MFC Dialog: How to set the initial position of a modal dialog?
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    MFC Dialog: How to set the initial position of a modal dialog?

    Q: How to set the initial position of a modal dialog?

    A: There are at least two possible answers to this question. Both answers I will provide here handles the WM_INITDIALOG message.

    First add a handler for the WM_INITDIALOG message to your dialog box class (this can for instance be done by using the ClassWizzard if you use a a version of VC++ prior to VC++ 2002). The message handling function for a WM_INITDIALOG message is the OnInitDialog function.

    The following implementation positions the dialog at the screen coordinates x,y inside the dialog class itself:
    Code:
    BOOL CYourDlg::OnInitDialog()
    {
         CDialog::OnInitDialog();
         // Calculate your x and y coordinates of the upper-left corner 
         // of the dialog (in screen coordinates) based on some logic
    
         SetWindowPos(NULL, x, y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
    
         return TRUE;
    }
    Another possibility is to set the position when you create the dialog. To achieve this you have to add a public CPoint member variable to your dialog. This variable will hold the dialog's initial position.

    Code:
    class CYourDialog : public CDialog
    {
         public:
              CPoint m_point;
         //....
    };
    Then you use almost the same implementation of the OnInitDialog as above. The only difference is that you use the x and y coordinates from m_point.

    Code:
    BOOL CYourDlg::OnInitDialog()
    
         CDialog::OnInitDialog();
       
         SetWindowPos(NULL, m_point.x, m_point.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
    
         return TRUE;
    }
    Now, when you create the dialog you set the m_point member to what suits you:

    Code:
         //Calculate x and y (screen coordinates)
         int x = ...;
         int y = ...;
    
         CYourDialog dlg;
         dlg.m_point = CPoint( x , y ); 
    
         if(dlg:DoModal() == IDOK)
         {
              //...
         }
         else
         {
              //...
         }
    Last edited by cilu; February 4th, 2007 at 10:29 AM.

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