// Precondition: Insert, Letter menu item activated
// Postcondition: The Letter dialog box is displayed. If data entered
// are OK, a Letter is created and added to the list
// of parcels
private void letterToolStripMenuItem_Click(object sender, EventArgs e)
{
LetterForm letterForm; // The letter dialog box form
DialogResult result; // The result of showing form as dialog
decimal fixedCost; // The letter's cost
if (upv.AddressCount < LetterForm.MIN_ADDRESSES) // Make sure we have enough addresses
{
MessageBox.Show("Need " + LetterForm.MIN_ADDRESSES + " addresses to create letter!",
"Addresses Error");
return; // Exit now since can't create valid letter
}
letterForm = new LetterForm(upv.AddressList); // Send list of addresses
result = letterForm.ShowDialog();
if (result == DialogResult.OK) // Only add if OK
{
if (decimal.TryParse(letterForm.FixedCostText, out fixedCost))
{
// For this to work, LetterForm's combo boxes need to be in same
// order as upv's AddressList
upv.AddLetter(upv.AddressAt(letterForm.OriginAddressIndex),
upv.AddressAt(letterForm.DestinationAddressIndex),
fixedCost); // Letter to be inserted
}
else // This should never happen if form validation works!
{
MessageBox.Show("Problem with Letter Validation!", "Validation Error");
}
}
letterForm.Dispose(); // Best practice for dialog boxes
// Alternatively, use with using clause as in Ch. 17
}
// Precondition: Insert, Letter menu item activated
// Postcondition: The Letter dialog box is displayed. If data entered
// are OK, a Letter is created and added to the list
// of parcels
private void letterToolStripMenuItem_Click(object sender, EventArgs e)
{
LetterForm letterForm; // The letter dialog box form
DialogResult result; // The result of showing form as dialog
if (upv.AddressCount < LetterForm.MIN_ADDRESSES) // Make sure we have enough addresses
{
MessageBox.Show("Need " + LetterForm.MIN_ADDRESSES + " addresses to create letter!",
"Addresses Error");
return;
}
letterForm = new LetterForm(upv.AddressList); // Send list of addresses
result = letterForm.ShowDialog();
if (result == DialogResult.OK) // Only add if OK
{
try
{
// For this to work, LetterForm's combo boxes need to be in same
// order as upv's AddressList
upv.AddLetter(upv.AddressAt(letterForm.OriginAddressIndex),
upv.AddressAt(letterForm.DestinationAddressIndex),
decimal.Parse(letterForm.FixedCostText)); // Letter to be inserted
}
catch (FormatException) // This should never happen if form validation works!
{
MessageBox.Show("Problem with Letter Validation!", "Validation Error");
}
}
letterForm.Dispose(); // Best practice for dialog boxes
}
//Precondition: Origin address, destination address, and fixed cost must have values
//Postconditon: Shows form and creates a letter
private void letterToolStripMenuItem_Click(object sender, EventArgs e)
{
LetterForm lfrm = new LetterForm(upv.AddressList); //New LetterForm object
DialogResult result = lfrm.ShowDialog();
if (result == DialogResult.OK)
{
upv.AddLetter(upv.AddressAt(lfrm.OriginValue), upv.AddressAt(lfrm.DestValue),
decimal.Parse(lfrm.FixedCost));
}
lfrm.Dispose();
}
//Precondition: click, upv.address must be instantiated with more than 2 addresses
//Postcondition: Show Letter Form, add letter to upv parcel list
private void letterToolStripMenuItem_Click(object sender, EventArgs e)
{
LetterForm LF = new LetterForm(upv.addresses); //create LetterForm object, pass upv.AddressList into the constructor
DialogResult result; //holds dialog result OK/Cancel
result = LF.ShowDialog(); //shows form as a modal dialog box
if (result == DialogResult.OK) //result == OK? add the selected indices and parsed fixed cost to the parcel list
{
//Precondition: origin address and destination address Indices cannot be Equal, fixed cost must be a decimal value
//Postcondition: Add Letter to UserParcelView parcel list
upv.AddLetter(LF.AddressList[LF.OriginIndex], LF.AddressList[LF.DestinationIndex], decimal.Parse(LF.FixedCost));
}
else
if (result == DialogResult.Cancel) //Dispose of resources if result == cancel
{
LF.Dispose();
}
}
