private static int FindNextWhitespaceBackward(RichTextBox edit)
{
TextPointer pointer = edit.CaretPosition;
WordParser parser = new WordParser("", LogicalDirection.Backward);
int resOffset = -1;
while (pointer != null)
{
string textInRun = pointer.GetTextInRun(LogicalDirection.Backward);
if (textInRun != "")
{
parser.Text = textInRun;
int res = parser.FindNextWhitespace();
if (res != -1)
{
resOffset = edit.Document.ContentStart.GetOffsetToPosition(pointer) - res + 1;
break;
}
}
pointer = pointer.GetNextContextPosition(LogicalDirection.Backward);
}
if (pointer == null)
{
resOffset = 0;
}
return(resOffset);
}
private TextRange SelectCurrentWord(RichTextBox edit)
{
TextPointer pointer = edit.CaretPosition;
TextPointer wordEnd = edit.CaretPosition;
TextPointer wordStart = edit.CaretPosition;
// Ищем вперед
pointer = wordEnd;
bool wSpaceFound = false;
while (pointer != null)
{
string nextText = pointer.GetTextInRun(LogicalDirection.Forward);
if (nextText != "")
{
for (int i = 0; i < nextText.Length; i++)
{
if (WordParser.IsAlphanumeric(nextText[i]) || WordParser.IsWhitespace(nextText[i]))
{
wordEnd = pointer.GetPositionAtOffset(i, LogicalDirection.Forward);
wSpaceFound = true;
break;
}
}
if (wSpaceFound)
{
break;
}
else
{
wordEnd = pointer.GetPositionAtOffset(nextText.Length);
}
}
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward);
}
// ищем назад
pointer = wordStart;
wSpaceFound = false;
while (pointer != null)
{
string prevText = pointer.GetTextInRun(LogicalDirection.Backward);
if (prevText != "")
{
for (int i = prevText.Length - 1; i >= 0; i--)
{
if (WordParser.IsAlphanumeric(prevText[i]) || WordParser.IsWhitespace(prevText[i]))
{
wordStart = pointer.GetPositionAtOffset(-(prevText.Length - i) + 1);
wSpaceFound = true;
break;
}
}
if (wSpaceFound)
{
break;
}
}
TextPointer lastPointer = pointer;
pointer = pointer.GetNextContextPosition(LogicalDirection.Backward);
if (pointer == null)
{
wordStart = lastPointer;
}
}
return(new TextRange(wordStart, wordEnd));
}
private static int FindNextWhitespaceForward(RichTextBox edit)
{
TextPointer pointer = edit.CaretPosition;
WordParser parser = null;
int resOffset = -1;
while (pointer != null)
{
string textInRun = pointer.GetTextInRun(LogicalDirection.Forward);
if (textInRun != "")
{
if (parser == null)
parser = new WordParser(textInRun, LogicalDirection.Forward);
else
parser.Text = textInRun;
int res = parser.FindNextWhitespace();
if (res != -1)
{
resOffset = edit.Document.ContentStart.GetOffsetToPosition(pointer) + res;
break;
}
}
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward);
}
if (pointer == null)
resOffset = edit.Document.ContentStart.GetOffsetToPosition(edit.Document.ContentEnd);
return resOffset;
}