public BudgetCalculatorEquation CreateCopy()
{
var copy = new BudgetCalculatorEquation
{
Id = this.Id,
Name = this.Name,
IsVisible = this.IsVisible,
Position = this.Position,
};
Items.ForEach(x => copy.Items.Add(x.CreateCopy()));
return(copy);
}
private BudgetEquationWizardVM()
{
_currentPageIndex = 0;
_equation = new BudgetCalculatorEquation();
InnerEquationList = new List<BudgetCalculatorItem>();
}
public void Clear(BudgetCalculatorEquation equation = null)
{
_currentPageIndex = 0;
InnerEquationList.Clear();
if (equation == null)
{
_equation = new BudgetCalculatorEquation();
}
else
{
_equation = equation;
InnerEquationList.AddRange(equation.Items);
}
RefreshCalculations();
CurrentItem = Items.FirstOrDefault();
Refresh();
}
public void AttachEvaluator(BudgetCalculatorEquation equation)
{
equation.Evaluator = () => Calculate(equation);
equation.Items.ForEach(x => AttachEvaluator(x));
}
public void UpdateForeignDescriptions(BudgetCalculatorEquation equation)
{
foreach (var item in equation.Items)
{
switch (item.ValueType)
{
case CalculatorValueType.CalculatorEquationValue:
var eq = CachedService.GetAllEquations().FirstOrDefault(x => x.Id == item.ForeignId);
if (eq != null)
{
item.ForeignDescription = eq.Name;
}
break;
case CalculatorValueType.BudgetExpensesValueOfType:
var cf = CachedService.GetAllCashFlows().FirstOrDefault(x => x.Id == item.ForeignId);
if (cf != null)
{
item.ForeignDescription = cf.Name;
}
break;
}
}
}
public void Refresh(BudgetCalculatorEquation equation)
{
AttachEvaluator(equation);
UpdateForeignDescriptions(equation);
}
public decimal? Calculate(BudgetCalculatorEquation equation)
{
StringBuilder expressionBuilder = new StringBuilder();
foreach (var item in equation.Items)
{
switch (item.ValueType)
{
case CalculatorValueType.UserValue:
expressionBuilder.Append(item.Value.GetValueOrDefault(0));
break;
case CalculatorValueType.Operator:
expressionBuilder.AppendFormat(" {0} ", item.OperatorType.ToMath());
break;
default:
if (item.Evaluator == null)
{
AttachEvaluator(item);
}
var value = item.CalculateValue();
if (value.HasValue)
{
expressionBuilder.Append(value.Value);
}
break;
}
}
var expression = expressionBuilder.ToString().Replace(",", ".");
try
{
var result = _calculator.Evaluate(expression);
return result;
}
catch (SyntaxException)
{
return null;
}
}
public BudgetCalculatorEquation CreateCopy()
{
var copy = new BudgetCalculatorEquation
{
Id = this.Id,
Name = this.Name,
IsVisible = this.IsVisible,
Position = this.Position,
};
Items.ForEach(x => copy.Items.Add(x.CreateCopy()));
return copy;
}
