Touch events

Touch event attributes:

eventType

Type of the current event - whether the finger was placed on the screen, moved, lifted or cancelled.

changedTouches

An array of objects where every object represents a single touch. Contains information only about the touches that were affected by the event i.e. those that were placed down, moved, lifted or cancelled.

allTouches

An array of objects where every object represents a single touch. Contains information about all active touches.

numberOfTouches

Number representing the count of currently active touches.

caution

Don't rely on the order of items in the touches as it may change during the gesture, instead use the id attribute to track individual touches across events.

PointerData attributes:

id

A number representing id of the touch. It may be used to track the touch between events as the id will not change while it is being tracked.

x

X coordinate of the current position of the touch relative to the view attached to the GestureDetector. Expressed in point units.

y

Y coordinate of the current position of the touch relative to the view attached to the GestureDetector. Expressed in point units.

absoluteX

X coordinate of the current position of the touch relative to the window. The value is expressed in point units. It is recommended to use it instead of x in cases when the original view can be transformed as an effect of the gesture.

absoluteY

Y coordinate of the current position of the touch relative to the window. The value is expressed in point units. It is recommended to use it instead of y in cases when the original view can be transformed as an effect of the gesture.