private IQueryable FilterQueryable(IQueryable queryable)
{
// Filters a queryable to match this Group's clause.
// This method does not apply the AutoFilter clauses or the FilterRow clauses.
// It is the DataGridVirtualizingQueryableCollectionViewGroupRoot's job to do so on the
// base queryable used as a base for all other queryables.
if (queryable == null)
{
throw new ArgumentNullException("queryable");
}
int level = this.Level;
DataGridVirtualizingCollectionViewBase collectionView = this.GetCollectionView();
ObservableCollection <GroupDescription> groupDescriptions = collectionView.GroupDescriptions;
Debug.Assert((groupDescriptions != null) && (level < groupDescriptions.Count));
DataGridGroupDescription groupBy = groupDescriptions[level] as DataGridGroupDescription;
Debug.Assert(groupBy != null);
ParameterExpression sharedParameterExpression = queryable.CreateParameterExpression();
Expression expression = queryable.CreateEqualExpression(sharedParameterExpression, groupBy.PropertyName, this.Name);
return(queryable.WhereFilter(sharedParameterExpression, expression));
}
protected virtual void ExecuteCore(ColumnBase column, int index)
{
var groupDescriptions = this.GroupDescriptions;
if (groupDescriptions == null)
{
return;
}
GroupDescription groupDescription = this.GetGroupDescription(column);
if (groupDescription == null)
{
groupDescription = new DataGridGroupDescription(this.GetColumnName(column));
}
var dataGridGroupDescription = groupDescription as DataGridGroupDescription;
if ((dataGridGroupDescription != null) && (dataGridGroupDescription.GroupConfiguration == null))
{
dataGridGroupDescription.GroupConfiguration = this.GetGroupConfiguration(column);
}
if (index < 0)
{
groupDescriptions.Add(groupDescription);
}
else
{
groupDescriptions.Insert(index, groupDescription);
}
}
internal static GroupConfiguration GetGroupConfiguration(DataGridContext dataGridContext, ObservableCollection <GroupDescription> groupDescriptions, GroupConfigurationSelector groupConfigSelector, int groupLevel, CollectionViewGroup collectionViewGroup)
{
if (dataGridContext == null)
{
throw new ArgumentNullException("dataGridContext");
}
if (groupDescriptions == null)
{
throw new ArgumentNullException("groupDescriptions");
}
if (groupLevel >= groupDescriptions.Count)
{
throw new ArgumentException("The specified group level is greater than the number of GroupDescriptions in the DataGridContext.", "groupLevel");
}
GroupDescription groupDescription = groupDescriptions[groupLevel];
GroupConfiguration retval = null;
DataGridGroupDescription dataGridGroupDescription = groupDescription as DataGridGroupDescription;
if ((dataGridGroupDescription != null) && (dataGridGroupDescription.GroupConfiguration != null))
{
retval = dataGridGroupDescription.GroupConfiguration;
}
else if (groupConfigSelector != null)
{
retval = groupConfigSelector.SelectGroupConfiguration(groupLevel, collectionViewGroup, groupDescription);
}
if (retval == null)
{
retval = dataGridContext.DefaultGroupConfiguration;
}
if (retval == null)
{
retval = GroupConfiguration.DefaultGroupConfiguration;
}
return(retval);
}
public override GroupConfiguration SelectGroupConfiguration(int groupLevel, CollectionViewGroup collectionViewGroup, System.ComponentModel.GroupDescription groupDescription)
{
if (m_groupConfigurationSelectorItems.Count == 0)
{
return(base.SelectGroupConfiguration(groupLevel, collectionViewGroup, groupDescription));
}
string fieldName = string.Empty;
DataGridGroupDescription dataGridGroupDescription = groupDescription as DataGridGroupDescription;
if (dataGridGroupDescription != null)
{
fieldName = dataGridGroupDescription.PropertyName;
}
else
{
PropertyGroupDescription propertyGroupDescription = groupDescription as PropertyGroupDescription;
if (propertyGroupDescription != null)
{
fieldName = propertyGroupDescription.PropertyName;
}
}
if (String.IsNullOrEmpty(fieldName) == true)
{
return(base.SelectGroupConfiguration(groupLevel, collectionViewGroup, groupDescription));
}
FieldNameGroupConfigurationSelectorItem groupConfig = m_groupConfigurationSelectorItems.GetGroupConfigurationSelectorItem(fieldName);
if (groupConfig != null)
{
return(groupConfig.GroupConfiguration);
}
return(base.SelectGroupConfiguration(groupLevel, collectionViewGroup, groupDescription));
}