public VisualPointInfo GetTextPointInfoFromCaretPoint(int caretX)
{
int accTextRunWidth = 0;
int accTextRunCharCount = 0;
Run lastestTextRun = null;
foreach (Run t in _runs)
{
lastestTextRun = t;
int thisTextRunWidth = t.Width;
if (accTextRunWidth + thisTextRunWidth > caretX)
{
CharLocation localPointInfo = t.GetCharacterFromPixelOffset(caretX - thisTextRunWidth);
var pointInfo = new EditableVisualPointInfo(this, accTextRunCharCount + localPointInfo.RunCharIndex, t);
pointInfo.SetAdditionVisualInfo(accTextRunCharCount, caretX, accTextRunWidth);
return(pointInfo);
}
else
{
accTextRunWidth += thisTextRunWidth;
accTextRunCharCount += t.CharacterCount;
}
}
if (lastestTextRun != null)
{
return(null);
}
else
{
EditableVisualPointInfo pInfo = new EditableVisualPointInfo(this, -1, null);
pInfo.SetAdditionVisualInfo(accTextRunCharCount, caretX, accTextRunWidth);
return(pInfo);
}
}
//
/// <summary>
/// try set caret x pos to nearest request value
/// </summary>
/// <param name="xpos"></param>
public void TrySetCaretPos(int xpos, int ypos)
{
//--------
_textFlowLayer.LatestHitRun = null;
//--------
if (_currentTextRun == null)
{
caret_char_index = 0;
_caretXPos = 0;
_rCharOffset = 0;
_rPixelOffset = 0;
return;
}
int pixDiff = xpos - _caretXPos;
if (pixDiff > 0)
{
do
{
int thisTextRunPixelLength = _currentTextRun.Width;
if (_rPixelOffset + thisTextRunPixelLength > xpos)
{
CharLocation foundLocation = Run.InnerGetCharacterFromPixelOffset(_currentTextRun, xpos - _rPixelOffset);
_caretXPos = _rPixelOffset + foundLocation.pixelOffset;
caret_char_index = _rCharOffset + foundLocation.RunCharIndex;
//for solid text run
//we can send some event to it
_textFlowLayer.LatestHitRun = _currentTextRun;
//if (foundLocation.charIndex == -1)
//{
// if (!(MoveToPreviousTextRun()))
// {
// caretXPos = 0;
// caret_char_index = 0;
// }
//}
//else
//{
// caretXPos = rPixelOffset + foundLocation.pixelOffset;
// caret_char_index = rCharOffset + foundLocation.charIndex;
//}
return;
}
} while (MoveToNextTextRun());
//to the last
_caretXPos = _rPixelOffset + _currentTextRun.Width;
caret_char_index = _rCharOffset + _currentTextRun.CharacterCount;
return;
}
else if (pixDiff < 0)
{
do
{
if (xpos >= _rPixelOffset)
{
CharLocation foundLocation = Run.InnerGetCharacterFromPixelOffset(_currentTextRun, xpos - _rPixelOffset);
_caretXPos = _rPixelOffset + foundLocation.pixelOffset;
caret_char_index = _rCharOffset + foundLocation.RunCharIndex;
//for solid text run
//we can send some event to it
_textFlowLayer.LatestHitRun = _currentTextRun;
//if (foundLocation.charIndex == -1)
//{
// if (!MoveToPreviousTextRun())
// {
// caret_char_index = 0;
// caretXPos = 0;
// }
//}
//else
//{
// caretXPos = rPixelOffset + foundLocation.pixelOffset;
// caret_char_index = rCharOffset + foundLocation.RunCharIndex;
//}
return;
}
} while (MoveToPreviousTextRun());//
_caretXPos = 0;
caret_char_index = 0;
return;
}
}