Select the product you need help with
- Internet Explorer
- Windows Phone
- More products
How to use the CFormView class in single document interface (SDI) and multiple document interface (MDI) applications
Article ID: 98598 - View products that this article applies to.
This article was previously published under Q98598
Note Microsoft Visual C++ .NET (2002) supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.
Note Microsoft Visual C++ 2005 supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model.
The CFormView class provides a convenient method to place controls into a view that is based on a dialog box template. The general procedure to use a CFormView is described in the documentation for the class and is illustrated in the VIEWEX and CHKBOOK sample applications provided with Microsoft Foundation Classes (MFC) versions 2.x and above. However, these applications do not demonstrate making the initial size of the frame window to be the same as the initial size of the form.
The following section lists the steps required to support creating a single document interface (SDI) or multiple document interface (MDI) application based on a CFormView, sizing the initial frame window around the form, changing the style of the frame, and closing an MDI document using a button in the form.
The following steps describe how to create an MFC AppWizard application using the CFormView as the default view:
Changing the Size of an SDI Main Frame Around a CFormViewTo change the size of the main frame of an SDI application (that uses CFormView as its view class) to be the appropriate size for the form you designed in App Studio, override the OnInitialUpdate() function in your class derived from CFormView, as follows:
The ResizeParentToFit() function does not prevent the form from changing size when the user changes the size of the application main frame (scroll bars are added automatically if needed). To modify the style of the frame window that is the parent of a form view, you can override the PreCreateWindow() function in the CMainFrame class generated by AppWizard. For example, to remove the WS_THICKFRAME style and prevent the user from changing the size of the window, declare PreCreateWindow() in MAINFRM.H and add the following code to MAINFRM.CPP:
Changing the Size of an MDI Child Frame Around a CFormViewThe process of changing the size of an MDI child frame is similar to changing the size of a main frame for an SDI application, as explained above. However, the RecalcLayout() call is not required.
To change the size of an MDI child frame around a form view, override the OnInitialUpdate() function in your class derived from CFormView as follows:
If the application overrides the default argument to the ResizeParentToFit() function, essentially the same consequences occur as for an SDI application, as explained above. In addition, the child window may be too large for the enclosing MDI main frame or for the entire screen.
To change the style of the MDI child frame (for example, to remove the WS_THICKFRAME style so the user cannot change the size of the window), derive an MDI child window class and override the PreCreateWindow function as demonstrated in the SDI example above.
Closing an MDI Form with a ButtonTo create a button on a form that closes the document add a message handler for the BN_CLICKED message to the CFormView class. Make sure that the buttons in CFormView do not have the default IDOK or IDCANCEL identifiers. If they do, then incorrect entries in the message map and incorrect functions for the buttons will be created.
Once the message handler is in place, you can simulate the Close command on the File menu with the following code:
This method to close a form prompts the user to save the file if the IsModified() member function associated with the document returns TRUE.
Article ID: 98598 - Last Review: January 5, 2006 - Revision: 4.0