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Child Dialog (Sub Forms)

By , 17 Nov 1999
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ChildDlg1.gif

ChildDlg1.gif

Introduction

A simple class for handling Child Dialogs within a dialog or property sheet. These Child Dialogs can be changed on the fly, much like subforms. It's a simple task really, but I got tired of programming everything every time Frown | :-(

Step 1. Design one or several 'Subdialogs'. Make sure to set the Style to Child and to tick the property 'Control'.

Step 2. Design a Parent Dialog. To make things easier, I add a static control for easier positioning of the child dialogs (normally I use a group frame).

Step 3. Generate for all dialogs, their classes.

Step 4. Add the files SubFormCollection.cpp and SubFormCollection.h to your project.

Step 5. Create an object of the class CSubFormCollection to the parent dialog.

 //
    CSubFormCollection m_SubForms;
 //

Step 6. In the OnInitDialog() method of the parent class, add the code below:

 //
    CRect r;
    // get the position for the subforms
    (GetDlgItem(IDC_SUBFORM_FRAME))->GetWindowRect(&r);
    // if the positioning is absolute use this, else the next line
    //    m_SubForms.SetRelPos(r);
    // centers the subdialog within the static IDC_SUBFORM_FRAME
    m_SubForms.SetCenterPos(r);
    m_SubForms.CreateSubForm(IDD_SUBFORM1,this); // create the sub forms
    m_SubForms.CreateSubForm(IDD_SUBFORM2,this);
    m_SubForms.CreateSubForm(IDD_SUBFORM3,this);
    m_SubForms.CreateSubForm(IDD_SUBFORM4,this);
    m_SubForms.ShowSubForm(); // show the first one
 //

Step 7. To switch between the subdialogs, use the code below:

 //
    m_SubForms.ShowSubForm(index_of_subform);
 //

Now the big work starts...

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Daniel Zuppinger
Chief Technology Officer
Switzerland Switzerland
Professional IT developer since 1983. First projects with Cobol, then Pascal, Modula2, C and since Visual C++ 1.0 also with C++. Works since 1986 as Consultant, between 1990 and 2008 for Infobrain in Switzerland, currently employed by enValue (also Switzerland).
Current field is the project management and development of software for Bank applications.
Married, two daughters, Hobbies : Paragliding, Orienteering, Mountainbiking, Photography

Comments and Discussions

 
GeneralHandling Windows messages PinsussMatt Soler17-Apr-00 11:31 
GeneralRe: Handling Windows messages PinsussDaniel Zuppinger17-Apr-00 19:22 
Sorry, but my code contains a error and I have not had the time to fix it. The problem is that you need to construct the CDialogs with new and then pass them to my class. e.g. :
(Code taken from a response I got from Jason Wilden)
 
bool CSubDlgCollection::CreateSubForm(CDialog *pDlg,UINT id, CWnd* pParentWnd)
{
ASSERT(pDlg != NULL);
if (pDlg == NULL) return(false);
 
// exit and tell the world about it
AddForm(pDlg); // Add it to the internal table
 
// Now create the dialog
pDlg->Create(id,pParentWnd);
 
....
}
 
The destructor also needs some modification:
 
CSubDlgCollection::~CSubDlgCollection()
{
// Free all sub forms on destruction
for (int i = 0; i <= m_Forms.GetUpperBound(); i++) {
CDialog* pDlg = m_Forms.GetAt(i);
pDlg->DestroyWindow();
}
}
 
The modified class is then used as follows :
 
CDlgNewProjectGroups *pDlg = new CDlgNewProjectGroups;
 
pDlg->m_bIncludeAllGroups = TRUE;
m_SubForms.CreateSubForm(pDlg,IDD_NEW_PROJECT_GROUPS,this); // create the sub forms
 
CDlgNewProjectSettings *pDlg2 = new CDlgNewProjectSettings;
m_SubForms.CreateSubForm (pDlg2,IDD_NEW_PROJECT_SETTINGS,this); // create
the sub forms
 
m_SubForms.ShowSubForm(); // show the first one
 
Regards Danie
GeneralRe: Handling Windows messages PinsussBo Su27-Jul-00 15:39 
GeneralRe: Handling Windows messages Pinmemberehomebuilder5-Feb-04 16:25 

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