public MainWindowViewModel(IOccupationParser occupationParser)
{
this._occupationParser = occupationParser;
var occupationTypesSourceList = new SourceList <OccupationType>();
var occupationsSourceList = new SourceList <Occupation>();
var occupationTypes = occupationTypesSourceList.Connect().Transform(x => new CheckedItemViewModel(x.GetDescription(), true)).Publish();
var occupations = occupationsSourceList.Connect().Transform(x => new OccupationViewModel(x)).Publish();
IObservable <Func <OccupationViewModel, bool> > filter = occupationTypes.AutoRefresh(x => x.IsChecked).Filter(x => x.IsChecked).Transform(x => x.Name)
.ToCollection()
.Throttle(TimeSpan.FromMilliseconds(250))
.Select(items =>
{
var types = items.Select(t => t.GetValueFromDescription <OccupationType>());
OccupationType?type = null;
foreach (var item in types)
{
if (type == null)
{
type = item;
}
else
{
type |= item;
}
}
bool Predicate(OccupationViewModel vm) => type.HasValue && type.Value.HasFlag(vm.OccupationType);
return((Func <OccupationViewModel, bool>)Predicate);
});
occupationTypes.AutoRefresh(x => x.IsChecked).Filter(x => x.IsChecked).Throttle(TimeSpan.FromMilliseconds(350)).ObserveOn(RxApp.MainThreadScheduler).Subscribe(x =>
{
for (int i = 0; i < Occupations.Count; i++)
{
Occupations[i].SerialNumber = i + 1;
}
});
occupationTypes.ObserveOn(RxApp.MainThreadScheduler).Bind(out this._occupationTypes).Subscribe();
occupations.Filter(filter).ObserveOn(RxApp.MainThreadScheduler).Bind(out this._occupations).Subscribe();
occupationTypes.Connect();
occupations.Connect();
Initialize = ReactiveCommand.CreateFromTask(async() =>
{
var result = await this._occupationParser.ParseDataAsync("Occupations.txt");
occupationsSourceList.AddRange(result);
occupationTypesSourceList.AddRange(Enum.GetValues(typeof(OccupationType)).Cast <OccupationType>());
});
GetItemWithSerialNumber = ReactiveCommand.Create <int>(number =>
{
SelectedItem = Occupations.SingleOrDefault(x => x.SerialNumber == number);
});
Random = ReactiveCommand.CreateFromTask(async() =>
{
var random = new Random();
var number = random.Next(1, Occupations.Count);
await GetItemWithSerialNumber.Execute(number);
});
}
