IDisposable bindCommandInternal <TView, TViewModel, TProp, TParam>(
TViewModel viewModel,
TView view,
Expression <Func <TViewModel, TProp> > propertyName,
Func <object, object> viewPropGetter,
IObservable <TParam> withParameter,
string toEvent,
out IObservable <TProp> changed,
Func <ICommand, ICommand> commandFixuper = null)
where TViewModel : class
where TView : class, IViewFor <TViewModel>
where TProp : ICommand
{
var vmPropChain = Reflection.ExpressionToPropertyNames(propertyName);
IDisposable disp = Disposable.Empty;
changed = Reflection.ViewModelWhenAnyValue(viewModel, view, propertyName).Publish().RefCount();
var propSub = changed.Subscribe(x => {
disp.Dispose();
if (x == null)
{
disp = Disposable.Empty;
return;
}
var vmString = String.Join(".", vmPropChain);
var target = viewPropGetter(view);
if (target == null)
{
this.Log().Error("Binding {0}.{1} => {2}.{1} failed because target is null",
typeof(TViewModel).FullName, vmString, view.GetType().FullName);
disp = Disposable.Empty;
}
var cmd = commandFixuper != null ? commandFixuper(x) : x;
if (toEvent != null)
{
disp = CreatesCommandBinding.BindCommandToObject(cmd, target, withParameter.Select(y => (object)y), toEvent);
}
else
{
disp = CreatesCommandBinding.BindCommandToObject(cmd, target, withParameter.Select(y => (object)y));
}
});
return(Disposable.Create(() => {
propSub.Dispose();
disp.Dispose();
}));
}
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();
}));
}
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();
}));
}