public override bool DeletePrevious()
{
ITextSnapshot snapshot = _textBuffer.AdvancedTextBuffer.CurrentSnapshot;
int previousPosition = CurrentPosition - 1;
if (previousPosition < 0)
{
return(true);
}
int index = previousPosition;
char currentCharacter = snapshot[previousPosition];
// By default VS (and many other apps) will delete only the last character
// of a combining character sequence. The one exception to this rule is
// surrogate pais which we are handling here.
if (char.GetUnicodeCategory(currentCharacter) == UnicodeCategory.Surrogate)
{
index--;
}
if (index > 0)
{
if (currentCharacter == '\n')
{
if (snapshot[previousPosition - 1] == '\r')
{
index--;
}
}
}
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, index, previousPosition - index + 1));
}
public override bool DeleteNext()
{
if (_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(AdvancedTextPoint, PositionAffinity.Successor))
{
return(PrimitivesUtilities.Delete(GetNextTextElementSpan()));
}
else
{
return(_bufferPoint.DeleteNext());
}
}
public override bool DeletePrevious()
{
SnapshotSpan previousElementSpan = GetPreviousTextElementSpan();
if ((previousElementSpan.Length > 0) &&
(_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(AdvancedTextPoint, PositionAffinity.Successor)) &&
(!_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(previousElementSpan.End - 1, PositionAffinity.Successor)))
{
// Since the previous character is not visible but the current one is, delete
// the entire previous text element span.
return(PrimitivesUtilities.Delete(previousElementSpan));
}
else
{
// Delegate to the buffer point's DeletePrevious implementation to handle deleting single
// characters. A single character should be deleted if this point and the previous one
// are both visible or both not visible.
return(_bufferPoint.DeletePrevious());
}
}
public override bool RemovePreviousIndent()
{
if (Column > 0)
{
int tabSize = _editorOptions.GetTabSize();
int previousTabStop = Column - tabSize;
if (Column % tabSize > 0)
{
previousTabStop = (Column / tabSize) * tabSize;
}
int positionToDeleteTo = CurrentPosition;
TextPoint newPoint = Clone();
for (int i = CurrentPosition - 1; newPoint.Column >= previousTabStop; i--)
{
newPoint.MoveTo(i);
string character = newPoint.GetNextCharacter();
if (!string.Equals(character, " ", StringComparison.Ordinal) && !string.Equals(character, "\t", StringComparison.Ordinal))
{
break;
}
positionToDeleteTo = i;
if (newPoint.Column == previousTabStop)
{
break;
}
}
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, Span.FromBounds(positionToDeleteTo, CurrentPosition)));
}
else
{
return(true);
}
}
public override bool DeleteNext()
{
string nextCharacter = GetNextCharacter();
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, CurrentPosition, nextCharacter.Length));
}
public override bool Delete()
{
return(PrimitivesUtilities.Delete(TextBuffer.AdvancedTextBuffer, Span.FromBounds(_startPoint.CurrentPosition, _endPoint.CurrentPosition)));
}
