/// <summary>
/// Whenever any registered OptionControl raises the FilterChanged property changed event, we need to rebuild
/// the new predicate used to filter the CollectionView. Since Multiple Columns can have predicate we need to
/// iterate over all registered OptionControls and get each predicate.
/// </summary>
/// <param name="sender">The object which has risen the event</param>
/// <param name="e">The property which has been changed</param>
void filter_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "FilterChanged")
{
Predicate <object> predicate = null;
foreach (var filter in Filters)
{
if (filter.HasPredicate)
{
if (predicate == null)
{
predicate = filter.GeneratePredicate();
}
else
{
predicate = predicate.And(filter.GeneratePredicate());
}
}
}
bool canContinue = true;
var args = new CancelableFilterChangedEventArgs(predicate);
if (BeforeFilterChanged != null && !IsResetting)
{
BeforeFilterChanged(this, args);
canContinue = !args.Cancel;
}
if (canContinue)
{
ListCollectionView view = CollectionViewSource.GetDefaultView(this.ItemsSource) as ListCollectionView;
if (view != null && view.IsEditingItem)
{
view.CommitEdit();
}
if (view != null && view.IsAddingNew)
{
view.CommitNew();
}
if (CollectionView != null)
{
CollectionView.Filter = predicate;
}
if (AfterFilterChanged != null)
{
AfterFilterChanged(this, new FilterChangedEventArgs(predicate));
}
}
else
{
IsResetting = true;
var ctrl = sender as ColumnFilterControl;
ctrl.ResetControl();
IsResetting = false;
}
}
}
public void FirePredicationGeneration()
{
{
Predicate <object> predicate = null;
foreach (var filter in Filters)
{
if (filter.HasPredicate)
{
if (predicate == null)
{
predicate = filter.GeneratePredicate();
}
else
{
predicate = predicate.And(filter.GeneratePredicate());
}
}
}
bool canContinue = true;
var args = new CancelableFilterChangedEventArgs(predicate);
if (BeforeFilterChanged != null && !IsResetting)
{
BeforeFilterChanged(this, args);
canContinue = !args.Cancel;
}
if (canContinue)
{
ListCollectionView view = CollectionViewSource.GetDefaultView(this.ItemsSource) as ListCollectionView;
if (view != null && view.IsEditingItem)
{
view.CommitEdit();
}
if (view != null && view.IsAddingNew)
{
view.CommitNew();
}
if (CollectionView != null)
{
CollectionView.Filter = predicate;
}
if (AfterFilterChanged != null)
{
AfterFilterChanged(this, new FilterChangedEventArgs(predicate));
}
}
else
{
IsResetting = true;
IsResetting = false;
}
}
}
