public override Object InstantiateItem(ViewGroup container, int position)
{
ContentPage child = _page.Children.ElementAt(position);
if (AppCompat.Platform.GetRenderer(child) == null)
{
AppCompat.Platform.SetRenderer(child, AppCompat.Platform.CreateRenderer(child, _context));
}
IVisualElementRenderer renderer = AppCompat.Platform.GetRenderer(child);
renderer.View.RemoveFromParent();
ViewGroup frame = new PageContainer(_context, renderer);
container.AddView(frame);
return(new ObjectJavaBox <Tuple <ViewGroup, Page, int> >(new Tuple <ViewGroup, Page, int>(frame, child, position)));
}
protected virtual void AddChildView(VisualElement childView)
{
_pageContainer = null;
Page page = childView as NavigationPage ?? (Page)(childView as TabbedPage);
if (page == null)
{
// The thing we're adding is not a NavigationPage or TabbedPage, so we can just use the old AddChildView
if (_currentFragment != null)
{
if (!_parent.IsAttachedToRoot())
{
return;
}
// But first, if the previous occupant of this container was a fragment, we need to remove it properly
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
transaction.RemoveEx(_currentFragment);
transaction.SetTransitionEx((int)FragmentTransit.None);
if (IsAttachedToWindow)
{
ExecuteTransaction(transaction);
}
else
{
_transaction = transaction;
}
_currentFragment = null;
}
IVisualElementRenderer renderer = APlatform.GetRenderer(childView);
if (renderer == null)
{
APlatform.SetRenderer(childView, renderer = APlatform.CreateRenderer(childView, Context));
}
if (renderer.View.Parent != this)
{
if (renderer.View.Parent != null)
{
renderer.View.RemoveFromParent();
}
SetDefaultBackgroundColor(renderer);
AddView(renderer.View);
renderer.UpdateLayout();
}
}
else
{
if (!_parent.IsAttachedToRoot())
{
return;
}
// The renderers for NavigationPage and TabbedPage both host fragments, so they need to be wrapped in a
// FragmentContainer in order to get isolated fragment management
Fragment fragment = FragmentContainer.CreateInstance(page);
var fc = fragment as FragmentContainer;
fc?.SetOnCreateCallback(pc =>
{
_pageContainer = pc;
UpdateFlowDirection();
SetDefaultBackgroundColor(pc.Child);
});
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
if (_currentFragment != null)
{
transaction.RemoveEx(_currentFragment);
}
transaction.AddEx(Id, fragment);
transaction.SetTransitionEx((int)FragmentTransit.None);
if (IsAttachedToWindow)
{
ExecuteTransaction(transaction);
}
else
{
_transaction = transaction;
}
_currentFragment = fragment;
}
}