/// <summary>
/// Handles <see cref="INotifyCollectionChanged.CollectionChanged"/> event of the parent collection.
/// </summary>
/// <param name="groupRecord">The group.</param>
/// <param name="sender">The sender.</param>
/// <param name="args">The event arguments.</param>
private static void OnParentCollectionChanged(GroupRecord groupRecord, object sender, NotifyCollectionChangedEventArgs args)
{
if (args.Action == NotifyCollectionChangedAction.Add)
{
if (groupRecord.ParentGroup == null)
return;
var newValue = args.NewItems[0] as GroupRecord;
if (newValue != null)
{
var parentGroup = ((IGroup) groupRecord._groupInfo.Target).ParentGroup;
if (ReferenceEquals(parentGroup, newValue._groupInfo.Target))
groupRecord.ParentRecord = newValue;
}
}
else if (args.Action == NotifyCollectionChangedAction.Remove)
{
var oldValue = args.OldItems[0] as GroupRecord;
if (oldValue != null && ReferenceEquals(oldValue, groupRecord))
groupRecord.DetachParentCollection();
}
else if (args.Action == NotifyCollectionChangedAction.Reset)
{
groupRecord.DetachParentCollection();
}
}
/// <summary>
/// Updates aggregate result collection of the group on
/// <see cref="INotifyCollectionChanged.CollectionChanged"/> event.
/// </summary>
/// <param name="groupRecord">The group.</param>
/// <param name="sender">The sender.</param>
/// <param name="args">The event arguments.</param>
private static void OnAggregateResultsCollectionChanged(GroupRecord groupRecord, object sender, NotifyCollectionChangedEventArgs args)
{
if (!groupRecord.IsAttached ||
(!groupRecord.IsExpanded && !groupRecord.IsPopulated))
return;
var group = groupRecord._groupInfo.Target as QueryableCollectionViewGroup;
if (group == null)
return;
if (args.Action == NotifyCollectionChangedAction.Remove)
{
var oldItem = (AggregateResult)args.OldItems[0];
var aggregateResult = group.AggregateResults.FirstOrDefault(x => x.FunctionName == oldItem.FunctionName);
if (aggregateResult != null)
group.AggregateResults.Remove(aggregateResult);
}
else if (args.Action == NotifyCollectionChangedAction.Reset)
{
var collection = sender as Telerik.Windows.Data.AggregateResultCollection;
var gridAggregates = collection.Select(x => x.FunctionName).ToList();
var groupAggregates = group.AggregateResults.Select(x => x.FunctionName).ToList();
var oddFunctions = new List<string>();
if (gridAggregates.Count > groupAggregates.Count)
{
oddFunctions = gridAggregates.Except(groupAggregates).ToList();
}
else if (groupAggregates.Count > gridAggregates.Count)
{
oddFunctions = groupAggregates.Except(gridAggregates).ToList();
}
if (oddFunctions.Any())
{
var aggregateFunctions =
((GridViewColumn)groupRecord._column.Target).DataControl.Columns
.SelectMany<GridViewColumn, AggregateFunction>(x => x.AggregateFunctions)
.ToDictionary(x => x.FunctionName, x => x);
foreach (var functionName in oddFunctions)
{
var aggregateResult = group.AggregateResults.FirstOrDefault(x => x.FunctionName == functionName);
if (aggregateResult != null)
{
group.AggregateResults.Remove(aggregateResult);
}
else
{
var function = aggregateFunctions[functionName];
var result = new Veyron.SharedTypes.AggregateResult
{
ColumnName = AggregateHelper.GetColumnNameByFunctionName(functionName),
SummaryType = AggregateHelper.GetAggregationTypeByFunctionName(functionName),
Value = Constants.AggregateCalculatingPlaceHolder.ToString()
};
AddAggregateResult(group, result, function);
}
}
}
}
groupRecord._aggregateResults = group.AggregateResults.ToList();
groupRecord.RefreshGroupFooter();
}
public static void SetGroupRecordInfo(UIElement element, GroupRecord value)
{
if (element != null)
element.SetValue(GroupRecordInfoProperty, value);
}
/// <summary>
/// Performs transfer of values of some properties from one instance to another.
/// </summary>
/// <param name="group">The source group.</param>
/// <exception cref="ArgumentNullException">
/// When <paramref name="group"/> is null.</exception>
public void Merge(GroupRecord group)
{
if (group == null)
throw new ArgumentNullException("group");
IsPopulated = group.IsPopulated;
if (IsPopulated)
_containsGroupItems = false;
if (!_containsGroupItems)
{
TotalItemsCount = group.TotalItemsCount;
TotalDataItemsCount = group.TotalDataItemsCount;
IsBlocked = group.IsBlocked;
}
CurrentPageNumber = group.CurrentPageNumber;
IsExpanded = group.IsExpanded;
if (IsPopulated && group._aggregateResults != null)
{
_aggregateResults = group._aggregateResults;
var groupAggregateResults = ((QueryableCollectionViewGroup)_groupInfo.Target).AggregateResults;
groupAggregateResults.Clear();
group._aggregateResults.ForEach(
r => groupAggregateResults.Add(r));
RefreshGroupFooter();
}
}
public GroupRecordPageChanged(GroupRecord record)
{
GroupRecord = record;
}
