/// <summary>
/// Entry point for executing a command asynchronously and managing the display during the operation.
/// </summary>
/// <param name="command">The ReactiveCommand to execute asynchronously.</param>
/// <param name="callbackAction">The action to perform when the command completes.</param>
/// <param name="workingMessage">The message to display while the command is executing.</param>
/// <param name="completedMessge">(Optional) The message to display when the command completes.</param>
private void ExecuteAsyncCommand <T>(ReactiveCommand <T> command, Action <T> callbackAction, string workingMessage, string completedMessge = null)
{
//Update the UI to indicate an operation is in progress.
Mouse.OverrideCursor = Cursors.Wait;
IsActionInProgress = true;
SelectedFeatureViewModel = new WaitViewModel(IsActionInProgress, workingMessage);
CurrentStatusText = workingMessage;
//Execute the async command with the specifed callback delegate.
CancellationToken token = new CancellationToken(false);
command.ExecuteAsync().Subscribe(callbackAction, ex => HandleException(ex), () => OnCommandCompleted(completedMessge), token);
}
void SetupRx()
{
var countAsBehavior = Observable.Concat(
Observable.Defer(() => Observable.Return(navigationStack.Count)),
NavigationStack.CountChanged);
NavigateBack = ReactiveCommand.CreateAsyncObservable(countAsBehavior.Select(x => x > 1), _ => {
NavigationStack.RemoveAt(NavigationStack.Count - 1);
return(Observable.Return(Unit.Default));
});
Navigate = new ReactiveCommand <INavigatableViewModel>(Observable.Return(true), x => {
var vm = x as INavigatableViewModel;
if (vm == null)
{
throw new Exception("Navigate must be called on an INavigatableViewModel");
}
NavigationStack.Add(vm);
return(Observable.Return <INavigatableViewModel>(vm));
});
NavigateToMainPage = new ReactiveCommand <INavigatableViewModel>(Observable.Return(true), x =>
{
var vm = x as INavigatableViewModel;
if (vm == null)
{
throw new Exception("Navigate must be called on an INavigatableViewModel");
}
NavigationStack.Clear();
return(Observable.Return(vm));
});
NavigateAndReset = new ReactiveCommand <INavigatableViewModel>(Observable.Return(true), x => {
NavigationStack.Clear();
return(Navigate.ExecuteAsync(x));
//return Observable.Return(x as INavigatableViewModel);
});
CurrentViewModel = Observable.Concat(
Observable.Defer(() => Observable.Return(NavigationStack.LastOrDefault())),
NavigationStack.Changed.Select(_ => NavigationStack.LastOrDefault()));
}
