如何得到 CRichEditView 最后一个可见行

[kenshu]

用 GetRichEditCtrl().GetFirstVisibleLine()可以得到第一个可见行,如何得到最后一个可见行?

谢谢!

[kenshu]

[Quote=引用 1 楼 的回复:]
C/C++ code

int nLine = m_edit.GetFirstVisibleLine();
CDC* pDC = m_edit.GetDC();
TEXTMETRIC tm;
VERIFY(pDC->GetTextMetrics(&tm));
m_edit.ReleaseDC(pDC);
CRect rect;
……
[/Quote]

算得好像不准,我没仔细跟(因为用了三楼的办法,可以,嘻,见谅),还是很感谢.

[kenshu]

[Quote=引用 2 楼 的回复:]
滚动条滚到底就可以吧

C/C++ code
::PostMessage(m_edit.GetSafeHwnd(), WM_VSCROLL, SB_BOTTOM, 0);
[/Quote]

我不是要滚到底,比如总共100行,我屏幕能显示50行,第一个可见行为30,我要算出79.

[kenshu]

[Quote=引用 3 楼 的回复:]
C/C++ code

//当前可见的第一行
const int nFirstVisibleLine = m_cRichEdit.GetFirstVisibleLine();
//可见的第一行的第一个字符的index
const DWORD dwCharIndex = (DWORD)m_cRichEdit.LineIndex(nFirstVisibleLi……
[/Quote]

谢谢!

[Eleven]

int nLine = m_edit.GetFirstVisibleLine();
	CDC* pDC = m_edit.GetDC();
	TEXTMETRIC tm;
	VERIFY(pDC->GetTextMetrics(&tm));
	m_edit.ReleaseDC(pDC);
	CRect rect;
	m_edit.GetWindowRect(&rect);
	int cx = tm.tmHeight;
	int nTotal = m_edit.GetLineCount()-1;
	int nCount = 0;
	CString strText(_T(""));

	nCount = rect.Height() / cx + 1 + nLine + 1;
	

	if(nLine >= nTotal)
	{
		strText.Format(_T("%d"), nTotal);
	}
	else
	{
		strText.Format(_T("%d"), nCount);
	}
	AfxMessageBox(strText);

try it

[向立天]

滚动条滚到底就可以吧

::PostMessage(m_edit.GetSafeHwnd(), WM_VSCROLL, SB_BOTTOM, 0);

[zacc]

	//当前可见的第一行
	const int nFirstVisibleLine = m_cRichEdit.GetFirstVisibleLine();
	//可见的第一行的第一个字符的index
	const DWORD dwCharIndex = (DWORD)m_cRichEdit.LineIndex(nFirstVisibleLine);
	//获取这个字符相对于richedit客户区坐上角的坐标
	const DWORD dwPos = m_cRichEdit.SendMessage(EM_POSFROMCHAR,dwCharIndex,0);
	const short nXPos = (short)LOWORD(dwPos);
	const short nYPos = (short)HIWORD(dwPos);
        
        const int nLineCount  = m_cRichEdit.GetLineCount();

       for(int i = nFirstVisibleLine ; i < nLineCount   ; i++)
       {
                 DWORD dwCurIndex = 获取第i行的第一个字符的index;
                short nCurYPos =  获取  dwCurIndex 相对于左上角的坐标;
               if(nCurYPos  > 客户区的height)
                  {
                   return 第i行不可见，第i-1行可见
                     }
                 else
                  {
                      do nothing
                  }
                    
       }