/// <summary>
/// Inserts blanks entries before the current location.
/// The current location becomes the first inserted item.
/// </summary>
/// <param name="quantity">Number of entries to insert.</param>
public virtual void Insert(int quantity = 1)
{
// Shifts current indices
if (_fonts.MoveLast())
{
do
{
if (_fonts.CurrentKey >= _index)
{
Font currentFont = _fonts.CurrentValue;
int newKey = _fonts.CurrentKey + quantity;
_fonts.Remove();
_fonts.Add(newKey, currentFont);
}
} while (_fonts.MovePrevious());
}
// Adds blank spaces
for (int i = _index; i < _index + quantity; i++)
{
_fonts.Add(_index, null);
}
}