private void SetReadOnlyRegionType(ReadOnlyRegionType value)
{
ITextBuffer buffer = WpfTextView.TextBuffer;
ITextSnapshot snapshot = buffer.CurrentSnapshot;
using (IReadOnlyRegionEdit edit = buffer.CreateReadOnlyRegionEdit()) {
edit.ClearReadOnlyRegion(ref _readOnlyRegionBegin);
edit.ClearReadOnlyRegion(ref _readOnlyRegionBody);
switch (value)
{
case ReadOnlyRegionType.BeginAndBody:
if (snapshot.Length > 0)
{
_readOnlyRegionBegin = edit.CreateReadOnlyRegion(new Span(0, 0), SpanTrackingMode.EdgeExclusive, EdgeInsertionMode.Deny);
_readOnlyRegionBody = edit.CreateReadOnlyRegion(new Span(0, snapshot.Length));
}
break;
case ReadOnlyRegionType.All:
_readOnlyRegionBody = edit.CreateReadOnlyRegion(new Span(0, snapshot.Length), SpanTrackingMode.EdgeExclusive, EdgeInsertionMode.Deny);
break;
}
edit.Apply();
}
}
/// <summary>
/// Removes a ReadOnlyRegion and clears the reference (set to null).
/// </summary>
public static void ClearReadOnlyRegion(this IReadOnlyRegionEdit readOnlyRegionEdit, ref IReadOnlyRegion readOnlyRegion)
{
if (readOnlyRegion != null)
{
readOnlyRegionEdit.RemoveReadOnlyRegion(readOnlyRegion);
readOnlyRegion = null;
}
}
