/// <summary>
/// Given a <see cref="StructureTag"/>, creates an ITextBuffer with the content to display
/// in the tooltip.
/// </summary>
protected ITextBuffer CreateElisionBufferForTagTooltip(StructureTag tag)
{
// Remove any starting whitespace.
var span = TrimLeadingWhitespace(new SnapshotSpan(tag.Snapshot, tag.CollapsedHintFormSpan));
// Trim the length if it's too long.
var shortSpan = span;
if (span.Length > MaxPreviewText)
{
shortSpan = ComputeShortSpan(span);
}
// Create an elision buffer for that span, also trimming the
// leading whitespace.
var elisionBuffer = CreateElisionBufferWithoutIndentation(shortSpan);
var finalBuffer = elisionBuffer;
// If we trimmed the length, then make a projection buffer that
// has the above elision buffer and follows it with "..."
if (span.Length != shortSpan.Length)
{
finalBuffer = CreateTrimmedProjectionBuffer(elisionBuffer);
}
return(finalBuffer);
}
internal override object?GetCollapsedHintForm(StructureTag structureTag)
{
return(new ViewHostingControl(
CreateElisionBufferView,
() => CreateElisionBufferForTagTooltip(structureTag)
));
}
private void ProcessSpans(
TaggerContext <IStructureTag> context,
SnapshotSpan snapshotSpan,
BlockStructureService outliningService,
ImmutableArray <BlockSpan> spans)
{
var snapshot = snapshotSpan.Snapshot;
spans = GetMultiLineRegions(outliningService, spans, snapshot);
foreach (var span in spans)
{
var tag = new StructureTag(this, span, snapshot);
context.AddTag(new TagSpan <IStructureTag>(span.TextSpan.ToSnapshotSpan(snapshot), tag));
}
}
internal abstract object?GetCollapsedHintForm(StructureTag structureTag);
internal override object?GetCollapsedHintForm(StructureTag structureTag)
{
return(CreateElisionBufferForTagTooltip(structureTag).CurrentSnapshot.GetText());
}