void ISourceItemChangeProcessor.ProcessSourceItemChange(ExpressionWatcher expressionWatcher)
{
int index = expressionWatcher._position.Index;
FilteringUtils.ProcessChangeSourceItem(index, _sourceAsList[index], _itemInfos, this,
_filteredPositions, this);
}
private void unregisterSourceItem(int sourceIndex)
{
int?removeIndex = null;
FilteringItemInfo itemInfo = _itemInfos[sourceIndex];
Utils.disposeExpressionWatcher(itemInfo.ExpressionWatcher, itemInfo.NestedComputings, this,
_predicateContainsParametrizedObservableComputationsCalls);
Position itemInfoFilteredPosition = itemInfo.FilteredPosition;
if (itemInfoFilteredPosition != null)
{
removeIndex = itemInfoFilteredPosition.Index;
_filteredPositions.Remove(itemInfoFilteredPosition.Index);
FilteringUtils.modifyNextFilteredItemIndex(sourceIndex, itemInfo.NextFilteredItemPosition, _itemInfos);
}
_sourcePositions.Remove(sourceIndex);
if (removeIndex.HasValue)
{
baseRemoveItem(removeIndex.Value);
}
}
void ISourceCollectionChangeProcessor.processSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
int newSourceIndex = e.NewStartingIndex;
TSourceItem addedSourceItem = (TSourceItem)e.NewItems[0];
Position newItemPosition = null;
Position nextItemPosition;
int?newFilteredIndex = null;
Utils.getItemInfoContent(
new object[] { addedSourceItem },
out ExpressionWatcher newWatcher,
out Func <bool> newPredicateFunc,
out List <IComputingInternal> nestedComputings,
_predicateExpression,
out _predicateExpressionCallCount,
this,
_predicateContainsParametrizedObservableComputationsCalls,
_predicateExpressionInfo);
bool predicateValue = _thisAsFiltering.applyPredicate(addedSourceItem, newPredicateFunc);
nextItemPosition = FilteringUtils.processAddSourceItem(newSourceIndex, predicateValue, ref newItemPosition,
ref newFilteredIndex, _itemInfos, _filteredPositions, Count);
registerSourceItem(addedSourceItem, newSourceIndex, newItemPosition, nextItemPosition, newWatcher,
newPredicateFunc, nestedComputings);
if (newFilteredIndex != null)
{
baseInsertItem(newFilteredIndex.Value, addedSourceItem);
}
break;
case NotifyCollectionChangedAction.Remove:
unregisterSourceItem(e.OldStartingIndex);
break;
case NotifyCollectionChangedAction.Move:
FilteringUtils.ProcessMoveSourceItems(e.OldStartingIndex, e.NewStartingIndex, _itemInfos,
_filteredPositions, _sourcePositions, this);
break;
case NotifyCollectionChangedAction.Reset:
processSource();
break;
case NotifyCollectionChangedAction.Replace:
int sourceIndex = e.NewStartingIndex;
TSourceItem replacingSourceItem = (TSourceItem)e.NewItems[0];
FilteringItemInfo replacingItemInfo = _itemInfos[sourceIndex];
bool replace = FilteringUtils.ProcessReplaceSourceItem(replacingItemInfo, replacingSourceItem,
new object[] { replacingSourceItem },
sourceIndex, _predicateContainsParametrizedObservableComputationsCalls, _predicateExpression,
out _predicateExpressionCallCount, _predicateExpressionInfo, _itemInfos, _filteredPositions,
_thisAsFiltering, this);
if (replace)
{
baseSetItem(replacingItemInfo.FilteredPosition.Index, replacingSourceItem);
}
break;
}
}
