public static IDisposable BindPropertyChanged <T>(this IOperationController controller, INotifyPropertyChanged owner, string propertyName, bool autoMerge = true)
{
var prevValue = FastReflection.GetProperty <T>(owner, propertyName);
var callFromOperation = false;
owner.PropertyChanged += PropertyChanged;
return(new Disposer(() => owner.PropertyChanged -= PropertyChanged));
// local function
void PropertyChanged(object sender, PropertyChangedEventArgs args)
{
if (callFromOperation)
{
return;
}
if (args.PropertyName == propertyName)
{
callFromOperation = true;
T newValue = FastReflection.GetProperty <T>(owner, propertyName);
var operation = owner
.GenerateAutoMergeOperation(propertyName, newValue, prevValue, $"{sender.GetHashCode()}.{propertyName}", Operation.DefaultMergeSpan);
if (autoMerge)
{
operation = operation.Merge(controller);
}
operation
.AddPreEvent(() => callFromOperation = true)
.AddPostEvent(() => callFromOperation = false);
prevValue = newValue;
controller.Push(operation);
callFromOperation = false;
}
}
}
