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using System.Threading.Tasks;
using AppKit;
using PointF = CoreGraphics.CGPoint;
namespace Xamarin.Forms.Platform.MacOS
{
internal static class NSScrollViewExtensions
{
public static Task ScrollToPositionAsync(this NSScrollView scrollView, PointF point, bool animate,
double duration = 0.5)
{
if (!animate)
{
var nsView = scrollView.DocumentView as NSView;
nsView?.ScrollPoint(point);
return Task.FromResult(true);
}
TaskCompletionSource<bool> source = new TaskCompletionSource<bool>();
NSAnimationContext.BeginGrouping();
NSAnimationContext.CurrentContext.CompletionHandler += () => { source.TrySetResult(true); };
NSAnimationContext.CurrentContext.Duration = duration;
var animator = scrollView.ContentView.Animator as NSView;
animator?.SetBoundsOrigin(point);
NSAnimationContext.EndGrouping();
return source.Task;
}
}
}
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