private void TabSelection(bool isShiftDown)
{
ITextSelection selection = CodeEditor.Document.Selection;
ITextRange range = selection.GetClone();
int selectionStart = range.StartPosition;
range.StartOf(TextRangeUnit.Line, false);
int lineStart = range.StartPosition;
int charactersFromLineStart = selectionStart - lineStart;
int charactersOffsetFromTabSize = charactersFromLineStart % ViewModel.TabSize;
if (isShiftDown)
{
int charactersToDelete = charactersOffsetFromTabSize == 0 ? ViewModel.TabSize : charactersOffsetFromTabSize;
ITextRange deletionRange = selection.GetClone();
if (deletionRange.StartPosition > lineStart)
{
deletionRange.MoveStart(TextRangeUnit.Character, -1);
int safeCharactersToDelete;
for (safeCharactersToDelete = 0; safeCharactersToDelete < charactersToDelete && deletionRange.StartPosition >= lineStart && char.IsWhiteSpace(deletionRange.Character); safeCharactersToDelete++)
{
deletionRange.MoveStart(TextRangeUnit.Character, -1);
}
CodeEditor.Document.GetRange(selection.StartPosition, selection.StartPosition).Delete(TextRangeUnit.Character, -safeCharactersToDelete);
}
}
else
{
int charactersToAdd = ViewModel.TabSize - charactersOffsetFromTabSize;
string tabString = new string(' ', charactersToAdd);
selection.TypeText(tabString);
}
}
private void InvokeTokenSelected(ITextSelection selection)
{
if (TokenSelected == null || !TryGetTokenFromRange(selection, out var token) || token.RangeEnd != selection.EndPosition)
{
return;
}
TokenSelected.Invoke(this, new RichSuggestTokenSelectedEventArgs
{
Token = token,
Range = selection.GetClone()
});
}