protected virtual void ShowViewPagerFragment(
Type view,
MvxViewPagerFragmentPresentationAttribute attribute,
MvxViewModelRequest request)
{
if (attribute.ActivityHostViewModelType == null)
{
attribute.ActivityHostViewModelType = GetCurrentActivityViewModelType();
}
var currentHostViewModelType = GetCurrentActivityViewModelType();
if (attribute.ActivityHostViewModelType != currentHostViewModelType)
{
_pendingRequest = request;
ShowHostActivity(attribute);
}
else
{
var viewPager = CurrentActivity.FindViewById <ViewPager>(attribute.ViewPagerResourceId);
if (viewPager != null)
{
if (viewPager.Adapter is MvxCachingFragmentStatePagerAdapter adapter)
{
if (adapter.FragmentsInfo.Any(f => f.Tag == attribute.Title))
{
var index = adapter.FragmentsInfo.FindIndex(f => f.Tag == attribute.Title);
viewPager.SetCurrentItem(index > -1 ? index : 0, true);
}
else
{
if (request is MvxViewModelInstanceRequest instanceRequest)
{
adapter.FragmentsInfo.Add(new MvxViewPagerFragmentInfo(attribute.Title, attribute.ViewType, instanceRequest.ViewModelInstance));
}
else
{
adapter.FragmentsInfo.Add(new MvxViewPagerFragmentInfo(attribute.Title, attribute.ViewType, attribute.ViewModelType));
}
adapter.NotifyDataSetChanged();
}
}
else
{
var fragments = new List <MvxViewPagerFragmentInfo>();
if (request is MvxViewModelInstanceRequest instanceRequest)
{
fragments.Add(new MvxViewPagerFragmentInfo(attribute.Title, attribute.ViewType, instanceRequest.ViewModelInstance));
}
else
{
fragments.Add(new MvxViewPagerFragmentInfo(attribute.Title, attribute.ViewType, attribute.ViewModelType));
}
if (attribute.FragmentHostViewType != null)
{
var fragment = GetFragmentByViewType(attribute.FragmentHostViewType);
if (fragment == null)
{
throw new MvxException("Fragment not found", attribute.FragmentHostViewType.Name);
}
viewPager.Adapter = new MvxCachingFragmentStatePagerAdapter(CurrentActivity, fragment.ChildFragmentManager, fragments);
}
else
{
viewPager.Adapter = new MvxCachingFragmentStatePagerAdapter(CurrentActivity, CurrentFragmentManager, fragments);
}
}
}
else
{
throw new MvxException("ViewPager not found");
}
}
}
public override MvxBasePresentationAttribute GetPresentationAttribute(MvxViewModelRequest request)
{
var viewType = ViewsContainer.GetViewType(request.ViewModelType);
var overrideAttribute = GetOverridePresentationAttribute(request, viewType);
if (overrideAttribute != null)
{
return(overrideAttribute);
}
IList <MvxBasePresentationAttribute> attributes = viewType.GetCustomAttributes <MvxBasePresentationAttribute>(true).ToList();
if (attributes != null && attributes.Count > 0)
{
MvxBasePresentationAttribute attribute = null;
if (attributes.Count > 1)
{
var fragmentAttributes = attributes.OfType <MvxFragmentPresentationAttribute>();
// check if fragment can be displayed as child fragment first
foreach (var item in fragmentAttributes.Where(att => att.FragmentHostViewType != null))
{
var fragmentHost = GetFragmentByViewType(item.FragmentHostViewType);
// if the fragment exists, is on top, and (has the ContentId or the attribute is for ViewPager), then use it as current attribute
if (fragmentHost != null &&
fragmentHost.IsVisible &&
(fragmentHost.View.FindViewById(item.FragmentContentId) != null || item is MvxViewPagerFragmentPresentationAttribute))
{
attribute = item;
break;
}
}
// if attribute is still null, check if fragment can be displayed in current activity
if (attribute == null)
{
var currentActivityHostViewModelType = GetCurrentActivityViewModelType();
foreach (var item in fragmentAttributes.Where(att => att.ActivityHostViewModelType != null && att.ActivityHostViewModelType == currentActivityHostViewModelType))
{
// check for MvxTabLayoutPresentationAttribute
if (item is MvxTabLayoutPresentationAttribute tabLayoutAttribute &&
CurrentActivity.FindViewById(tabLayoutAttribute.TabLayoutResourceId) != null)
{
attribute = item;
break;
}
// check for MvxViewPagerFragmentPresentationAttribute
if (item is MvxViewPagerFragmentPresentationAttribute viewPagerAttribute &&
CurrentActivity.FindViewById(viewPagerAttribute.ViewPagerResourceId) != null)
{
attribute = item;
break;
}
// check for MvxFragmentPresentationAttribute
if (CurrentActivity.FindViewById(item.FragmentContentId) != null)
{
attribute = item;
break;
}
}
}
}
if (attribute == null)
{
attribute = attributes.FirstOrDefault();
}
attribute.ViewType = viewType;
return(attribute);
}
return(CreatePresentationAttribute(request.ViewModelType, viewType));
