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Skins in a Dialog Based Application

, 9 Jun 2002
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An Easy way to skin a Dialog Based Application

Sample Image

Introduction

This is a very simple example to implement a skin in a Dialog Based Application. The code is actually written by a friend (sun@codefinger.de ) of mine, so thanks go to him. I am just showing you how simple it is to use. Also thanks to Davide Calabro who gave me permission to use his CButtonST class.

Example

In my example I am using a simple Dialog based App called “Skin”. Import a Bitmap you like for your Dialog. In our case it's labeled IDB_MAIN. Create the following variables and function in your Dialog header file.

CSkinDlg : public CDialog
{
public:
        CSkinDlg();
    HBITMAP m_hBmp;
    HRGN m_hWndRgn;
    HRGN DIBToRgn(HBITMAP hBmp,COLORREF BkColor,BOOL Direct); // Handle the Skin
    .
    .
    .
In the Constructor do the following:
CSkinDlg::CSkintDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CSkinDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CSkinDlg)
    //}}AFX_DATA_INIT
    m_hBmp=(HBITMAP)LoadImage(AfxGetApp()->m_hInstance,
                                   MAKEINTRESOURCE(IDB_MAIN),
                                   IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);

    m_hWndRgn=DIBToRgn(m_hBmp,0x00ff00,FALSE);
}

Insert the function called HRGN DIBToRgn(HBITMAP hBmp, COLORREF BkColor, BOOL Direct) to your Dialog class and paste the following code to it.

HRGN CSkinDlg ::DIBToRgn(HBITMAP hBmp, COLORREF BkColor, BOOL Direct)
{
    // use to return the handle of the HGRN
      HRGN hRgn = NULL;                    
    #define MAX_ALLOC_RECTS  100
    //the difference of the color
    COLORREF  Tolerance=0x00101010;
    if (hBmp)
    {
        //creat the dib to save the dc
        HDC hMemDC = CreateCompatibleDC(NULL);        
        if (hMemDC)
        {
            BITMAP bm;
            //get the info of the bitmap
            GetObject(hBmp, sizeof(bm), &bm);    

