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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using JetBrains.Annotations;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.async;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.physics;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.external;
using Unity.UIWidgets.scheduler;
using Unity.UIWidgets.ui;
using UnityEngine;
namespace Unity.UIWidgets.widgets {
public interface ListWheelChildDelegate {
Widget build(BuildContext context, int index);
int? estimatedChildCount { get; }
int trueIndexOf(int index);
bool shouldRebuild(ListWheelChildDelegate oldDelegate);
}
public class ListWheelChildListDelegate : ListWheelChildDelegate {
public ListWheelChildListDelegate(
List<Widget> children
) {
D.assert(children != null);
this.children = children;
}
public readonly List<Widget> children;
public int? estimatedChildCount {
get { return children.Count; }
}
public Widget build(BuildContext context, int index) {
if (index < 0 || index >= children.Count) {
return null;
}
return new IndexedSemantics(child: children[index], index: index);
}
public int trueIndexOf(int index) {
return index;
}
public bool shouldRebuild(ListWheelChildDelegate oldDelegate) {
return children != ((ListWheelChildListDelegate) oldDelegate).children;
}
}
public class ListWheelChildLoopingListDelegate : ListWheelChildDelegate {
public ListWheelChildLoopingListDelegate(
List<Widget> children
) {
D.assert(children != null);
this.children = children;
}
public readonly List<Widget> children;
public int? estimatedChildCount {
get { return null; }
}
public int trueIndexOf(int index) {
return index % children.Count;
}
public Widget build(BuildContext context, int index) {
if (children.isEmpty()) {
return null;
}
return new IndexedSemantics(child: children[Mathf.Abs(index % children.Count)]);
}
public bool shouldRebuild(ListWheelChildDelegate oldDelegate) {
return children != ((ListWheelChildLoopingListDelegate) oldDelegate).children;
}
}
public class ListWheelChildBuilderDelegate : ListWheelChildDelegate {
public ListWheelChildBuilderDelegate(
IndexedWidgetBuilder builder,
int? childCount = null
) {
D.assert(builder != null);
this.builder = builder;
this.childCount = childCount;
}
public readonly IndexedWidgetBuilder builder;
public readonly int? childCount;
public int? estimatedChildCount {
get { return childCount; }
}
public Widget build(BuildContext context, int index) {
if (childCount == null) {
Widget child = builder(context, index);
return child == null ? null : new IndexedSemantics(child: child);
}
if (index < 0 || index >= childCount) {
return null;
}
return new IndexedSemantics(child: builder(context, index));
}
public int trueIndexOf(int index) {
return index;
}
public bool shouldRebuild(ListWheelChildDelegate oldDelegate) {
return builder != ((ListWheelChildBuilderDelegate) oldDelegate).builder ||
childCount != ((ListWheelChildBuilderDelegate) oldDelegate).childCount;
}
}
class ListWheelScrollViewUtils {
public static int _getItemFromOffset(
float offset ,
float itemExtent ,
float minScrollExtent ,
float maxScrollExtent
) {
return (_clipOffsetToScrollableRange(offset, minScrollExtent, maxScrollExtent) / itemExtent).round();
}
public static float _clipOffsetToScrollableRange(
float offset,
float minScrollExtent,
float maxScrollExtent
) {
return Mathf.Min(Mathf.Max(offset, minScrollExtent), maxScrollExtent);
}
}
public class FixedExtentScrollController : ScrollController {
public FixedExtentScrollController(
int initialItem = 0
) {
this.initialItem = initialItem;
}
public readonly int initialItem;
public int selectedItem {
get {
D.assert(positions.isNotEmpty(),
() =>
"FixedExtentScrollController.selectedItem cannot be accessed before a scroll view is built with it."
);
D.assert(positions.Count == 1,
() =>
"The selectedItem property cannot be read when multiple scroll views are attached to the same FixedExtentScrollController."
