void textView_VisualLineConstructionStarting(object sender, VisualLineConstructionStartEventArgs e)
{
IHighlighter highlighter = ((TextView)sender).Services.GetService(typeof(IHighlighter)) as IHighlighter;
if (highlighter != null)
{
// Force update of highlighting state up to the position where we start generating visual lines.
// This is necessary in case the document gets modified above the FirstLineInView so that the highlighting state changes.
// We need to detect this case and issue a redraw (through TextViewDocumentHighligher.OnHighlightStateChanged)
// before the visual line construction reuses existing lines that were built using the invalid highlighting state.
highlighter.GetSpanStack(e.FirstLineInView.LineNumber - 1);
}
}
public IEnumerable <string> GetSpanColorNamesFromLineStart(int lineNumber)
{
if (highlighter != null)
{
// delayed evaluation doesn't cause a problem here: GetSpanStack is called immediately,
// only the where/select portian is evaluated later. But that won't be a problem because the
// HighlightingSpan instance shouldn't change once it's in use.
return(from span in highlighter.GetSpanStack(lineNumber - 1)
where span.SpanColor != null && span.SpanColor.Name != null
select span.SpanColor.Name);
}
else
{
return(Enumerable.Empty <string>());
}
}
/// <inheritdoc/>
protected override void Colorize(ITextRunConstructionContext context)
{
this.lastColorizedLine = null;
base.Colorize(context);
if (this.lastColorizedLine != context.VisualLine.LastDocumentLine)
{
IHighlighter highlighter = context.TextView.Services.GetService(typeof(IHighlighter)) as IHighlighter;
if (highlighter != null)
{
// In some cases, it is possible that we didn't highlight the last document line within the visual line
// (e.g. when the line ends with a fold marker).
// But even if we didn't highlight it, we'll have to update the highlighting state for it so that the
// proof inside TextViewDocumentHighlighter.OnHighlightStateChanged holds.
highlighter.GetSpanStack(context.VisualLine.LastDocumentLine.LineNumber);
}
}
this.lastColorizedLine = null;
}
public ICSharpCode.AvalonEdit.Utils.ImmutableStack <HighlightingSpan> GetSpanStack(int lineNumber)
{
return(baseHighlighter.GetSpanStack(lineNumber));
}