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