private ElisionSourceSpansChangedEventArgs ApplySpanChanges(NormalizedSpanCollection spansToElide, NormalizedSpanCollection spansToExpand)
{
ElisionSnapshot beforeSnapshot = this.currentElisionSnapshot;
FrugalList <TextChange> textChanges;
ElisionMap newContent = this.content.EditSpans(this.sourceSnapshot, spansToElide, spansToExpand, out textChanges);
if (newContent != this.content)
{
this.content = newContent;
INormalizedTextChangeCollection normalizedChanges = NormalizedTextChangeCollection.Create(textChanges);
SetCurrentVersionAndSnapshot(normalizedChanges);
return(new ElisionSourceSpansChangedEventArgs(beforeSnapshot, this.currentElisionSnapshot,
spansToElide, spansToExpand, null));
}
else
{
return(null);
}
}
private void ConstructChanges()
{
var diffs = differ.GetDifferences();
List <TextChange> changes = new List <TextChange>();
int pos = this.textPosition;
// each difference generates a text change
foreach (Difference diff in diffs)
{
pos += GetMatchSize(diffs.LeftSequence, diff.Before);
TextChange change = TextChange.Create(pos,
BufferFactoryService.StringRebuilderFromSnapshotSpans(diffs.LeftSequence, diff.Left),
BufferFactoryService.StringRebuilderFromSnapshotSpans(diffs.RightSequence, diff.Right),
this.currentSnapshot);
changes.Add(change);
pos += change.OldLength;
}
this.normalizedChanges = NormalizedTextChangeCollection.Create(changes);
}
private void ConstructChanges()
{
IDifferenceCollection <SnapshotSpan> diffs = differ.GetDifferences();
List <TextChange> changes = new List <TextChange>();
int pos = this.textPosition;
// each difference generates a text change
foreach (Difference diff in diffs)
{
pos += GetMatchSize(differ.DeletedSpans, diff.Before);
TextChange change = new TextChange(pos,
ReferenceChangeString.CreateChangeString(differ.DeletedSpans, diff.Left),
ReferenceChangeString.CreateChangeString(differ.InsertedSpans, diff.Right),
this.currentSnapshot);
changes.Add(change);
pos += change.OldLength;
}
this.normalizedChanges = NormalizedTextChangeCollection.Create(changes);
}
private TextContentChangedEventRaiser IncorporateChanges()
{
Debug.Assert(this.sourceSnapshot == this.pendingContentChangedEventArgs[0].Before);
FrugalList <TextChange> projectedChanges = new FrugalList <TextChange>();
var args0 = this.pendingContentChangedEventArgs[0];
INormalizedTextChangeCollection sourceChanges;
// Separate the easy and common case:
if (this.pendingContentChangedEventArgs.Count == 1)
{
sourceChanges = args0.Changes;
this.sourceSnapshot = args0.After;
}
else
{
// there is more than one snapshot of the source buffer to deal with. Since the changes may be
// interleaved by position, we need to get a normalized list in sequence. First we denormalize the
// changes so they are all relative to the same single starting snapshot, then we normalize them again into
// a single list.
// This relies crucially on the fact that we know something about the multiple snapshots: they were
// induced by projection span adjustments, and the changes across them are independent. That is to say,
// it is not the case that text inserted in one snapshot is deleted in a later snapshot in the series.
DumpPendingContentChangedEventArgs();
List <TextChange> denormalizedChanges = new List <TextChange>()
{
new TextChange(int.MaxValue, StringRebuilder.Empty, StringRebuilder.Empty, LineBreakBoundaryConditions.None)
};
for (int a = 0; a < this.pendingContentChangedEventArgs.Count; ++a)
{
NormalizedTextChangeCollection.Denormalize(this.pendingContentChangedEventArgs[a].Changes, denormalizedChanges);
}
DumpPendingChanges(new List <Tuple <ITextBuffer, List <TextChange> > >()
{
new Tuple <ITextBuffer, List <TextChange> >(this.sourceBuffer, denormalizedChanges)
});
FrugalList <TextChange> slicedChanges = new FrugalList <TextChange>();
// remove the sentinel
for (int d = 0; d < denormalizedChanges.Count - 1; ++d)
{
slicedChanges.Add(denormalizedChanges[d]);
}
sourceChanges = NormalizedTextChangeCollection.Create(slicedChanges);
this.sourceSnapshot = this.pendingContentChangedEventArgs[this.pendingContentChangedEventArgs.Count - 1].After;
}
if (sourceChanges.Count > 0)
{
this.content = this.content.IncorporateChanges(sourceChanges, projectedChanges, args0.Before, this.sourceSnapshot, this.currentElisionSnapshot);
}
this.pendingContentChangedEventArgs.Clear();
ElisionSnapshot beforeSnapshot = this.currentElisionSnapshot;
SetCurrentVersionAndSnapshot(NormalizedTextChangeCollection.Create(projectedChanges));
this.editApplicationInProgress = false;
return(new TextContentChangedEventRaiser(beforeSnapshot, this.currentElisionSnapshot, args0.Options, args0.EditTag));
}
