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7.6

Drawing custom form using Layered windows in MFC

Asked by exprotein in C / C++ / C# Editors and IDEs, Windows MFC Programming, C++ Programming Language

Tags: C++, MFC, Visual Studio 2005

I need to create a MFC dialog application, the dialog used a PNG for background, the borders of the image have shadows, so I need to blend it with the background screen. So far, I've successful to create a dialog using that PNG image as background by UpdateLayeredWindows. The problem is I need to draw some texts and image buttons on the dialog. I'm trying to create my own button class by extending CButton as CImageButton, and drawing my own image on the button. But I'm still not success. What I'm trying to do is using UpdateLayeredWindows in my CImageButton class whenever an image for button is set.

below is how I use UpdateLayeredWindows (I read about it in CodeProject)

Because I use PNG, so I use CImage to load it, and convert it to CBitmap.

Any advice is welcome.

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                 CBitmap * bmp = CBitmap::FromHandle(m_bgImage);
 
    BITMAP bmpInfo;
    bmp->GetBitmap(&bmpInfo);
 
    ::PreMultiplyRGBChannels(*bmp, (LPBYTE)bmpInfo.bmBits);
    ModifyStyleEx(0, WS_EX_LAYERED);
 
    CDC dcMemory;
    CDC dcScreen;
    dcScreen.Attach(::GetDC(NULL));
    dcMemory.CreateCompatibleDC(&dcScreen);
    
    //m_bgImage.AlphaBlend(GetDC()->GetSafeHdc(), 0, 0);
 
    CBitmap *pOldBitmap= dcMemory.SelectObject(bmp);
 
    // get the window rectangular (we are only interested in the top left position)
    CRect rectDlg;
    GetWindowRect(rectDlg);
 
    // calculate the new window position/size based on the bitmap size
    CPoint ptWindowScreenPosition(rectDlg.TopLeft());
    //CSize szWindow(bmpInfo.bmWidth, bmpInfo.bmHeight);
    CSize szWindow(bmpInfo.bmWidth, bmpInfo.bmHeight);
 
    // Perform the alpha blend
 
    // setup the blend function
    BLENDFUNCTION blendPixelFunction= { AC_SRC_OVER, 0, PATCHER_DIALOG_CONSTANT_ALPHA, AC_SRC_ALPHA };
    CPoint ptSrc(0,0); // start point of the copy from dcMemory to dcScreen
 
    // perform the alpha blend
    BOOL bRet = UpdateLayeredWindow(&dcScreen, &ptWindowScreenPosition, &szWindow, &dcMemory,
        &ptSrc, 0, &blendPixelFunction, ULW_ALPHA);
    //::UpdateLayeredWindow(wnd, dcScreen, &ptWindowScreenPosition, &szWindow, dcMemory,
    //    &ptSrc, 0, &blendPixelFunction, ULW_ALPHA);
 
    ASSERT(bRet); // ops... something bad just occured....
 
    // clean up
    dcMemory.SelectObject(pOldBitmap);
           
         

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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Drawing custom form using Layered windows in MFC

Asked by exprotein in C / C++ / C# Editors and IDEs, Windows MFC Programming, C++ Programming Language

Tags: C++, MFC, Visual Studio 2005

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