一般是这么做
1.对话框添加两个消息处理。
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
2.这样来写具体实现
View Code
1 BOOL CConfigDlg::OnEraseBkgnd(CDC* pDC) 2 { 3 CRect rt; 4 GetClientRect( &rt); 5 HDC hdc = pDC->GetSafeHdc(); 6 HDC hMemdc = CreateCompatibleDC( hdc); 7 HBITMAP hMembmp = CreateCompatibleBitmap( hdc, rt.Width(), rt.Height()); 8 HBITMAP hOldbmp = (HBITMAP)SelectObject( hMemdc, hMembmp); 9 Graphics graphics(hMemdc); 10 graphics.Clear( Color(254,190,216,233)); 11 BitBlt( hdc, 0,0,rt.Width(), rt.Height(), hMemdc, 0,0,SRCCOPY); 12 graphics.ReleaseHDC( hMemdc); 13 SelectObject( hMemdc, hOldbmp); 14 DeleteDC( hMemdc); 15 DeleteObject( hMembmp); 16 return TRUE; 17 }
View Code
1 HBRUSH CConfigDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 2 { 3 HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor); 4 5 switch (pWnd->GetDlgCtrlID()) 6 { 7 case IDC_RADIO_R1: 8 pDC->SetBkMode(TRANSPARENT);//背景透明 9 //pDC->SetTextColor(RGB(255,0,0)); //字体颜色 10 return HBRUSH(GetStockObject(NULL_BRUSH)); 11 case IDC_RADIO_R2: 12 pDC->SetBkMode(TRANSPARENT); 13 return HBRUSH(GetStockObject(NULL_BRUSH)); 14 case IDC_RADIO_R3: 15 pDC->SetBkMode(TRANSPARENT); 16 return (HBRUSH)GetStockObject(NULL_BRUSH); 17 case IDC_CHECK_OPEN: 18 pDC->SetBkMode(TRANSPARENT); 19 return (HBRUSH)GetStockObject(NULL_BRUSH); 20 default: 21 pDC->SetBkMode(TRANSPARENT); 22 return (HBRUSH)GetStockObject(NULL_BRUSH); 23 } 24 25 // if (( nCtlColor == IDC_RADIO_R1 )||( nCtlColor == IDC_RADIO_R2 )||( nCtlColor == IDC_RADIO_R3 )||( nCtlColor == IDC_CHECK_OPEN )) 26 //这种写法不行 27 //调试的时候可以看出来 nCtlColor 不会等于 IDC_RADIO_R1 IDC_RADIO_R2以及IDC_RADIO_R3等 28 // { 29 // pDC->SetBkMode(TRANSPARENT); 30 // pDC->SetTextColor(RGB(255,255,0)); 31 // //return (HBRUSH)::GetStockObject( NULL_BRUSH); 32 // return (HBRUSH)::GetStockObject(HOLLOW_BRUSH); 33 // } 34 return hbr; 35 }
我这里有3个radio ---> IDC_RADIO_R1，IDC_RADIO_R2，IDC_RADIO_R3和一个checkbox ---> IDC_CHECK_OPEN
一般情况下，这几种控件就是透明的。
但是在windows xp使用xp风格主题下，checkbox会变成黑色背景。如果NULL_BRUSH换成GRAY_BRUSH，checkbox会变成灰色背景。
所以这里可以定义一个和背景色相同的画刷，来替换NULL_BRUSH。
或者将checkbox的chaption设为空，后面放一个static文本框来写checkbox的chaption。