public ITagger <T> CreateTagger <T>(ITextView textView, ITextBuffer buffer) where T : ITag
{
//provide highlighting only on the top buffer
if (textView.TextBuffer != buffer)
{
return(null);
}
// HighlightWordCommands.Instance.TextStructureNavigatorSelectorService = TextStructureNavigatorSelector;
ITextStructureNavigator textStructureNavigator =
TextStructureNavigatorSelector.GetTextStructureNavigator(buffer);
var tagger = new HighlightWordTagger(textView, buffer, TextSearchService, textStructureNavigator);
return(tagger as ITagger <T>);
}
/// <summary>
/// Given an IWpfTextView, find the position of the caret and report its column
/// number. The column number is 0-based
/// </summary>
/// <param name="textView">The text view containing the caret</param>
/// <returns>The column number of the caret's position. When the caret is at the
/// leftmost column, the return value is zero.</returns>
private static string GetCaretWord(IWpfTextView textView, ITextStructureNavigator textStructureNavigator)
{
var caretPosition = textView.Caret.Position;
var sourceBuffer = textView.TextBuffer;
SnapshotPoint?point = caretPosition.Point.GetPoint(sourceBuffer, caretPosition.Affinity);
if (!point.HasValue)
{
return(null);
}
var snapshotPoint = point.Value;
TextExtent word = textStructureNavigator.GetExtentOfWord(snapshotPoint);
var foundWord = true;
if (!HighlightWordTagger.WordExtentIsValid(snapshotPoint, word))
{
//Before we retry, make sure it is worthwhile
if (word.Span.Start != snapshotPoint ||
snapshotPoint == snapshotPoint.GetContainingLine().Start ||
char.IsWhiteSpace((snapshotPoint - 1).GetChar()))
{
foundWord = false;
}
else
{
// Try again, one character previous.
//If the caret is at the end of a word, pick up the word.
word = textStructureNavigator.GetExtentOfWord(snapshotPoint - 1);
//If the word still isn't valid, we're done
if (!HighlightWordTagger.WordExtentIsValid(snapshotPoint, word))
{
foundWord = false;
}
}
}
if (!foundWord)
{
return(null);
}
return(word.Span.GetText());
}
