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Expanding and collapsing Dialogs

, 9 Jan 2000 CPOL
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This article gives you the ability to make your dialogs expand or contract, depending on how much information the user wishes to view.

Dialog in collapsed state

Dialog in expanded state

Sometimes it may be useful to show only the important part in a dialog and have a button usually labeled "More" that expands the dialog when the user clicks on it. Once the dialog is expanded, the "More" button displays "Less" and as soon as the user clicks on the "Less" button, the dialog will shrink to its initial size.

The CExpandDialog class performs this for you. All you have to to is add the DialogExpander.cpp file to your project and make some minor changes in your dialog class and template.

Modify the header file of your dialog class like this:

// CExpandDialogDlg dialog

#include "DialogExpander.h"    //<<<< add here

class CExpandDialogDlg : public CDialog
    CExpandDialog m_ExpandDialog ;    //<<<< add here

Modify the OnInitDialog function dialog class like this:

BOOL CExpandDialogDlg::OnInitDialog()

    m_ExpandDialog.Initialize(this, FALSE, IDC_MOREBUTTON, 
                    IDC_LESSTEXT) ; //<<<< add here


With the class wizard, add a handler for the "More" button (e.g. OnMore()) and modify it like this:

void CExpandDialogDlg::OnMore() 
    m_ExpandDialog.OnExpandButton() ;

The dialog template must include two special static controls. One that indicates the position of the bottom of the dialog when it is in the collapsed state (1 on the legend below) and one that contains the string that should appear on the "More/Less" button when the dialog is in the expanded state (2 on the legend below). These two controls will not be shown because the CExpandDialog class will hide them automatically.

Dialog template


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


About the Author

Michael Walz
Switzerland Switzerland
No Biography provided

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Comments and Discussions

GeneralMy vote of 4 Pin
Adi Shavit14-Dec-11 0:50
memberAdi Shavit14-Dec-11 0:50 
Great class. Very easy to use. Article could use a bit more details such as explaining the actual IDs of the hidden labels and correcting what appear to be small errors in the examples.

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