);
_FixedExtentScrollPosition position = (_FixedExtentScrollPosition) this.position;
return position.itemIndex;
}
}
public Future animateToItem(
int itemIndex,
TimeSpan duration,
Curve curve
) {
if (!hasClients) {
return null;
}
List<Future> futures = new List<Future>();
foreach (_FixedExtentScrollPosition position in positions.Cast<_FixedExtentScrollPosition>()) {
futures.Add(position.animateTo(
itemIndex * position.itemExtent,
duration: duration,
curve: curve
));
}
return Future.wait<object>(futures);
}
public void jumpToItem(int itemIndex) {
foreach (_FixedExtentScrollPosition position in positions.Cast<_FixedExtentScrollPosition>()) {
position.jumpTo(itemIndex * position.itemExtent);
}
}
public override ScrollPosition createScrollPosition(
ScrollPhysics physics,
ScrollContext context,
ScrollPosition oldPosition) {
return new _FixedExtentScrollPosition(
physics: physics,
context: context,
initialItem: initialItem,
oldPosition: oldPosition
);
}
}
public interface IFixedExtentMetrics {
int itemIndex { set; get; }
FixedExtentMetrics copyWith(
float? minScrollExtent = null,
float? maxScrollExtent = null,
float? pixels = null,
float? viewportDimension = null,
AxisDirection? axisDirection = null,
int? itemIndex = null
);
}
public class FixedExtentMetrics : FixedScrollMetrics, IFixedExtentMetrics {
public FixedExtentMetrics(
float minScrollExtent ,
float maxScrollExtent,
float pixels ,
float viewportDimension ,
AxisDirection axisDirection ,
int itemIndex
) : base(
minScrollExtent: minScrollExtent ,
maxScrollExtent: maxScrollExtent ,
pixels: pixels ,
viewportDimension: viewportDimension ,
axisDirection: axisDirection
) {
this.itemIndex = itemIndex;
}
public int itemIndex { get; set; }
public FixedExtentMetrics copyWith(
float? minScrollExtent = null,
float? maxScrollExtent = null,
float? pixels = null,
float? viewportDimension = null,
AxisDirection? axisDirection = null,
int? itemIndex = null
) {
return new FixedExtentMetrics(
minScrollExtent: minScrollExtent ?? this.minScrollExtent,
maxScrollExtent: maxScrollExtent ?? this.maxScrollExtent,
pixels: pixels ?? this.pixels,
viewportDimension: viewportDimension ?? this.viewportDimension,
axisDirection: axisDirection ?? this.axisDirection,
itemIndex: itemIndex ?? this.itemIndex
);
}
}
class _FixedExtentScrollPosition : ScrollPositionWithSingleContext, IFixedExtentMetrics {
public _FixedExtentScrollPosition(
ScrollPhysics physics = null,
ScrollContext context = null,
int? initialItem = null,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(
physics: physics,
context: context,
initialPixels: _getItemExtentFromScrollContext(context) * (initialItem ?? 0.0f),
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel
) {
D.assert(
context is _FixedExtentScrollableState,
() => "FixedExtentScrollController can only be used with ListWheelScrollViews"
);
}
static float _getItemExtentFromScrollContext(ScrollContext context) {
_FixedExtentScrollableState scrollable = (_FixedExtentScrollableState) context;
return scrollable.itemExtent;
}
public float itemExtent {
get { return _getItemExtentFromScrollContext(context); }
}
public int itemIndex {
get {
return ListWheelScrollViewUtils._getItemFromOffset(
offset: pixels,
itemExtent: itemExtent,
minScrollExtent: minScrollExtent,
maxScrollExtent: maxScrollExtent
);
}
set { }
}
public FixedExtentMetrics copyWith(
float? minScrollExtent = null,
float? maxScrollExtent = null,
float? pixels = null,
float? viewportDimension = null,
AxisDirection? axisDirection = null,
int? itemIndex = null
) {
return new FixedExtentMetrics(
minScrollExtent: minScrollExtent ?? this.minScrollExtent,
maxScrollExtent: maxScrollExtent ?? this.maxScrollExtent,
pixels: pixels ?? this.pixels,
viewportDimension: viewportDimension ?? this.viewportDimension,
axisDirection: axisDirection ?? this.axisDirection,
itemIndex: itemIndex ?? this.itemIndex
);
}
}
