/// <summary>
/// Updata a selected item in listbox
/// check the reasonablility of the input data,if rules are violated, warn the user.
/// </summary>
private void btnUpdate_Click(object sender, EventArgs e)
{
int selected = lstOutoput.SelectedIndex;
if (txtSelect.Text.Length > 0)
{
if (txtSelect.Text.Length == 0)
{
MessageBox.Show("Please enter a valid data", "Error");
}
else if (txtSelect.Text.Length == 1)
{
if (txtSelect.Text.Contains("#") || txtSelect.Text.Contains("="))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Replace(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
else
{
char ch = txtSelect.Text[0]; //first character in the text box
char ch1 = txtSelect.Text[1]; //second character,numeric
char ch2 = txtSelect.Text[txtSelect.Text.Length - 1]; //last charac, +-*/=#
if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
{
if (((ch1 >= (char)48) && (ch1 <= (char)57)) && ((ch2 >= (char)48) && (ch2 <= (char)57)))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Replace(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
}
else
{
MessageBox.Show("Please enter valid value.");
}
}
/// <summary>
/// delete a selected item in listbox, give warning before deleting.
/// </summary>
private void btnDelete_Click(object sender, EventArgs e)
{
int selected = lstOutoput.SelectedIndex;
if (txtSelect.Text != null)
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
if (MessageBox.Show("Do you want to delete this item?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
{
calculation.Delete(selected);
txtSelect.Text = "";
}
else
{
return;
}
}
}
/// <summary> method Replace
/// Replace the nth CalcLine object in the ArrayList with the newCalc object, and then redisplay the calculations.
/// </summary>
public void Replace(CalcLine newCalc, int n)
{
this.theCalcs[n] = newCalc;
Redisplay();
lstDisplay.SelectedIndex = n;
}
/// <summary> method Add
/// Add a CalcLine object to the ArrayList then redisplay the calculations.
/// </summary>
public void Add(CalcLine cl)
{
this.theCalcs.Add(cl);
Redisplay();
}
/// <summary> method Insert
/// Insert the newCalc CalcLine object in the ArrayList immediately before the nth object, and then redisplay the
/// calculations.
/// </summary>
public void Insert(CalcLine newCalc, int n)
{
this.theCalcs.Insert(n, newCalc);
Redisplay();
lstDisplay.SelectedIndex = n;
}
/// <summary>
/// If enter is pressed and the add calculation textbox is empty,
/// send notice to user to enter a calculation.
/// </summary>
private void txtEnter_KeyUp(object sender, KeyEventArgs e)
{
string txt = txtEnter.Text;
if (lstOutoput.Items.Count == 0)
{
if (txt.Length == 0)//enter key is not allowed if no calculation have begun
{
if (e.KeyCode == Keys.Enter)
{
MessageBox.Show("No calculations have begun,Enter key is not allowed", "Invalid Request");
}
else
{
return;
}
}
else if (txt.Length == 1)
{
if (txt[0].ToString() == "#" || txt[0].ToString() == "=")//no total or subtotal for the first line.
{
MessageBox.Show("No calculation available. \n So no subtotal or total can be displayed", "Invalid Request");
txtEnter.Text = "";
}
else if (!(txt[0].ToString() == "+" || txt[0].ToString() == "-"))//first character must be "+" or "-" for the first line
{
MessageBox.Show("First data entry must be either \'+\' or \'-\' as the beginning operator", "Invalid First Data Entry");
txtEnter.Text = "";
}
}
else
{
if (txt[1] >= (char)48 && txt[1] <= (char)57)//numeric after an operator
{
//to decide if last one is a valid operator ,then add the front data to listbox
char ch = txt[txt.Length - 1];
if (ch == '#' || ch == '=' || e.KeyCode == Keys.Enter)//# = enter
{
if (e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length)));
}
else
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length - 1)));
}
if (ch == '=' || e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine("="));
}
else if (ch == '#')
{
calculation.Add(new CalcLine("#"));
}
txtEnter.Text = "";
}
else if ((ch == '+') || (ch == '-') || (ch == '*') || (ch == '/'))//add the front data to listbox
{
CalcLine calcline = new CalcLine(txt.Substring(0, txt.Length - 1));
calculation.Add(calcline);
txtEnter.Text = txt[txt.Length - 1].ToString();
txtEnter.Focus();
txtEnter.SelectionStart = txtEnter.Text.Length;
}
else if (!(ch >= (char)48) && (ch <= (char)57))//numeric
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
}
//lstOutoput.Items.Count > 0
else
{
//if last item in the list box is total,then consider as listbox is empty
if (lstOutoput.Items[lstOutoput.Items.Count - 1].ToString().Contains("="))
{
if (txt.Length == 0)
{
return;
}
else if (txt.Length == 1)
{
if (txt[0].ToString() == "#" || txt[0].ToString() == "=")
{
MessageBox.Show("No calculation available. \n So no subtotal or total can be displayed", "Invalid Request");
txtEnter.Text = "";
}
else if (!(txt[0].ToString() == "+" || txt[0].ToString() == "-"))
