internal TextContentChangedEventArgs ApplyReload(StringRebuilder newContent, EditOptions editOptions, object editTag)
{
// we construct a normalized change list where the inserted text is a reference string that
// points "forward" to the next snapshot and whose deleted text is a reference string that points
// "backward" to the prior snapshot. This pins both snapshots in memory but that's better than materializing
// giant strings, and when (?) we have paging text storage, memory requirements will be minimal.
ITextSnapshot oldSnapshot = this.currentSnapshot;
StringRebuilder oldContent = BufferFactoryService.StringRebuilderFromSnapshotSpan(new SnapshotSpan(oldSnapshot, 0, oldSnapshot.Length));
TextChange change = TextChange.Create(oldPosition: 0,
oldText: oldContent,
newText: newContent,
currentSnapshot: oldSnapshot);
TextVersion newVersion = this.currentVersion.CreateNext(changes: null, newLength: newContent.Length, reiteratedVersionNumber: -1);
TextSnapshot newSnapshot = new TextSnapshot(this, newVersion, newContent);
this.currentVersion.SetChanges(NormalizedTextChangeCollection.Create(new TextChange[] { change },
editOptions.ComputeMinimalChange
? (StringDifferenceOptions?)editOptions.DifferenceOptions
: null,
this.textDifferencingService,
oldSnapshot, newSnapshot));
this.currentVersion = newVersion;
this.builder = newContent;
this.currentSnapshot = newSnapshot;
return(new TextContentChangedEventArgs(oldSnapshot, newSnapshot, editOptions, editTag));
}
public static ChangeString CreateChangeString(IList <SnapshotSpan> sourceSpans, Span selected)
{
if (selected.Length == 0)
{
return(ChangeString.EmptyChangeString);
}
else if (selected.Length == 1)
{
return(ReferenceChangeString.CreateChangeString(sourceSpans[selected.Start]));
}
else
{
StringRebuilder builder = SimpleStringRebuilder.Create(String.Empty);
for (int i = 0; (i < selected.Length); ++i)
{
builder = builder.Insert(builder.Length, BufferFactoryService.StringRebuilderFromSnapshotSpan(sourceSpans[selected.Start + i]));
}
return(ReferenceChangeString.CreateChangeString(builder));
}
}
public ReferenceChangeString(SnapshotSpan span)
: this(BufferFactoryService.StringRebuilderFromSnapshotSpan(span))
{
}
private StringRebuilder DeletionChangeString(Span deleteSpan)
{
return(BufferFactoryService.StringRebuilderFromSnapshotAndSpan(this.originSnapshot, deleteSpan));
}