public static ListWheelScrollView useDelegate(
float itemExtent,
List <Widget> children = null,
ListWheelChildDelegate childDelegate = null,
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,
ValueChanged <int> onSelectedItemChanged = null,
bool clipToSize = true,
bool renderChildrenOutsideViewport = false
)
{
return(new ListWheelScrollView(
itemExtent: itemExtent,
children: children,
childDelegate: childDelegate,
key: key,
controller: controller,
physics: physics,
diameterRatio: diameterRatio,
perspective: perspective,
offAxisFraction: offAxisFraction,
useMagnifier: useMagnifier,
magnification: magnification,
onSelectedItemChanged: onSelectedItemChanged,
clipToSize: clipToSize,
renderChildrenOutsideViewport: renderChildrenOutsideViewport
));
}
public CupertinoPicker(
float itemExtent,
ValueChanged <int> onSelectedItemChanged,
List <Widget> children = null,
Key key = null,
float diameterRatio = CupertinoPickerUtils._kDefaultDiameterRatio,
Color backgroundColor = null,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
FixedExtentScrollController scrollController = null,
bool looping = false,
ListWheelChildDelegate childDelegate = null
) : base(key: key)
{
D.assert(children != null || childDelegate != null);
D.assert(diameterRatio > 0.0, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(magnification > 0);
D.assert(itemExtent > 0);
this.childDelegate = childDelegate ?? (looping
? (ListWheelChildDelegate) new ListWheelChildLoopingListDelegate(
children: children)
: (ListWheelChildDelegate) new ListWheelChildListDelegate(children: children));
this.itemExtent = itemExtent;
this.onSelectedItemChanged = onSelectedItemChanged;
this.diameterRatio = diameterRatio;
this.backgroundColor = backgroundColor ?? CupertinoPickerUtils._kDefaultBackground;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.scrollController = scrollController;
}
public override void update(Widget newWidget)
{
ListWheelViewport oldWidget = this.widget;
base.update(newWidget);
ListWheelChildDelegate newDelegate = ((ListWheelViewport)newWidget).childDelegate;
ListWheelChildDelegate oldDelegate = oldWidget.childDelegate;
if (newDelegate != oldDelegate &&
(newDelegate.GetType() != oldDelegate.GetType() || newDelegate.shouldRebuild(oldDelegate)))
{
this.performRebuild();
}
}
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 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 bool shouldRebuild(ListWheelChildDelegate oldDelegate)
{
return(this.children != ((ListWheelChildListDelegate)oldDelegate).children);
}
public bool shouldRebuild(ListWheelChildDelegate oldDelegate)
{
return(this.builder != ((ListWheelChildBuilderDelegate)oldDelegate).builder ||
this.childCount != ((ListWheelChildBuilderDelegate)oldDelegate).childCount);
}