            BITMAPINFOHEADER BmpInfoh = {     // the struct of the bitmap
                    sizeof(BITMAPINFOHEADER), // biSize
                    bm.bmWidth,               // biWidth;
                    bm.bmHeight,              // biHeight;
                    1,                        // biPlanes;
                    32,                       // biBitCount
                    BI_RGB,                   // biCompression;
                    0,                        // biSizeImage;
                    0,                        // biXPelsPerMeter;
                    0,                        // biYPelsPerMeter;
                    0,                        // biClrUsed;
                    0                         // biClrImportant;
            };
            //design a void point to point to the bitmap
            LPVOID pBit32; 
            //creat a DIB
            HBITMAP hDib32 = CreateDIBSection(hMemDC, 
                    (BITMAPINFO *)&BmpInfoh, 
                    DIB_RGB_COLORS, &pBit32, NULL, 0);
            if (hDic32)
            {
                //copy dib to DC
                HBITMAP hOldib32 = (IBITMAP)SelectObject(hMemDC, hDib32);
                // create a DC to save orgin bitmap
                HDC hDC = CreateCompatibleDC(hMemDC);
                if (hDC)
                {
                    BITMAP bm32;
                    // get the new 34 bit Dib size
                    GetObject(hDib32, sizeof(bm32), &bm32);
                    //make sure the 32Dib's every line pilex's is 4 's times
                    while (bm32.bmWidthBytes % 4)
                        bm32.bmWidthBytes++;
                    //copy the orginal dib to DC
                    HBITMAP holdBmp = (HBITMAP)SelectObject(hDC, hBmp);
                    //copy dib to memory DC
                    BitBlt(hMemDC, 0, 0, bm.bmWidth, bm.bmHeight, hDC, 0, 0, SRCCOPY);
                    DWORD MaxRects = MAX_ALLOC_RECTS;
                    SYSTEM_INFO  Sysinfo;
                    //get memory size
                    GetSystemInfo(&Sysinfo);
                    //make a stack which can chang big
                    //alloct memory
                    HANDLE hRcData=HeapCreate(HEAP_GENERATE_EXCEPTIONS,Sysinfo.dwPageSize, 0);
                    RGNDATA * pRcData=(RGNDATA*)HeapAlloc(hRcData,HEAP_ZERO_MEMORY,
                        sizeof(RGNDATAHEADER)+sizeof(RECT)*MaxRects);
                     //fill the the RGNDATA struck
                    pRcData->rdh.dwSize = sizeof(RGNDATAHEADER);
                    pRcData->rdh.iType = RDH_RECTANGLES;
                    pRcData->rdh.nCount = pRcData->rdh.nRgnSize = 0;
                    SetRect(&pRcData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
                             BYTE hr,hg,hb,lr,lg,lb;
                    switch(BkColor)
                    {
                    case RGB(255,255,255):    //if the bkcolor is white
                        hr = GetRValue(BkColor);
                        hg = GetGValue(BkColor);
                        hb = GetBValue(BkColor);
                        lr = min(0xff, hr - GetRValue(Tolerance));
                        lg = min(0xff, hg - GetGValue(Tolerance));
                        lb = min(0xff, hb - GetBValue(Tolerance));
                        break;
                    case RGB(0,0,0):    //if the bkcolor is black
                        lr = GetRValue(BkColor);
                        lg = GetGValue(BkColor);
                        lb = GetBValue(BkColor);
                        hr = min(0xff, lr + GetRValue(Tolerance));
                        hg = min(0xff, lg + GetGValue(Tolerance));
                        hb = min(0xff, lb + GetBValue(Tolerance));
                        break;
                    default:        //if the bkcolor is other color
                        Tolerance=0x111111;
                        lr =max(0, GetRValue(BkColor)-GetRValue(Tolerance));
                        lg = max(0,GetGValue(BkColor)-GetGValue(Tolerance));
                        lb = max(0,GetBValue(BkColor)-GetBValue(Tolerance));
                        hr=min(0xff,GetRValue(BkColor)+GetRValue(Tolerance));
                        hg=min(0xff,GetGValue(BkColor)+GetGValue(Tolerance));
                        hb=min(0xff,GetBValue(BkColor)+GetBValue(Tolerance));
                        break;
                    }
                    // Get the bit point and do the search
                    BYTE *pBits = (BYTE *)bm32.bmBits + 
                                         (bm32.bmHeight - 1) * bm32.bmWidthBytes;
                    for (int y = 0; y < bm.bmHeight; y++)
                    {
                        for (int x = 0; x < bm.bmWidth; x++)
                        {
                            int x0 = x;
                            DWORD *pColor = (DWORD *)pBits + x;
                            BYTE dr,dg,db;
                            while (x < bm.bmWidth)
                            {
                                dr=GetRValue(*pColor);
                                dg=GetGValue(*pColor);
                                db=GetBValue(*pColor);

                                if ((dr>= lr && dr<= hr) && (dg>=lg&&dg<=hg) 
                                                         && (db>=lb&&db<=hb))
                                {
                                    if(Direct)
                                        break;
                                    else
                                    {
                                        pColor++;
                                        x++;
                                    }
                                  }
                                else if(Direct)
                                {
                                    pColor++;
                                    x++;
                                }
                                else
                                    break;

                            }
                            if (x > x0)
                            {
                                if (pRcData->rdh.nCount >= MaxRects)
                                {
                                    MaxRects += MAX_ALLOC_RECTS;
                                    //re alloc the stack
                                    pRcData=(RGNDATA*)HeapReAlloc(
                                    hRcData,HEAP_ZERO_MEMORY,pRcData, 
                                    sizeof(RGNDATAHEADER)+sizeof(RECT)*MaxRects);
                                }
                                RECT *pr = (RECT *)&pRcData->Buffer;
                                SetRect(&pr[pRcData->rdh.nCount], x0, y, x, y+1);
                                pRcData->rdh.rcBound.left = x0;
                                pRcData->rdh.rcBound.top = y;
                                pRcData->rdh.rcBound.right = x;
                                pRcData->rdh.rcBound.bottom = y+1;
                                pRcData->rdh.nCount++;

