CListCtrl 防止闪烁，调整行显示长度

1，设置重绘

 2，新建类，继承CListCtrl

#pragma once
#include "afxcmn.h"

class DBufferListCtrl :
    public CListCtrl
{
public:
    DBufferListCtrl(void);
    ~DBufferListCtrl(void);


    DECLARE_MESSAGE_MAP()
    afx_msg void OnPaint();
    afx_msg BOOL OnEraseBkgnd(CDC* pDC);


    CString GetItemText(int nItem, int nSubItem) const;

    virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);
};

#include "stdafx.h"
#include "DBufferListCtrl.h"


DBufferListCtrl::DBufferListCtrl(void)
{
}


DBufferListCtrl::~DBufferListCtrl(void)
{
}
BEGIN_MESSAGE_MAP(DBufferListCtrl, CListCtrl)
    ON_WM_PAINT()
    ON_WM_ERASEBKGND()
END_MESSAGE_MAP()


void DBufferListCtrl::OnPaint()
{

    CPaintDC dc(this); // device context for painting
    CRect rect;
    CRect headerRect;
    CDC MenDC;        
    CBitmap MemMap;

    GetClientRect(&rect);    
    GetDlgItem(0)->GetWindowRect(&headerRect);   
    MenDC.CreateCompatibleDC(&dc);   
    MemMap.CreateCompatibleBitmap(&dc, rect.Width(), rect.Height()); 
    MenDC.SelectObject(&MemMap);
    MenDC.FillSolidRect(&rect,RGB(255,255,255));   

    DefWindowProc(WM_PAINT,(WPARAM)MenDC.m_hDC,(LPARAM)0);   

    dc.BitBlt(0,
        headerRect.Height(),   
        rect.Width(),   
        rect.Height(),   
        &MenDC,   
        0,     
        headerRect.Height(),   
        SRCCOPY);   

    MenDC.DeleteDC();
    MemMap.DeleteObject();
}


BOOL DBufferListCtrl::OnEraseBkgnd(CDC* pDC)
{
    // TODO: Add your message handler code here and/or call default

    //return CListCtrl::OnEraseBkgnd(pDC);
    return FALSE;
}


CString DBufferListCtrl::GetItemText(int nItem, int nSubItem) const
{
    ASSERT(::IsWindow(m_hWnd));
    LVITEM lvi;
    memset(&lvi, 0, sizeof(LVITEM));
    lvi.iSubItem = nSubItem;

    CString str;
    int nLen = 512;
    int nRes;

    do
    {
        nLen *= 2;
        lvi.cchTextMax = nLen;
        lvi.pszText = str.GetBufferSetLength(nLen);
        nRes  = (int)::SendMessage(m_hWnd, LVM_GETITEMTEXT, (WPARAM)nItem,
            (LPARAM)&lvi);
    } while (nRes >= nLen-1);

    str.ReleaseBuffer();
    return str;
}

void DBufferListCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
    CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    CRect rcItem(lpDrawItemStruct->rcItem);
    int nItem = lpDrawItemStruct->itemID;
    COLORREF clrTextSave, clrBkSave;
    static _TCHAR szBuff[1024];

    LV_ITEM lvi;
    lvi.mask = LVIF_TEXT | LVIF_STATE;//LVIF_IMAGE |
    lvi.iItem = nItem;
    lvi.iSubItem = 0;
    lvi.pszText = szBuff;
    lvi.cchTextMax = sizeof(szBuff);
    lvi.stateMask = 0xFFFF;
    GetItem(&lvi);

    BOOL bSelected = (lvi.state & LVIS_SELECTED);
    CRect rcAllLabels;
    GetItemRect(nItem, rcAllLabels, LVIR_BOUNDS);

    if (bSelected)
    {
        clrTextSave = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
        clrBkSave = pDC->SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
        pDC->FillRect(rcAllLabels, &CBrush(::GetSysColor(COLOR_HIGHLIGHT)));
    }

    GetItemRect(nItem, rcItem, LVIR_LABEL);
    pDC->DrawText(szBuff, -1, rcItem, DT_LEFT | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER);

    LV_COLUMN lvc;
    lvc.mask = LVCF_FMT | LVCF_WIDTH;
    for (int nColumn = 1; GetColumn(nColumn, &lvc); nColumn++)
    {
        rcItem.left = rcItem.right;
        rcItem.right += lvc.cx;

        int nRetLen = CListCtrl::GetItemText(nItem, nColumn,
            szBuff, sizeof(szBuff));
        if (nRetLen == 0)
            continue;
        UINT nJustify = DT_LEFT;
        switch (lvc.fmt & LVCFMT_JUSTIFYMASK)
        {
        case LVCFMT_RIGHT:
            nJustify = DT_RIGHT;
            break;
        case LVCFMT_CENTER:
            nJustify = DT_CENTER;
            break;
        default:
            break;
        }

        pDC->DrawText(szBuff, -1, rcItem,
            nJustify | DT_SINGLELINE | DT_NOPREFIX | DT_NOCLIP | DT_VCENTER);
    }
    if (lvi.state & LVIS_FOCUSED)
        pDC->DrawFocusRect(rcAllLabels);

    if (bSelected)
    {
        pDC->SetTextColor(clrTextSave);
        pDC->SetBkColor(clrBkSave);
    }
}