RefreshPhysics class
a scrollPhysics for config refresh scroll effect,enable viewport out of edge whatever physics it is in ClampingScrollPhysics, it doesn't allow to flip out of edge,but in RefreshPhysics,it will allow to do that, by parent physics passing,it also can attach the different of iOS and Android different scroll effect it also handles interception scrolling when refreshed, or when the second floor is open and closed. with SpringDescription passing,you can custom spring back animate,the more paramter can be setting in RefreshConfiguration
see also:
- RefreshConfiguration, a configuration for Controlling how SmartRefresher widgets behave in a subtree
- Inheritance
-
- Object
- ScrollPhysics
- RefreshPhysics
Constructors
- RefreshPhysics({ScrollPhysics? parent, int? updateFlag, double? maxUnderScrollExtent, SpringDescription? springDescription, RefreshController? controller, double? dragSpeedRatio, double? topHitBoundary, double? bottomHitBoundary, bool? enableScrollWhenRefreshCompleted, bool? enableScrollWhenTwoLevel, double? maxOverScrollExtent})
- Creates scroll physics that bounce back from the edge.
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
- bottomHitBoundary → double?
-
final
- controller → RefreshController?
-
final
- dragSpeedRatio → double?
-
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 setterinherited
- enableScrollWhenRefreshCompleted → bool?
-
final
- enableScrollWhenTwoLevel → bool?
-
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- maxFlingVelocity → double
-
Scroll fling velocity magnitudes will be clamped to this value.
no setterinherited
- maxOverScrollExtent → double?
-
final
- maxUnderScrollExtent → double?
-
final
- 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 setterinherited
- 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 setteroverride
- spring → SpringDescription
-
The spring to use for ballistic simulations.
no setterinherited
- springDescription → SpringDescription?
-
final
- tolerance → Tolerance
-
Deprecated. Call toleranceFor instead.
no setterinherited
- topHitBoundary → double?
-
final
- updateFlag → int?
-
final
- viewportRender ↔ RenderViewport?
-
find out the viewport when bouncing,for compute the layoutExtent in header and footer
This does not have any impact on performance. it only execute once
getter/setter pair
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) → RefreshPhysics -
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
ancestoras its parent.inherited -
carriedMomentum(
double existingVelocity) → double -
Returns the velocity carried on repeated flings.
inherited
-
createBallisticSimulation(
ScrollMetrics position, double velocity) → Simulation? -
Returns a simulation for ballistic scrolling starting from the given
position with the given velocity.
override
-
findViewport(
BuildContext? context) → RenderViewport? -
frictionFactor(
double overscrollFraction) → double -
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.
override
-
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