/// <summary>
/// Creates a window in non-modal state. If a window with the specified viewModelType exists, the window is activated instead of being created.
/// </summary>
/// <typeparam name="TViewModel">The view model type.</typeparam>
/// <param name="uiVisualizerService">The uiVisualizerService</param>
/// <param name="dataContext">The data context.</param>
/// <param name="scope">The scope.</param>
/// <returns>
/// A task.
/// </returns>
public static async Task ShowOrActivateAsync <TViewModel>(this IUIVisualizerService uiVisualizerService, object dataContext = null, object scope = null)
where TViewModel : IViewModel
{
var dependencyResolver = uiVisualizerService.GetDependencyResolver();
var viewModelManager = dependencyResolver.Resolve <IViewModelManager>();
var viewModelFactory = dependencyResolver.Resolve <IViewModelFactory>();
var existingViewModel = viewModelManager.GetFirstOrDefaultInstance <TViewModel>();
if (existingViewModel != null)
{
await uiVisualizerService.ShowOrActivateAsync <TViewModel>(dataContext, scope);
}
else
{
var vm = viewModelFactory.CreateViewModel(typeof(TViewModel), dataContext, scope);
await uiVisualizerService.ShowAsync(vm);
}
}