SAMPLE: Replacing a View in a Splitter Window

 Last reviewed: September 18, 1997
Article ID: Q102827

The information in this article applies to:
  • The Microsoft Foundation Classes (MFC), included with: 

        - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, 1.52
    - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1, 4.0, 4.1

SUMMARY

The SPLIT sample demonstrates the following Foundation Class programming concepts:

  1. A ReplaceView() function can be created which replaces a view in a CSplitterWnd pane with another. The function replaces a view but uses the same CDocument object. This function can be helpful if a programmer wants to keep the same frame window and document for a splitter pane and only wants to delete a view in a pane and replace it with another.

  2. The CDocument variable m_bAutoDelete can be used to prevent the destruction of a CDocument object if all views of the document are destroyed.

  3. The CWnd::PreCreateWindow() function can be used to prevent the main application from having a thick frame thus preventing the user from resizing the main application window.

  4. By trapping the WM_SETCURSOR, WM_MOUSEMOVE, and WM_LBUTTONDOWN messages of a CSplitterWnd, you can fix the splitter bars in a splitter window so that they can't be moved by the user.

  5. CSplitterWnd panes can contain regular CWnd objects and are not limited to the use of CViews. This sample places a dialog in the first pane.

  6. The undocumented CWnd::CenterWindow() can be used to position windows at the center of the screen.

The following file is available for download from the Microsoft Software Library: 

 ~ Split.exe (size: 35858 bytes)
For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from
               Online Services
NOTE: Use the -d option when running SPLIT.EXE to decompress the file to re-create the proper directory structure.

MORE INFORMATION

To understand what the sample does, first execute the program. You will see a main application window with a splitter window (CSplitterWnd) in its client area. A selection dialog will be displayed in the first pane and a view will be displayed in the second pane.

Click on the "View 1" and "View 2" buttons. Notice that the view in the second pane will switch from one to the other. The view is changing but looking at the source you'll see that the document stays the same.

The sample project can be converted to a 32-bit Visual C++ 2.x project and will successfully compile and execute once the following change has been made:

On line 34 of SPLITTER.CPP, change: 

   ::SetWindowWord
   GWW_ID
to: 

   ::SetWindowLong
   GWL_ID
If you have comments or suggestions about how to improve this sample, please send Microsoft a message to the MFC section of the MSLANG forum.

Additional query words: split splitter sample
Keywords : MfcDocView kbfile kbsample kbfasttip
Technology : kbmfc
Version : 1.0 1.5 1.51 1.52 2.0 2.1 4.0 4.
Platform : NT WINDOWS
Solution Type : kbfile

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Last reviewed: September 18, 1997
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