c++ - 从 CEdit 派生类更改文本和背景颜色

Question

我有一个来自 CEdit 的派生类，我想更改文本和背景颜色。我已尝试使用消息 ON_WM_CTLCOLOR_REFLECT 和 ON_WM_CTLCOLOR，但我从未收到这些消息。 ON_PAINT 旁边还有其他选项吗？

下面是我如何初始化我的 CColorEdit 控件:

//in my dialog.h
CColorEdit m_test;
//in .cpp
DDX_Control(pDX, IDC_TEST, m_test);

我不能像这样手动设置颜色:

m_test.SetTextColor(...);

这是我尝试处理 ON_WM_CTLCOLOR 的方式:

BEGIN_MESSAGE_MAP(CColorEdit, CEdit)
    ON_WM_CTLCOLOR()
END_MESSAGE_MAP()

HBRUSH CColorEdit::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
    HBRUSH hbr = CEdit::OnCtlColor(pDC, pWnd, nCtlColor);
    if (m_theme != 0)
    {
        pDC->SetTextColor(RGB(0, 255, 0));
    }
    return hbr;
}

这是我对 WM_CTLCOLOR_REFLECT 的尝试:

BEGIN_MESSAGE_MAP(CColorEdit, CEdit)
    //{{AFX_MSG_MAP(CColorEdit)
    ON_WM_CTLCOLOR_REFLECT()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CColorEdit::SetTextColor(COLORREF textColor)
{
    m_textColor = textColor;
    Invalidate();
}
void CColorEdit::SetBkColor(COLORREF backgroundColor)
{
    m_backgroundColor = backgroundColor;
    m_brBkgnd.DeleteObject();
    m_brBkgnd.CreateSolidBrush(backgroundColor);
    Invalidate();
}

HBRUSH CColorEdit::CtlColor(CDC* pDC, UINT nCtlColor)
{
    pDC->SetBkColor(m_backgroundColor);
    pDC->SetTextColor(m_textColor);

    if (nCtlColor)       // To get rid of compiler warning
        nCtlColor += 0;

    return hbr;
}

谢谢。

Answer 1

看here .引用:

It was a real challenge for me to make a simple change of background color for CEdit. I was suprised to find out that there are no standard function, like CEdit::SetBkColor, to do this.

第一步是创建从 CEdit 派生的类并声明函数 CtlColor:

// CustomEdit.h
class CCustomEdit : public CEdit
{
protected:
  HBRUSH CtlColor(CDC *pDC, UINT);
  DECLARE_MESSAGE_MAP()
};

其次，处理WM_CTLCOLOR_REFLECT事件:

// CustomEdit.cpp
BEGIN_MESSAGE_MAP(CCustomEdit, CEdit)
  ON_WM_CTLCOLOR_REFLECT()
END_MESSAGE_MAP()

HBRUSH CCustomEdit::CtlColor(CDC *pDC, UINT)
{
  COLORREF bkColor = RGB(255, 255, 255);
  pDC->SetBkColor(bkColor);
  return CreateSolidBrush(bkColor);
}

所以你需要使用两者!