public float GetXOffsetAtCharIndex(int charIndex)
{
float xoffset = 0;
int acc_charCount = 0;
Run r = this.FirstRun;
while (r != null)
{
if (r.CharacterCount + acc_charCount >= charIndex)
{
//found at this run
return(xoffset + r.GetRunWidth(charIndex - acc_charCount));
}
xoffset += r.Width;
acc_charCount += r.CharacterCount;
r = r.NextRun;
}
//foreach (Run r in _runs)
//{
// if (r.CharacterCount + acc_charCount >= charIndex)
// {
// //found at this run
// return xoffset + r.GetRunWidth(charIndex - acc_charCount);
// }
// xoffset += r.Width;
// acc_charCount += r.CharacterCount;
//}
return(0);//?
}
public EditableVisualPointInfo GetTextPointInfoFromCharIndex(int charIndex)
{
int limit = CharCount() - 1;
if (charIndex > limit)
{
charIndex = limit;
}
int rCharOffset = 0;
int rPixelOffset = 0;
Run lastestRun = null;
EditableVisualPointInfo textPointInfo = null;
foreach (Run r in _runs)
{
lastestRun = r;
int thisCharCount = lastestRun.CharacterCount;
if (thisCharCount + rCharOffset > charIndex)
{
int localCharOffset = charIndex - rCharOffset;
int pixelOffset = lastestRun.GetRunWidth(localCharOffset);
textPointInfo = new EditableVisualPointInfo(this, charIndex, lastestRun);
textPointInfo.SetAdditionVisualInfo(localCharOffset, rPixelOffset + pixelOffset, rPixelOffset);
return(textPointInfo);
}
else
{
rCharOffset += thisCharCount;
rPixelOffset += r.Width;
}
}
textPointInfo = new EditableVisualPointInfo(this, charIndex, lastestRun);
textPointInfo.SetAdditionVisualInfo(rCharOffset - lastestRun.CharacterCount, rPixelOffset, rPixelOffset - lastestRun.Width);
return(textPointInfo);
}
bool MoveToNextTextRun()
{
//#if DEBUG
// if (_currentTextRun.IsLineBreak)
// {
// throw new NotSupportedException();
// }
//#endif
Run nextTextRun = _currentTextRun.NextRun;
if (nextTextRun != null)// && !nextTextRun.IsLineBreak)
{
_rCharOffset += _currentTextRun.CharacterCount;
_rPixelOffset += _currentTextRun.Width;
_currentTextRun = nextTextRun;
caret_char_index = _rCharOffset;
_caretXPos = _rPixelOffset + _currentTextRun.GetRunWidth(0);
return(true);
}
return(false);
}
public void SetCurrentCharIndex(int newCharIndexPointTo)
{
#if DEBUG
if (dbugTextManRecorder != null)
{
dbugTextManRecorder.WriteInfo("TextLineReader::CharIndex_set=" + newCharIndexPointTo);
dbugTextManRecorder.BeginContext();
}
#endif
if (newCharIndexPointTo < 0 || newCharIndexPointTo > _currentLine.CharCount())
{
throw new NotSupportedException("index out of range");
}
if (newCharIndexPointTo == 0)
{
caret_char_index = 0;
_caretXPos = 0;
_rCharOffset = 0;
_rPixelOffset = 0;
_currentTextRun = _currentLine.FirstRun;
}
else
{
int diff = newCharIndexPointTo - caret_char_index;
switch (diff)
{
case 0:
{
return;
}
default:
{
if (diff > 0)
{
do
{
if (_rCharOffset + _currentTextRun.CharacterCount >= newCharIndexPointTo)
{
caret_char_index = newCharIndexPointTo;
_caretXPos = _rPixelOffset + _currentTextRun.GetRunWidth(caret_char_index - _rCharOffset);
#if DEBUG
if (dbugTextManRecorder != null)
{
dbugTextManRecorder.EndContext();
}
#endif
return;
}
//
} while (MoveToNextTextRun());
caret_char_index = _rCharOffset + _currentTextRun.CharacterCount;
_caretXPos = _rPixelOffset + _currentTextRun.Width;
return;
}
else
{
do
{
if (_rCharOffset - 1 < newCharIndexPointTo)
{
caret_char_index = newCharIndexPointTo;
_caretXPos = _rPixelOffset + _currentTextRun.GetRunWidth(caret_char_index - _rCharOffset);
#if DEBUG
if (dbugTextManRecorder != null)
{
dbugTextManRecorder.EndContext();
}
#endif
return;
}
} while (MoveToPreviousTextRun());
caret_char_index = 0;
_caretXPos = 0;
}
}
break;
}
}
#if DEBUG
if (dbugTextManRecorder != null)
{
dbugTextManRecorder.EndContext();
}
#endif
}