/// <summary>
/// CurrentIndexProperty property changed handler.
/// </summary>
/// <param name="d">DomainUpDown instance that changed its CurrentIndex.</param>
/// <param name="e">Event arguments.</param>
private static void OnCurrentIndexPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DomainUpDown source = (DomainUpDown)d;
int newValue = (int)e.NewValue;
int oldValue = (int)e.OldValue;
// validate newValue
if (!source.IsValidCurrentIndex(newValue))
{
// revert back to e.OldValue
source._currentIndexNestLevel++;
source.SetValue(e.Property, e.OldValue);
source._currentIndexNestLevel--;
if (source._currentIndexDuringInitialization == null)
{
// index is set but no items have been added yet
// cache the value
source._currentIndexDuringInitialization = newValue;
return;
}
else
{
// throw exception
string message = string.Format(
CultureInfo.InvariantCulture,
Properties.Resources.DomainUpDown_CurrentIndex_InvalidValue,
e.NewValue);
throw new ArgumentOutOfRangeException("e", message);
}
}
if (source._currentIndexNestLevel == 0)
{
// remember initial state
source._initialCurrentIndex = oldValue;
}
source._currentIndexNestLevel++;
// coerce newValue
int coercedValue = source.CoerceSelectedIndex(newValue);
if (newValue != coercedValue)
{
// always set SelectedIndexProperty to coerced value
source.CurrentIndex = coercedValue;
}
source._currentIndexNestLevel--;
if (source._currentIndexNestLevel == 0 && source.CurrentIndex != source._initialCurrentIndex)
{
// fire changed event only at root level and when there is indeed a change
source.OnCurrentIndexChanged(oldValue, source.CurrentIndex);
}
}
/// <summary>
/// ItemsSourceProperty property changed handler.
/// </summary>
/// <param name="d">DomainUpDown that changed its ItemsSource.</param>
/// <param name="e">Event arguments.</param>
private static void OnItemsSourcePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DomainUpDown dud = (DomainUpDown)d;
dud.OnItemsSourceChanged(e.OldValue as IEnumerable, e.NewValue as IEnumerable);
}
/// <summary>
/// IsCyclicProperty property changed handler.
/// </summary>
/// <param name="d">DomainUpDown instance that changed its IsCyclic value.</param>
/// <param name="e">Event arguments.</param>
private static void OnIsCyclicPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DomainUpDown source = (DomainUpDown)d;
source.SetValidSpinDirection();
}