class _FixedExtentScrollable : Scrollable {
public _FixedExtentScrollable(
float itemExtent,
Key key = null,
AxisDirection axisDirection = AxisDirection.down,
ScrollController controller = null,
ScrollPhysics physics = null,
ViewportBuilder viewportBuilder = null
) : base(
key: key,
axisDirection: axisDirection,
controller: controller,
physics: physics,
viewportBuilder: viewportBuilder
) {
this.itemExtent = itemExtent;
}
public readonly float itemExtent;
public override State createState() {
return new _FixedExtentScrollableState();
}
}
class _FixedExtentScrollableState : ScrollableState {
public float itemExtent {
get {
_FixedExtentScrollable actualWidget = (_FixedExtentScrollable) widget;
return actualWidget.itemExtent;
}
}
}
public class FixedExtentScrollPhysics : ScrollPhysics {
public FixedExtentScrollPhysics(
ScrollPhysics parent = null
) : base(parent: parent) { }
public override ScrollPhysics applyTo(ScrollPhysics ancestor) {
return new FixedExtentScrollPhysics(parent: buildParent(ancestor));
}
public override Simulation createBallisticSimulation(ScrollMetrics position, float velocity) {
D.assert(
position is _FixedExtentScrollPosition,
() => "FixedExtentScrollPhysics can only be used with Scrollables that uses " +
"the FixedExtentScrollController"
);
_FixedExtentScrollPosition metrics = (_FixedExtentScrollPosition) position;
if ((velocity <= 0.0f && metrics.pixels <= metrics.minScrollExtent) ||
(velocity >= 0.0f && metrics.pixels >= metrics.maxScrollExtent)) {
return base.createBallisticSimulation(metrics, velocity);
}
Simulation testFrictionSimulation =
base.createBallisticSimulation(metrics, velocity);
if (testFrictionSimulation != null
&& (testFrictionSimulation.x(float.PositiveInfinity) == metrics.minScrollExtent
|| testFrictionSimulation.x(float.PositiveInfinity) == metrics.maxScrollExtent)) {
return base.createBallisticSimulation(metrics, velocity);
}
int settlingItemIndex = ListWheelScrollViewUtils._getItemFromOffset(
offset: testFrictionSimulation?.x(float.PositiveInfinity) ?? metrics.pixels,
itemExtent: metrics.itemExtent,
minScrollExtent: metrics.minScrollExtent,
maxScrollExtent: metrics.maxScrollExtent
);
float settlingPixels = settlingItemIndex * metrics.itemExtent;
if (velocity.abs() < tolerance.velocity
&& (settlingPixels - metrics.pixels).abs() < tolerance.distance) {
return null;
}
if (settlingItemIndex == metrics.itemIndex) {
return new SpringSimulation(
spring,
metrics.pixels,
settlingPixels,
velocity,
tolerance: tolerance
);
}
return FrictionSimulation.through(
metrics.pixels,
settlingPixels,
velocity,
tolerance.velocity * velocity.sign()
);
}
}
public class ListWheelScrollView : StatefulWidget {
public ListWheelScrollView(
List<Widget> children,
float itemExtent,
Key key = null,
ScrollController controller = null,
ScrollPhysics physics = null,
float diameterRatio = RenderListWheelViewport.defaultDiameterRatio,
float perspective = RenderListWheelViewport.defaultPerspective,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
float overAndUnderCenterOpacity = 1.0f,
float squeeze = 1.0f,
ValueChanged<int> onSelectedItemChanged = null,
bool clipToSize = true,
bool renderChildrenOutsideViewport = false
) : base(key: key) {
//D.assert(children != null);
D.assert(diameterRatio > 0.0, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(perspective > 0);
D.assert(perspective <= 0.01f, () => RenderListWheelViewport.perspectiveTooHighMessage);
D.assert(magnification > 0);
D.assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1);
D.assert(itemExtent > 0);
D.assert(squeeze > 0);
D.assert(
!renderChildrenOutsideViewport || !clipToSize,
() => RenderListWheelViewport.clipToSizeAndRenderChildrenOutsideViewportConflict
);
childDelegate = new ListWheelChildListDelegate(children: children);
this.overAndUnderCenterOpacity = overAndUnderCenterOpacity;
this.itemExtent = itemExtent;
this.squeeze = squeeze;
