public void BindCommandToObjectWithEventCommandIsArgumentNull()
{
var vm = new CommandBindingViewModel();
var view = new CommandBindingView {
ViewModel = vm
};
var invokeCount = 0;
vm.Command2.Subscribe(_ => invokeCount++);
var btn = new Button();
var cmd = (btn as ICommand) !;
var sub = new Subject <object>();
Assert.Throws <TargetInvocationException>(() =>
{
var disp = CreatesCommandBinding.BindCommandToObject(cmd, view, sub, "PropertyChanged");
view.Command2.RaiseEvent(new MouseButtonEventArgs(Mouse.PrimaryDevice, 0, MouseButton.Left)
{
RoutedEvent = UIElement.MouseUpEvent
});
disp.Dispose();
view.Command2.RaiseEvent(new MouseButtonEventArgs(Mouse.PrimaryDevice, 0, MouseButton.Left)
{
RoutedEvent = UIElement.MouseUpEvent
});
});
Assert.Equal(0, invokeCount);
}
public void BindCommandToObjectTargetIsNull()
{
var vm = new CommandBindingViewModel();
var view = new CommandBindingView {
ViewModel = vm
};
var invokeCount = 0;
vm.Command2.Subscribe(_ => invokeCount++);
var sub = new Subject <object>();
Assert.Throws <Exception>(() =>
{
var disp = CreatesCommandBinding.BindCommandToObject(vm.Command2, true, sub);
view.Command2.RaiseEvent(new MouseButtonEventArgs(Mouse.PrimaryDevice, 0, MouseButton.Left)
{
RoutedEvent = UIElement.MouseUpEvent
});
disp.Dispose();
view.Command2.RaiseEvent(new MouseButtonEventArgs(Mouse.PrimaryDevice, 0, MouseButton.Left)
{
RoutedEvent = UIElement.MouseUpEvent
});
});
Assert.Equal(0, invokeCount);
}
private static IDisposable BindCommandInternal <TView, TProp, TParam>(
IObservable <TProp> source,
TView view,
Expression controlExpression,
IObservable <TParam> withParameter,
string?toEvent)
where TView : class, IViewFor
where TProp : ICommand
{
var disposable = Disposable.Empty;
var bindInfo = source.CombineLatest(
view.SubscribeToExpressionChain <TView, object?>(controlExpression, false, false, RxApp.SuppressViewCommandBindingMessage).Select(x => x.GetValue()),
(val, host) => new { val, host });
var propSub = bindInfo
.Subscribe(x =>
{
if (x.host is null)
{
return;
}
disposable.Dispose();
if (x is null)
{
disposable = Disposable.Empty;
return;
}
disposable = !string.IsNullOrEmpty(toEvent) ?
CreatesCommandBinding.BindCommandToObject(x.val, x.host, withParameter.Select(y => (object)y !), toEvent) :
CreatesCommandBinding.BindCommandToObject(x.val, x.host, withParameter.Select(y => (object)y !));
});
return(Disposable.Create(() =>
{
propSub.Dispose();
disposable.Dispose();
}));
}
