/// <summary>
/// Handles changes to the ParentCollection property.
/// </summary>
private static void OnParentCollectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CityFilter target = (CityFilter)d;
IEnumerable <CityItem> oldParentCollection = (IEnumerable <CityItem>)e.OldValue;
if (target.filterPresenter != null)
{
bool isActive = target.IsActive;
if (isActive)
{
target.IsActive = false;
}
target.filterPresenter.ReceiveFilterChanged(target);
if (isActive)
{
target.IsActive = true;
}
}
IEnumerable <CityItem> newParentCollection = target.ParentCollection;
target.filterPresenter = FilterPresenter.TryGet(newParentCollection);
if (target.filterPresenter != null)
{
target.filterPresenter.ReceiveFilterChanged(target);
}
target.OnParentCollectionChanged(oldParentCollection, newParentCollection);
}
/// <summary>
/// Handles changes to the Country property.
/// </summary>
private static void OnCountryChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CityFilter target = (CityFilter)d;
string oldCountry = (string)e.OldValue;
string newCountry = target.Country;
if (target.filterPresenter != null)
{
target.filterPresenter.ReceiveFilterChanged(target);
}
target.OnCountryChanged(oldCountry, newCountry);
}
/// <summary>
/// Handles changes to the IsActive property.
/// </summary>
private static void OnIsActiveChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CityFilter target = (CityFilter)d;
if (target.filterPresenter != null)
{
target.filterPresenter.ReceiveFilterChanged(target);
}
bool oldIsActive = (bool)e.OldValue;
bool newIsActive = target.IsActive;
target.OnIsActiveChanged(oldIsActive, newIsActive);
}