this.controller = controller;
this.physics = physics;
this.diameterRatio = diameterRatio;
this.perspective = perspective;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.onSelectedItemChanged = onSelectedItemChanged;
this.clipToSize = clipToSize;
this.renderChildrenOutsideViewport = renderChildrenOutsideViewport;
}
public ListWheelScrollView (
float itemExtent,
Key key = null,
ScrollController controller = null,
ScrollPhysics physics = null,
float diameterRatio = RenderListWheelViewport.defaultDiameterRatio,
float perspective = RenderListWheelViewport.defaultPerspective,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
float squeeze = 1.0f,
ValueChanged<int> onSelectedItemChanged = null,
float overAndUnderCenterOpacity = 1.0f,
bool clipToSize = true,
bool renderChildrenOutsideViewport = false,
ListWheelChildDelegate childDelegate = null
) : base(key: key) {
D.assert(childDelegate != null);
D.assert(diameterRatio > 0.0, ()=>RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(perspective > 0);
D.assert(perspective <= 0.01,()=> RenderListWheelViewport.perspectiveTooHighMessage);
D.assert(magnification > 0);
D.assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1);
D.assert(itemExtent != null);
D.assert(itemExtent > 0);
D.assert(squeeze > 0);
D.assert(
!renderChildrenOutsideViewport || !clipToSize,()=>
RenderListWheelViewport.clipToSizeAndRenderChildrenOutsideViewportConflict
);
this.controller = controller;
this.physics = physics;
this.diameterRatio = diameterRatio;
this.perspective = perspective;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.overAndUnderCenterOpacity = overAndUnderCenterOpacity;
this.itemExtent = itemExtent;
this.squeeze = squeeze;
this.onSelectedItemChanged = onSelectedItemChanged;
this.clipToSize = clipToSize;
this.renderChildrenOutsideViewport = renderChildrenOutsideViewport;
this.childDelegate = childDelegate;
}
public readonly ScrollController controller;
public readonly ScrollPhysics physics;
public readonly float diameterRatio;
public readonly float perspective;
public readonly float offAxisFraction;
public readonly bool useMagnifier;
public readonly float magnification;
public readonly float itemExtent;
public readonly float overAndUnderCenterOpacity;
public readonly float squeeze;
public readonly ValueChanged<int> onSelectedItemChanged;
public readonly bool clipToSize;
public readonly bool renderChildrenOutsideViewport;
public ListWheelChildDelegate childDelegate;
public override State createState() {
return new _ListWheelScrollViewState();
}
}
class _ListWheelScrollViewState : State<ListWheelScrollView> {
int _lastReportedItemIndex = 0;
ScrollController scrollController;
public override void initState() {
base.initState();
scrollController = widget.controller ?? new FixedExtentScrollController();
if (widget.controller is FixedExtentScrollController controller) {
_lastReportedItemIndex = controller.initialItem;
}
}
public override void didUpdateWidget(StatefulWidget oldWidget) {
base.didUpdateWidget(oldWidget);
if (widget.controller != null && widget.controller != scrollController) {
ScrollController oldScrollController = scrollController;
SchedulerBinding.instance.addPostFrameCallback((_) => { oldScrollController.dispose(); });
scrollController = widget.controller;
}
}
public override Widget build(BuildContext context) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification.depth == 0
&& widget.onSelectedItemChanged != null
&& notification is ScrollUpdateNotification
&& notification.metrics is FixedExtentMetrics metrics) {
int currentItemIndex = metrics.itemIndex;
if (currentItemIndex != _lastReportedItemIndex) {
_lastReportedItemIndex = currentItemIndex;
int trueIndex = widget.childDelegate.trueIndexOf(currentItemIndex);
widget.onSelectedItemChanged(trueIndex);
}
}
return false;
},
child: new _FixedExtentScrollable(
controller: scrollController,
physics: widget.physics,
