VC 窗口重绘 标题栏 非客户区

 

void CMainFrame::OnNcPaint() 
{
    // TODO: Add your message handler code here

    m_mouseHover = 0;
    // 重载非客户区自绘,只需要在此调用自定义重绘方法.(其它消息均不需要)
    DrawWndNCRgn();

    //TRACE(_T("OnNcPaint\n"));
    // Do not call CFrameWnd::OnNcPaint() for painting messages
}

 

 

void CMainFrame::DrawWndNCRgn()
{
    CRect rcWin;
    CDC* pDC, memDC;
    CBitmap memBmp, *pOldBmp;
    
    pDC = GetWindowDC();        //窗口所有区域的DC(包含NC)
    GetWindowRect(&rcWin);        //窗口所有区域大小(包含NC)
    OffsetRect(&rcWin, -rcWin.left, -rcWin.top);

    //Update & Save Rect info to Data Member
    m_rcClose.left = rcWin.right - WND_TITLE_BAR_XYFRAME - WND_TITLE_BAR_CLOSE_CX;
    m_rcClose.top = rcWin.top;
    m_rcClose.right = rcWin.right - WND_TITLE_BAR_XYFRAME;
    m_rcClose.bottom = rcWin.top + WND_TITLE_BAR_CLOSE_CY;

    m_rcMax.left = m_rcClose.left - WND_TITLE_BAR_MAX_CX;
    m_rcMax.top = m_rcClose.top;
    m_rcMax.right = m_rcClose.left;
    m_rcMax.bottom = m_rcClose.top + WND_TITLE_BAR_MAX_CY;

    m_rcMin.left = m_rcMax.left - WND_TITLE_BAR_MIN_CX;
    m_rcMin.top = m_rcClose.top;
    m_rcMin.right = m_rcMax.left;
    m_rcMin.bottom = m_rcClose.top + WND_TITLE_BAR_MIN_CY;

    //双缓冲绘图
    memDC.CreateCompatibleDC(pDC);
    memBmp.CreateCompatibleBitmap(pDC, rcWin.Width(), rcWin.Height());

    memDC.SetBkMode(TRANSPARENT);                    //设置背景透明
    memDC.SetBkColor(RGB(255, 0, 255));
    memDC.SetTextColor(GetSysColor(COLOR_WINDOW));    //标题栏白色文字
    pOldBmp = memDC.SelectObject(&memBmp);

    CBrush brush(RGB(255, 0, 0));        //先把所有窗口区域刷成透明处理的颜色
    memDC.FillRect(rcWin, &brush);
    brush.DeleteObject();
    
    //虽然我们只画非客户区,但是获取的是整个窗口区域,
    //我们没有画的地方就是客户区,需要做透明处理.
    DrawBorders(&memDC, rcWin);
    DrawCaptionRgn(&memDC, rcWin, TRUE, 0);

    //中间大部分客户端区域需要透明处理.否则会造成客户端区域刷新严重闪烁.
    TransparentBlt(pDC->m_hDC, rcWin.left, rcWin.top, rcWin.Width(), rcWin.Height(),
        memDC.m_hDC, 0, 0, rcWin.Width(), rcWin.Height(), RGB(255, 0, 0)); //透明的颜色

    DrawCaptionBtn();

    memDC.SelectObject(pOldBmp);
    memDC.DeleteDC();
    memBmp.DeleteObject();
}