public CalculatorViewModel()
{
ClearCommand = new Command(
execute: () =>
{
accumulatedNum = 0;
CurrentEntry = "0";
isNumDisplayed = false;
RefreshCanExecutes();
});
NumericCommand = new Command <string>(
execute: (string parameter) =>
{
if (isNumDisplayed || CurrentEntry == "0")
{
CurrentEntry = parameter;
}
else
{
CurrentEntry += parameter;
}
isNumDisplayed = false;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
if (parameter == "0" && operatorPressed == "/")
{
return(!isNumDisplayed);
}
return(isNumDisplayed || CurrentEntry.Length < 16);
});
DecimalPointCommand = new Command(
execute: () =>
{
if (isNumDisplayed)
{
CurrentEntry = "0.";
}
else
{
CurrentEntry += ".";
}
isNumDisplayed = false;
RefreshCanExecutes();
},
canExecute: () =>
{
return(isNumDisplayed || !CurrentEntry.Contains("."));
});
OperatorCommand = new Command <string>(
execute: (string parameter) =>
{
double value = Double.Parse(CurrentEntry);
accumulatedNum = value;
isNumDisplayed = true;
operatorPressed = parameter;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(!isNumDisplayed);
});
FactorialCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (value == 0)
{
CurrentEntry = "1";
}
else
{
double tmp = value;
for (int i = 1; i < value; i++)
{
tmp *= i;
}
CurrentEntry = tmp.ToString();
}
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
double checkValue = Double.Parse(CurrentEntry);
return(!isNumDisplayed && (checkValue % 1 == 0) && (checkValue >= 0));
});
SquareCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
double square = value * value;
CurrentEntry = square.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isNumDisplayed);
});
OneOverCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
double oneOver = 1 / value;
CurrentEntry = oneOver.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isNumDisplayed && (currentEntry != "0"));
});
RootCommand = new Command <string>(
execute: (string parameter) =>
{
double value = Double.Parse(CurrentEntry);
double root = Double.Parse(parameter);
double res = Math.Pow(value, 1.0 / root);
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
if (parameter == "2")
{
double tmp = Double.Parse(currentEntry);
return(!isNumDisplayed && tmp >= 0);
}
return(!isNumDisplayed);
});
lnCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
double res = Math.Log(value);
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
double tmp = Double.Parse(currentEntry);
return(!isNumDisplayed && tmp > 0);
});
LogCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
double res = Math.Log10(value);
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
double tmp = Double.Parse(currentEntry);
return(!isNumDisplayed && tmp > 0);
});
EtoXCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
double res = Math.Pow(Math.E, value);
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isNumDisplayed);
});
TrigCommand = new Command <string>(
execute: (string parameter) =>
{
double value = Double.Parse(CurrentEntry);
double res = 0;
if (parameter == "sin")
{
res = Math.Sin(value);
}
if (parameter == "cos")
{
res = Math.Cos(value);
}
if (parameter == "tan")
{
res = Math.Tan(value);
}
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(!isNumDisplayed);
});
RandCommand = new Command <string>(
execute: (string parameter) =>
{
double value = Double.Parse(CurrentEntry);
Random random = new Random();
double res = random.NextDouble();
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(!isNumDisplayed);
});
EqualsCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (operatorPressed == "+")
{
accumulatedNum += value;
}
if (operatorPressed == "-")
{
accumulatedNum -= value;
}
if (operatorPressed == "*")
{
accumulatedNum *= value;
}
if (operatorPressed == "/")
{
accumulatedNum /= value;
}
CurrentEntry = accumulatedNum.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isNumDisplayed);
});
PlusMinusCommand = new Command(
execute: () => {
double v = -Double.Parse(CurrentEntry);
CurrentEntry = v.ToString();
RefreshCanExecutes();
});
SecondCommand = new Command(
execute: () => {
CurrentState = "2^x";
RefreshCanExecutes();
});
XtoXCommand = new Command <Button>(
execute: (Button parameter) =>
{
double value = Double.Parse(CurrentEntry);
double res = 1;
if (parameter.Text == "2^x")
{
res = Math.Pow(2, value);
}
if (parameter.Text == "10^x")
{
res = Math.Pow(10, value);
}
CurrentEntry = res.ToString();
isNumDisplayed = false;
operatorPressed = "";
RefreshCanExecutes();
},
canExecute: (Button parameter) =>
{
return(!isNumDisplayed);
});
}
public AdderViewModel()
{
ClearCommand = new Command(
execute: () =>
{
HistoryString = "";
accumulatedSum = 0;
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
