Class VirtualScroll
this control gets a view and draws it on a virtual scrolling plane
public class VirtualScroll : SkiaScroll, INotifyPropertyChanged, IEffectControlProvider, IToolTipElement, IContextFlyoutElement, IAnimatable, IVisualElementController, IElementController, IView, ITransform, IElement, IVisualTreeElement, IContainer, IList<IView>, ICollection<IView>, IEnumerable<IView>, IEnumerable, IHasAfterEffects, ISkiaControl, IDrawnBase, ICanBeUpdatedWithContext, ICanBeUpdated, ISkiaDisposable, IDisposable, ISkiaGestureListener, IDefinesViewport, IWithContent- Inheritance
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VirtualScroll
- Implements
- Derived
- Inherited Members
- Extension Methods
Constructors
VirtualScroll()
public VirtualScroll()Properties
IsContentActive
protected override bool IsContentActive { get; }Property Value
UseVirtual
public override bool UseVirtual { get; }Property Value
Methods
GetMeasuredView(int, SKRect, float)
Returns a view for a specific index. Actually used for virtual scroll.
protected virtual SkiaLayout GetMeasuredView(int index, SKRect destination, float scale)Parameters
Returns
OnMeasured()
protected override void OnMeasured()PositionViewport(SKRect, SKPoint, float, float, bool)
Input offset parameters in PIXELS. This is called inside Draw, only if need reposition viewport. Here we can construct anything according current offset before painting. Creates a valid ViewportRect inside.
protected override bool PositionViewport(SKRect destination, SKPoint offsetPixels, float viewportScale, float scale, bool forceSyncOffsets)Parameters
Returns
- bool
Whether we changed viewport and cache changed
SetContentSize()
protected virtual void SetContentSize()SetDetectIndexChildPoint(RelativePositionType)
protected override void SetDetectIndexChildPoint(RelativePositionType option = RelativePositionType.Start)Parameters
optionRelativePositionType