/// <summary>
///
/// </summary>
/// <param name="canExecute"></param>
/// <param name="executed"></param>
/// <param name="scheduler"></param>
/// <returns></returns>
public static ReactiveCommand Create(Func<object, bool> canExecute, Action<object> executed = null, IScheduler scheduler = null)
{
var ret = new ReactiveCommand(canExecute, scheduler);
if (executed != null) {
ret.Subscribe(executed);
}
return ret;
}
public void ObservableCanExecuteShouldShowUpInCommand()
{
var input = new[] {true, false, false, true, false, true};
var result = (new TestScheduler()).With(sched => {
var can_execute = new Subject<bool>();
var fixture = new ReactiveCommand(can_execute, null);
var changes_as_observable = new ListObservable<bool>(fixture.CanExecuteObservable);
int change_event_count = 0;
fixture.CanExecuteChanged += (o, e) => { change_event_count++; };
input.Run(x => {
can_execute.OnNext(x);
sched.Run();
Assert.AreEqual(x, fixture.CanExecute(null));
});
// N.B. We check against '5' instead of 6 because we're supposed to
// suppress changes that aren't actually changes i.e. false => false
can_execute.OnCompleted();
sched.Run();
Assert.AreEqual(5, change_event_count);
return changes_as_observable;
});
input.AssertAreEqual(result.ToList());
}
public void MultipleSubscribesShouldntResultInMultipleNotifications()
{
var input = new[] { 1, 2, 1, 2 };
var sched = new TestScheduler();
var fixture = new ReactiveCommand(null, sched);
var odd_list = new List<int>();
var even_list = new List<int>();
fixture.Where(x => ((int)x) % 2 != 0).Subscribe(x => odd_list.Add((int)x));
fixture.Where(x => ((int)x) % 2 == 0).Subscribe(x => even_list.Add((int)x));
input.Run(x => fixture.Execute(x));
sched.RunToMilliseconds(1000);
new[]{1,1}.AssertAreEqual(odd_list);
new[]{2,2}.AssertAreEqual(even_list);
}
public void CompletelyDefaultReactiveCommandShouldFire()
{
var sched = new TestScheduler();
var fixture = new ReactiveCommand(null, sched);
Assert.IsTrue(fixture.CanExecute(null));
string result = null;
fixture.Subscribe(x => result = x as string);
fixture.Execute("Test");
sched.Run();
Assert.AreEqual("Test", result);
fixture.Execute("Test2");
sched.Run();
Assert.AreEqual("Test2", result);
}
public void ObservableExecuteFuncShouldBeObservableAndAct()
{
var executed_params = new List<object>();
var fixture = new ReactiveCommand(x => executed_params.Add(x));
var observed_params = new ReplaySubject<object>();
fixture.Subscribe(observed_params.OnNext, observed_params.OnError, observed_params.OnCompleted);
var range = Enumerable.Range(0, 5);
range.Run(x => fixture.Execute(x));
range.Zip(executed_params, (expected, actual) => new { expected, actual })
.Run(x => Assert.AreEqual(x.expected, x.actual));
range.ToObservable()
.Zip(observed_params, (expected, actual) => new { expected, actual })
.Do(Console.WriteLine)
.Subscribe(x => Assert.AreEqual(x.expected, x.actual));
}
public void ObservableCanExecuteShouldShowUpInCommand()
{
var can_execute = new Subject<bool>();
var fixture = new ReactiveCommand(can_execute, null);
var changes_as_observable = new ListObservable<bool>(fixture.CanExecuteObservable);
var input = new[] { true, false, false, true, false, true };
int change_event_count = 0;
fixture.CanExecuteChanged += (o, e) => { change_event_count++; };
input.Run(x => {
can_execute.OnNext(x);
Assert.AreEqual(x, fixture.CanExecute(null));
});
// N.B. We check against '5' instead of 6 because we're supposed to
// suppress changes that aren't actually changes i.e. false => false
can_execute.OnCompleted();
Assert.AreEqual(5, change_event_count);
input.Zip(changes_as_observable.ToList(), (expected, actual) => new { expected, actual })
.Do(Console.WriteLine)
.Run(x => Assert.AreEqual(x.expected, x.actual));
}
public void ObservableCanExecuteFuncShouldShowUpInCommand()
{
int counter = 1;
var fixture = new ReactiveCommand(_ => (++counter % 2 == 0), null);
var changes_as_observable = new ListObservable<bool>(fixture.CanExecuteObservable);
int change_event_count = 0;
fixture.CanExecuteChanged += (o, e) => { change_event_count++; };
Enumerable.Range(0, 6).Run(x => {
Assert.AreEqual(x % 2 == 0, fixture.CanExecute(null));
});
Assert.AreEqual(6, change_event_count);
}
public void MultipleSubscribesShouldntResultInMultipleNotifications()
{
var input = new[] { 1, 2, 1, 2 };
var fixture = new ReactiveCommand(null, null);
var odd_list = new List<int>();
var even_list = new List<int>();
fixture.Where(x => ((int)x) % 2 != 0).Subscribe(x => odd_list.Add((int)x));
fixture.Where(x => ((int)x) % 2 == 0).Subscribe(x => even_list.Add((int)x));
input.Run(x => fixture.Execute(x));
new[]{1,1}.Zip(odd_list, (expected, actual) => new { expected, actual })
.Run(x => Assert.AreEqual(x.expected, x.actual));
new[]{2,2}.Zip(even_list, (expected, actual) => new { expected, actual })
.Run(x => Assert.AreEqual(x.expected, x.actual));
}
public void ActionExceptionShouldntPermabreakCommands()
{
var input = new[] {1,2,3,4};
var fixture = new ReactiveCommand(x => {
if (((int)x) == 2)
throw new Exception("Die!");
});
var exception_list = new List<Exception>();
var out_list = new List<int>();
fixture.Subscribe(x => out_list.Add((int)x), ex => exception_list.Add(ex));
bool we_threw = false;
foreach (int i in input) {
try {
fixture.Execute(i);
} catch {
we_threw = true;
if (i != 2)
throw;
}
}
Assert.IsTrue(we_threw);
input.Zip(out_list, (expected, actual) => new { expected, actual })
.Run(x => Assert.AreEqual(x.expected, x.actual));
// Now, make sure that the command isn't broken
fixture.Execute(5);
Console.WriteLine(String.Join(",", out_list));
Assert.AreEqual(5, out_list.Count);
}