BouncingScrollPhysics class

BouncingScrollPhysics class - widgets library

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.

link

const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics())

Constructors

BouncingScrollPhysics({ScrollDecelerationRate decelerationRate = ScrollDecelerationRate.normal, ScrollPhysics? parent}): Creates scroll physics that bounce back from the edge.
const

Properties

allowImplicitScrolling → bool: Whether a viewport is allowed to change its scroll position implicitly in response to a call to RenderObject.showOnScreen.
no setterinherited
allowUserScrolling → bool: Whether a viewport is allowed to change the scroll position as the result of user input.
no setterinherited
decelerationRate → ScrollDecelerationRate: Used to determine parameters for friction simulations.
final
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.
no setteroverride
hashCode → int: The hash code for this object.
no setterinherited
maxFlingVelocity → double: Scroll fling velocity magnitudes will be clamped to this value.
no setteroverride
minFlingDistance → double: The minimum distance an input pointer drag must have moved to be considered a scroll fling gesture.
no setterinherited
minFlingVelocity → double: The minimum velocity for an input pointer drag to be considered a scroll fling.
no setteroverride
parent → ScrollPhysics?: If non-null, determines the default behavior for each method.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
spring → SpringDescription: The spring to use for ballistic simulations.
no setteroverride
tolerance → Tolerance: Deprecated. Call toleranceFor instead.
no setterinherited

Methods

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.
inherited
applyBoundaryConditions(ScrollMetrics position, double value) → double: Determines the overscroll by applying the boundary conditions.
override
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.
override
applyTo(ScrollPhysics? ancestor) → BouncingScrollPhysics: Combines this ScrollPhysics instance with the given physics.
override
buildParent(ScrollPhysics? ancestor) → ScrollPhysics?: If parent is null then return ancestor, otherwise recursively build a ScrollPhysics that has ancestor as its parent.
inherited
carriedMomentum(double existingVelocity) → double: Momentum build-up function that mimics iOS's scroll speed increase with repeated flings.
override
createBallisticSimulation(ScrollMetrics position, double velocity) → Simulation?: Returns a simulation for ballistic scrolling starting from the given position with the given velocity.
override
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 nonexistent method or property is accessed.
inherited
recommendDeferredLoading(double velocity, ScrollMetrics metrics, BuildContext context) → bool: Provides a heuristic to determine if expensive frame-bound tasks should be deferred.
inherited
shouldAcceptUserOffset(ScrollMetrics position) → bool: Whether the scrollable should let the user adjust the scroll offset, for example by dragging. If allowUserScrolling is false, the scrollable will never allow user input to change the scroll position.
inherited
toleranceFor(ScrollMetrics metrics) → Tolerance: The tolerance to use for ballistic simulations.
inherited
toString() → String: A string representation of this object.
inherited

Operators

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