SAMPLE: Horizontal Scrolling List Box in an MFC Class

ID: Q146437

The information in this article applies to:

SUMMARY

The HLISTBOX sample contained in HLISTBOX.EXE illustrates how to implement horizontal scrolling in a CListBox-derived class.

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

~ Hlistbox.exe
For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:
Q119591 How to Obtain Microsoft Support Files from Online Services
NOTE: Use the -d option when running HLISTBOX.EXE to decompress the file and recreate the proper directory structure.


MORE INFORMATION

HLISTBOX implements a new class called CHorzListBox that is derived from CListBox. This new class automatically updates the horizontal extent of a list box to that of the longest string included in the list box. It works well with list boxes that have or don't have the LBS_USETABSTOPS style. An ordinary Windows list box does not attempt to implement horizontal scrolling of this nature.

Basically, the CHorzListBox intercepts all messages that would affect the horizontal extent based on the string lengths. It tracks the extent of all strings in the list box through an array. Examine the source code for details. 


Sample Files    Descriptions
------------------------------------------------------------------------

HLB.CPP         Implementation of the CHorzListBox class.

HLISTBOX.CPP    Application, mostly AppWizard generated dialog-based
                application.

HLISTDLG.CPP    Implementation of the test dialog. Also the
                application's main window.
NOTE: The "Lock/Unlock" button on the main dialog locks and unlocks the automatic updating of horizontal extent for the list box.

Additional query words: 4.00 scroll bar scrollbar listbox 


Keywords          : kbsample kbMFC KbUIDesign kbVC 
Version           : 4.00
Platform          : NT WINDOWS 
Issue type        :

Last Reviewed: July 22, 1999