public static void addTradePartner(AVLTree <Country> Countries, ComboBox cbAddTradePartner, ListBox listBoxCountries)
{
Country country = Countries.GetItem(new Country((String)listBoxCountries.SelectedItem));
String countryAdding = (string)cbAddTradePartner.SelectedItem;
Countries.updateItem(country.CountryName, addTradePartner(country, countryAdding));
Countries.updateItem(countryAdding, addTradePartner(Countries.GetItem(new Country(countryAdding)), country.CountryName));
}
// Part 2
public static void updateCountry(ref AVLTree <Country> Countries, string updating, ListBox listBoxCountries, TextBox txtName, TextBox txtGpdGrowth, TextBox txtInflation, TextBox txtTradeBalance, TextBox txtHdiRanking)
{
Country county = Countries.GetItem(new Country((String)listBoxCountries.SelectedItem));
string oldName = county.CountryName;
switch (updating)
{
case "Name": county.CountryName = txtName.Text; break;
case "GPD": county.GpdGrowth = float.Parse(txtGpdGrowth.Text); break;
case "Inflation": county.Inflation = float.Parse(txtInflation.Text); break;
case "TradeBalance": county.TradeBalance = float.Parse(txtTradeBalance.Text); break;
case "HdiRanking": county.HdiRanking = int.Parse(txtHdiRanking.Text); break;
}
Countries.updateItem(oldName, county);
// Updates countries that previously traded with the changed countries old name, to its new name
if ("Name".Equals(updating))
{
string[] countryText = Program.getCountries(Countries);
foreach (string s in countryText)
{
Boolean changed = false;
Country temp = Countries.GetItem(new Country(s));
for (int i = 0; i < temp.MainTradePartners.Length; i++)
{
if (oldName.Equals(temp.MainTradePartners[i]))
{
temp.MainTradePartners[i] = txtName.Text;
changed = true;
}
}
if (changed)
{
Countries.updateItem(temp.CountryName, temp);
}
}
}
}
// Part 4
public static void deleteCountry(ref AVLTree <Country> Countries, ListBox listBoxCountries, Label lblInfo, TextBox txtSearch, CheckBox checkBoxTradingPartner)
{
if (listBoxCountries.SelectedIndex != -1)
{
String country = (String)listBoxCountries.SelectedItem;
// simply removing the country from the AVL Tree
Countries.RemoveItem(country);
// removing all instances from other countries that traded with the removed country
string[] countryNames = getCountries(Countries);
foreach (string c in countryNames)
{
Countries.updateItem(c, removedCountryPartner(Countries.GetItem(new Country(c)), country));
}
// updates fields
setAvlData(lblInfo, Countries);
txtSearch.Text = "";
showCountries(txtSearch.Text, listBoxCountries, Countries, checkBoxTradingPartner);
}
}
