I want to use my Viewmodel instance in Adapter class but it doesn't find the viewModel delegate.It works in fragment and activities but not found in adapter classes.
private val queueViewModel: QueueViewModel by viewModels {
QueueViewModel.QueueDataViewModelFactory((requireActivity().application as DownloadManagerApplication).repository)
}
unresolved reference: viewModels
Related
I want to inject a specific list of implementation classes to my Service class in a specific order via guice. I cannot use #ProvidesIntoSet because that will inject all implementations of my interface and I don't want that. I want to inject only some implementations and they should be in order. So, in my Module, I have this
#Provides
#Named(value = "vehicles")
fun getVehicles(
car: Car,
bus: Bus,
): List<Vehicle> {
return listOf(
car,
bus
)
}
Now, when I try to inject this list in my Service class like
class VehicleService #Inject constructor(
#Named("vehicles") private val vehicles: List<Vehicle>,
...
I get an error like
No implementation for List<? extends Vehicle> annotated with #Named(value="vehicles") was bound
How can I fix this issue?
You are running into this issue (https://github.com/google/guice/issues/1282.) with implied wildcard types.
You need to add #JvmSuppressWildcards as described in https://github.com/google/guice/issues/1641.
I'm using DataTemplates in a ViewModel first approach.
I need to share a singleton ViewModel with multiple views.
So, I setup a simple ViewModel for each view and, using Ninject, I'm getting from the Kernel a reference to the singleton viewmodel...so I thought.
Structure:
MainViewModel
ObservableCollection TabViewModels {get; set;}
TabViewModels.Add(new View1ViewModel());
View1ViewModel
in constructor...getting reference to MainViewModel (singleton)
This causes a circular reference...the constructor in MainViewModel is executing each time around the circle.
I'm binding the viewmodel in Ninject this way...
Bind<GridViewModel>().ToSelf().InSingletonScope();
I'm getting the reference this way...
private MainViewModel _mvm;
public View1ViewModel()
{
_mvm = ViewModelLocator.MainViewModel;
//or
_mvm = ViewModelLocator.Kernel.Get<MainViewModel();
//both produce the same results
}
I'm trying out Unity and I'm having problems declaring my viewmodel in XAML. Can you help me out?
XAML:
<UserControl.DataContext>
<search:SearchBoxViewModel />
</UserControl.DataContext>
Constructor:
[ImportingConstructor]
public SearchBoxViewModel(IRegionManager regionManager, IEventAggregator eventAggregator)
{
this.regionManager = regionManager;
this.eventAggregator = eventAggregator;
}
When I try to execute I get a resolutionfailedexception.
This worked when the viewmodel had an empty constructor. It seems as if it's having problems with the constructor injection.
If I load the module like this:
var searchView = Container.Resolve<SearchBoxView>();
searchView.DataContext = Container.Resolve<SearchBoxViewModel>();
//RegionManager.RegisterViewWithRegion(RegionNames.SearchRegion, typeof(SearchBoxView));
RegionManager.Regions[RegionNames.SearchRegion].Add(searchView);
It works.
Is there any possibility to do this with xaml ( with I personally think is better )?
By the way: I'm creating an application with wpf that primarily communicates with a webservice. What should I rather user: unity or MEF and what are the big differences between the two?
Thanks,
Raphi
http://msdn.microsoft.com/en-us/library/ms753379.aspx:
Requirements for a Custom Class as a XAML Element
In order to be able to be instantiated as an object element, your
class must meet the following requirements:
Your custom class must be public and support a default
(parameterless)
public constructor. (See following section for notes regarding
structures.)
...
So, if you want to use dependencies, you should right something like:
var searchView = Container.Resolve<SearchBoxView>();
public class SearchBoxView: UserControl
{
[Dependency]
public SearchBoxViewModel ViewModel
{
get { return (SearchBoxViewModel)DataContext; }
set { DataContext = value; }
}
I am developing a Windows Phone 7 app and am using the MVVM pattern. I have a need to pass a parameter to the contructor of the ViewModel for a page. All my datacontexts and binding are done in XAML. Through my research I've seen that I need to do so using a dependency injector such as NInject.
