private bool CanClose <TViewModel>(TViewModel viewModel, [NotNullWhen(true)] out IStackAlgorithm stackAlgorithm)
where TViewModel : ViewModelBase
{
var mainParent = GetMainParentFor(viewModel);
if (TryGetStackAlgorithmFor(mainParent, out stackAlgorithm, out var stack, out var index))
{
return(stack.Count - 1 == index);
}
return(false);
}
private bool TryGetStackAlgorithmFor <TViewModel>(TViewModel viewModel, [NotNullWhen(true)] out IStackAlgorithm stackAlgorithm, out IReadOnlyList <ViewModelBase> stack, out int index)
where TViewModel : ViewModelBase
{
foreach (var(_, value) in _stackAlgorithms)
{
if (value.TryGetFromStack(viewModel, out stack, out index))
{
stackAlgorithm = value;
return(true);
}
}
stackAlgorithm = null;
stack = new List <ViewModelBase>();
index = -1;
return(false);
}
private async Task ClosePrivateAsync <TResult>(
IStackAlgorithm stackAlgorithm,
Action <TResult, CancelEventArgs> viewClosing,
Action <TResult> viewClosed,
TResult result,
bool withAnimation = true)
{
await ExecuteInNavigateSafelyAsync(async() =>
{
var args = new CancelEventArgs();
viewClosing?.Invoke(result, args);
if (args.Cancel)
{
return;
}
await stackAlgorithm.CloseAsync(withAnimation);
viewClosed?.Invoke(result);
});
}