                                if (pRcData->rdh.nCount == 3000)
                                {    
                                    HRGN tmphRgn = ExtCreateRegion(NULL,
                                    sizeof(RGNDATAHEADER) + (sizeof(RECT) * MaxRects),
                                    pRcData);
                                    if (hRgn)
                                    {
                                        CombineRgn(hRgn, hRgn, tmphRgn, RGN_OR);
                                        DeleteObject(tmphRgn);
                                    }
                                    else
                                        hRgn = tmphRgn;
                                    pRcData->rdh.nCount = 0;
                                    SetRect(&pRcData->rdh.rcBound, 
                                    MAXLONG, MAXLONG, 0, 0);
                                }
                            }
                        }

                        // search next line
                        pBits -= bm32.bmWidthBytes;
                    }
                    HRGN tmphRgn = ExtCreateRegion(NULL, 
                            sizeof(RGNDATAHEADER) + (sizeof(RECT) * MaxRects), pRcData);
                    if (hRgn)
                    {
                        CombineRgn(hRgn, hRgn, tmphRgn, RGN_OR);
                        DeleteObject(tmphRgn);
                    }
                    else
                        hRgn = tmphRgn;
                    // make a rect ,use this rect xor to the  BkColor
                    //then we can get the rect we want
                    if(!Direct)
                    {
                        HRGN hRect=CreateRectRgn(0,0,bm.bmWidth,bm.bmHeight);
                                        if(hRect)
                        {
                            CombineRgn(hRgn,hRgn,hRect,RGN_XOR);
                            DeleteObject(hRect);
                        }
                        else
                            return NULL;
                    }
                    //release the memory
                    HeapFree(hRcData,HEAP_NO_SERIALIZE,pRcData);
                    SelectObject(hDC, holdBmp);
                    DeleteDC(hDC);
                    DeleteObject(holdBmp);
                }
                SelectObject(hMemDC,hOldib32);
                DeleteDC(hMemDC);
                DeleteObject(hOldib32);
                DeleteObject(hDib32);
            }
            else
                DeleteDC(hMemDC);
        }
    }
    return hRgn;
  }

Add a handler for the ON_WM_ERASEBKND message to erase the background of the Dialog:

BOOL CSkinDlg::OnEraseBkgnd(CDC* pDC) 
{
    if(m_hBmp)
    {
        BITMAP bm;
        GetObject(m_hBmp,sizeof(bm),&bm);
        HDC hMemdc=CreateCompatibleDC(pDC->m_hDC); 
        if(hMemdc)
        {
           HBITMAP hOldBmp=(HBITMAP)SelectObject(hMemdc,m_hBmp);
           if(hOldBmp)
           {
               BitBlt(pDC->m_hDC,0,0,bm.bmWidth,bm.bmHeight,hMemdc,0,0,SRCCOPY);
               SelectObject(hMemdc,hOldBmp);
               DeleteDC(hMemdc);
               DeleteObject(hOldBmp);
               return TRUE;
           }
           else
             DeleteDC(hMemdc);
        }
    }
    return CDialog::OnEraseBkgnd(pDC);
}

In your OnInitDialog enter the following code:

BOOL CSkinDlg::OnInitDialog()
{
    .
    .
    .
    // Show the Skin
    if(m_hWndRgn)
        SetWindowRgn(m_hWndRgn,TRUE);

    return TRUE;  // return TRUE  unless you set the focus to a control
}

The 'minimise' and 'close' boxes on the dialog are implemented using Davide Calabro's CButtonST class

That's it ! Run your app and you will see your Great Skin. This Article is Provided by www.codefinger.de

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Sonu Kapoor

Canada Canada
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Comments and Discussions

 
Questionrounded corners? Pinmemberhoobyjuice20-May-04 2:13 
AnswerRe: rounded corners? PinsussAnonymous1-Jan-05 20:02 
GeneralRe: rounded corners? PinmemberDon Miguel21-Mar-06 2:44 
GeneralRe: rounded corners? Pinmemberdigitalmythology11-Dec-06 22:02 

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Article Copyright 2002 by Sonu Kapoor
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