NestedScrollViewViewport class Null safety

The Viewport variant used by NestedScrollView.

This viewport takes a SliverOverlapAbsorberHandle and notifies it any time the viewport needs to recompute its layout (e.g. when it is scrolled).



NestedScrollViewViewport({Key? key, AxisDirection axisDirection = AxisDirection.down, AxisDirection? crossAxisDirection, double anchor = 0.0, required ViewportOffset offset, Key? center, List<Widget> slivers = const <Widget>[], required SliverOverlapAbsorberHandle handle, Clip clipBehavior = Clip.hardEdge})
Creates a variant of Viewport that has a SliverOverlapAbsorberHandle.


anchor double
The relative position of the zero scroll offset.
final, inherited
axisDirection AxisDirection
The direction in which the offset's ViewportOffset.pixels increases.
final, inherited
cacheExtent double?
The viewport has an area before and after the visible area to cache items that are about to become visible when the user scrolls.
final, inherited
cacheExtentStyle CacheExtentStyle
Controls how the cacheExtent is interpreted.
final, inherited
center Key?
The first child in the GrowthDirection.forward growth direction.
final, inherited
children List<Widget>
The widgets below this widget in the tree.
final, inherited
clipBehavior Clip
The content will be clipped (or not) according to this option.
final, inherited
crossAxisDirection AxisDirection?
The direction in which child should be laid out in the cross axis.
final, inherited
handle SliverOverlapAbsorberHandle
The handle to the SliverOverlapAbsorber that is feeding this injector.
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree.
final, inherited
offset ViewportOffset
Which part of the content inside the viewport should be visible.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


createElement() MultiChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
createRenderObject(BuildContext context) RenderNestedScrollViewViewport
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
@protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel =}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.
updateRenderObject(BuildContext context, covariant RenderNestedScrollViewViewport renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.


operator ==(Object other) bool
The equality operator.
@nonVirtual, inherited