BouncingScrollPhysics class Null safety

Scroll physics for environments that allow the scroll offset to go beyond the bounds of the content, but then bounce the content back to the edge of those bounds.

This is the behavior typically seen on iOS.

BouncingScrollPhysics by itself will not create an overscroll effect if the contents of the scroll view do not extend beyond the size of the viewport. To create the overscroll and bounce effect regardless of the length of your scroll view, combine with AlwaysScrollableScrollPhysics.

const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics())

See also:



BouncingScrollPhysics({ScrollPhysics? parent})
Creates scroll physics that bounce back from the edge.


allowImplicitScrolling bool
Whether a viewport is allowed to change its scroll position implicitly in response to a call to RenderObject.showOnScreen.
read-only, inherited
dragStartDistanceMotionThreshold double
The minimum amount of pixel distance drags must move by to start motion the first time or after each time the drag motion stopped.
read-only, override
hashCode int
The hash code for this object.
read-only, inherited
maxFlingVelocity double
Scroll fling velocity magnitudes will be clamped to this value.
read-only, inherited
minFlingDistance double
The minimum distance an input pointer drag must have moved to to be considered a scroll fling gesture.
read-only, inherited
minFlingVelocity double
The minimum velocity for an input pointer drag to be considered a scroll fling.
read-only, override
parent ScrollPhysics?
If non-null, determines the default behavior for each method.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
spring SpringDescription
The spring to use for ballistic simulations.
read-only, inherited
tolerance Tolerance
The tolerance to use for ballistic simulations.
read-only, inherited


adjustPositionForNewDimensions({required ScrollMetrics oldPosition, required ScrollMetrics newPosition, required bool isScrolling, required double velocity}) double
Describes what the scroll position should be given new viewport dimensions.
applyBoundaryConditions(ScrollMetrics position, double value) double
Determines the overscroll by applying the boundary conditions.
applyPhysicsToUserOffset(ScrollMetrics position, double offset) double
Used by DragScrollActivity and other user-driven activities to convert an offset in logical pixels as provided by the DragUpdateDetails into a delta to apply (subtract from the current position) using ScrollActivityDelegate.setPixels.
applyTo(ScrollPhysics? ancestor) BouncingScrollPhysics
Combines this ScrollPhysics instance with the given physics.
buildParent(ScrollPhysics? ancestor) ScrollPhysics?
If parent is null then return ancestor, otherwise recursively build a ScrollPhysics that has ancestor as its parent.
@protected, inherited
carriedMomentum(double existingVelocity) double
Momentum build-up function that mimics iOS's scroll speed increase with repeated flings.
createBallisticSimulation(ScrollMetrics position, double velocity) Simulation?
Returns a simulation for ballistic scrolling starting from the given position with the given velocity.
frictionFactor(double overscrollFraction) double
The multiple applied to overscroll to make it appear that scrolling past the edge of the scrollable contents is harder than scrolling the list. This is done by reducing the ratio of the scroll effect output vs the scroll gesture input.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
recommendDeferredLoading(double velocity, ScrollMetrics metrics, BuildContext context) bool
Provides a heuristic to determine if expensive frame-bound tasks should be deferred.
shouldAcceptUserOffset(ScrollMetrics position) bool
Whether the scrollable should let the user adjust the scroll offset, for example by dragging.
toString() String
A string representation of this object.


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