protected override ITextSnapshot PerformApply()
{
CheckActive();
this.applied = true;
if ((this.readOnlyRegionsToAdd.Count > 0) || (this.readOnlyRegionsToRemove.Count > 0))
{
if (this.readOnlyRegionsToAdd.Count > 0)
{
// We leave the read only regions collection on the buffer null
// since most buffers will never have a read only region. Since
// regions are being added, create it now.
if (this.baseBuffer.readOnlyRegions == null)
{
this.baseBuffer.readOnlyRegions = new FrugalList <IReadOnlyRegion>();
}
this.baseBuffer.readOnlyRegions.AddRange(this.readOnlyRegionsToAdd);
}
if (this.readOnlyRegionsToRemove.Count > 0)
{
// We've already verified that it makes sense to remove these read only
// regions, so just proceed without further checks.
foreach (IReadOnlyRegion readOnlyRegion in this.readOnlyRegionsToRemove)
{
this.baseBuffer.readOnlyRegions.Remove(readOnlyRegion);
}
}
// Save off the current state of the read only spans
this.baseBuffer.readOnlyRegionSpanCollection = new ReadOnlySpanCollection(this.baseBuffer.CurrentVersion, this.baseBuffer.readOnlyRegions);
ReadOnlyRegionsChangedEventRaiser raiser =
new ReadOnlyRegionsChangedEventRaiser(new SnapshotSpan(this.baseBuffer.CurrentSnapshot, this.aggregateStart, this.aggregateEnd - this.aggregateStart));
this.baseBuffer.group.EnqueueEvents(raiser, this.baseBuffer);
// no immediate event for read only regions
this.baseBuffer.editInProgress = false;
}
else
{
this.baseBuffer.editInProgress = false;
}
// no new snapshot
return(this.originSnapshot);
}
internal virtual void OnSourceBufferReadOnlyRegionsChanged(object sender, SnapshotSpanEventArgs e)
{
NormalizedSpanCollection mappedAffectedSpans = new NormalizedSpanCollection(this.CurrentBaseSnapshot.MapFromSourceSnapshot(e.Span));
if (mappedAffectedSpans.Count > 0)
{
ITextEventRaiser raiser =
new ReadOnlyRegionsChangedEventRaiser(new SnapshotSpan(this.currentSnapshot,
Span.FromBounds(mappedAffectedSpans[0].Start,
mappedAffectedSpans[mappedAffectedSpans.Count - 1].End)));
this.group.BeginEdit();
this.group.EnqueueEvents(raiser, this);
this.group.FinishEdit();
}
}
