public SimpleGraphViewModel()
{
var observer = MementoObserver.Monitor(service);
UndoCommand = DelegateCommand.Create()
.OnCanExecute(o => service.CanUndo)
.OnExecute(o => service.Undo())
.AddMonitor(observer);
RedoCommand = DelegateCommand.Create()
.OnCanExecute(o => service.CanRedo)
.OnExecute(o => service.Redo())
.AddMonitor(observer);
var person = new Person()
{
FirstName = "Mauro",
LastName = "Servienti"
};
var entity = new PersonViewModel();
service.Attach(entity);
entity.Initialize(person, false);
Entity = entity;
}
/// <summary>
/// Attaches the specified list of entities to the change tracking service.
/// </summary>
/// <typeparam name="T">The type of the entity.</typeparam>
/// <param name="service">The service to attach the entity to.</param>
/// <param name="data">The source entity list.</param>
/// <returns>The attached entity list.</returns>
public static IEnumerable <T> Attach <T>(this IChangeTrackingService service, IEnumerable <T> data)
{
foreach (var element in data)
{
service.Attach(element);
}
return(data);
}
/// <summary>
/// Attaches the specified source entity to the change tracking service.
/// </summary>
/// <typeparam name="T">The type of the entity.</typeparam>
/// <param name="service">The service to attach the entity to.</param>
/// <param name="source">The source entity.</param>
/// <returns>The attached entity.</returns>
public static T Attach <T>(this IChangeTrackingService service, T source)
{
source.As <IMemento>(m =>
{
service.Attach(m);
}, () =>
{
throw new NotSupportedException("Only IMemento enties can be attached to an IChangeTrackingService.");
});
return(source);
}
protected override void OnMementoChanged(IChangeTrackingService newMemento, IChangeTrackingService oldMemento)
{
base.OnMementoChanged(newMemento, oldMemento);
if (oldMemento != null)
{
oldMemento.Detach(addressesDataSource);
}
if (newMemento != null)
{
newMemento.Attach(addressesDataSource);
}
}
public ComplexGraphViewModel()
{
var observer = MementoObserver.Monitor(service);
UndoCommand = DelegateCommand.Create()
.OnCanExecute(o => service.CanUndo)
.OnExecute(o => service.Undo())
.AddMonitor(observer);
RedoCommand = DelegateCommand.Create()
.OnCanExecute(o => service.CanRedo)
.OnExecute(o => service.Redo())
.AddMonitor(observer);
CreateNewAddressCommand = DelegateCommand.Create()
.OnExecute(o =>
{
var address = Entity.Addresses.AddNew();
SelectedAddress = address;
});
DeleteAddressCommand = DelegateCommand.Create()
.OnCanExecute(o => SelectedAddress != null)
.OnExecute(o =>
{
SelectedAddress.Delete();
SelectedAddress = Entity.Addresses.FirstOrDefault();
})
.AddMonitor
(
PropertyObserver.For(this)
.Observe(v => v.SelectedAddress)
);
var person = new Person()
{
FirstName = "Mauro",
LastName = "Servienti"
};
person.Addresses.Add(new Address(person)
{
City = "Treviglio",
Number = "11",
Street = "Where I live",
ZipCode = "20100"
});
person.Addresses.Add(new Address(person)
{
City = "Daolasa",
Number = "2",
Street = "Pierino",
ZipCode = "20100"
});
var entity = new PersonViewModel();
entity.Initialize(person, false);
service.Attach(entity);
Entity = entity;
}