itemExtent: widget.itemExtent,
viewportBuilder: (BuildContext _context, ViewportOffset _offset) => {
return new ListWheelViewport(
diameterRatio: widget.diameterRatio,
perspective: widget.perspective,
offAxisFraction: widget.offAxisFraction,
useMagnifier: widget.useMagnifier,
magnification: widget.magnification,
overAndUnderCenterOpacity: widget.overAndUnderCenterOpacity,
itemExtent: widget.itemExtent ,
squeeze: widget.squeeze,
clipToSize: widget.clipToSize,
renderChildrenOutsideViewport: widget.renderChildrenOutsideViewport,
offset: _offset,
childDelegate: widget.childDelegate
);
}
)
);
}
}
public class ListWheelElement : RenderObjectElement, IListWheelChildManager {
public ListWheelElement(ListWheelViewport widget) : base(widget) { }
public new ListWheelViewport widget {
get { return (ListWheelViewport) base.widget; }
}
public new RenderListWheelViewport renderObject {
get { return (RenderListWheelViewport)base.renderObject; }
}
readonly Dictionary<int, Widget> _childWidgets = new Dictionary<int, Widget>();
readonly SplayTree<int, Element> _childElements = new SplayTree<int, Element>();
public override void update(Widget newWidget) {
ListWheelViewport oldWidget = widget;
base.update(newWidget);
ListWheelChildDelegate newDelegate = ((ListWheelViewport) newWidget).childDelegate;
ListWheelChildDelegate oldDelegate = oldWidget.childDelegate;
if (newDelegate != oldDelegate &&
(newDelegate.GetType() != oldDelegate.GetType() || newDelegate.shouldRebuild(oldDelegate))) {
performRebuild();
}
}
public int? childCount {
get { return widget.childDelegate.estimatedChildCount; }
}
protected override void performRebuild() {
_childWidgets.Clear();
base.performRebuild();
if (_childElements.isEmpty()) {
return;
}
int firstIndex = _childElements.First()?.Key ?? 0;
int lastIndex = _childElements.Last()?.Key ?? _childElements.Count;
for (int index = firstIndex; index <= lastIndex; ++index) {
Element newChild = updateChild(_childElements[index], retrieveWidget(index), index);
if (newChild != null) {
_childElements[index] = newChild;
}
else {
_childElements.Remove(index);
}
}
}
Widget retrieveWidget(int index) {
return _childWidgets.putIfAbsent(index,
() => { return widget.childDelegate.build(this, index); });
}
public bool childExistsAt(int index) {
return retrieveWidget(index) != null;
}
public void createChild(int index, RenderBox after) {
owner.buildScope(this, () => {
bool insertFirst = after == null;
D.assert(insertFirst || _childElements.getOrDefault(index - 1) != null);
Element newChild = updateChild(_childElements.getOrDefault(index), retrieveWidget(index), index);
if (newChild != null) {
_childElements[index] = newChild;
}
else {
_childElements.Remove(index);
}
});
}
public void removeChild(RenderBox child) {
int index = renderObject.indexOf(child);
owner.buildScope(this, () => {
D.assert(_childElements.ContainsKey(index));
Element result = updateChild(_childElements[index], null, index);
D.assert(result == null);
_childElements.Remove(index);
D.assert(!_childElements.ContainsKey(index));
});
}
protected override Element updateChild(Element child, Widget newWidget, object newSlot) {
ListWheelParentData oldParentData = (ListWheelParentData) child?.renderObject?.parentData;
Element newChild = base.updateChild(child, newWidget, newSlot);
ListWheelParentData newParentData = (ListWheelParentData) newChild?.renderObject?.parentData;
if (newParentData != null) {
newParentData.index = (int) newSlot;
if (oldParentData != null) {
newParentData.offset = oldParentData.offset;
}
}
return newChild;
}
protected override void insertChildRenderObject(RenderObject child, object slot) {
RenderListWheelViewport renderObject = this.renderObject;
D.assert(renderObject.debugValidateChild(child));
int slotNum = (int) slot;
renderObject.insert(child as RenderBox, after: _childElements.getOrDefault(slotNum - 1)?.renderObject as RenderBox);
