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

See also:

Inheritance

Constructors

ListWheelViewport.new({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.
no setterinherited
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.
no setterinherited
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.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
didUnmountRenderObject(covariant RenderObject renderObject) → void
This method is called when a RenderObject that was previously associated with this widget is removed from the render tree. The provided RenderObject will be of the same type as the one created by this widget's createRenderObject method.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent 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, int wrapWidth = 65}) → 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.
inherited