public SelectAreaPageViewModel(INavigationService navigationService,
ITerminalService terminalService,
IDialogService dialogService
) : base(navigationService, dialogService)
{
Title = "选择片区";
_terminalService = terminalService;
this.Load = ReactiveCommand.CreateFromTask(async() =>
{
var result = await _terminalService.GetDistrictsAsync(true, new System.Threading.CancellationToken());
if (result != null)
{
var series = result;
Districts = new ObservableCollection <DistrictModel>(series);
}
});
this.CancelCommand = ReactiveCommand.CreateFromTask(async() =>
{
await _navigationService.GoBackAsync();
});
this.CheckCommand = ReactiveCommand.CreateFromTask(async() =>
{
var item = Districts.Where(s => s.Selected).ToList().FirstOrDefault();
if (item == null)
{
this.Alert("请选择项目！");
return;
}
await _navigationService.GoBackAsync(("District", item));
});
this.DeleteCommand = ReactiveCommand.CreateFromTask(async() =>
{
var item = Districts.Where(s => s.Selected).ToList().FirstOrDefault();
await _navigationService.GoBackAsync(("ClearDistrict", item));
});
this.WhenAnyValue(x => x.Selecter).Throttle(TimeSpan.FromMilliseconds(500))
.Skip(1)
.Where(x => x != null)
.SubOnMainThread(item =>
{
item.Selected = !item.Selected;
this.Selecter = null;
}).DisposeWith(DeactivateWith);
this.BindBusyCommand(Load);
}
public async Task <IEnumerable <string> > SearchDistricts(string value)
{
var cancellationToken = new CancellationTokenSource().Token;
DistrictsDTO = await coWINMetadataService.
GetDistricts(StatesDTO.Where(x => x.StateName == State).FirstOrDefault().StateId.ToString(), cancellationToken);
Districts = DistrictsDTO.Select(x => x.DistrictName).ToList();
if (string.IsNullOrEmpty(value))
{
return(Districts);
}
return(Districts.Where(x => x.Contains(value, StringComparison.InvariantCultureIgnoreCase)));
}
private void BalanceDistrictCounts()
{
var redDistricts = Districts.Where((c) => { return(c.CurrentMajority == Constituent.Party.Red); });
var blueDistricts = Districts.Where((c) => { return(c.CurrentMajority == Constituent.Party.Blue); });
int redCount = redDistricts.Count();
int blueCount = blueDistricts.Count();
while (redCount != blueCount)
{
//find out which one we want to switch
District districtToFlip;
Constituent.Party originalParty, targetParty;
//how many votes we need to sway in the other party's favor
int amountToFlip;
if (redCount > blueCount)
{
originalParty = Constituent.Party.Red;
targetParty = Constituent.Party.Blue;
districtToFlip = Utils.ChooseRandom(redDistricts.ToList());
//enough votes to make it even, plus enough votes to give blue a small margin
amountToFlip = (districtToFlip.VotesRed - districtToFlip.VotesBlue) / 2 + Random.Range(1, 4);
}
else
{
originalParty = Constituent.Party.Blue;
targetParty = Constituent.Party.Red;
districtToFlip = Utils.ChooseRandom(blueDistricts.ToList());
//enough votes to make it even, plus enough votes to give red a small margin
amountToFlip = (districtToFlip.VotesBlue - districtToFlip.VotesRed) / 2 + Random.Range(1, 4);
}
//swap random consitutents in this district until it flips
int numFlipped = 0;
while (numFlipped < amountToFlip)
{
Constituent districtConstituent = districtToFlip.ConstituentsQuery.First((c) => c.party == originalParty);
//select a random district from ALL other districts, and choose a random constituent in the target party
District otherDistrict = Utils.ChooseRandom(Districts);
if (otherDistrict == districtToFlip)
{
continue;
}
Constituent otherConstituent = otherDistrict.ConstituentsQuery.FirstOrDefault((c) => c.party == targetParty);
if (otherConstituent == null)
{
continue;
}
//swap their parties
districtConstituent.party = targetParty;
otherConstituent.party = originalParty;
//update the other district's member data
otherDistrict.UpdateMemberData();
numFlipped++;
}
//update district member data
districtToFlip.UpdateMemberData();
//update the counts after the change
redCount = redDistricts.Count();
blueCount = blueDistricts.Count();
}
}