How to Send Any Arrow Key Related Messages to .OCX File

Article ID: Q132450
Creation Date: 11-JUL-1995
Revision Date: 12-OCT-1995

The information in this article applies to:

Microsoft OLE Control Developer's Kit (CDK) for Windows and Windows NT, versions 1.0 and 1.1

SUMMARY

To send any arrow key related messages to your control, you must override the PreTranslateMessage for your .OCX file.

MORE INFORMATION

You need to override the PreTranslateMessage member function, forward key presses that you want to trap to the control, and return TRUE. You should call COleControl::PreTranslateMessage for all keys that you do not process, and return the value from COleControl::PreTranslateMessage.

The following code shows how to implement PreTranslateMessage in your XXXXXCTL.CPP file:

BOOL CXxxxCtrl::PreTranslateMessage(LPMSG lpMsg) {

   switch (lpMsg->message)
   {
   case WM_KEYDOWN:
   case WM_KEYUP:
      switch (lpMsg->wParam)
      {
         case VK_UP:
         case VK_DOWN:
         case VK_LEFT:
         case VK_RIGHT:

SendMessage(lpMsg->message,lpMsg->wParam,lpMsg->lParam);

            return TRUE;
      }
      break;
   }

   return COleControl::PreTranslateMessage(lpMsg);

}

You also need to include the following declaration in your control class declaration in XXXXCTL.H along with the other virual function declarations:

   virtual BOOL PreTranslateMessage(LPMSG lpMsg);

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