internal async void OnPanGestureUpdated(object sender, PanUpdatedEventArgs e)
{
if (Thumb == null || TrackBar == null || FillBar == null)
{
return;
}
switch (e.StatusType)
{
case GestureStatus.Started:
await TrackBar.FadeTo(FadeEffect, AnimLength);
break;
case GestureStatus.Running:
// Translate and ensure we don't pan beyond the wrapped user interface element bounds.
var x = Math.Max(0, e.TotalX);
if (x > (Width - Thumb.Width))
{
x = (Width - Thumb.Width);
}
// Uncomment this if you want only forward dragging.
// if (e.TotalX < Thumb.TranslationX)
// return;
Thumb.TranslationX = x;
SetLayoutBounds(FillBar, new Rectangle(0, 0, x + Thumb.Width / 2, Height));
break;
case GestureStatus.Completed:
var posX = Thumb.TranslationX;
SetLayoutBounds(FillBar, new Rectangle(0, 0, 0, Height));
// Reset translation applied during the pan
await Task.WhenAll(new Task[]
{
TrackBar.FadeTo(1, AnimLength),
Thumb.TranslateTo(0, 0, AnimLength * 2, Easing.CubicIn),
});
if (posX >= (Width - Thumb.Width - 10 /* keep some margin for error*/))
{
SlideCompleted?.Invoke(this, EventArgs.Empty);
}
break;
}
}