ClearEntryCommand = new Command(
execute: () =>
{
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
BackspaceCommand = new Command(
execute: () =>
{
CurrentEntry = CurrentEntry.Substring(0, CurrentEntry.Length - 1);
if (CurrentEntry.Length == 0)
{
CurrentEntry = "0";
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isSumDisplayed && (CurrentEntry.Length > 1 || CurrentEntry[0] != '0'));
});
NumericCommand = new Command <string>(
execute: (string parameter) =>
{
if (isSumDisplayed || CurrentEntry == "0")
{
CurrentEntry = parameter;
}
else
{
CurrentEntry += parameter;
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(isSumDisplayed || CurrentEntry.Length < 16);
});
DecimalPointCommand = new Command(
execute: () =>
{
if (isSumDisplayed)
{
CurrentEntry = "0.";
}
else
{
CurrentEntry += ".";
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: () =>
{
return(isSumDisplayed || !CurrentEntry.Contains("."));
});
AddCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " + ";
accumulatedSum += value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isSumDisplayed);
});
}
int op = -1; //1+,2-,3*,4/
public CalcViewModel()
{
ClearCommand = new Command(
execute: () =>
{
HistoryString = "";
accumulatedSum = 0;
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
ClearEntryCommand = new Command(
execute: () =>
{
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
BackspaceCommand = new Command(
execute: () =>
{
CurrentEntry = CurrentEntry.Substring(0, CurrentEntry.Length - 1);
if (CurrentEntry.Length == 0)
{
CurrentEntry = "0";
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isSumDisplayed && (CurrentEntry.Length > 1 || CurrentEntry[0] != '0'));
});
NumericCommand = new Command <string>(
execute: (string parameter) =>
{
if (isSumDisplayed || CurrentEntry == "0")
{
CurrentEntry = parameter;
}
else
{
CurrentEntry += parameter;
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(isSumDisplayed || CurrentEntry.Length < 16);
});
DecimalPointCommand = new Command(
execute: () =>
{
if (isSumDisplayed)
{
CurrentEntry = "0.";
}
else
{
CurrentEntry += ".";
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: () =>
{
return(isSumDisplayed || !CurrentEntry.Contains("."));
});
AddCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
accumulatedSum += value;
CurrentEntry = "0";
op = 1;
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
SubCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (accumulatedSum != 0)
{
accumulatedSum -= value;
}
else
{
accumulatedSum = value;
}
CurrentEntry = "0";
op = 2;
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
MulCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (accumulatedSum != 0)
{
accumulatedSum *= value;
}
else
{
accumulatedSum = value;
}
CurrentEntry = "0";
op = 3;
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
DivCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (accumulatedSum == 0)
{
accumulatedSum = value;
}
else
{
if (value == 0)
{
accumulatedSum = 0;
}
else
{
accumulatedSum /= value;
}
}
CurrentEntry = "0";
op = 4;
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
SumCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (op == 1)
{
accumulatedSum += value;
}
else if (op == 2)
{
accumulatedSum += (-value);
}
else if (op == 3)
{
accumulatedSum *= value;
}
else if (op == 4)
{
if (value == 0)
{
accumulatedSum = 0;
}
else
{
accumulatedSum /= value;
}
}
CurrentEntry = accumulatedSum.ToString();
accumulatedSum = 0;
op = -1;
isSumDisplayed = true;
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isSumDisplayed);
});
FactCommand = new Command(
execute: () =>
{
int N = Int32.Parse(CurrentEntry);
int fact = 1;
for (int i = 1; i <= N; i++)
{
fact *= i;
}
CurrentEntry = fact.ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(!CurrentEntry.Contains(".") && Double.Parse(CurrentEntry) >= 0);
});
PlusMinusCommand = new Command(
execute: () =>
{
double v = -Double.Parse(CurrentEntry);
CurrentEntry = v.ToString();
RefreshCanExecutes();
});
SqrCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (value * value).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
OneOverCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (1 / value).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) != 0);
});
SqrtCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (Math.Sqrt(value)).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) >= 0);
});
cubertCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (Math.Pow(value, (double)1 / 3)).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) >= 0);
});
lnCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = Math.Log(value).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) != 0);
