ListWheelViewport class Null safety

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 children's dimensions. But uses RenderListWheelViewport to display the children on a wheel.

See also:

Inheritance

Constructors

ListWheelViewport({Key? key, double diameterRatio = RenderListWheelViewport.defaultDiameterRatio, double perspective = RenderListWheelViewport.defaultPerspective, double offAxisFraction = 0.0, bool useMagnifier = false, double magnification = 1.0, double overAndUnderCenterOpacity = 1.0, required double itemExtent, double squeeze = 1.0, bool renderChildrenOutsideViewport = false, required ViewportOffset offset, required ListWheelChildDelegate childDelegate, Clip clipBehavior = Clip.hardEdge})
Creates a viewport where children are rendered onto a wheel.
const

Properties

childDelegate → ListWheelChildDelegate
A delegate that lazily instantiates children.
final
clipBehavior → Clip
The content will be clipped (or not) according to this option.
final
diameterRatio → double
A ratio between the diameter of the cylinder and the viewport's size in the main axis.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
itemExtent → double
The size of the children along the main axis. Children RenderBoxes will be given the BoxConstraints of this exact size.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
magnification → double
The zoomed-in rate of the magnifier, if it is used.
final
offAxisFraction → double
How much the wheel is horizontally off-center, as a fraction of its width. This property creates the visual effect of looking at a vertical wheel from its side where its vanishing points at the edge curves to one side instead of looking at the wheel head-on.
final
offset → ViewportOffset
ViewportOffset object describing the content that should be visible in the viewport.
final
overAndUnderCenterOpacity → double
The opacity value that will be applied to the wheel that appears below and above the magnifier.
final
perspective → double
Perspective of the cylindrical projection.
final
renderChildrenOutsideViewport → bool
Whether to paint children inside the viewport only.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
squeeze → double
The angular compactness of the children on the wheel.
final
useMagnifier → bool
Whether to use the magnifier for the center item of the wheel.
final

Methods

createElement() → ListWheelElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
override
createRenderObject(BuildContext context) → RenderListWheelViewport
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
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">@protectedinherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited
updateRenderObject(BuildContext context, covariant 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.
override

Operators

operator ==(Object other) → bool
The equality operator.
nonVirtual">@nonVirtualinherited