public override IParcelable SaveState()
{
Bundle state = null;
if (_savedState.Count > 0)
{
state = new Bundle();
var fss = new Fragment.SavedState[_savedState.Count];
_savedState.CopyTo(fss, 0);
state.PutParcelableArrayList("states", fss);
}
for (var i = 0; i < _fragments.Count; i++)
{
var f = _fragments[i];
if (f != null && f.IsAdded)
{
if (state == null)
{
state = new Bundle();
}
var key = "f" + i;
_fm.PutFragment(state, key, f);
}
}
return(state);
}
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
var fragmentInfo = FragmentsInfo[position];
var fragmentClass = Class.FromType(fragmentInfo.FragmentType);
var fragment = FragmentFactory.Instantiate(
fragmentClass.ClassLoader,
fragmentClass.Name
);
if (!(fragment is IMvxFragmentView mvxFragment))
{
return(fragment);
}
if (mvxFragment.GetType().IsFragmentCacheable(_activityType) && fragmentSavedState != null)
{
return(fragment);
}
mvxFragment.ViewModel = GetViewModel(fragmentInfo);
fragment.Arguments = GetArguments(fragmentInfo);
return(fragment);
}
public override Object InstantiateItem(ViewGroup container, int position)
{
// If we already have this item instantiated, there is nothing
// to do. This can happen when we are restoring the entire pager
// from its saved state, where the fragment manager has already
// taken care of restoring the fragments we previously had instantiated.
if (_fragments.Count > position)
{
var existingFragment = _fragments.ElementAtOrDefault(position);
if (existingFragment != null)
{
return(existingFragment);
}
}
if (_curTransaction == null)
{
_curTransaction = _fragmentManager.BeginTransaction();
}
var fragmentTag = GetTag(position);
Fragment.SavedState fss = null;
if (_savedState.Count > position)
{
var savedTag = _savedFragmentTags.ElementAtOrDefault(position);
if (string.Equals(fragmentTag, savedTag))
{
fss = _savedState.ElementAtOrDefault(position);
}
}
var fragment = GetItem(position, fss);
if (fss != null)
{
fragment.SetInitialSavedState(fss);
}
#if DEBUG
Mvx.Trace("Adding item #" + position + ": f=" + fragment + " t=" + fragmentTag);
#endif
while (_fragments.Count <= position)
{
_fragments.Add(null);
}
fragment.SetMenuVisibility(false);
fragment.UserVisibleHint = false;
_fragments[position] = fragment;
_curTransaction.Add(container.Id, fragment, fragmentTag);
return(fragment);
}
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
var fragment = base.GetItem(position, fragmentSavedState);
// If the MvxViewPagerFragmentInfo for this position doesn't have the ViewModel, overwrite it with a new MvxViewPagerFragmentInfo that has the ViewModel we just created.
// Not doing this means the ViewModel gets recreated every time the Fragment gets recreated!
if (FragmentsInfo != null && FragmentsInfo.Count > position && fragment is IMvxFragmentView mvxFragment && mvxFragment.ViewModel != null)
{
var oldFragInfo = FragmentsInfo[position];
if (oldFragInfo != null && oldFragInfo.ViewModel == null)
{
var newFragInfo = new MvxViewPagerFragmentInfo(oldFragInfo.Title, oldFragInfo.Tag, oldFragInfo.FragmentType, mvxFragment.ViewModel);
FragmentsInfo[position] = newFragInfo;
}
}
return(fragment);
}
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
var fragmentInfo = FragmentsInfo.ElementAt(position);
var fragment = Fragment.Instantiate(_context, fragmentInfo.FragmentType.FragmentJavaName());
if (!(fragment is IMvxFragmentView mvxFragment))
{
return(fragment);
}
if (mvxFragment.GetType().IsFragmentCacheable(_activityType) && fragmentSavedState != null)
{
return(fragment);
}
mvxFragment.ViewModel = GetViewModel(fragmentInfo);
return(fragment);
}
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
var fragInfo = Fragments.ElementAt(position);
var fragment = Fragment.Instantiate(_context, FragmentJavaName(fragInfo.FragmentType));
var mvxFragment = fragment as MvxFragment;
if (mvxFragment == null)
{
return(fragment);
}
if (mvxFragment.GetType().IsFragmentCacheable() && fragmentSavedState != null)
{
return(fragment);
}
var viewModel = CreateViewModel(position);
mvxFragment.ViewModel = viewModel;
return(fragment);
}
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
var fragInfo = FragmentsInfo.ElementAt(position);
var fragment = Fragment.Instantiate(_context, FragmentJavaName(fragInfo.FragmentType));
var mvxFragment = fragment as IMvxFragmentView;
if (mvxFragment == null)
{
return(fragment);
}
if (mvxFragment.GetType().IsFragmentCacheable(Mvx.Resolve <IMvxAndroidCurrentTopActivity>().Activity.GetType()) && fragmentSavedState != null)
{
return(fragment);
}
var viewModel = fragInfo.ViewModel ?? CreateViewModel(position);
mvxFragment.ViewModel = viewModel;
return(fragment);
}
public abstract Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null);
public override Fragment GetItem(int position, Fragment.SavedState fragmentSavedState = null)
{
return(_fragmentInfos[position].Fragment);
}
public override Java.Lang.Object InstantiateItem(ViewGroup container, int position)
{
// If we already have this item instantiated, there is nothing
// to do. This can happen when we are restoring the entire pager
// from its saved state, where the fragment manager has already
// taken care of restoring the fragments we previously had instantiated.
if (_fragments.Count > position)
{
var existingFragment = _fragments.ElementAtOrDefault(position);
if (existingFragment != null)
{
return(existingFragment);
}
}
if (_curTransaction == null)
{
_curTransaction = _fragmentManager.BeginTransaction();
}
var fragmentTag = GetTag(position);
Fragment.SavedState fss = null;
if (_savedState.Count > position)
{
var savedTag = _savedFragmentTags.ElementAtOrDefault(position);
if (string.Equals(fragmentTag, savedTag))
{
fss = _savedState.ElementAtOrDefault(position);
}
}
var fragment = GetItem(position, fss);
if (fss != null)
{
fragment.SetInitialSavedState(fss);
}
//if fragment tag is null let's set it to something meaning full;
if (string.IsNullOrEmpty(fragmentTag))
{
fragmentTag = fragment.GetType().FragmentJavaName();
}
#if DEBUG
MvxLogHost.GetLog <MvxCachingFragmentPagerAdapter>()?.Log(LogLevel.Trace,
"Adding item #{position}: f={fragment} t={tag}", position, fragment, fragmentTag);
#endif
while (_fragments.Count <= position)
{
_fragments.Add(null);
}
fragment.SetMenuVisibility(false);
fragment.UserVisibleHint = false;
_fragments[position] = fragment;
_curTransaction.Add(container.Id, fragment, fragmentTag);
return(fragment);
}