MFC - encountering deadly diamond of death

Question

A newbie here in windows programming.

I want to make a dialogbox that uses both CPropertyPage and CDHtmlDialog?

class CPropertyPage : public CDialog  
class CDHtmlDialog  : public CDialog

Since I can't change the inheritance for each of the above case to "virtual public", is it still possible to make a dialog that has some fields from CPropertyPage and some forms from CDHtmlDialog?

Answer 1

You can create the HTML dialog as child dialog of property page. The only problem is that child dialog closes if user pressed cancel. You have to override CDHtmlDialog::OnCancel. Example:

class CMyDHtmlDialog : public CDHtmlDialog
{
    void OnCancel()
    {
        //GetParent()->GetParent()->PostMessage(WM_COMMAND, IDCANCEL);
    }
};

class CMyPropertyPage : public CPropertyPage
{
    CMyDHtmlDialog child;
    BOOL OnInitDialog()
    {
        BOOL res = CPropertyPage::OnInitDialog();
        child.Create(IDD_HTML, this);
        CRect rc;
        GetClientRect(&rc);
        child.SetWindowPos(NULL, 0, 0, rc.Width(), rc.Height(), SWP_SHOWWINDOW);
        return res;
    }
};