private void WeightChanged(Object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName != "Value" || _changing != null)
{
return;
}
// here's where we adjust the other values if one changes.
var total = Weights.Sum(x => x.Value);
var makeup = 100 - total;
if (makeup == 0)
{
return;
}
var addToEach = makeup / (Weights.Count - 1);
if (addToEach == 0)
{
return;
}
_changing = (WeightValueViewModel)sender;
foreach (var wvm in Weights)
{
if (wvm == _changing)
{
continue;
}
wvm.Value += addToEach;
if (wvm.Value < 0)
{
wvm.Value = 0;
}
if (wvm.Value > 100)
{
wvm.Value = 99;
}
}
// handle rounding error, charge the one the user is modifying
total = Weights.Sum(x => x.Value);
if (total != 100)
{
_changing.Value += 100 - total;
}
_changing = null;
}
public WeightViewModel(IList <IIndicator> indicators)
{
if (indicators == null)
{
Weights = new List <WeightValueViewModel>();
return;
}
Weights = indicators.Select(x =>
{
var model = new WeightValueViewModel
{
Value = (Int32?)(x.Weight * 100),
Indicator = x
};
model.PropertyChanged += WeightChanged;
return(model);
}).ToList();
}