Create a Modeless Dialog Box as Child Window

This article is part of the drag and drop interface samples.

1. Serializing ASCII Data
2. Modeless child dialog
3. Modeless sibling dialog
4. The drag source
5. The MFC drop target
6. The TBTextTarget class

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• Download source files - 20.4 KB

To create the modeless dialog as sibling, follow this link.

Follow these steps:

1. Create a new dialog resource and use the Class Wizard for making a new CDialog based class for it; let's call it CDropDialog.
2. In your CFormView-derived class, add a (private) member variable of type CDropDialog* as a container for the modeless dialog class, let's call it m_pModeless. In the constructor of your view, make sure you initialize m_pModeless to NULL.
3. In your appropriate message handler, let's call it OnModeless, do the following:

   void CInterfaceView::OnModeless() 
   {
       // Display the modal dialog box
       if (!m_pModeless)
           m_pModeless = new CDropDialog;
   
       if (!::IsWindow(m_pModeless->GetSafeHwnd()))
           m_pModeless->Create(IDD_DIALOG1, this);
   
       m_pModeless->ShowWindow(SW_SHOW); 
   }

In the destructor of the parent window, proof if the dialog has been closed and release the memory:

CInterfaceView::~CInterfaceView()
{
    if (m_pModeless)
    {
        if (::IsWindow(m_pModeless->GetSafeHwnd()))
            m_pModeless->EndDialog(IDCANCEL);
        delete m_pModeless;
    }
}

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