/// <summary>
/// This method is called when the Change button is pressed in the GUI.
/// A new book object is saved with the changed book data at the same index
/// in the bookList. This is only done if input is validated and if index
/// is in the range of the bookList. If so, the GUI is updated.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Change_Click(object sender, EventArgs e)
{
// Read book data returns an assigned book object
Book book = ReadData();
// The selected index i the listbox
int selectedIndex = lbx_BookList.SelectedIndex;
// Is input validated and an index selected in the listbox?
if (ValidateInput(book) && selectedIndex >= 0)
{
// The book data is changed at index in book list
myBookManager.ChangeBook(selectedIndex, book);
// The GUI is updated
UpdateGUI();
// The listbox is unselcted
lbx_BookList.ClearSelected();
// Add button is enabled
btn_AddBook.Enabled = true;
}
}
