BallisticScrollActivity class

An activity that animates a scroll view based on a physics Simulation.

A BallisticScrollActivity is typically used when the user lifts their finger off the screen to continue the scrolling gesture with the current velocity.

BallisticScrollActivity is also used to restore a scroll view to a valid scroll offset when the geometry of the scroll view changes. In these situations, the Simulation typically starts with a zero velocity.

See also:

Inheritance

Constructors

BallisticScrollActivity(ScrollActivityDelegate delegate, Simulation simulation, TickerProvider vsync, bool shouldIgnorePointer)
Creates an activity that animates a scroll view based on a simulation.

Properties

delegate → ScrollActivityDelegate
The delegate that this activity will use to actuate the scroll view.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
isScrolling → bool
Whether performing this activity constitutes scrolling.
no setteroverride
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
shouldIgnorePointer → bool
Whether the scroll view should ignore pointer events while performing this activity.
final
velocity → double
If applicable, the velocity at which the scroll offset is currently independently changing (i.e. without external stimuli such as a dragging gestures) in logical pixels per second for this activity.
no setteroverride

Methods

applyMoveTo(double value) → bool
Move the position to the given location.
applyNewDimensions() → void
Called when the scroll view that is performing this activity changes its metrics.
override
dispatchOverscrollNotification(ScrollMetrics metrics, BuildContext context, double overscroll) → void
Dispatch an OverscrollNotification with the given metrics and overscroll.
override
dispatchScrollEndNotification(ScrollMetrics metrics, BuildContext context) → void
Dispatch a ScrollEndNotification with the given metrics and overscroll.
inherited
dispatchScrollStartNotification(ScrollMetrics metrics, BuildContext? context) → void
Dispatch a ScrollStartNotification with the given metrics.
inherited
dispatchScrollUpdateNotification(ScrollMetrics metrics, BuildContext context, double scrollDelta) → void
Dispatch a ScrollUpdateNotification with the given metrics and scroll delta.
inherited
dispose() → void
Called when the scroll view stops performing this activity.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
resetActivity() → void
Called by the ScrollActivityDelegate when it has changed type (for example, when changing from an Android-style scroll position to an iOS-style scroll position). If this activity can differ between the two modes, then it should tell the position to restart that activity appropriately.
override
toString() → String
A string representation of this object.
override
updateDelegate(ScrollActivityDelegate value) → void
Updates the activity's link to the ScrollActivityDelegate.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited