ListWheelViewport class

A viewport showing a subset of children on a wheel.

Typically used with ListWheelScrollView, this viewport is similar to Viewport in that it shows a subset of children in a scrollable based on the scrolling offset and the childrens' dimensions. But uses RenderListWheelViewport to display the children on a wheel.

See also:



ListWheelViewport({Key key, double diameterRatio: RenderListWheelViewport.defaultDiameterRatio, double perspective: RenderListWheelViewport.defaultPerspective, @required double itemExtent, bool clipToSize: true, bool renderChildrenOutsideViewport: false, @required ViewportOffset offset, List<Widget> children })
Create a viewport where children are rendered onto a wheel. [...]


clipToSize bool
Whether to clip painted children to the inside of this viewport. [...]
diameterRatio double
A ratio between the diameter of the cylinder and the viewport's size in the main axis. [...]
itemExtent double
The size of the children along the main axis. Children RenderBoxes will be given the BoxConstraints of this exact size. [...]
offset ViewportOffset
ViewportOffset object describing the content that should be visible in the viewport.
perspective double
Perspective of the cylindrical projection. [...]
renderChildrenOutsideViewport bool
Whether to paint children inside the viewport only. [...]
children List<Widget>
The widgets below this widget in the tree. [...]
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
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


createRenderObject(BuildContext context) RenderListWheelViewport
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget. [...]
updateRenderObject(BuildContext context, RenderListWheelViewport 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. [...]
createElement() MultiChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
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(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. [...]