Informs the gesture recognizer that the user pressed a mouse button other than the left or right one.
- macOS 10.10+
An object encapsulating information about the mouse-down event.
The default implementation of this method does nothing. Use this method to start tracking the gesture in whatever way is appropriate.
A gesture recognizer monitors events that occur in its view (and any subviews) but does not take part in the responder chain itself. The gesture recognizer receives events before any views do. Use the
delays property to control whether
event is propagated to the view.