}
public override MvxBasePresentationAttribute GetPresentationAttribute(Type viewModelType)
{
var viewType = ViewsContainer.GetViewType(viewModelType);
var overrideAttribute = GetOverridePresentationAttribute(viewModelType, viewType);
if (overrideAttribute != null)
{
return(overrideAttribute);
}
IList <MvxBasePresentationAttribute> attributes = viewType.GetCustomAttributes <MvxBasePresentationAttribute>(true).ToList();
if (attributes != null && attributes.Count > 0)
{
MvxBasePresentationAttribute attribute = null;
if (attributes.Count > 1)
{
var fragmentAttributes = attributes.OfType <MvxFragmentPresentationAttribute>();
// check if fragment can be displayed as child fragment first
foreach (var item in fragmentAttributes.Where(att => att.FragmentHostViewType != null))
{
var fragment = GetFragmentByViewType(item.FragmentHostViewType);
// if the fragment exists, and is on top, then use the current attribute
if (fragment != null && fragment.IsVisible && fragment.View.FindViewById(item.FragmentContentId) != null)
{
attribute = item;
break;
}
}
// if attribute is still null, check if fragment can be displayed in current activity
if (attribute == null)
{
var currentActivityHostViewModelType = GetCurrentActivityViewModelType();
foreach (var item in fragmentAttributes.Where(att => att.ActivityHostViewModelType != null))
{
if (CurrentActivity.FindViewById(item.FragmentContentId) != null && item.ActivityHostViewModelType == currentActivityHostViewModelType)
{
attribute = item;
break;
}
}
}
}
if (attribute == null)
{
attribute = attributes.FirstOrDefault();
}
attribute.ViewType = viewType;
return(attribute);
}
return(CreatePresentationAttribute(viewModelType, viewType));
}
protected virtual Task <bool> ShowViewPagerFragment(
Type view,
MvxViewPagerFragmentPresentationAttribute attribute,
MvxViewModelRequest request)
{
// if the attribute doesn't supply any host, assume current activity!
if (attribute.FragmentHostViewType == null && attribute.ActivityHostViewModelType == null)
{
attribute.ActivityHostViewModelType = GetCurrentActivityViewModelType();
}
ViewPager viewPager = null;
FragmentManager fragmentManager = null;
// check for a ViewPager inside a Fragment
if (attribute.FragmentHostViewType != null)
{
var fragment = GetFragmentByViewType(attribute.FragmentHostViewType);
if (fragment == null)
{
throw new MvxException("Fragment not found", attribute.FragmentHostViewType.Name);
}
if (fragment.View == null)
{
throw new MvxException("Fragment.View is null. Please consider calling Navigate later in your code",
attribute.FragmentHostViewType.Name);
}
viewPager = fragment.View.FindViewById <ViewPager>(attribute.ViewPagerResourceId);
fragmentManager = fragment.ChildFragmentManager;
}
// check for a ViewPager inside an Activity
if (attribute.ActivityHostViewModelType != null)
{
var currentActivityViewModelType = GetCurrentActivityViewModelType();
// if the host Activity is not the top-most Activity, then show it before proceeding, and return false for now
if (attribute.ActivityHostViewModelType != currentActivityViewModelType)
{
_pendingRequest = request;
ShowHostActivity(attribute);
return(Task.FromResult(false));
}
viewPager = CurrentActivity.FindViewById <ViewPager>(attribute.ViewPagerResourceId);
fragmentManager = CurrentFragmentManager;
}
// no more cases to check. Just throw if ViewPager wasn't found
if (viewPager == null)
{
throw new MvxException("ViewPager not found");
}
var tag = attribute.Tag ?? attribute.ViewType.FragmentJavaName();
if (viewPager.Adapter is MvxCachingFragmentStatePagerAdapter adapter)
{
if (request is MvxViewModelInstanceRequest instanceRequest)
{
adapter.FragmentsInfo.Add(new MvxViewPagerFragmentInfo(
attribute.Title, tag, attribute.ViewType, instanceRequest.ViewModelInstance));
}
else
{
adapter.FragmentsInfo.Add(new MvxViewPagerFragmentInfo(
attribute.Title, tag, attribute.ViewType, attribute.ViewModelType));
}
adapter.NotifyDataSetChanged();
}
else
{
var fragments = new List <MvxViewPagerFragmentInfo>();
if (request is MvxViewModelInstanceRequest instanceRequest)
{
fragments.Add(new MvxViewPagerFragmentInfo(
attribute.Title, tag, attribute.ViewType, instanceRequest.ViewModelInstance));
}
else
{
fragments.Add(new MvxViewPagerFragmentInfo(
attribute.Title, tag, attribute.ViewType, attribute.ViewModelType));
}
viewPager.Adapter = new MvxCachingFragmentStatePagerAdapter(CurrentActivity, fragmentManager, fragments);
}
return(Task.FromResult(true));
}