});
log10Command = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = Math.Log10(value).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) != 0);
});
exCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = Math.Exp(value).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
sinCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (Math.Sin(value)).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
cosCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (Math.Cos(value)).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
tanCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
CurrentEntry = (Math.Tan(value)).ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(true);
});
randCommand = new Command(
execute: () =>
{
Random rand = new System.Random();
CurrentEntry = rand.NextDouble().ToString();
RefreshCanExecutes();
},
canExecute: () =>
{
return(Double.Parse(CurrentEntry) == 0);
});
secondCommand = new Command(
execute: () =>
{
if (Second == "10ˣ")
{
Second = "2ˣ";
SecondLabel = "#212121";
}
else
{
Second = "10ˣ";
SecondLabel = "#FF0000";
}
});
tenxCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (Second == "10ˣ")
{
CurrentEntry = (Math.Pow(10, value)).ToString();
}
else
{
CurrentEntry = (Math.Pow(2, value)).ToString();
}
});
}
public CalcViewModel()
{
displayLabel = new Label {
Text = ""
};
ClearCommand = new Command(
execute: () =>
{
CurrentEntry = "";
count = 0;
negativevalueassigned = 0;
RefreshCanExecutes();
});
EqualsCommand = new Command(
execute: () =>
{
if (negativevalueassigned > 2)
{
CurrentEntry = "not valid";
}
else
{
compute(count);
}
RefreshCanExecutes();
});
BackspaceCommand = new Command(
execute: () =>
{
CurrentEntry = CurrentEntry.Substring(0, CurrentEntry.Length - 1);
if (CurrentEntry.Length == 0)
{
CurrentEntry = "0";
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(isAnswerDisplayed && (CurrentEntry.Length > 1 || CurrentEntry[0] != '0'));
});
NumericCommand = new Command <string>(
execute: (string parameter) =>
{
if (isAnswerDisplayed || CurrentEntry == "0")
{
CurrentEntry = parameter;
}
else
{
CurrentEntry += parameter;
}
isAnswerDisplayed = false;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(isAnswerDisplayed || CurrentEntry.Length < 16);
});
DecimalPointCommand = new Command(
execute: () =>
{
if (isAnswerDisplayed)
{
CurrentEntry = "0.";
}
else
{
CurrentEntry += ".";
}
isAnswerDisplayed = false;
RefreshCanExecutes();
},
canExecute: () =>
{
return(isAnswerDisplayed || !CurrentEntry.Contains("."));
});
AddCommand = new Command(
execute: () =>
{
if (negativevalueassigned > 1)
{
CurrentEntry = "not valid";
}
else if (CurrentEntry != "")
{
num1 = float.Parse(CurrentEntry);
CurrentEntry = "";
count = 2;
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
SubtractCommand = new Command(
execute: () =>
{
if (negativevalueassigned > 1)
{
CurrentEntry = "not valid";
}
else if (CurrentEntry != "")
{
num1 = float.Parse(CurrentEntry);
CurrentEntry = "";
count = 1;
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
DivideCommand = new Command(
execute: () =>
{
if (negativevalueassigned > 1)
{
CurrentEntry = "not valid";
}
else if (CurrentEntry != "")
{
num1 = float.Parse(CurrentEntry);
CurrentEntry = "";
count = 4;
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
MultiplyCommand = new Command(
execute: () =>
{
if (negativevalueassigned > 1)
{
CurrentEntry = "not valid";
}
else if (CurrentEntry != "")
{
num1 = float.Parse(CurrentEntry);
CurrentEntry = "";
count = 3;
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
ZeroCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 0;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
OneCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 1;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
TwoCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 2;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
ThreeCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 3;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
FourCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 4;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
FiveCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 5;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
SixCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 6;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
SevenCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 7;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
EightCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 8;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
NineCommand = new Command(
execute: () =>
{
CurrentEntry = currentEntry + 9;
