Re: Resizable dialog

From:
David Wilkinson <no-reply@effisols.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 08 Feb 2008 13:08:07 -0500
Message-ID:
<#MBHP2naIHA.4880@TK2MSFTNGP03.phx.gbl>
Priya wrote:

Hi guys,

Thank you for taking the time to answer my question.

The problem was that I had declared the second dialog as a member variable
of the first dialog class. I fixed it by declaring a pointer to the dialog as
the member variable and creating the dialog object just before displaying it.

Initially the code was something like this:

class CDlg1 : public CDialog
{
    DECLARE_DYNAMIC(CDlg1)

public:
    CDlg1(CWnd* pParent = NULL); // standard constructor
    virtual ~CDlg1();

// Dialog Data
    enum { IDD = IDD_DIALOG1 };

protected:
    virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
    virtual BOOL OnInitDialog();
    afx_msg void OnSize(UINT nType, int cx, int cy);
    afx_msg void OnGetMinMaxInfo(MINMAXINFO *pMMI);
    afx_msg void OnOK();

    POINT m_MinSize;
    int m_ButtonSeparation;
    CDlg2 m_cDlg2;

    DECLARE_MESSAGE_MAP()
};

I changed it to:

class CDlg1 : public CDialog
{
    DECLARE_DYNAMIC(CDlg1)

public:
    CDlg1(CWnd* pParent = NULL); // standard constructor
    virtual ~CDlg1();

// Dialog Data
    enum { IDD = IDD_DIALOG1 };

protected:
    virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
    virtual BOOL OnInitDialog();
    afx_msg void OnSize(UINT nType, int cx, int cy);
    afx_msg void OnGetMinMaxInfo(MINMAXINFO *pMMI);
    afx_msg void OnOK();

    POINT m_MinSize;
    int m_ButtonSeparation;
   CDlg2 *m_pDlg2;

    DECLARE_MESSAGE_MAP()
};

and then later on:

void CDlg1::OnOK()
{
    m_pDlg2 = new CDlg2;

   if (m_pDlg2)
   {
         m_pDlg2->DoModal();

         delete m_pDlg2;
    }
}


Priya:

Normally, a modal dialog just uses a local stack variable. There is no need to
use a member variable (pointer or non-pointer).

void CDlg1::OnOK()
{
   CDlg2 dlg;
   dlg.DoModal();
}

--
David Wilkinson
Visual C++ MVP

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