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, 27 Oct 2001 CPOL 161.4K 7.7K 65
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A CFormView derived class to implement resizable form views with MFC


This class handles resizable Form views and it's based on my ResizableLib class library (see article).

The user will have the ability to resize the Form, with consequent rearrangement of child windows. If the Form window gets smaller than its minimum size, it becomes scrollable like standard CFormView.

Conversion of a previously existant Form should be very simple, as well as creation of a new resizable dialog.

The Sample Applications

This is a view of the SDI application:

A SDI application with resizable Form View

This is a view of the MDI application:

A MDI application with resizable Form View

You may see how to do this in the next section.

Usage - Step by Step

Add the ResizableLib to your project's workspace, as explained in the relative article.

Create a standard Form view or take one you have already made which you want to be resizable.

Include 'ResizableFormView.h' in the associated header file.

Search and replace all CFormView occurrences with CResizableFormView in both your .cpp and .h files, just as if your dialog class was derived from CResizableFormView instead of CFormView. I think there's no way to let the Class Wizard do this for you. Let me know if I'm wrong, please.

Your header file should appear like this:

#include <span class="code-string">"ResizableFormView.h"</span>

class CMyFormView : public CResizableFormView
protected: // create from serialization only

// ( other stuff )
// ...

In your OnInitialUpdate override, add an anchor for each control you want the size and/or position to be changed when the user resizes the Form.

void CMyFormView::OnInitialUpdate()
    // must add controls to the layout
    // before OnInitialUpdate base implementation

    // complete initialization

    // these two lines are optional

You are ready to rebuild your project and you will have a resizable Form view just as you wanted.

For further details, see the next section.

Class Reference

This class inherits only from CResizableLayout and obviously from CFormView. It just needs basic resizing capabilities.


CResizableFormView(UINT nIDTemplate)
CResizableFormView(LPCTSTR lpszTemplateName)
These are needed to reproduce the construction scheme of a CFormView derived class. This is the reason why replacing one class with the other will work.


Implemented in the various base classes, see ResizableLib article.


Even this class is eventually integrated with ResizableLib. Many thanks to John Simmons for his first attempt to make resizable Form views and for pointing out the scrolling problem. To solve it I had to add more functionalities to CResizableLayout, that could be useful for other purposes.

The CVS tree is now on Source Forge.


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


About the Author

Paolo Messina
Software Developer RoboTech srl
Italy Italy
Paolo began programming at the age of 9 with a glorious 8086 and GW-BASIC, then he played a bit with C, ASM and Pascal. He tought himself MFC and Windows programming, to exploit his studies of C++. Always attracted by low-level programming and Assembly, he's beginning to appreciate the joys of templates and STL. At work he changed his mind about Java, discovered Eclipse IDE, and now think it's cool.

He lives in Follonica, Italy.

He has been abroad in the U.S. to work on his final thesis before graduating. For seven months he was playing with airplanes and automatic control at the Unversity of Illinois at Urbana-Champaign.

He graduated in Computer Science Engineering at the University of Pisa, Italy, in December 2003.

