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:
- ListWheelScrollView, widget that combines this viewport with a scrollable.
- RenderListWheelViewport, the render object that renders the children on a wheel.
- Inheritance
- Object
- Diagnosticable
- DiagnosticableTree
- Widget
- RenderObjectWidget
- ListWheelViewport
Constructors
- ListWheelViewport({Key key, double diameterRatio: RenderListWheelViewport.defaultDiameterRatio, double perspective: RenderListWheelViewport.defaultPerspective, double offAxisFraction: 0.0, bool useMagnifier: false, double magnification: 1.0, @required double itemExtent, bool clipToSize: true, bool renderChildrenOutsideViewport: false, @required ViewportOffset offset, @required ListWheelChildDelegate childDelegate })
-
Creates a viewport where children are rendered onto a wheel. [...]
const
Properties
- childDelegate → ListWheelChildDelegate
-
A delegate that lazily instantiates children.
final
- clipToSize → bool
-
Whether to clip painted children to the inside of this viewport. [...]
final
- diameterRatio → double
-
A ratio between the diameter of the cylinder and the viewport's size
in the main axis. [...]
final
- itemExtent → double
-
The size of the children along the main axis. Children RenderBoxes will
be given the BoxConstraints of this exact size. [...]
final
- 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
- perspective → double
-
Perspective of the cylindrical projection. [...]
final
- renderChildrenOutsideViewport → bool
-
Whether to paint children inside the viewport only. [...]
final
- useMagnifier → bool
-
Whether to use the magnifier for the center item of the wheel.
final
- 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
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
-
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
-
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. [...]
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, inherited
-
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 toStringDeep. [...]
inherited
-
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns 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
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited