如何在CRichEditView显示行号？

[快乐小兵]

现在要用MFC做一个代码文本编辑器。

现在的想法是生成一个基于CRichEditView单文档结构的程序。读入一个txt文件，有什么办法可以做一个在右边显示行号的功能？自己画？当滚动条移动的时候，如何即时更新呢?

求大牛指导。

[linxren]

只能重绘。没有别的办法~

[Eleven]

[Quote=引用楼主 wuxianbin1992 的回复:]
现在要用MFC做一个代码文本编辑器。

现在的想法是生成一个基于CRichEditView单文档结构的程序。读入一个txt文件，有什么办法可以做一个在右边显示行号的功能？自己画？当滚动条移动的时候，如何即时更新呢?

求大牛指导。
[/Quote]
可以参考Scintilla，开源的http://www.scintilla.org/

[linxren]

http://topic.csdn.net/u/20110822/11/69b9b7d4-b4e2-46e5-a2ce-d0b8a81e6179.html
这是我写的编辑器，但不是基于CRichEditView的。我是从CWnd直接重绘的。以前写过从CRichEdit来写，但是不满意。

LRESULT CExRichEdit::WndProcNew(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)  
{ 
	CExRichEdit * pWnd = NULL;
	pWnd = (CExRichEdit *)CWnd::FromHandlePermanent( hWnd );
	if( pWnd == NULL ){
		return 0;
	}
	if( !(pWnd->m_Style & EX_RICHEDIT_LN) )
	{
		return CallWindowProc(pWnd->WndProcOld, hWnd, uMsg, wParam, lParam);  
	}
	if( uMsg == WM_PAINT )
	{
		CallWindowProc(pWnd->WndProcOld, hWnd, uMsg, wParam, lParam); 

		HDC hDC = ::GetDC( hWnd );
		CDC * pDC = new CDC;
		pDC->Attach( hDC );
		pDC->SetBkMode(TRANSPARENT);
//------------------------------------------------------------------------------------------------------
		CDC MemDC;
		CRect rect;
		CBitmap  m_Canvas;
		pWnd->GetClientRect(&rect);
		MemDC.CreateCompatibleDC(pDC);
		m_Canvas.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
		MemDC.SelectObject(&m_Canvas);
		MemDC.SetBkMode(TRANSPARENT);
//-------------------------------------------------------------------------------------------------------------
		CRgn rgn2;
		rgn2.CreateRectRgn( rect.left, rect.top, rect.left+pWnd->m_nweigth, rect.bottom );
		MemDC.SelectClipRgn(&rgn2);						// 裁剪边框

		CRgn rgn1;
		rgn1.CreateRectRgn( rect.left+pWnd->m_nweigth, rect.top, rect.right, rect.bottom );
//		pWnd->RedrawWindow(0, &rgn1, RDW_INVALIDATE);
		
		LOGFONT lf; 
		HFONT   hFont,oldFont;

		GetObject(GetStockObject(SYSTEM_FONT), sizeof(LOGFONT), &lf);          
		lf.lfHeight = -pWnd->m_cf.yHeight/15;
		lf.lfWidth = 7;
		lf.lfWeight = 300;
		wsprintf( lf.lfFaceName, _T("%s"), _T("隶书") );
		hFont = CreateFont(lf.lfHeight, lf.lfWidth, 
			lf.lfEscapement, lf.lfOrientation, lf.lfWeight, 
			lf.lfItalic, lf.lfUnderline, lf.lfStrikeOut, lf.lfCharSet, 
			lf.lfOutPrecision, lf.lfClipPrecision, lf.lfQuality, 
			lf.lfPitchAndFamily, lf.lfFaceName); 
		oldFont = (HFONT)pDC->SelectObject( hFont );	// 设置字体

		CBrush	BrushOver;
		BrushOver.CreateSolidBrush( pWnd->m_nbclr );	// 行号底色底色
		rect.right = pWnd->m_nweigth-7;
		MemDC.FillRect( &rect, &BrushOver );

		CPen PenLine;
		PenLine.CreatePen(PS_INSIDEFRAME | PS_DOT, 1, pWnd->m_nclr); 
		pDC->SelectObject( &PenLine );
		pDC->MoveTo( rect.right, rect.top);
		pDC->LineTo( rect.right, rect.bottom);
		BrushOver.DeleteObject();
		PenLine.DeleteObject();

		long s,e;
		pWnd->GetSel( s,e);
		CPoint pt, sPt, ePt;
		COLORREF colorref = RGB( 255, 255, 255 );
		colorref ^= pWnd->m_nclr;						// 与背景色异或
		int nSNum = pWnd->GetFirstVisibleLine();		// 可显第一行
		int nLNum = pWnd->GetLineCount();				// 总行数
		int nLVis = nLNum - nSNum;
		CString sLNum;
		for( int i=0; i<nLVis; i++)
		{
			sPt = pWnd->PosFromChar( s );
			ePt = pWnd->PosFromChar( e );
			pt = pWnd->PosFromChar( pWnd->LineIndex(nSNum+i) );
			if( pt.y >= sPt.y && pt.y <= ePt.y )		MemDC.SetTextColor( colorref );				// 行号颜色
			else						MemDC.SetTextColor( pWnd->m_nclr);
			sLNum.Format( _T("%4d"), nSNum+i);
			MemDC.TextOut( 0, pt.y, sLNum , sLNum.GetLength() );	//绘制行号
		}
//-------------------------------------------------------------------------------------------------
		pDC->BitBlt(rect.left,rect.top,rect.Width(),rect.Height(),&MemDC,0,0,SRCCOPY); 

		MemDC.SelectObject( oldFont );
		DeleteObject( hFont );
		MemDC.DeleteDC();
		pDC->DeleteDC();
		delete pDC;
		return 0;
	}
	return   CallWindowProc(pWnd->WndProcOld, hWnd, uMsg, wParam, lParam);  
}   

void CExRichEdit::PreSubclassWindow()
{
	// TODO: 在此添加专用代码和/或调用基类
	long eventmask = GetEventMask() | ENM_PROTECTED | ENM_CHANGE;
	SetEventMask( eventmask );

	PostMessage( (UINT) EM_SETMARGINS , EC_LEFTMARGIN, (LPARAM)m_nweigth  );  
	WndProcOld = (WNDPROC)SetWindowLong(this->GetSafeHwnd(), GWL_WNDPROC,  (LONG)WndProcNew); 

	SetBackgroundColor( 0, m_bclr);
	ExSetFont( m_cf );

//	this->SetSel(charrange &cr );

	CRichEditCtrl::PreSubclassWindow();
}

[黑桃_杰克]

标记下，同问