protected static async Task <bool> ShowModalViewModelAsync(BaseViewModel viewModel, BaseViewModel parentViewModel, bool mainViewModel = false)
{
if (string.IsNullOrWhiteSpace(viewModel.ViewModelGuid))
{
viewModel.ViewModelGuid = Guid.NewGuid().ToString();
}
var tcs = new TaskCompletionSource <bool>();
if (!mainViewModel)
{
ViewModelDataCollection.Push(viewModel.ViewModelGuid, TCS_VALUE, tcs);
}
bool result = false;
var presenter = Resolver.Resolve <IPresenterManager>();
if (presenter != null)
{
result = await presenter.TryDisplayViewAsync(viewModel, parentViewModel);
}
if (mainViewModel && result)
{
tcs.SetResult(true);
}
else if (!result) //Not awaiting because view is not display
{
tcs.SetResult(false);
}
return(await tcs.Task);
}
/// <summary>
/// Call when view linked to viewmodel closed
/// Here fo Unregister event message
/// </summary>
protected virtual void Closed(bool backPressed)
{
_viewModelClosed = true;
//It's for this view Model
var tcsShowingViewModel = ViewModelDataCollection.Get <TaskCompletionSource <bool> >(_viewModelGuid, TCS_VALUE);
if (tcsShowingViewModel != null)
{
tcsShowingViewModel.TrySetResult(!backPressed);
}
if (_autoClearViewModelDataCollection)
{
ViewModelDataCollection.Clear(_viewModelGuid);
}
AppMessenger.AppInstance.Unregister <MvxMessageViewModelEvent>(this);
}
