public NormalizedSnapshotSpanCollection CloneAndTrackTo(ITextSnapshot targetSnapshot, SpanTrackingMode mode)
{
if (targetSnapshot == null)
{
throw new ArgumentNullException(nameof(targetSnapshot));
}
if (mode < SpanTrackingMode.EdgeExclusive || mode > SpanTrackingMode.Custom)
{
throw new ArgumentOutOfRangeException(nameof(mode));
}
if (this.snapshot == null)
{
return(NormalizedSnapshotSpanCollection.Empty);
}
else if (targetSnapshot.TextBuffer != this.snapshot.TextBuffer)
{
throw new ArgumentException("this.Snapshot and targetSnapshot must be from the same ITextBuffer");
}
else if (this.snapshot == targetSnapshot)
{
return(this);
}
else if (this.spans == null)
{
Span targetSpan = targetSnapshot.Version.VersionNumber > this.snapshot.Version.VersionNumber
? Tracking.TrackSpanForwardInTime(mode, this.span, this.snapshot.Version, targetSnapshot.Version)
: Tracking.TrackSpanBackwardInTime(mode, this.span, this.snapshot.Version, targetSnapshot.Version);
return(new NormalizedSnapshotSpanCollection(targetSnapshot, targetSpan));
}
else
{
var targetSpans = new Span[this.spans.Count];
for (int i = 0; (i < this.spans.Count); ++i)
{
targetSpans[i] = targetSnapshot.Version.VersionNumber > this.snapshot.Version.VersionNumber
? Tracking.TrackSpanForwardInTime(mode, this.spans[i], this.snapshot.Version, targetSnapshot.Version)
: Tracking.TrackSpanBackwardInTime(mode, this.spans[i], this.snapshot.Version, targetSnapshot.Version);
}
return(new NormalizedSnapshotSpanCollection(targetSnapshot, targetSpans));
}
}
/// <summary>
/// Translates this snapshot span to a different snapshot of the same <see cref="ITextBuffer"/>.
/// </summary>
/// <param name="targetSnapshot">The snapshot to which to translate.</param>
/// <param name="spanTrackingMode">The <see cref="SpanTrackingMode"/> to use in the translation.</param>
/// <returns>A new snapshot span.</returns>
/// <exception cref="ArgumentNullException"><paramref name="targetSnapshot"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="targetSnapshot"/> does not refer to the same <see cref="ITextBuffer"/> as this snapshot span.</exception>
public SnapshotSpan TranslateTo(ITextSnapshot targetSnapshot, SpanTrackingMode spanTrackingMode)
{
if (targetSnapshot == this.Snapshot)
{
return(this);
}
else
{
if (targetSnapshot == null)
{
throw new ArgumentNullException("targetSnapshot");
}
if (targetSnapshot.TextBuffer != this.Start.Snapshot.TextBuffer)
{
throw new ArgumentException(Strings.InvalidSnapshot);
}
Span targetSpan = targetSnapshot.Version.VersionNumber > this.Snapshot.Version.VersionNumber
? Tracking.TrackSpanForwardInTime(spanTrackingMode, Span, this.Snapshot.Version, targetSnapshot.Version)
: Tracking.TrackSpanBackwardInTime(spanTrackingMode, Span, this.Snapshot.Version, targetSnapshot.Version);
return(new SnapshotSpan(targetSnapshot, targetSpan));
}
}