private static void TabHostItemsSourceChanged(TabHost tabHost, AttachedMemberChangedEventArgs <IEnumerable> arg)
{
var generator = tabHost.GetBindingMemberValue(AttachedMembers.ViewGroup.ItemsSourceGenerator);
if (generator == null)
{
generator = new TabHostItemsSourceGenerator(tabHost);
tabHost.SetBindingMemberValue(AttachedMembers.ViewGroup.ItemsSourceGenerator, generator);
}
generator.SetItemsSource(arg.NewValue);
}
private static void OnTabChanged(Action <TabHostItemsSourceGenerator, object, object, bool, bool> baseAction, TabHostItemsSourceGenerator generator, object oldValue, object newValue, bool clearOldValue, bool setNewValue)
{
FragmentManager fragmentManager = null;
FragmentTransaction ft = null;
if (clearOldValue)
{
var fragment = oldValue as Fragment;
if (fragment == null)
{
baseAction(generator, oldValue, newValue, true, false);
}
else if (fragment.IsAlive())
{
fragmentManager = generator.TabHost.GetFragmentManager();
if (fragmentManager != null)
{
ft = fragmentManager.BeginTransaction().Detach(fragment);
}
}
}
if (setNewValue)
{
var fragment = newValue as Fragment;
if (fragment == null)
{
baseAction(generator, oldValue, newValue, false, true);
}
else
{
if (ft == null)
{
fragmentManager = generator.TabHost.GetFragmentManager();
if (fragmentManager != null)
{
ft = fragmentManager.BeginTransaction();
}
}
if (ft != null)
{
ft = fragment.IsDetached
? ft.Attach(fragment)
: ft.Replace(generator.TabHost.TabContentView.Id, fragment);
}
}
}
ft?.CommitAllowingStateLoss();
fragmentManager?.ExecutePendingTransactions();
}
private static void OnRemoveTab(Action <TabHostItemsSourceGenerator, TabHostItemsSourceGenerator.TabInfo> baseAction, TabHostItemsSourceGenerator generator, TabHostItemsSourceGenerator.TabInfo tab)
{
var fragment = tab.Content as Fragment;
if (fragment == null)
{
baseAction(generator, tab);
return;
}
var fragmentManager = generator.TabHost.GetFragmentManager();
if (fragmentManager == null)
{
return;
}
fragmentManager.BeginTransaction()
.Remove(fragment)
.Commit();
fragmentManager.ExecutePendingTransactions();
}
private static void TabHostItemsSourceChanged(TabHost tabHost, AttachedMemberChangedEventArgs <IEnumerable> arg)
{
TabHostItemsSourceGenerator.GetOrAdd(tabHost).SetItemsSource(arg.NewValue);
}
