private MvxBottomNavigationView FindMvxBottomNavigationViewInFragmentPresentation(MvxBottomNavigationViewPresentationAttribute pagerFragmentAttribute)
{
MvxBottomNavigationView bottomNavigationView = null;
// check for a ViewPager inside a Fragment
if (pagerFragmentAttribute.FragmentHostViewType != null)
{
var fragment = GetFragmentByViewType(pagerFragmentAttribute.FragmentHostViewType);
bottomNavigationView = fragment.View.FindViewById <MvxBottomNavigationView>(pagerFragmentAttribute.BottomNavigationResourceId);
}
// check for a ViewPager inside an Activity
if (bottomNavigationView == null && pagerFragmentAttribute.ActivityHostViewModelType != null)
{
bottomNavigationView = CurrentActivity.FindViewById <MvxBottomNavigationView>(pagerFragmentAttribute.BottomNavigationResourceId);
}
return(bottomNavigationView);
}
public override Task <bool> ChangePresentation(MvxPresentationHint hint)
{
if (hint is MvxPagePresentationHint pagePresentationHint)
{
var request = new MvxViewModelRequest(pagePresentationHint.ViewModel);
var attribute = GetPresentationAttribute(request);
if (attribute is MvxBottomNavigationViewPresentationAttribute bottomNavigationAttribute)
{
MvxBottomNavigationView bottomNavigationView = FindMvxBottomNavigationViewInFragmentPresentation(bottomNavigationAttribute);
if (bottomNavigationView != null)
{
var menuItem = bottomNavigationView.FindItemByViewModel(pagePresentationHint.ViewModel);
if (menuItem == null)
{
//MvvmCross.MvxAndroidLog.Instance.Trace("Did not find a menu item which corresponds to {0}, skipping presentation change...", pagePresentationHint.ViewModel);
return(Task.FromResult(false));
}
// If we are deeper in our back stack, we want to make sure that we remove the stack
if (CurrentFragmentManager.BackStackEntryCount > 0)
{
var name = CurrentFragmentManager.GetBackStackEntryAt(0).Name;
CurrentFragmentManager.PopBackStackImmediate(name, 1);
}
PerformShowFragmentTransaction(CurrentFragmentManager, bottomNavigationAttribute, new MvxViewModelRequest(pagePresentationHint.ViewModel));
var item = bottomNavigationView.FindItemByViewModel(pagePresentationHint.ViewModel);
item.SetChecked(true);
return(Task.FromResult(true));
}
}
}
return(base.ChangePresentation(hint));
}
