code snippets for "MVP In Silverlight/WPF: Implementing The Overview UserControl" post, part II

s1.cs

public interface IUserGroupsView : IView
{
}

s2.cs

public override void Initialize()
{
    var requestDispatcher = RequestDispatcherFactory.CreateAsyncRequestDispatcher();
    requestDispatcher.Add(new CheckPermissionsRequest { PermissionsToCheck = new[] { Permissions.CreateUserGroup } });
    requestDispatcher.Add(new GetAllUserGroupsRequest());
    requestDispatcher.ProcessRequests(ResponsesReceived, PublishRemoteException);
}

s3.cs

private void ResponsesReceived(ReceivedResponses receivedResponses)
{
    if (receivedResponses.HasResponse<GetAllUserGroupsResponse>())
    {
        BindingModel.PopulateFrom(receivedResponses.Get<GetAllUserGroupsResponse>().UserGroups);
        View.ExpandTreeView();
    }
 
    if (receivedResponses.HasResponse<CheckPermissionsResponse>() &&
        !receivedResponses.Get<CheckPermissionsResponse>().AuthorizationResults[Permissions.CreateUserGroup])
    {
        View.HideAddNewButton();
    }
}

s4.cs

public interface IUserGroupsView : IView
{
    void ExpandTreeView();
    void HideAddNewButton();
}

s5.cs

public void DealWithSelectedUserGroup(HierarchicalUserGroupBindingModel selectedUserGroup)
{
    EventAggregator.Publish(new UserGroupSelectedEvent(selectedUserGroup.Id));
}
 
public void PrepareUserGroupCreation()
{
    EventAggregator.Publish(new UserGroupNeedsToBeCreatedEvent());
}

s6.cs

public class UserGroupChangedEvent : Event
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public Guid? ParentId { get; set; }
    public bool IsNew { get; set; }
}
 
public class UserGroupDeletedEvent : Event
{
    public UserGroupDeletedEvent(Guid userGroupId)
    {
        UserGroupId = userGroupId;
    }
 
    public Guid UserGroupId { get; private set; }
}

s7.cs

public class UserGroupsPresenter : Presenter<IUserGroupsView, UserGroupsBindingModel>,
    IListenTo<UserGroupChangedEvent>, IListenTo<UserGroupDeletedEvent>

s8.cs

EventAggregator.Subscribe(this);

s9.cs

public void Handle(UserGroupChangedEvent receivedEvent)
{
    if (receivedEvent.IsNew)
    {
        View.SelectItemInTreeView(BindingModel.AddUserGroup(receivedEvent.Id, receivedEvent.Name, receivedEvent.ParentId));
    }
    else
    {
        BindingModel.UpdateUserGroup(receivedEvent.Id, receivedEvent.Name, receivedEvent.ParentId);
    }
}
 
public void Handle(UserGroupDeletedEvent receivedEvent)
{
    BindingModel.RemoveUserGroup(receivedEvent.UserGroupId);
}