/// <summary>
/// Returns a rotating enumerator of Style objects that coordinates with
/// the style dispenser object to ensure that no two enumerators are
/// currently on the same style if possible. If the style
/// dispenser is reset or its collection of styles is changed then
/// the enumerators will also be reset.
/// </summary>
/// <param name="stylePredicate">A predicate that returns a value
/// indicating whether to return a style.</param>
/// <returns>An enumerator of styles.</returns>
public IEnumerator <Style> GetStylesWhere(Func <Style, bool> stylePredicate)
{
StyleEnumerator enumerator = new StyleEnumerator(this, stylePredicate);
_ignoreStyleDispensedByEnumerator = true;
try
{
foreach (StyleDispensedEventArgs args in _stylesDispensed)
{
enumerator.StyleDispenserStyleDispensed(this, args);
}
}
finally
{
_ignoreStyleDispensedByEnumerator = false;
}
_styleEnumerators.Add(enumerator);
return(enumerator);
}
/// <summary>
/// Unregisters a style enumerator so that it can be garbage collected.
/// </summary>
/// <param name="enumerator">The style enumerator.</param>
internal void Unregister(StyleEnumerator enumerator)
{
_styleEnumerators.Remove(enumerator);
}