public async Task Push(NavigationPushInfo pushInfo)
{
var newPage = GetInitializedPage(pushInfo);
INavigation navigation;
var masterDetailPage = _app.MainPage as MasterDetailPage;
if (masterDetailPage != null && masterDetailPage.IsPresented)
{
masterDetailPage.IsPresented = false;
await Task.Delay(300);
}
switch (pushInfo.Mode)
{
case NavigationMode.Normal:
if (_navigations.TryPeek(out navigation))
{
await navigation.PushAsync(newPage, pushInfo.WithAnimation);
}
break;
case NavigationMode.Modal:
if (_navigations.TryPeek(out navigation))
{
await navigation.PushModalAsync(newPage, pushInfo.WithAnimation);
if (newPage.Navigation != null && !_navigations.Contains(newPage.Navigation))
{
_navigations.Push(newPage.Navigation);
}
}
break;
case NavigationMode.Root:
if (masterDetailPage != null)
{
await SetRootDetailPage(masterDetailPage, newPage, pushInfo.WithAnimation);
}
else
{
_app.MainPage = newPage;
}
DisposePages(_navigations.ToArray());
_navigations.Clear();
_navigations.Push(newPage.Navigation);
break;
case NavigationMode.Custom:
await HandleCustomPushNavigation(masterDetailPage, pushInfo);
break;
default:
throw new NotImplementedException();
}
}
void NavigationPushCallback(MessageBus bus, NavigationPushInfo navigationPushInfo)
{
if (_isBusy)
{
return;
}
if (navigationPushInfo == null)
{
throw new ArgumentNullException(nameof(navigationPushInfo));
}
if (string.IsNullOrEmpty(navigationPushInfo.To))
{
throw new FieldAccessException(@"'To' page value should be set");
}
if (_app == null)
{
throw new FieldAccessException(@"App property not set. Use Init() before navigation");
}
if (_navigations.Count == 0)
{
throw new FieldAccessException(@"Navigation is null. Add NavigationPage first");
}
Device.BeginInvokeOnMainThread(async() => {
_isBusy = true;
try {
await Push(navigationPushInfo);
}
catch (Exception e) {
System.Diagnostics.Debug.WriteLine(e);
}
_isBusy = false;
});
}
Page GetInitializedPage(NavigationPushInfo navigationPushInfo)
{
return(GetInitializedPage(navigationPushInfo.To, navigationPushInfo.Mode, navigationPushInfo.NavigationParams,
navigationPushInfo.NewNavigationStack, navigationPushInfo.WithAnimation,
navigationPushInfo.WithBackButton, navigationPushInfo.ToTitle));
}
Task HandleCustomPushNavigation(MasterDetailPage masterDetailPage, NavigationPushInfo pushInfo)
{
// TODO: Implement your own navigation stack manipulation using pushInfo
return(Task.FromResult(0));
}