/// <summary>
/// Returns an existing <see cref="INavigationView{TViewModel}"/> instance by <paramref name="viewModel"/> that can handle a lifecycle-aware view model result.
/// </summary>
/// <param name="viewModel">The view model that is used to get its view.</param>
/// <returns>The navigation view instance.</returns>
/// <exception cref="ArgumentNullException"><paramref name="viewModel"/> is <see langword="null"/>.</exception>
/// <exception cref="InvalidOperationException">The view instance is missing for the provided <paramref name="viewModel"/>.</exception>
public static INavigationView <ILifecycleViewModelWithResultHandler> Get(ILifecycleViewModelWithResultHandler viewModel)
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
return(ViewCache.Get <INavigationView <ILifecycleViewModelWithResultHandler>, ILifecycleViewModelWithResultHandler>(viewModel));
}
/// <summary>
/// Gets an existing <see cref="INavigationView{TViewModel}"/> instance by <paramref name="viewModel"/> that can handle a lifecycle-aware view model result.
/// </summary>
/// <param name="viewModel">The view model that is used to get its view.</param>
/// <param name="view">The navigation view corresponding to the provided model.</param>
/// <returns><see langword="true"/> if the view still exists and has not yet been garbage collected or disposed; otherwise, <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="viewModel"/> is <see langword="null"/>.</exception>
public static bool TryGetView(ILifecycleViewModelWithResultHandler viewModel, [MaybeNullWhen(returnValue: false)] out INavigationView <ILifecycleViewModelWithResultHandler> view)
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
return(ViewRegistry.TryGetView(viewModel, out view));
}
public void NavigateToLanguages(ILifecycleViewModelWithResultHandler from)
{
var view = NavigationViewProvider.Get(from);
var target = new LanguagesViewController();
NavigateForResult <LanguagesViewController, SelectedLanguageResult>(view, target, true);
/* Here's what is done by Navigate() above:
*
* target.ResultSetWeakSubscribe(view.HandleResult);
* view.GetNavigationController().PushViewController(target, true);
*
*/
}
public static INavigationView <ILifecycleViewModelWithResultHandler> Get(ILifecycleViewModelWithResultHandler viewModel)
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
if (!ViewRegistry.TryGetView <ILifecycleViewModelWithResultHandler, INavigationView <ILifecycleViewModelWithResultHandler> >(viewModel, out var view))
{
throw new InvalidOperationException(
$"The view instance is missing for the provided '{TypeFormatter.FormatName(viewModel.GetType())}' view model.");
}
return(view);
}
public void NavigateToLanguages(ILifecycleViewModelWithResultHandler from)
{
var view = NavigationViewProvider.Get(from);
NavigateForResult <LanguagesActivity, SelectedLanguageResult>(view);
/* Here's what is approximately done by Navigate() above:
*
* var source = view.GetActivity();
* var code = view.RequestCode.GetFor<DefaultResultMapper<SelectedLanguageResult>>();
* var intent = new Intent(source, typeof(LanguagesActivity));
* source.StartActivityForResult(intent, code);
*
*/
}