Here's a little detail on whats going on:
I have a page with a ListPicker that lists various tasks. Each task has a unique TaskID. When an item is selected I need to open another page that will show the selected Tasks detail. My ViewModel and binding is all done and works if I use a static TaskID in the ViewModel but of course I need to use a variable.
I've setup NInject in the project and the various classes needed such as ViewModelLocator and my NInjectModule as shown here:
public class LighthouseNInjectModule : NinjectModule
{
public override void Load()
{
this.Bind<TaskViewModel>().ToSelf().WithConstructorArgument("TaskID", 2690);
}
}
Note that I have hardcoded a TaskID here and using this code this value properly gets injected into my constructor. Of course, this is hardcoded and I need to get the TaskID for the selected ListPicker item. I know how to get the selected ID from the ListPicker but how do I make NInject aware of it so when my class constructor is run it will have the correct value?
Here is the basic definition of my ViewModel class showing use of the Injector attribute.
public class TaskViewModel : INotifyPropertyChanged
{
[Inject]
public TaskViewModel(int TaskID)
{
//run function to get data using TaskID
}
}
WithConstructorArgument has another oveload that accepts a lazy evaluated Func<Context, object>.
I've started playing with Wicket and I've chosen Guice as dependency injection framework. Now I'm trying to learn how to write a unit test for a WebPage object.
I googled a bit and I've found this post but it mentioned AtUnit so I decided to give it a try.
My WebPage class looks like this
public class MyWebPage extends WebPage
{
#Inject MyService service;
public MyWebPage()
{
//here I build my components and use injected object.
service.get(id);
....
}
}
I created mock to replace any production MyServiceImpl with it and I guess that Guice in hand with AtUnit should inject it.
Now the problems are:
AtUnit expects that I mark target object with #Unit - that is all right as I can pass already created object to WicketTester
#Unit MyWebPage page = new MyWebPage();
wicketTester.startPage(page);
but usually I would call startPage with class name.
I think AtUnit expects as well that a target object is market with #Inject so AtUnit can create and manage it - but I get an org.apache.wicket.WicketRuntimeException: There is no application attached to current thread main. Can I instruct AtUnit to use application from wicketTester?
Because I don't use #Inject at MyWebPage (I think) all object that should be injected by Guice are null (in my example the service reference is null)
I really can't find anything about AtUnit inside Wicket environment. Am I doing something wrong, am I missing something?
I don't know AtUnit but I use wicket with guice and TestNG. I imagine that AtUnit should work the same way. The important point is the creation of the web application with the use of guice.
Here how I bind all this stuff together for my tests.
I have an abstract base class for all my tests:
public abstract class TesterWicket<T extends Component> {
#BeforeClass
public void buildMockedTester() {
System.out.println("TesterWww.buildMockedTester");
injector = Guice.createInjector(buildModules());
CoachWebApplicationFactory instance =
injector.getInstance(CoachWebApplicationFactory.class);
WebApplication application = instance.buildWebApplication();
tester = new WicketTester(application);
}
protected abstract List<Module> buildModules();
The initialization is done for every test class. The subclass defines the necessary modules for the test in the buildModules method.
In my IWebApplicationFactory I add the GuiceComponentInjector. That way, after all component instantiation, the fields annotated with #Inject are filled by Guice:
public class CoachWebApplicationFactory implements IWebApplicationFactory {
private static Logger LOG = LoggerFactory.getLogger(CoachWebApplicationFactory.class);
private final Injector injector;
#Inject
public CoachWebApplicationFactory(Injector injector) {
this.injector = injector;
}
public WebApplication createApplication(WicketFilter filter) {
WebApplication app = injector.getInstance(WebApplication.class);
Application.set(app);
app.addComponentInstantiationListener(new GuiceComponentInjector(app, injector));
return app;
}
}