VC 文字處理

//實現插入符打字，退格回車的思路。用的是TextOut 和DrawText設定的矩形會將字體截斷，可以結合Timer實現LRC字幕的變化效果。 

CClientDC dc(this);
   if(nChar ==0x0D)
   {
      m_cposCaret.x =0;
	  m_cposCaret.y += m_cszCharacter.cy;
	  SetCaretPos(m_cposCaret);
	  m_cstrText.Empty();
   }
   else if(nChar == 0x08)
   {
	  COLORREF color = dc.SetTextColor(dc.GetBkColor());
      dc.TextOut(m_cposCaret.x,m_cposCaret.y,m_cstrText);
      m_cstrText = m_cstrText.Left(m_cstrText.GetLength() -1);
	  CPoint posCaret;
	  posCaret.x  =m_cposCaret.x + dc.GetTextExtent(m_cstrText).cx;
	  posCaret.y = m_cposCaret.y;
	  SetCaretPos(posCaret);
	  dc.SetTextColor(color );
      dc.TextOut(m_cposCaret.x,m_cposCaret.y,m_cstrText);
   }
   else
   {
	   m_cstrText += nChar;
	   CPoint posCaret;
	   posCaret.x  =m_cposCaret.x + dc.GetTextExtent(m_cstrText).cx;
	   posCaret.y = m_cposCaret.y;
	   SetCaretPos(posCaret);
       dc.TextOut(m_cposCaret.x,m_cposCaret.y,m_cstrText);
   }