Currently working for an edutainment robotics company (

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Comments and Discussions

GeneralMy vote of 5 Pin
Cloudsy17-Jan-14 4:50
memberCloudsy17-Jan-14 4:50 
QuestionHow can I use Resizable Lib with CMDIFrameWndEx Pin
Member 4499645-Nov-13 23:11
memberMember 4499645-Nov-13 23:11 
Questionis it some problem with this project? Pin
batsword10-Sep-10 22:43
memberbatsword10-Sep-10 22:43 
Generalgreat, I need it Pin
Li Shu27-Oct-08 21:14
memberLi Shu27-Oct-08 21:14 
GeneralWorks with Ultimate tool and Grid Pin
mhorowit26-Sep-07 17:49
membermhorowit26-Sep-07 17:49 
QuestionHow to avoid flickering Pin
chen_zd7-Jun-07 17:41
memberchen_zd7-Jun-07 17:41 
AnswerRe: How to avoid flickering Pin
Paolo Messina7-Jun-07 22:50
memberPaolo Messina7-Jun-07 22:50 
GeneralRe: How to avoid flickering Pin
chen_zd8-Jun-07 6:03
memberchen_zd8-Jun-07 6:03 
GeneralGreat.It is just what I want.Thanks Pin
benben30-Jul-03 5:35
memberbenben30-Jul-03 5:35 
GeneralCResizableForm do not resize itself Pin
Anonymous18-May-03 18:26
sussAnonymous18-May-03 18:26 
GeneralRe: CResizableForm do not resize itself Pin
Paolo Messina19-May-03 6:04
memberPaolo Messina19-May-03 6:04 
GeneralProblems wiith windows media player activex Pin
Pedro Miranda13-May-03 1:28
sussPedro Miranda13-May-03 1:28 
GeneralRe: Problems wiith windows media player activex Pin
Paolo Messina14-May-03 10:46
memberPaolo Messina14-May-03 10:46 
GeneralRe: Problems wiith windows media player activex Pin
Pedro Miranda15-May-03 5:31
sussPedro Miranda15-May-03 5:31 
Hi Paolo,

First let me thank you for your reply and for your excellent work and specially for sharing it with us.

Now, lets get this fingers typing J

It does works if I ignore the assertion, but it keeps asserting in ArrangeLayoutCallback because in ArrangeLayout layout.hWnd == NULL and I do not have overridden ArrangeLayoutCallback.

This problem only appends if I in

void CMyFormView::OnInitialUpdate()

if instead I
void CMyFormView::OnInitialUpdate()

It works fine.

I’ve manage to find out why, after steeping into MFC code I discovered that although I have a instance of MyControl it does not have a Window associated with it, it’s in:

CFormView::OnInitialUpdateà CWnd::UpdateDataà CMyFormView::DoDataExchangeà:: DDX_Control that the Window is associated with my control by calling rControl.SubclassWindow(hWndCtrl).

My question is if there is no problem in calling AddAnchor after CResizableFormView::OnInitialUpdate and specially if I need to call CResizableFormView::ArrangeLayout() again after it.

Thank you

To anyone you sees this post.....Visit Italy, Paolo’s of the most beautiful country I had the pleasure of traveling.....with the most beautiful ladies on earth...........lucky Italians J

Pedro Miranda
GeneralRe: Problems wiith activex / Testing new version Pin
Paolo Messina15-May-03 9:35
memberPaolo Messina15-May-03 9:35 
GeneralExcellent Pin
JohnJ14-Mar-03 0:10
memberJohnJ14-Mar-03 0:10 
GeneralActiveX control behaviour during resizing Pin
shilon31-Jan-03 4:36
membershilon31-Jan-03 4:36 
GeneralRe: ActiveX control behaviour during resizing Pin
Paolo Messina31-Jan-03 12:32
memberPaolo Messina31-Jan-03 12:32 
GeneralRe: ActiveX control behaviour during resizing Pin
shilon1-Feb-03 1:31
membershilon1-Feb-03 1:31 
GeneralRe: ActiveX control behaviour during resizing Pin
Paolo Messina1-Feb-03 3:57
memberPaolo Messina1-Feb-03 3:57 
GeneralCResizableMinMax and CResizableFormView Pin
Matt Philmon23-Aug-01 17:03
memberMatt Philmon23-Aug-01 17:03 
GeneralRe: CResizableMinMax and CResizableFormView Pin
Paolo Messina24-Aug-01 0:38
memberPaolo Messina24-Aug-01 0:38 
Generalprobleme with VScroll Pin
bogdan25-Jul-01 23:07
memberbogdan25-Jul-01 23:07 
GeneralRe: probleme with VScroll Pin
Paolo Messina25-Jul-01 23:15
memberPaolo Messina25-Jul-01 23:15 
GeneralRe: probleme with VScroll Pin
haibiao1-Aug-03 6:45
susshaibiao1-Aug-03 6:45 
General<b>Just what I needed :) </b> Pin
Matt Newman16-Jul-01 8:01
memberMatt Newman16-Jul-01 8:01 

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