private IDisposable BindCommandInternal <TView, TProp, TParam>(
IObservable <TProp> @this,
TView view,
Expression controlExpression,
IObservable <TParam> withParameter,
string toEvent,
Func <ICommand, ICommand> commandFixuper = null)
where TView : class, IViewFor
where TProp : ICommand
{
IDisposable disp = Disposable.Empty;
var bindInfo = Observable.CombineLatest(
@this,
view.SubscribeToExpressionChain <TView, object>(controlExpression, false, false, RxApp.SuppressViewCommandBindingMessage).Select(x => x.Value),
(val, host) => new { val, host });
var propSub = bindInfo
.Where(x => x.host != null)
.Subscribe(x =>
{
disp.Dispose();
if (x == null)
{
disp = Disposable.Empty;
return;
}
var cmd = commandFixuper != null ? commandFixuper(x.val) : x.val;
if (toEvent != null)
{
disp = CreatesCommandBinding.BindCommandToObject(cmd, x.host, withParameter.Select(y => (object)y), toEvent);
}
else
{
disp = CreatesCommandBinding.BindCommandToObject(cmd, x.host, withParameter.Select(y => (object)y));
}
});
return(Disposable.Create(() =>
{
propSub.Dispose();
disp.Dispose();
}));
}
