ScrollDragController class

Scrolls a scroll view as the user drags their finger across the screen.

Constructors

ScrollDragController({@required ScrollActivityDelegate delegate, @required DragStartDetails details, VoidCallback onDragCanceled, double carriedVelocity, double motionStartDistanceThreshold }): Creates an object that scrolls a scroll view as the user drags their finger across the screen. [...]

carriedVelocity → double: Velocity that was present from a previous ScrollActivity when this drag began.
final
delegate → ScrollActivityDelegate: The object that will actuate the scroll view as the user drags.
read-only
lastDetails → dynamic: The most recently observed DragStartDetails, DragUpdateDetails, or DragEndDetails object.
read-only
motionStartDistanceThreshold → double: Amount of pixels in either direction the drag has to move by to start scroll movement again after each time scrolling came to a stop.
final
onDragCanceled → VoidCallback: Called when dispose is called.
final
hashCode → int: The hash code for this object. [...]
read-only, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

cancel() → void: The input from the pointer is no longer directed towards this receiver. [...]
override
dispose() → void: Called by the delegate when it is no longer sending events to this object.
@mustCallSuper
end(DragEndDetails details) → void: The pointer is no longer in contact with the screen. [...]
override
toString() → String: Returns a string representation of this object.
override
update(DragUpdateDetails details) → void: The pointer has moved.
override
updateDelegate(ScrollActivityDelegate value) → void: Updates the controller's link to the ScrollActivityDelegate. [...]
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited

momentumRetainStationaryDurationThreshold → const Duration: Maximum amount of time interval the drag can have consecutive stationary pointer update events before losing the momentum carried from a previous scroll activity.
const Duration(milliseconds: 20)
motionStoppedDurationThreshold → const Duration: Maximum amount of time interval the drag can have consecutive stationary pointer update events before needing to break the motionStartDistanceThreshold to start motion again.
const Duration(milliseconds: 50)