private async Task PushInternalAsync(string screen, INavigationParameters parameters, AnimationOptions animationOptions, bool addToHistory = true)
{
if (m_IsBusy)
{
return;
}
if (string.IsNullOrEmpty(screen))
{
throw new ArgumentNullException(nameof(screen));
}
IScreenController nextScreen = null;
if (!m_ScreenRegistry.TryGetScreen(screen, out nextScreen))
{
throw new ArgumentNullException(nameof(screen), $"Screen with id {screen} does not exist!");
}
if (m_Current != null && !m_Current.CanNavigate(parameters))
{
return;
}
if (m_Current != null && addToHistory)
{
m_NavigationStack.Push(m_Current);
}
try
{
m_IsBusy = true;
if (!animationOptions.enabled)
{
if (m_Current != null)
{
m_Current.OnNavigatingAway(parameters);
await m_Current.UpdateDisplayAsync(NavigationMode.Leaving, false);
if (!addToHistory)
{
m_Current.OnScreenDestroyed(s_DefaultParams);
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
m_Current.UpdateDisplayAsync(NavigationMode.Removed, false);
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
}
}
m_Current = nextScreen;
m_Current.Prepare();
m_Current.OnNavigatingTo(parameters);
await m_Current.UpdateDisplayAsync(NavigationMode.Entering, false);
m_Current.OnNavigatedTo(parameters);
}
else
{
if (animationOptions.playSynchronously)
{
m_ParallelTasks.Clear();
if (m_Current != null)
{
m_Current.OnNavigatingAway(parameters);
m_ParallelTasks.Add(m_Current.UpdateDisplayAsync(NavigationMode.Leaving));
}
nextScreen.Prepare();
nextScreen.OnNavigatingTo(parameters);
m_ParallelTasks.Add(nextScreen.UpdateDisplayAsync(NavigationMode.Entering));
await Task.WhenAll(m_ParallelTasks);
if (m_Current != null && !addToHistory)
{
m_Current.OnScreenDestroyed(s_DefaultParams);
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
m_Current.UpdateDisplayAsync(NavigationMode.Removed, false);
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
}
m_Current = nextScreen;
m_Current.OnNavigatedTo(parameters);
}
else
{
if (m_Current != null)
{
m_Current.OnNavigatingAway(parameters);
await m_Current.UpdateDisplayAsync(NavigationMode.Leaving);
if (!addToHistory)
{
m_Current.OnScreenDestroyed(s_DefaultParams);
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
m_Current.UpdateDisplayAsync(NavigationMode.Removed, false);
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
}
}
m_Current = nextScreen;
m_Current.Prepare();
m_Current.OnNavigatingTo(parameters);
await m_Current.UpdateDisplayAsync(NavigationMode.Entering);
m_Current.OnNavigatedTo(parameters);
}
}
m_EventManager.Invoke(new NavigationCompletedEvent(m_Current.id, m_NavigationStack));
}
catch (Exception e)
{
Debug.LogException(e);
}
finally
{
m_IsBusy = false;
}
}