},
canExecute: () =>
{
return(!isAnswerDisplayed);
});
}
public AdderViewModel()
{
ClearCommand = new Command(
execute: () =>
{
HistoryString = "";
accumulatedSum = 0;
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
ClearEntryCommand = new Command(
execute: () =>
{
CurrentEntry = "0";
isSumDisplayed = false;
RefreshCanExecutes();
});
BackspaceCommand = new Command(
execute: () =>
{
CurrentEntry = CurrentEntry.Substring(0, CurrentEntry.Length - 1);
if (CurrentEntry.Length == 0)
{
CurrentEntry = "0";
}
RefreshCanExecutes();
},
canExecute: () =>
{
return(!isSumDisplayed && (CurrentEntry.Length > 1 || CurrentEntry[0] != '0'));
});
NumericCommand = new Command <string>(
execute: (string parameter) =>
{
if (isSumDisplayed || CurrentEntry == "0")
{
CurrentEntry = parameter;
}
else
{
CurrentEntry += parameter;
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: (string parameter) =>
{
return(isSumDisplayed || CurrentEntry.Length < 16);
});
DecimalPointCommand = new Command(
execute: () =>
{
if (isSumDisplayed)
{
CurrentEntry = "0.";
}
else
{
CurrentEntry += ".";
}
isSumDisplayed = false;
RefreshCanExecutes();
},
canExecute: () =>
{
return(isSumDisplayed || !CurrentEntry.Contains("."));
});
AddAndExecuteCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (lastCommand == "")
{
CurrentEntry = value.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
else
{
switch (lastCommand)
{
case "+":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " + ";
accumulatedSum += value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "-":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " + ";
accumulatedSum -= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "*":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " + ";
accumulatedSum *= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "/":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " + ";
accumulatedSum /= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
default: break;
}
}
lastCommand = "+";
},
canExecute: () =>
{
return(!isSumDisplayed);
});
SubAndExecuteCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (lastCommand == "")
{
CurrentEntry = value.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
else
{
switch (lastCommand)
{
case "+":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " - ";
accumulatedSum += value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "-":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " - ";
accumulatedSum -= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "*":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " - ";
accumulatedSum *= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "/":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " - ";
accumulatedSum /= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
default: break;
}
}
lastCommand = "-";
},
canExecute: () =>
{
return(!isSumDisplayed);
});
MultiAndExecuteCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (lastCommand == "")
{
CurrentEntry = value.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
else
{
switch (lastCommand)
{
case "+":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " * ";
accumulatedSum += value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "-":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " * ";
accumulatedSum -= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "*":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " * ";
accumulatedSum *= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "/":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " * ";
accumulatedSum /= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
default: break;
}
}
lastCommand = "*";
},
canExecute: () =>
{
return(!isSumDisplayed);
});
DivideAndExecuteCommand = new Command(
execute: () =>
{
double value = Double.Parse(CurrentEntry);
if (lastCommand == "")
{
CurrentEntry = value.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
else
{
switch (lastCommand)
{
case "+":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " / ";
accumulatedSum += value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "-":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " / ";
accumulatedSum -= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "*":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " / ";
accumulatedSum *= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
case "/":
{
value = Double.Parse(CurrentEntry);
HistoryString += value.ToString() + " / ";
accumulatedSum /= value;
CurrentEntry = accumulatedSum.ToString();
isSumDisplayed = true;
RefreshCanExecutes();
}
break;
default: break;
}
}
lastCommand = "/";
},
canExecute: () =>
{
return(!isSumDisplayed);
});
}