private void CalcButton_Click(object sender, RoutedEventArgs e)
{
can = false;
CalcButton a = (CalcButton)e.Source;
if (a.Type == "number" || a.Type == "passive")
{
test += a.ActionValue;
}
if (a.Type == "active")
{
if (a.ActionValue == "del")
{
if (test.Length >= 1)
{
test = test.Remove(test.Length - 1);
}
//try
//{
// test = test.Remove(test.Length - 1);
//}
//catch
//{
//}
}
if (a.ActionValue == "C")
{
test = "";
}
if (a.ActionValue == "=")
{
test = sc.Eval(test).ToString();
can = true;
}
}
this.Screen.Text = test;
}
bool newCalcStarted; // has the user started a new calculation?
public MainForm()
{
InitializeComponent();
// .select keys from Enum.Keys that will be added to the calculator
// this is to allow the calculator to be operated from the NumPad
foreach (Keys k in Enum.GetValues(typeof(Keys)))
{
// Console.WriteLine(k.ToString());
if (k.ToString().Contains("NumPad") ||
arOps.Values.Select(t => t.Method.Name).Contains(k.ToString()) ||
k.ToString() == "Decimal" ||
k.ToString() == "Return" ||
k.ToString() == "Back" ||
k.ToString() == "Delete")
{
keyDict[k.ToString()] = k;
}
}
newCalcStarted = true;
previousValue = 0;
List <CalcButton> calcBtns = new List <CalcButton>();
// create rounded corners of the calculator window
Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
// populate the numeric key panel with buttons
int counter = 1;
for (int row = 0; row < tlpNumericKeys.RowCount; row++)
{
for (int column = 0; column < tlpNumericKeys.ColumnCount; column++)
{
string keyVal = (counter % 10).ToString();
string keyName = "NumPad" + keyVal;
Keys btnKey = keyDict[keyName];
CalcButton btn = new CalcButton(btnKey);
keysToButtons[btnKey] = btn;
tlpNumericKeys.Controls.Add(btn, column, row);
btn.Text = keyVal;
calcBtns.Add(btn);
counter++;
if (counter > 10)
{
break;
}
}
}
// add callback functions to numeric keys
foreach (CalcButton c in calcBtns)
{
c.Click += (s, e) =>
{
if (newCalcStarted)
{
lbCalcHistory.Text = "";
tbOutput.Text = c.Text;
newCalcStarted = false;
}
else
{
if (tbOutput.Text == "0")
{
tbOutput.Text = c.Text;
}
else
{
tempString = tbOutput.Text + c.Text;
if (Double.TryParse(tempString, out currentValue))
{
//tbOutput.Text = currentValue.ToString();
tbOutput.Text = tempString;
}
}
}
};
}
// add decimal point button and create callback
CalcButton dotBtn = new CalcButton(keyDict["Decimal"]);
keysToButtons[keyDict["Decimal"]] = dotBtn;
tlpNumericKeys.Controls.Add(dotBtn, 1, 3);
dotBtn.Text = ".";
//calcBtns.Add(dotBtn);
dotBtn.Click += (s, e) =>
{
if (newCalcStarted)
{
tbOutput.Text = "0.";
lbCalcHistory.Text = "";
newCalcStarted = false;
}
else if (!tbOutput.Text.Contains("."))
{
tbOutput.Text += ".";
}
};
// add backspace button and create callback
CalcButton erase = new CalcButton(keyDict["Back"]);
keysToButtons[keyDict["Back"]] = erase;
tlpNumericKeys.Controls.Add(erase, 2, 3);
erase.Text = "\u2190";
//calcBtns.Add(dotBtn);
erase.Click += (s, e) =>
{
if (Double.TryParse(tbOutput.Text, out currentValue) &&
(Double.IsInfinity(currentValue) || Double.IsNaN(currentValue)))
{
lbCalcHistory.Text = "";
tbOutput.Text = "0";
}
else
{
if (tbOutput.Text.Length == 1)
{
tbOutput.Text = "0";
}
else
{
tbOutput.Text = tbOutput.Text.Substring(0, tbOutput.Text.Length - 1);
if (newCalcStarted)
{
lbCalcHistory.Text = "";
newCalcStarted = false;
}
}
}
};
AddArithmeticFunctions();
AddAdvancedFunctions();
// add event handler to each button to handle key presses
foreach (Control c in this.Controls)
{
c.KeyDown += new KeyEventHandler(keypressed);
foreach (Control cc in c.Controls)
{
cc.KeyDown += new KeyEventHandler(keypressed);
}
}
}
// Add arithmetical functions, erase all and equals buttons and corresponding callbacks
private void AddArithmeticFunctions()
{
CalcButton eraseAll = new CalcButton();
eraseAll.key = keyDict["Delete"];
keysToButtons[keyDict["Delete"]] = eraseAll;
tlpArithmetics.Controls.Add(eraseAll, 0, 0);
eraseAll.Text = "CE";
eraseAll.Click += (sender, e) =>
{
currentFunc = null;
previousValue = 0;
currentValue = 0;
lbCalcHistory.Text = "";
newCalcStarted = true;
tbOutput.Text = "0";
};
int rowIdx = 1;
foreach (string s in arOpsList)
{
FuncButton btn = new FuncButton(arOps[s]);
if (keyDict.Keys.Contains(btn.func.Method.Name))
{
Keys k = keyDict[btn.func.Method.Name];
keysToButtons[k] = btn;
}
tlpArithmetics.Controls.Add(btn, 0, rowIdx);
btn.Text = s;
rowIdx++;
// The minus button is to be handled differently from the others to allow entry
// of negative numbers
if (s == "-")
{
btn.Click += (sender, e) =>
{
// user entering negative number
if (tbOutput.Text == "0" || newCalcStarted)
{
if (newCalcStarted)
{
lbCalcHistory.Text = "";
}
tbOutput.Text = "-";
newCalcStarted = false;
}
else if (Double.TryParse(tbOutput.Text, out currentValue))
{
//if (!(Double.IsNaN(currentValue))) performOp(s, btn);
setCurrentFunc(s, btn);
}
};
}
else
{
btn.Click += (sender, e) =>
{
if (Double.TryParse(tbOutput.Text, out currentValue))
{
//if (!(Double.IsNaN(currentValue))) performOp(s, btn);
setCurrentFunc(s, btn);
}
};
}
}
CalcButton equals = new CalcButton();
tlpArithmetics.Controls.Add(equals, 0, rowIdx);
equals.key = keyDict["Return"];
keysToButtons[keyDict["Return"]] = equals;
equals.Text = "=";
equals.Click += (sender, e) =>
{
if (currentFunc != null)
{
if (Double.TryParse(tbOutput.Text, out currentValue))
{
try
{
double result = (double)currentFunc.DynamicInvoke(previousValue, currentValue);
lbCalcHistory.Text += (" " + tbOutput.Text);
tbOutput.Text = result.ToString();
previousValue = result;
currentFunc = null;
}
catch (TargetInvocationException ex)
{
if (ex.InnerException is DivideByZeroException)
{
lbCalcHistory.Text += (" " + tbOutput.Text);
tbOutput.Text = "INF";
previousValue = 0;
currentFunc = null;
}
}
newCalcStarted = true;
}
}
};
}