public bool Highlight(Range range, bool highlight)
{
ThreadHelper.ThrowIfNotOnUIThread();
if (!highlight)
{
_highlightAdornmentLayer.RemoveAllAdornments();
return(false);
}
CreateLineInfos(_textView, _textView.TextViewLines);
try {
var brush = CreateBrush();
range = range.Normalize();
var lineStart = range.Start.Line;
var lineEnd = range.End.Line;
for (var i = range.Start.Line; i <= range.End.Line; i++)
{
var isInnerOrLastLine = i > range.Start.Line && i <= range.End.Line;
if (!_lineInfos.TryGetValue(i, out ITextViewLine lineInfo))
{
if (Log.IsVerboseEnabled())
{
try {
var visible = _textView.TextViewLines.AsQueryable().Select(_ =>
_textView.TextSnapshot.GetLineNumberFromPosition(_.Extent.Start.Position)
).ToList();
if (visible.Count() >= 1)
{
Log.Verbose($"Could not find lineInfo for line={i}, only lines {visible.First()}-{visible.Last()} are visible");
}
}
catch (Exception ex) {
Log.Verbose(ex, $"Problem with logging message for line={i}");
}
}
continue;
}
Placement placement;
if (lineStart == lineEnd)
{
//single line
var length = range.End.Character == int.MaxValue
? lineInfo.Extent.End.Position - lineInfo.Extent.Start.Position
: range.End.Character - range.Start.Character;
if (length == 0)
{
//highlight whole line
placement = new Placement(_textView.ViewportLeft, _textView.ViewportWidth);
}
else
{
placement = _textView
.GetGeometryPlacement(new SnapshotSpan(lineInfo.Extent.Snapshot,
new Span(lineInfo.Extent.Start + range.Start.Character, length)));
}
}
else
{
if (i == lineStart)
{
var startPosition = range.Start.Character + lineInfo.Extent.Start;
var endLength = startPosition >= lineInfo.Extent.End.Position
? 1
: lineInfo.Extent.End.Position - Math.Max(startPosition, 0);
placement = _textView
.GetGeometryPlacement(new SnapshotSpan(lineInfo.Extent.Snapshot,
new Span(startPosition, endLength)));
}
else if (i == lineEnd)
{
var endLength = range.End.Character == int.MaxValue
? lineInfo.Extent.End.Position - lineInfo.Extent.Start.Position
: range.End.Character;
placement = _textView
.GetGeometryPlacement(new SnapshotSpan(lineInfo.Extent.Snapshot,
new Span(lineInfo.Extent.Start, endLength)));
}
else
{
// some middle line
placement = _textView.GetGeometryPlacement(lineInfo.Extent);
}
}
var rectangleHeight = lineInfo.TextHeight + 1.35; //buffer ;)
if (lineInfo.Height > rectangleHeight)
{
// height _might_ be taller than line height because of codelenses
if (isInnerOrLastLine)
{
rectangleHeight = lineInfo.Height + 0.5; //buffer :)
}
}
var element = new Rectangle {
Height = rectangleHeight,
Width = placement.Width,
Fill = brush
};
Canvas.SetLeft(element, range.Start.Character == 0 ? (int)_textView.ViewportLeft : placement.Left);
Canvas.SetTop(element, isInnerOrLastLine ? lineInfo.Top : lineInfo.TextTop);
_highlightAdornmentLayer.AddAdornment(lineInfo.Extent, null, element);
}
return(true);
}
catch (ArgumentException ex) {
Log.Debug(ex, $"{range?.ToJson()}");
}
catch (Exception ex) {
Log.Warning(ex, $"{range?.ToJson()}");
}
return(false);
}