1. 新建一個MFC對話框工程取名TransButton
2. 在ResourceView處插入一背景圖片IDB_BITMAP1
3. 在對話框中拉4個控件:兩個按鈕,兩個STATIC
4. 增加TransButtonDlg.h文件中增加如下3個類成員
HBRUSH GetBkBrush( HWND hWnd, UINT nID, HBITMAP hBmBk );
HBITMAP m_hBmBkgnd; // 對話框背景圖片
HBRUSH m_hBrCtl[2]; // 控件背景畫刷
5. 在TransButtonDlg.cpp中增加GetBkBrush()的實現
HBRUSH CTransButtonDlg::GetBkBrush( HWND hWnd, UINT nID, HBITMAP hBmBk )
{
#define _X(x) (x.left)
#define _Y(x) (x.top)
#define _W(x) (x.right - x.left)
#define _H(x) (x.bottom - x.top)
HWND hWndCtrl;
hWndCtrl = ::GetDlgItem( hWnd, nID );
HBRUSH hBrushCtrl = NULL;
if( NULL != hWndCtrl )
{
RECT rcCtrl;
::GetWindowRect( hWndCtrl, &rcCtrl );
::ScreenToClient(hWnd, (LPPOINT)&rcCtrl);
::ScreenToClient(hWnd, ((LPPOINT)&rcCtrl)+1);
HDC hDC = ::GetDC(hWnd);
HDC hMemDCBk = CreateCompatibleDC( hDC );
HDC hMemDCCtrl = CreateCompatibleDC( hDC );
HBITMAP hBmCtrl = CreateCompatibleBitmap( hDC, _W(rcCtrl), _H(rcCtrl) );
HBITMAP hBmOldBk;
HBITMAP hBmOldCtrl;
hBmOldBk = (HBITMAP) ::SelectObject( hMemDCBk, hBmBk );
hBmOldCtrl = (HBITMAP) ::SelectObject( hMemDCCtrl, hBmCtrl );
::BitBlt( hMemDCCtrl, 0, 0, _W(rcCtrl), _H(rcCtrl), hMemDCBk, _X(rcCtrl), _Y(rcCtrl), SRCCOPY );
::SelectObject(hMemDCCtrl, hBmOldCtrl );
::SelectObject(hMemDCBk, hBmOldBk );
hBrushCtrl = ::CreatePatternBrush( hBmCtrl );
DeleteObject( hBmCtrl );
::DeleteDC( hMemDCBk );
::DeleteDC( hMemDCCtrl );
::ReleaseDC( hWnd, hDC );
}
return hBrushCtrl;
}
6. 在OnInitDialog()中增加下面一段截取控件所在部分的圖片:
m_hBmBkgnd=::LoadBitmap(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDB_BITMAP1) );
if( m_hBmBkgnd )
{
m_hBrCtl[0]=GetBkBrush(GetSafeHwnd(),IDC_BUTTON_TEST1, m_hBmBkgnd );
m_hBrCtl[1]=GetBkBrush(GetSafeHwnd(),IDC_STATIC_TEST1,m_hBmBkgnd );
}
7. 增加WM_PAINT的處理函數,並在函數中增加畫背景的部分(OnPaint()函數):
CDC memDC;
CBitmap bmBkgnd;
bmBkgnd.Attach( m_hBmBkgnd );
memDC.CreateCompatibleDC(&dc);
CBitmap *pOldBm = memDC.SelectObject( &bmBkgnd );
BITMAP bm;
bmBkgnd.GetObject(sizeof(bm), &bm);
dc.BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &memDC, 0, 0, SRCCOPY );
memDC.SelectObject( pOldBm );
bmBkgnd.Detach();
8. 增加WM_CTLCOLOR的處理函數,並在其中增加畫控件背景的部分:
if(pWnd->GetDlgCtrlID() == IDC_BUTTON_TEST1 )
{
pDC->SetTextColor(RGB(255, 0, 0));
pDC->SetBkMode( TRANSPARENT ) ;
return m_hBrCtl[0];
}
else if(pWnd->GetDlgCtrlID() == IDC_STATIC_TEST1)
{
pDC->SetTextColor(RGB(255, 0, 0));
pDC->SetBkMode( TRANSPARENT ) ;
return m_hBrCtl[1];
}
9. 編譯鏈接
10. 運行後的圖片如下: