ListWheelScrollView class
A box in which children on a wheel can be scrolled.
This widget is similar to a ListView but with the restriction that all children must be the same size along the scrolling axis.
When the list is at the zero scroll offset, the first child is aligned with the middle of the viewport. When the list is at the final scroll offset, the last child is aligned with the middle of the viewport
The children are rendered as if rotating on a wheel instead of scrolling on a plane.
- Inheritance
- Object
- Diagnosticable
- DiagnosticableTree
- Widget
- StatefulWidget
- ListWheelScrollView
Constructors
-
ListWheelScrollView({Key key, ScrollController controller, ScrollPhysics physics, double diameterRatio: RenderListWheelViewport.defaultDiameterRatio, double perspective: RenderListWheelViewport.defaultPerspective, double offAxisFraction: 0.0, bool useMagnifier: false, double magnification: 1.0, @required double itemExtent, ValueChanged<
int> onSelectedItemChanged, bool clipToSize: true, bool renderChildrenOutsideViewport: false, @required List< Widget> children }) - Constructs a list in which children are scrolled a wheel. Its children are passed to a delegate and lazily built during layout.
-
ListWheelScrollView.useDelegate({Key key, ScrollController controller, ScrollPhysics physics, double diameterRatio: RenderListWheelViewport.defaultDiameterRatio, double perspective: RenderListWheelViewport.defaultPerspective, double offAxisFraction: 0.0, bool useMagnifier: false, double magnification: 1.0, @required double itemExtent, ValueChanged<
int> onSelectedItemChanged, bool clipToSize: true, bool renderChildrenOutsideViewport: false, @required ListWheelChildDelegate childDelegate }) -
Constructs a list in which children are scrolled a wheel. Its children
are managed by a delegate and are lazily built during layout.
const
Properties
- childDelegate → ListWheelChildDelegate
-
A delegate that helps lazily instantiating child.
final
- clipToSize → bool
-
Whether to clip painted children to the inside of this viewport. [...]
final
- controller → ScrollController
-
Typically a FixedExtentScrollController used to control the current item. [...]
final
- diameterRatio → double
-
A ratio between the diameter of the cylinder and the viewport's size
in the main axis. [...]
final
- itemExtent → double
-
Size of each child in the main axis. Must not be null and must be
positive.
final
- magnification → double
-
null
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
-
onSelectedItemChanged
→ ValueChanged<
int> -
On optional listener that's called when the centered item changes.
final
- perspective → double
-
Perspective of the cylindrical projection. [...]
final
- physics → ScrollPhysics
-
How the scroll view should respond to user input. [...]
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
-
createState(
) → _ListWheelScrollViewState -
Creates the mutable state for this widget at a given location in the tree. [...]
override
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
-
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
-
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