private void OnUndoPressed(object sender, EventArgs e)
{
sbInBound.Clear();
InBound.Clear();
this.FindByName <Label>("Input").Text = string.Empty;
Fraction_class workFraction = new Fraction_class();
workFraction.SetValueTo(Accumulator);
Accumulator.SetValueTo(UndoAccum);
sbAccumulator.Clear();
if (displayToggle == DisplayToggle.floating)
{
sbAccumulator.Append(Accumulator.ToDisplayFloat(" "));
}
else
{
sbAccumulator.Append(Accumulator.ToDisplayFraction(" "));
}
this.FindByName <Label>("Result").Text = sbAccumulator.ToString();
lastOperator = ' ';
UndoAccum.SetValueTo(workFraction); // next undo will circle back
}
/// <summary>
/// OnMemoryLoadPressed() - Initially the M+ key ready to receive data from Accumulator.
/// - Stores the data until M- or MC key is hit.
/// - M+ key puts Accumulator data in memory.
/// - M- moves memory to InBound, and clears memory.
///
/// </summary>
/// <remarks>
/// Side effects - MemButton keytop toggles between M+ and M-.
/// - if initially M+ Memory is set to Accumulator and toggles to M-.
/// - if initially M- InBound is set to Memory, Memory is cleared, and toggles to M+.
/// </remarks>
private void OnMemoryLoadPressed(object sender, EventArgs e)
{
string keyToggle = this.FindByName <Button>("MemButton").Text;
if (keyToggle == "M+")
{
MemorySave.SetValueTo(Accumulator);
this.FindByName <Button>("MemButton").Text = "M-";
}
else
{
InBound.SetValueTo(MemorySave);
MemorySave.Clear();
this.FindByName <Button>("MemButton").Text = "M+";
sbInBound.Clear();
if (displayToggle == DisplayToggle.floating)
{
sbInBound.Append(InBound.ToDisplayFloat(" "));
}
else
{
sbInBound.Append(InBound.ToDisplayFraction(" "));
}
this.FindByName <Label>("Input").Text = sbInBound.ToString();
}
}
// try/catch?
private void OnOperatorPressed(object sender, EventArgs e)
{
// procedurally there's no input yet, maybe better way to do this
if (this.FindByName <Label>("Input").Text is null || this.FindByName <Label>("Input").Text.Trim().Length == 0)
{
lastOperator = (sender as Button).Text.ToCharArray()[0];
return;
}
//
if (InBound.Parse(sbInBound.ToString()) == false)
{
this.FindByName <Label>("Input").Text = String.Empty; // nasty error response.
sbInBound.Clear();
return;
}
sbInBound.Clear();
this.FindByName <Label>("Input").Text = sbInBound.ToString();
UndoAccum.SetValueTo(Accumulator);
switch (lastOperator)
{
case '+':
Accumulator.Add(InBound);
break;
case '-':
Accumulator.Subtract(InBound);
break;
case '/':
Accumulator.DivideBy(InBound);
break;
case '*':
Accumulator.MultiplyBy(InBound);
break;
case '=':
if (Accumulator.ToDisplayFloat("0") == "0")
{
Accumulator.SetValueTo(InBound);
}
break;
case '%':
Accumulator.Modulus(InBound);
break;
default:
//-- Accumulator.SetValueTo(InBound);
break;
}
;
lastOperator = (sender as Button).Text.ToCharArray()[0];
sbAccumulator.Clear(); // whats the best way to set stringbuilder?
if (displayToggle == DisplayToggle.fractional)
{
sbAccumulator.Append(Accumulator.ToDisplayFraction());
}
else
{
sbAccumulator.Append(Accumulator.ToDisplayFloat());
}
this.FindByName <Label>("Result").Text = sbAccumulator.ToString();
this.FindByName <Label>("Result").FontSize =
shrinkLabel(this.FindByName <Label>("Result"), 16, 30, sbAccumulator.ToString());
}