Click here to Skip to main content
Click here to Skip to main content

Centralizing modeless child dialog

, 18 Apr 2009
Rate this:
Please Sign up or sign in to vote.
Describes how to display a modeless child dialog at the center of the parent dialog.
Normally when we call the DoModal() function of a dialog, the dialog will created and displayed at the center of the parent dialog.



But when a modless dialog is displayed, the child dialog will be displayed at the top left portion of the parent dialog.



I noticed this when a codeproject user asked how to centralize a modeless child dialog. Initially I thought that MFC might be doing some thing in the DoModal() function. So I stepped into the DoModal() function. But I couldn't find any difference in the dialog creation in CDialog::DoModal and CDialog::Create().
Another difference that I know between a modal and modeless dialog is that, in the case of the modal dialog, the parent window will be disabled. MFC does this inside the DoModal() function. To try my luck I disabled the parent window before calling the Create function of dialog. Surprisingly it worked! The modeless child dialog came at the center of parent dialog.

So if you want to centralize a modeless dialog, just disable the parent dialog before create and re-enable it after the creation.
void CDialogBased2Dlg::OnBnClickedButton1()
{
    EnableWindow( FALSE );
    m_ChildDlg.Create( ChildDialog::IDD, this );
    EnableWindow( TRUE );
    m_ChildDlg.ShowWindow( SW_SHOW );
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Naveen
Software Developer (Senior)
Singapore Singapore
No Biography provided

Comments and Discussions

 
-- There are no messages in this forum --
| Advertise | Privacy | Mobile
Web03 | 2.8.140721.1 | Last Updated 19 Apr 2009
Article Copyright 2009 by Naveen
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid