public void Add(ScreenDefinition <TViewModel> from, ScreenDefinition <TViewModel> to)
{
if (to is null)
{
throw new ArgumentNullException(nameof(to), "Null value for destination is not allowed");
}
if (!_nodePerScreenIds.TryGetValue(to.Id, out var node))
{
node = new Node <TViewModel>(to, isEntryPoint: from is null);
_nodePerScreenIds.Add(node.Screen.Id, node);
}
if (from is null)
{
_entryPoints.Add(node);
return;
}
if (!_nodePerScreenIds.TryGetValue(from.Id, out Node <TViewModel> fromNode))
{
throw new InvalidOperationException("Source has not been added to graph before destination, this is not allowed");
}
fromNode.NextNodes.Add(node);
}
public async Task Show(ScreenDefinition <TViewModel> screen, string parameter = null, ViewModelCreator <TViewModel> viewModelCreator = null)
{
var screenInstance = new ScreenInstance <TViewModel>(screen, parameter, viewModelCreator);
var result = _navigationGraph.FindBestStack(_navigationStack, screenInstance).ToList();
System.Diagnostics.Debug.WriteLine($"Navigating to {screen.RelativeRoute}");
System.Diagnostics.Debug.WriteLine($"\tUse stack: {string.Join(", ", result.Select(x => x.ToString()))}");
await UpdateNavigationStack(result);
}
public void Register(ScreenDefinition <TViewModel> from, ScreenDefinition <TViewModel> screen)
{
_navigationGraph.Add(from, screen);
}
public void RegisterEntryPoint(ScreenDefinition <TViewModel> screen)
{
_navigationGraph.Add(null, screen);
}
protected bool Equals(ScreenDefinition <TViewModel> other)
{
return(Id.Equals(other.Id));
}
public ScreenInstance(ScreenDefinition <TViewModel> definition, string parameter, ViewModelCreator <TViewModel> viewModelCreator)
{
Definition = definition;
Parameter = parameter;
ViewModelCreator = viewModelCreator ?? definition.DefaultViewModelCreator;
}