private void PreviousImage_Tap(object sender, ManipulationCompletedEventArgs e)
{
if (!IsTap(e.TotalManipulation.Translation))
{
return;
}
int index = GetCurrentImageIndex();
if (index > 0)
{
index--;
this.DataContext = _collectionVm.Photos[index];
}
else
{
_collectionVm.PreviousPage(
() =>
{
this.DataContext = _collectionVm.Photos[_collectionVm.Photos.Count - 1];
}
);
}
}
