public override void OnFragmentResumed(AndroidX.Fragment.App.FragmentManager fm, AndroidX.Fragment.App.Fragment f)
{
if (f is NavigationViewFragment pf)
{
_stackNavigationManager.OnNavigationViewFragmentResumed(fm, pf);
}
AToolbar?nativeToolbar = null;
IToolbar?toolbar = null;
if (_stackNavigationManager.NavigationView?.Toolbar is IToolbar tb &&
tb?.Handler?.NativeView is AToolbar ntb)
{
nativeToolbar = ntb;
toolbar = tb;
}
// Wire up the toolbar to the currently made visible Fragment
var controller = NavHostFragment.FindNavController(f);
var appbarConfigBuilder =
new AppBarConfiguration
.Builder(_stackNavigationManager.NavGraph);
if (nativeToolbar != null && toolbar != null)
{
// TODO: MAUI Hackey way of wiring up Drawer Layout
// But currently you can only have a nav bar with a Navigation View
if (nativeToolbar.Parent is DrawerLayout dl1)
{
appbarConfigBuilder = appbarConfigBuilder.SetOpenableLayout(dl1);
}
else if (nativeToolbar.Parent?.Parent is DrawerLayout dl2)
{
appbarConfigBuilder = appbarConfigBuilder.SetOpenableLayout(dl2);
}
else if (nativeToolbar.Parent?.Parent?.Parent is DrawerLayout dl3)
{
appbarConfigBuilder = appbarConfigBuilder.SetOpenableLayout(dl3);
}
var appbarConfig =
appbarConfigBuilder.Build();
NavigationUI
.SetupWithNavController(nativeToolbar, controller, appbarConfig);
// the call to SetupWithNavController resets the Navigation Icon
toolbar.Handler?.UpdateValue(nameof(IToolbar.BackButtonVisible));
if (toolbar.BackButtonVisible && toolbar.IsVisible)
{
// Wiring up to this will break the Drawer Toggle button if it's visible
nativeToolbar.SetNavigationOnClickListener(_stackNavigationManager.BackClick);
}
}
}
void SetupToolbar()
{
if (_stackNavigationManager == null || _navController == null)
{
return;
}
var appbarConfigBuilder =
new AppBarConfiguration
.Builder(_stackNavigationManager.NavGraph);
if (_drawerLayout != null)
{
appbarConfigBuilder = appbarConfigBuilder.SetOpenableLayout(_drawerLayout);
}
var appbarConfig =
appbarConfigBuilder.Build();
NavigationUI
.SetupWithNavController(PlatformView, _navController, appbarConfig);
// the call to SetupWithNavController resets the Navigation Icon
UpdateValue(nameof(IToolbar.BackButtonVisible));
PlatformView.SetNavigationOnClickListener(BackNavigationClick);
}