CE 控件透明

最新推荐文章于 2022-03-17 16:55:11 发布

daniel_yao

最新推荐文章于 2022-03-17 16:55:11 发布

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分类专栏： project 文章标签： null dialog mobile image bt

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本文介绍了一个用于Windows应用程序的方法，该方法可以根据指定控件的位置及其父对话框窗口的背景图像来创建背景刷。通过获取控件的位置并从父窗口背景中截取相应部分，可以为每个控件创建个性化的背景刷。

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#define _X(x) (x.left)
#define _Y(x) (x.top)
#define _W(x) (x.right - x.left)
#define _H(x) (x.bottom - x.top)

//**************************************************************************************
//
// GetBkBrush( HWND hWnd, UINT nID, HBITMAP hBmBk )
//
// Creates Background brush for the control specified by nID
// according to its position in the parent dialog window.
//
// hWnd [in]: Handle to the parent window
// nID [in]: Control ID
// hBmBk [in]: Bitmap handle of the parent dialog's background image
//
//
//**************************************************************************************

HBRUSH GetBkBrush( HWND hWnd, UINT nID, HBITMAP hBmBk )
{
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;
}

使用例子：
m_hBmBkgnd = ::LoadBitmap( _Module.GetResourceInstance(), MAKEINTRESOURCE(IDB_BT_NEWADD) );
if( m_hBmBkgnd )
{
m_hBrCtl[0] = GetBkBrush( m_hWnd, IDC_ADD_NAME, m_hBmBkgnd );
m_hBrCtl[1] = GetBkBrush( m_hWnd, IDC_ADD_MOBILE, m_hBmBkgnd );
m_hBrCtl[2] = GetBkBrush( m_hWnd, IDC_ADD_WORK, m_hBmBkgnd );
m_hBrCtl[3] = GetBkBrush( m_hWnd, IDC_ADD_HOME, m_hBmBkgnd );
m_hBrCtl[4] = GetBkBrush( m_hWnd, IDC_ADD_OTHER, m_hBmBkgnd );
}
else
{
m_hBrCtl[0] = NULL;
m_hBrCtl[1] = NULL;
m_hBrCtl[2] = NULL;
m_hBrCtl[3] = NULL;
m_hBrCtl[4] = NULL;
}

LRESULT OnCtlColorStatic(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam, BOOL& /*bHandled*/)
{
HDC hDCBtn = (HDC) wParam;
HWND hWndCtrl = (HWND) lParam;

UINT nID = ::GetDlgCtrlID( hWndCtrl );

::SetBkMode( hDCBtn, TRANSPARENT );
switch( nID )
{
case IDC_ADD_NAME:
return (LRESULT)m_hBrCtl[0];
case IDC_ADD_MOBILE:
return (LRESULT)m_hBrCtl[1];
case IDC_ADD_WORK:
return (LRESULT)m_hBrCtl[2];
case IDC_ADD_HOME:
return (LRESULT)m_hBrCtl[3];
case IDC_ADD_OTHER:
return (LRESULT)m_hBrCtl[4];
default:
break;
}

return 0;
}