/// <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);
}
public CategoryFilterView()
{
InitializeComponent();
// Define Filter that must be use.
EqualFilterInitializer initializer = new EqualFilterInitializer();
// Get FilterPresenter that connected to default collection view for Workspace.This.Products collection.
FilterPresenter productsCollectionViewFilterPresenter = FilterPresenter.TryGet(Workspace.This.Products);
// Get EqualFilter that use Category item property.
EqualFilter filter = ((EqualFilter)(productsCollectionViewFilterPresenter.TryGetFilter("Category", initializer)));
// Use instance of EqualFilter as Model.
Model = filter;
}
private void UserControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
OrdersVm vm = e.NewValue as OrdersVm;
if (vm != null)
{
FilterPresenter fpr = FilterPresenter.TryGet(vm.OrdersCollectionView);
filter = fpr.TryGetFilter("Employee", new EqualFilterInitializer());
if (filter != null)
{
if (filter.IsActive)
{
VisualStateManager.GoToState(this, "Filtered", false);
}
else
{
VisualStateManager.GoToState(this, "Unfiltered", false);
}
filter.PropertyChanged += filter_PropertyChanged;
}
}
}