MFC OnCtlColor函数

MFC类库提供了CWnd::OnCtlColor函数,在工作框架的子窗口被重画时将调用该成员函数.在界面处理的时候很有用处

因此可以重载WM_CTLCOLOR消息的响应函数.

【MSDN】此函数的原型:

The framework calls this member function when a child control is about to be drawn

afx_msg HBRUSH OnCtlColor(CDC *pDC,CWnd *pWnd,UINT nCtlColor);

pDC

Contains a pointer to the display context for the child window. May be temporary.

pWnd

Contains a pointer to the control asking for the color. May be temporary.

nCtlColor

Contains one of the following values, specifying the type of control:

• CTLCOLOR_BTN   Button control

• CTLCOLOR_DLG   Dialog box

• CTLCOLOR_EDIT   Edit control

• CTLCOLOR_LISTBOX   List-box control

• CTLCOLOR_MSGBOX   Message box

• CTLCOLOR_SCROLLBAR   Scroll-bar control

• CTLCOLOR_STATIC   Static control 
   

• 参数nCtlColor用于指定控件的类型,可以是:
             .CTLCOLOR_BTN                按钮控件
             .CTLCOLOR_DLG                对话框
             .CTLCOLOR_EDIT               编辑框
             .CTLCOLOR_LISTBOX            列表控件
             .CTLCOLOR_MSGBOX             消息控件
             .CTLCOLOR_SCROLLBAR 滚动条控件
             .CTLCOLOR_STATIC             静态控件

 返回值：

    OnCtlColor must return a handle to the brush that is to be used for painting the control background

 使用方式一：
      假设你已有了名为My的对话框工程.你有了一个STATIC的控件，ID为IDC_STATIC.

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)            {        HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);          // TODO: Change any attributes of the DC here           if (nCtlColor==CTLCOLOR_STATIC){ // 执行需要的处理                    pDC->SetTextColor(RGB(255,0,0));  //字体颜色                       pDC->SetBkColor(RGB(0, 0, 255));   //字体背景色                  }        // TODO: Return a different brush if the default is not desired        return hbr;           }

  使用方式二：
如果要指定某个特定控件可以这样写

if (pWnd->GetDlgCtrlID()==IDC_STATIC)  // 获取控件的ID
{
       pDC->SetTextColor(RGB(255,0,0));  //设置字体颜色
       pDC->SetBkMode(TRANSPARENT); //设置字体背景为透明
// TODO: Return a different brush if the default is not desired
  return (HBRUSH)::GetStockObject(BLACK_BRUSH);  // 设置背景色
}
else
return hbr;

【注】

WHITE_BRUSH:白色

GRAY_BRUSH:灰色

NULL_BRUSH:透明

HOLLOW_BRUSH ：透明