gesture

const (
	// TypeStart and TypeEnd are the start and end of a gesture. A gesture
	// spans multiple events.
	TypeStart Type = 0
	TypeEnd   Type = 1

	// TypeIsXxx is when the gesture is recognized as a long press, double
	// press or drag. For example, a mouse button press won't generate a
	// TypeIsLongPress immediately, but if a threshold duration passes without
	// the corresponding mouse button release, a TypeIsLongPress event is sent.
	//
	// Once a TypeIsXxx event is sent, the corresponding Event.Xxx bool field
	// is set for this and subsequent events. For example, a TypeTap event by
	// itself doesn't say whether or not it is a single tap or the first tap of
	// a double tap. If the app needs to distinguish these two sorts of taps,
	// it can wait until a TypeEnd or TypeIsDoublePress event is seen. If a
	// TypeEnd is seen before TypeIsDoublePress, or equivalently, if the
	// TypeEnd event's DoublePress field is false, the gesture is a single tap.
	//
	// These attributes aren't exclusive. A long press drag is perfectly valid.
	//
	// The uncommon "double press" instead of "double tap" terminology is
	// because, in this package, taps are associated with button releases, not
	// button presses. Note also that "double" really means "at least two".
	TypeIsLongPress   Type = 10
	TypeIsDoublePress Type = 11
	TypeIsDrag        Type = 12

	// TypeTap and TypeDrag are tap and drag events.
	//
	// For 'flinging' drags, to simulate inertia, look to the Velocity field of
	// the TypeEnd event.
	//
	// TODO: implement velocity.
	TypeTap  Type = 20
	TypeDrag Type = 21
)