//Checks for valid input for Rx textboxes. Checks the box passed in through "tb, "
//using different criteria based on parameter the box represents (determined by "box").
//Checks for valid ranges, does not check for valid increments.
/// <summary>
/// Checks for valid input for an Rx textbox
/// </summary>
/// <param name="tb">The box to check the contents of</param>
/// <param name="box">The Rx parameter - Sphere, Cylinder, Axis or Add</param>
/// <returns>True if the contents are valid, false otherwise</returns>
/// <exception cref="System.FormatException">Thrown when the text is not a proper integer or real number</exception>
private bool Rx_TextBox_Valid(TextBoxBase tb, RxBox box)
{
int pos = tb.Text.LastIndexOf('.');
float val;
if (box == RxBox.Axis)
{
if (tb.TextLength == 0) //Blank
{
tb.Text = "0";
}
try
{ //Is the contents a valid integer?
val = Math.Abs(Convert.ToInt16(tb.Text));
}
catch
{
return(false);
}
tb.DeselectAll();
tb.Text = val.ToString("0");
//Checks for valid range
if (val > AXIS_MAX_VALUE)
{
return(false);
}
}
else //Sphere, Cylinder or Add
{
if (tb.TextLength == 0)
{
tb.Text = "0.00";
}
try
{ //Is the contents a valid real number?
val = Convert.ToSingle(tb.Text);
}
catch
{
return(false);
}
tb.DeselectAll();
if (pos > -1) //Handle decimal
{
string ts = tb.Text.Substring(pos + 1);
if (ts == "2" || ts == "7")
{
if (val < 0)
{
val -= 0.05F;
}
else
{
val += 0.05F;
}
}
}
// if(box == RxBox.Cyl)
// val = -Math.Abs(val); // CYL is converted later if necessary
tb.Text = val.ToString("0.00");
//Checks for valid range
if (box == RxBox.Sphere)
{
if (val > SPHERE_MAX_VALUE)
{
return(false);
}
}
else if (box == RxBox.Cyl)
{
if (-val > CYLINDER_MAX_VALUE)
{
return(false);
}
}
else
{
if (val > ADD_MAX_VALUE)
{
return(false);
}
}
}
return(true);
}