60c000082300 V:[NSImageView:0x60c000170e00]-(2)-|   
> (active, names: DE_DataCell:0x60c000188470, '|':DE_DataCell:0x60c000188470 
> )>",
>    "<NSLayoutConstraint:0x60c00009c5c0 'NSView-Encapsulated-Layout-Height' 
> DE_DataCell.height == 12   (active, names: DE_DataCell:0x60c000188470 )>"
> )
> 
> This shows where the problem is: a height constraint on the row of 12 with 
> the name "NSView-Encapsulated-Layout-Height”. This is the exact height I see 
> being drawn. I have no idea where this is coming from or how to fix it 
> though. Any help welcome - it’s annoying because this seems like such simple 
> thing!
> 
> Demitri
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