NestedScrollViewViewport class

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 [], @required SliverOverlapAbsorberHandle handle })
Creates a variant of Viewport that has a SliverOverlapAbsorberHandle. [...]


handle SliverOverlapAbsorberHandle
The handle to the SliverOverlapAbsorber that is feeding this injector.
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
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
crossAxisDirection AxisDirection
The direction in which child should be laid out in the cross axis. [...]
final, inherited
hashCode → int
The hash code for this object. [...]
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


createRenderObject(BuildContext context) RenderNestedScrollViewViewport
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
updateRenderObject(BuildContext context, RenderNestedScrollViewViewport renderObject) → void
createElement() → _ViewportElement
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
didUnmountRenderObject(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 toStringDeep. [...]
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String
Returns 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.


operator ==(dynamic other) → bool
The equality operator. [...]