{
MessageBox.Show("First data entry must be either \'+\' or \'-\' as the beginning operator", "Invalid First Data Entry");
txtEnter.Text = "";
}
}
else
{
char ch = txt[txt.Length - 1];
if (txt[1] >= (char)48 && txt[1] <= (char)57)
{
if (ch == '#' || ch == '=' || e.KeyCode == Keys.Enter)//# =
{
if (e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length)));
}
else
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length - 1)));
}
if (ch == '=' || e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine("="));
}
else if (ch == '#')
{
calculation.Add(new CalcLine("#"));
}
txtEnter.Text = "";
}
else if ((ch == '+') || (ch == '-') || (ch == '*') || (ch == '/'))
{
CalcLine calcline = new CalcLine(txt.Substring(0, txt.Length - 1));
calculation.Add(calcline);
txtEnter.Text = txt[txt.Length - 1].ToString();
txtEnter.Focus();
txtEnter.SelectionStart = txtEnter.Text.Length;
}
else if (!(ch >= (char)48) && (ch <= (char)57))
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
}
else
{
if (txt.Length == 0)
{
return;
}
else if (txt.Length == 1)
{
if (!(txt[0].ToString() == "#" || txt[0].ToString() == "=" || txt[0].ToString() == "+" || txt[0].ToString() == "-" || txt[0].ToString() == "*" || txt[0].ToString() == "/" || e.KeyCode == Keys.Enter))
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
else
{
if (txt[1] >= (char)48 && txt[1] <= (char)57)
{
char ch = txt[txt.Length - 1];
if ((ch == '#') || (ch == '=') || e.KeyCode == Keys.Enter)//# =
{
if (e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length)));
}
else
{
calculation.Add(new CalcLine(txt.Substring(0, txt.Length - 1)));
}
if (ch == '=' || e.KeyCode == Keys.Enter)
{
calculation.Add(new CalcLine("="));
}
else if (ch == '#')
{
calculation.Add(new CalcLine("#"));
}
txtEnter.Text = "";
}
else if ((ch == '+') || (ch == '-') || (ch == '*') || (ch == '/'))
{
CalcLine calcline = new CalcLine(txt.Substring(0, txt.Length - 1));
calculation.Add(calcline);
txtEnter.Text = txt[txt.Length - 1].ToString();
txtEnter.Focus();
txtEnter.SelectionStart = txtEnter.Text.Length;
}
else if (!(ch >= (char)48) && (ch <= (char)57))
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtEnter.Text = "";
}
}
}
}
}
/// <summary>
/// Insert a selected calculation line.
/// Update according to the calculation rules
/// If rules are violated, warn the user.
/// </summary>
private void btnInsert_Click(object sender, EventArgs e)
{
int selected = lstOutoput.SelectedIndex;
if (selected == 0)//if the insert line will be the first line
{
if (txtSelect.Text.Length == 0)
{
MessageBox.Show("Please enter a valid data", "Error");
}
else if (txtSelect.Text.Length == 1)
{
if (txtSelect.Text.Contains("#") || txtSelect.Text.Contains("="))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
else
{
char ch = txtSelect.Text[0];
char ch1 = txtSelect.Text[1];
char ch2 = txtSelect.Text[txtSelect.Text.Length - 1];
if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
{
if (((ch1 >= (char)48) && (ch1 <= (char)57)) && ((ch2 >= (char)48) && (ch2 <= (char)57)))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
}
else
{
if (lstOutoput.Items[selected - 1].ToString().Contains("="))//decide if the item before selected item is total,then obry the rule of first charac.
{
if (txtSelect.Text.Length == 0)
{
MessageBox.Show("Please enter a valid data", "Error");
}
else if (txtSelect.Text.Length == 1)
{
if (txtSelect.Text[0] != '#' || txtSelect.Text[0] != '=')
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
else
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
}
else
{
if (!(txtSelect.Text[0] == '+' || txtSelect.Text[0] == '-'))
{
MessageBox.Show("First data entry must be either \'+\' or \'-\' as the beginning operator", "Invalid First Data Entry");
txtEnter.Text = "";
}
else
{
char ch1 = txtSelect.Text[1];
char ch2 = txtSelect.Text[txtSelect.Text.Length - 1];
if (((ch1 >= (char)48) && (ch1 <= (char)57)) && ((ch2 >= (char)48) && (ch2 <= (char)57)))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
}
}
else//decide if input resonable
{
if (txtSelect.Text.Length == 0)
{
MessageBox.Show("Please enter a valid data", "Error");
}
else if (txtSelect.Text.Length == 1)
{
if (txtSelect.Text[0] == '#' || txtSelect.Text[0] == '+')
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
txtSelect.Text = "";
}
}
else if (txtSelect.Text[0] == '+' || txtSelect.Text[0] == '-' || txtSelect.Text[0] == '*' || txtSelect.Text[0] == '/')
{
char ch = txtSelect.Text[0];
char ch1 = txtSelect.Text[1];
char ch2 = txtSelect.Text[txtSelect.Text.Length - 1];
if (((ch1 >= (char)48) && (ch1 <= (char)57)) && ((ch2 >= (char)48) && (ch2 <= (char)57)))
{
CalcLine calcline = new CalcLine(this.txtSelect.Text);
calculation.Insert(calcline, selected);
txtSelect.Text = "";
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
else
{
MessageBox.Show("Incorrect data format", "Invalid Data Format");
}
}
}
}