resizeFlags
The flags field of the event record for the mouse-down event that initiated the resizing session.
Declaration
var resizeFlags: NSEvent.ModifierFlags { get }Discussion
The value of this property is a mask indicating which of the modifier keys was held down when the mouse-down event occurred. The flags are listed in NSEvent class’s modifierFlags method description. The property is valid only while the window is being resized.
You can use this property to constrain the direction or amount of resizing. Because of its limited validity, this property should only be accessed from within an implementation of the delegate method windowWillResize(_:to:).