These constants determine how NSCell objects behave when an NSMatrix object is tracking the mouse.
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enum Mode : UInt
The NSCell objects are asked to track the mouse with trackMouse(with:in:of:untilMouseUp:) whenever the cursor is inside their bounds. No highlighting is performed.
An NSCell is highlighted before it’s asked to track the mouse, then unhighlighted when it’s done tracking.
Selects no more than one NSCell at a time.
NSCell objects are highlighted, but don’t track the mouse.