D.assert(renderObject == this.renderObject);
}
protected override void moveChildRenderObject(RenderObject child, dynamic slot) {
string moveChildRenderObjectErrorMessage =
"Currently we maintain the list in contiguous increasing order, so " +
"moving children around is not allowed.";
D.assert(false, () => moveChildRenderObjectErrorMessage);
}
protected override void removeChildRenderObject(RenderObject child) {
D.assert(child.parent == renderObject);
renderObject.remove((RenderBox) child);
}
public override void visitChildren(ElementVisitor visitor) {
foreach (var item in _childElements) {
visitor(item.Value);
}
}
internal override void forgetChild(Element child) {
_childElements.Remove((int) (child.slot));
base.forgetChild(child);
}
}
public class ListWheelViewport : RenderObjectWidget {
public ListWheelViewport(
Key key = null,
float diameterRatio = RenderListWheelViewport.defaultDiameterRatio,
float perspective = RenderListWheelViewport.defaultPerspective,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
float overAndUnderCenterOpacity = 1.0f,
float? itemExtent = null,
float squeeze = 1.0f,
bool clipToSize = true,
bool renderChildrenOutsideViewport = false,
ViewportOffset offset = null,
ListWheelChildDelegate childDelegate = null
) : base(key: key) {
D.assert(childDelegate != null);
D.assert(offset != null);
D.assert(diameterRatio > 0, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(perspective > 0);
D.assert(perspective <= 0.01, () => RenderListWheelViewport.perspectiveTooHighMessage);
D.assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1);
D.assert(itemExtent != null);
D.assert(itemExtent > 0);
D.assert(
!renderChildrenOutsideViewport || !clipToSize,
() => RenderListWheelViewport.clipToSizeAndRenderChildrenOutsideViewportConflict
);
this.diameterRatio = diameterRatio;
this.perspective = perspective;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.overAndUnderCenterOpacity = overAndUnderCenterOpacity;
this.itemExtent = itemExtent;
this.squeeze = squeeze;
this.clipToSize = clipToSize;
this.renderChildrenOutsideViewport = renderChildrenOutsideViewport;
this.offset = offset;
this.childDelegate = childDelegate;
}
public readonly float diameterRatio;
public readonly float perspective;
public readonly float offAxisFraction;
public readonly bool useMagnifier;
public readonly float magnification;
public readonly float overAndUnderCenterOpacity;
public readonly float? itemExtent;
public readonly float squeeze;
public readonly bool clipToSize;
public readonly bool renderChildrenOutsideViewport;
public readonly ViewportOffset offset;
public readonly ListWheelChildDelegate childDelegate;
public override Element createElement() {
return new ListWheelElement(this);
}
public override RenderObject createRenderObject(BuildContext context) {
ListWheelElement childManager = (ListWheelElement) context;
return new RenderListWheelViewport(
childManager: childManager,
offset: offset,
diameterRatio: diameterRatio,
perspective: perspective,
offAxisFraction: offAxisFraction,
useMagnifier: useMagnifier,
magnification: magnification,
overAndUnderCenterOpacity: overAndUnderCenterOpacity,
itemExtent: itemExtent ?? 1.0f ,
squeeze: squeeze,
clipToSize: clipToSize,
renderChildrenOutsideViewport: renderChildrenOutsideViewport
);
}
public override void updateRenderObject(BuildContext context, RenderObject renderObject) {
var viewport = (RenderListWheelViewport) renderObject;
viewport.offset = offset;
viewport.diameterRatio = diameterRatio;
viewport.perspective = perspective;
viewport.offAxisFraction = offAxisFraction;
viewport.useMagnifier = useMagnifier;
viewport.magnification = magnification;
viewport.overAndUnderCenterOpacity = overAndUnderCenterOpacity;
viewport.itemExtent = itemExtent ?? 1.0f;
viewport.squeeze = squeeze;
viewport.clipToSize = clipToSize;
viewport.renderChildrenOutsideViewport = renderChildrenOutsideViewport;
}
}
}