Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
class	Cocoa Collection View	MBS MacControls Plugin	21.0	✅ Yes	❌ No	❌ No	❌ No	Desktop only

A layout that organizes items into a flexible and configurable arrangement.

In a flow layout, the first item is positioned in the top-left corner and other items are laid out either horizontally or vertically based on the scroll direction, which is configurable. Items may be the same size or different sizes, and you may use the flow layout object or the collection view’s delegate object to specify the size of items and the spacing around them. The flow layout also lets you specify custom header and footer views for each section.

You can use an NSCollectionViewFlowLayoutMBS object as-is or subclass it to modify more aspects of the layout behavior. There are several ways to customize the basic layout behavior that do not require subclassing. For example, you can use a delegate object to change the size and spacing of items dynamically. Subclassing is appropriate for more advanced layout changes, such as adding supplementary views or decoration views, supporting custom layout attributes, or customizing the layout animations when inserting or deleting items.

see also
https://developer.apple.com/documentation/appkit/nscollectionviewflowlayout
Subclass of the NSCollectionViewLayoutMBS class.