Shoutbox

C++ code:

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//////////// Globals ////////////
// HWND hWndBtn1 = NULL;
// HWND hWndBtn2 = NULL;
// WNDPROC wpOrigButtonProc = NULL;
// HBITMAP hBmpNormal = NULL;
// HBITMAP hBmpHiLight = NULL;
// BOOL bMouseInWindow = FALSE;
 
// IDC_DLGBTN1 is a button resource
// IDC_DLGBTN2 is a button resource
// IDB_BMP_NORMAL is a bitmap resource
// IDB_BMP_HILIGHT is a bitmap resource
 
// in WM_INITDIALOG of main dialog procedure
hWndBtn1 = GetDlgItem(hWnd, IDC_DLGBTN1);
hWndBtn2 = GetDlgItem(hWnd, IDC_DLGBTN2);
     // load bitmaps
hBmpNormal  = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BMP_NORMAL));
hBmpHiLight = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BMP_HILIGHT));
     // set initial button images        
SendMessage(hWndBtn1, BM_SETIMAGE,
          (WPARAM)IMAGE_BITMAP, (LPARAM)hBmpNormal );
SendMessage(hWndBtn2, BM_SETIMAGE,
          (WPARAM)IMAGE_BITMAP, (LPARAM)hBmpNormal);
     // subclass buttons            
wpOrigButtonProc = (WNDPROC) SetWindowLong(hWndBtn1,
          GWLP_WNDPROC, (LONG) NewButtonProc);
/* same original btn proc */ SetWindowLong(hWndBtn2,
          GWLP_WNDPROC, (LONG) NewButtonProc);
 
// in WM_CLOSE of main dialog procedure
SetWindowLong(hWndBtn1, GWLP_WNDPROC, (LONG)wpOrigButtonProc);
SetWindowLong(hWndBtn2, GWLP_WNDPROC, (LONG)wpOrigButtonProc);
 
// NewButtonProc window procedure
LRESULT CALLBACK NewButtonProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
     switch(uMsg)
     {
          case WM_MOUSEMOVE:
          {            
               if (!bMouseInWindow)
               {
                    bMouseInWindow = true;
                    SendMessage(hWnd, BM_SETIMAGE,
                         (WPARAM)IMAGE_BITMAP, (LPARAM)hBmpHiLight );
                    TRACKMOUSEEVENT tme;
                    tme.cbSize = sizeof(tme);
                    tme.dwFlags = TME_LEAVE;
                    tme.hwndTrack = hWnd;
                    TrackMouseEvent(&tme);
               }
          }
          break;
          case WM_MOUSELEAVE:
          {
               bMouseInWindow = false;
               SendMessage(hWnd, BM_SETIMAGE,
                    (WPARAM)IMAGE_BITMAP, (LPARAM)hBmpNormal);
          }
          break;
          default:
               return CallWindowProc(wpOrigButtonProc, hWnd,
                    uMsg, wParam, lParam);
     }
     return true;
}

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