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using Android.OS;
using Android.Support.V4.App;
using Java.Lang;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Platform.Android.AppCompat
{
internal class FormsFragmentPagerAdapter<T> : FragmentPagerAdapter where T : Page
{
MultiPage<T> _page;
public FormsFragmentPagerAdapter(MultiPage<T> page, FragmentManager fragmentManager) : base(fragmentManager)
{
_page = page;
}
public override int Count => CountOverride;
public int CountOverride { get; set; }
public override Fragment GetItem(int position)
{
return FragmentContainer.CreateInstance(_page.Children[position]);
}
public override long GetItemId(int position)
{
return _page.Children[position].GetHashCode();
}
public override int GetItemPosition(Object objectValue)
{
var fragContainer = objectValue as FragmentContainer;
if (fragContainer != null && fragContainer.Page != null)
{
int index = _page.Children.IndexOf(fragContainer.Page);
if (index >= 0)
return index;
}
return PositionNone;
}
public override ICharSequence GetPageTitleFormatted(int position)
{
return new String(_page.Children[position].Title);
}
// http://stackoverflow.com/questions/18642890/fragmentstatepageradapter-with-childfragmentmanager-fragmentmanagerimpl-getfra/19099987#19099987
public override void RestoreState(IParcelable state, ClassLoader loader)
{
}
protected override void Dispose(bool disposing)
{
if (disposing)
_page = null;
base.Dispose(disposing);
}
}
}
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