internal static bool ProcessChangeSourceItem <TSourceItem>(int sourceIndex,
TSourceItem sourceItem,
List <FilteringItemInfo> filteringItemInfos,
IFiltering <TSourceItem> filtering,
Positions <Position> filteredPositions,
CollectionComputing <TSourceItem> current,
ExpressionWatcher expressionWatcher)
{
if (expressionWatcher._disposed)
{
return(false);
}
FilteringItemInfo itemInfo = filteringItemInfos[sourceIndex];
bool newPredicateValue = filtering.applyPredicate(sourceItem, itemInfo.PredicateFunc);
bool oldPredicateValue = itemInfo.FilteredPosition != null;
if (newPredicateValue != oldPredicateValue)
{
if (newPredicateValue)
{
int newIndex = itemInfo.NextFilteredItemPosition.Index;
itemInfo.FilteredPosition = filteredPositions.Insert(newIndex);
newIndex = itemInfo.FilteredPosition.Index;
modifyNextFilteredItemIndex(sourceIndex, itemInfo.FilteredPosition, filteringItemInfos);
current.baseInsertItem(newIndex, sourceItem);
return(true);
}
else // if (oldPredicaeValue)
{
int index = itemInfo.FilteredPosition.Index;
filteredPositions.Remove(index);
itemInfo.FilteredPosition = null;
modifyNextFilteredItemIndex(sourceIndex, itemInfo.NextFilteredItemPosition, filteringItemInfos);
current.baseRemoveItem(index);
return(true);
}
}
return(false);
}
internal static bool ProcessReplaceSourceItem <TExpression, TSourceItem>(
FilteringItemInfo replacingItemInfo,
TSourceItem sourceItem,
object[] sourceItems,
int sourceIndex, bool predicateContainsParametrizedObservableComputationsCalls,
Expression <TExpression> predicateExpression,
out int predicateExpressionCallCount,
ExpressionWatcher.ExpressionInfo orderingValueSelectorExpressionInfo,
List <FilteringItemInfo> filteringItemInfos,
Positions <Position> filteredPositions, IFiltering <TSourceItem> thisAsFiltering,
CollectionComputing <TSourceItem> current)
{
ExpressionWatcher oldExpressionWatcher = replacingItemInfo.ExpressionWatcher;
Utils.disposeExpressionWatcher(oldExpressionWatcher, replacingItemInfo.NestedComputings, thisAsFiltering,
predicateContainsParametrizedObservableComputationsCalls);
Utils.getItemInfoContent(
sourceItems,
out ExpressionWatcher watcher,
out Func <bool> predicateFunc,
out List <IComputingInternal> nestedComputings1,
predicateExpression,
out predicateExpressionCallCount,
thisAsFiltering,
predicateContainsParametrizedObservableComputationsCalls,
orderingValueSelectorExpressionInfo);
replacingItemInfo.PredicateFunc = predicateFunc;
watcher.ValueChanged = thisAsFiltering.expressionWatcher_OnValueChanged;
watcher._position = oldExpressionWatcher._position;
replacingItemInfo.ExpressionWatcher = watcher;
replacingItemInfo.NestedComputings = nestedComputings1;
bool replace = !ProcessChangeSourceItem(sourceIndex, sourceItem, filteringItemInfos, thisAsFiltering,
filteredPositions, current) &&
replacingItemInfo.FilteredPosition != null;
return(replace);
}
internal static void ProcessMoveSourceItems <TSourceItem1>(int oldSourceIndex, int newSourceIndex1,
List <FilteringItemInfo> filteringItemInfos, Positions <Position> filteredPositions,
Positions <FilteringItemInfo> sourcePositions, CollectionComputing <TSourceItem1> current)
{
if (newSourceIndex1 != oldSourceIndex)
{
FilteringItemInfo itemInfoOfOldSourceIndex = filteringItemInfos[oldSourceIndex];
FilteringItemInfo itemInfoOfNewSourceIndex = filteringItemInfos[newSourceIndex1];
Position nextPosition1;
Position itemInfoOfOldSourceIndexFilteredPosition = itemInfoOfOldSourceIndex.FilteredPosition;
Position itemInfoOfNewSourceIndexNextFilteredItemPosition = itemInfoOfNewSourceIndex.NextFilteredItemPosition;
Position itemInfoOfNewSourceIndexFilteredPosition = itemInfoOfNewSourceIndex.FilteredPosition;
if (itemInfoOfOldSourceIndexFilteredPosition != null)
{
int oldFilteredIndex = itemInfoOfOldSourceIndexFilteredPosition.Index;
int newFilteredIndex1;
Position newPosition1 = itemInfoOfOldSourceIndexFilteredPosition;
if (itemInfoOfNewSourceIndexFilteredPosition == null)
{
//nextPositionIndex = itemInfoOfNewSourceIndex.NextFilteredItemIndex;
nextPosition1 =
itemInfoOfNewSourceIndexNextFilteredItemPosition != itemInfoOfOldSourceIndexFilteredPosition
? itemInfoOfNewSourceIndexNextFilteredItemPosition
: itemInfoOfOldSourceIndex.NextFilteredItemPosition;
newFilteredIndex1 = oldSourceIndex < newSourceIndex1
? itemInfoOfNewSourceIndexNextFilteredItemPosition.Index - 1
: itemInfoOfNewSourceIndexNextFilteredItemPosition.Index;
}
else
{
nextPosition1 = oldSourceIndex < newSourceIndex1
? itemInfoOfNewSourceIndexNextFilteredItemPosition
: itemInfoOfNewSourceIndexFilteredPosition;
newFilteredIndex1 = itemInfoOfNewSourceIndexFilteredPosition.Index;
}
filteredPositions.Move(
oldFilteredIndex,
newFilteredIndex1);
modifyNextFilteredItemIndex(oldSourceIndex,
itemInfoOfOldSourceIndex.NextFilteredItemPosition, filteringItemInfos);
sourcePositions.Move(oldSourceIndex, newSourceIndex1);
itemInfoOfOldSourceIndex.NextFilteredItemPosition = nextPosition1;
modifyNextFilteredItemIndex(newSourceIndex1, newPosition1, filteringItemInfos);
current.baseMoveItem(oldFilteredIndex, newFilteredIndex1);
}
else
{
nextPosition1 = oldSourceIndex < newSourceIndex1
? itemInfoOfNewSourceIndexNextFilteredItemPosition
: (itemInfoOfNewSourceIndexFilteredPosition ?? itemInfoOfNewSourceIndexNextFilteredItemPosition);
itemInfoOfOldSourceIndex.NextFilteredItemPosition = nextPosition1;
sourcePositions.Move(oldSourceIndex, newSourceIndex1);
}
}
}