// Sets current function in response to function key press
private void setCurrentFunc(string s, FuncButton btn)
{
if (currentFunc != null)
{
try
{
previousValue = (double)currentFunc.DynamicInvoke(previousValue, currentValue);
lbCalcHistory.Text = previousValue.ToString() + " " + s;
tbOutput.Text = "0";
}
catch (TargetInvocationException ex)
{
if (ex.InnerException is DivideByZeroException)
{
lbCalcHistory.Text += (" " + tbOutput.Text);
tbOutput.Text = "INF";
previousValue = 0;
currentFunc = null;
}
}
}
else
{
previousValue = currentValue;
lbCalcHistory.Text = tbOutput.Text + " " + s;
tbOutput.Text = "0";
}
currentFunc = (Func <double, double, double>)btn.func;
newCalcStarted = false;
}
// Add advanced functions and corresponding callbacks
private void AddAdvancedFunctions()
{
int rowIdx = 0;
foreach (string s in advOpList)
{
FuncButton btn = new FuncButton(advOps[s]);
tlpAdvanced.Controls.Add(btn, 0, rowIdx);
btn.Text = s;
rowIdx++;
btn.Click += (sender, e) =>
{
if (Double.TryParse(tbOutput.Text, out currentValue))
{
if (currentFunc != null)
{
try
{
currentValue = (double)currentFunc.DynamicInvoke(previousValue, currentValue);
}
catch (TargetInvocationException ex)
{
if (ex.InnerException is DivideByZeroException)
{
lbCalcHistory.Text += (" " + tbOutput.Text);
tbOutput.Text = "INF";
previousValue = 0;
currentFunc = null;
return;
}
}
}
if (btn.Text == "1/x")
{
lbCalcHistory.Text = ("1/" + currentValue);
}
// square
else if (btn.Text == "x\xB2")
{
lbCalcHistory.Text = String.Format("{0} * {0}", currentValue.ToString());
}
else
{
lbCalcHistory.Text = String.Format("{0}({1})", btn.Text, currentValue);
}
try
{
currentValue = (double)btn.func.DynamicInvoke(currentValue);
tbOutput.Text = currentValue.ToString();
}
catch (TargetInvocationException ex)
{
if (ex.InnerException is DivideByZeroException)
{
lbCalcHistory.Text += (" " + tbOutput.Text);
tbOutput.Text = "INF";
previousValue = 0;
currentFunc = null;
return;
}
}
newCalcStarted = true;
currentFunc = null;
}
};
}
}
// 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;
}
}
};
}