如何在 mfc 中更改静态文本控件的背景颜色(按下按钮或计时器时)?

2022-01-12 00:00:00 visual-c++ mfc

我知道它可以用 OnCtlColor() 来完成，但是它会在加载表单并且要绘制静态文本时改变颜色，我想在加载表单之后执行它，也许有一个计时器，我搜索了寻求解决方案，但我没有找到明确的解决方案，这就是我写的:

I know it can be done with OnCtlColor(), but it changes colors when the form is being loaded and the static texts are to be drawn, I want to do it after form is loaded, with a timer maybe, I searched for a solution but I didn't find a clear one, this is what I wrote:

void CTabFive::OnBnClickedButton1()
{
    // TODO: Add your control notification handler code here
    CWnd* pWnd = this->GetDlgItem(IDC_Chromosome1);
    CDC* dc = pWnd->GetDC();
    dc->SetBkColor(RGB(200,0,0));
    pWnd->Invalidate();
    pWnd->UpdateWindow();
    Invalidate();
    UpdateWindow();
    //flag = true;
}

推荐答案

不需要计时器.在这里，我有一个初始化为 false 的类的 bool m_coloured 成员，并在按下按钮时切换.OnCtlColor 将根据 m_coloured 的值绘制为红色或系统颜色.效果很好.

No timer is needed. Here I have a bool m_coloured member of the class initialized to false, and toggled in the button press. The OnCtlColor will draw in red or in the system colour depending on the value of m_coloured. Works nicely.

HBRUSH Cmfcvs2010Dlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
    HBRUSH hbr = CDialogEx::OnCtlColor(pDC, pWnd, nCtlColor);

    if (nCtlColor == CTLCOLOR_STATIC && pWnd->GetDlgCtrlID() == IDC_LABEL)
    {
        DWORD d = GetSysColor(COLOR_BTNFACE);

        COLORREF normal = RGB(GetRValue(d), GetGValue(d), GetBValue(d));
        COLORREF red = RGB(255, 0, 0);

        pDC->SetBkColor(m_coloured ? red : normal);

    }
    return hbr;
}


void Cmfcvs2010Dlg::OnBnClickedButton1()
{
    m_coloured = !m_coloured;
    Invalidate();
}

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