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An Enhanced CCheckComboBox

, 10 Dec 2002
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hybrid control simulating a combo box with checkboxes on a dropdown tree
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Sample Image - CheckCmb.gif

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Introduction

I wanted a control with both the functionality of a combo and of a tree with checkboxes. Such a control would act like a combo showing a dropdown and also allowing checking and fast checking items.

By the time I finished coding I saw Magnus Egelberg's "CCheckComboBox" class, but I realize that my control has several advantages which anyway would had required the class to be completely rewrote.

My implementation (of a check list dropdown) is different from other implementations I seen, using a child, and not a popup window. Also for a better generality I use a tree, letting user see the checked items, by showing them in an edit box with a tool tip. I simulated a combo box by using an owner draw button, thus not directly deriving it from CWnd or CComboBox. I think this approach has several advantages.

To integrate these classes in a new project you would have to:

  1. Add the files "Check*" to your project
  2. On your form add a button with owner draw style and map it to a control
  3. Change the name of the mapped control to "CCheckComboBox"

To add an item you have to specify a caption, an ID and a level. The root has the level 0 (ROOT_LEVEL). All other nodes must be added with levels greater than 0 (ROOT_LEVEL), in the order in which they appear in the full-expanded tree. At any time you can use the function "GetCheckedIDs" to get a string with all checked item's IDs on the highest level of the tree. It is also possible to get the checked IDs using the function "GetCheck".

// ADD tree items:
m_choCountries.AddString("North America");
    m_choCountries.AddString("USA",    5, ROOT_LEVEL + 2);
    m_choCountries.AddString("Canada", 6, ROOT_LEVEL + 2);
    m_choCountries.AddString("Europe");
    m_choCountries.AddString("UK",     7, ROOT_LEVEL + 2);

// CHECK all items
m_choCountries.CheckAll(TRUE);

// UNCHECK the item with ID = 6
m_choCountries.SetCheck(6, FALSE);

// GET all checked items
CString strCheckedItems = m_choCountries.GetCheckedIDs();

Any suggestions to improve this set of classes are welcome.

History

  • 6 June 2002 - I let CTreeView alone interpret user keys, and introduced the OnGetDlgCode function for the combo.
  • 11 Dec 2002 - In this update I fixed 2 bugs and I added a functionality.

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

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About the Author

Magerusan Grigore Cosmin
Web Developer
Romania Romania
In June 2002 Magerusan Grigore Cosmin, took a Master's Degree in Computer Science at UBB University in Cluj.
 
He has ~2 years of experience using in VC++.

Comments and Discussions

 
QuestionCan u have the edit function PinmemberMember 1015708815-Jul-13 19:57 
QuestionI added "afx_msg void OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult);" to CCheckTreeCtrl,but no any effect Pinmemberpaniclp10-Jan-12 15:45 
QuestionHow can i use your Control in a CToolBar? PinmemberBigJorgos30-May-08 9:40 
QuestionHow to update parent control PinmemberJohannes P. Hansen1-Nov-07 23:44 
GeneralCheckBoxes PinmemberPandele Florin23-Aug-05 5:26 
GeneralA tip to update text whenever we have to DeleteString(nIndex). PinmemberScott M.G. Su6-Jul-05 23:00 
GeneralAdd Mouse Wheel Scrolling Support Pinmemberxzackely10-Dec-03 4:14 
QuestionVC++ 2003? PinmemberStefan Dahlin15-Sep-03 7:47 
AnswerRe: VC++ 2003? PinmemberStefan Dahlin16-Sep-03 0:30 
GeneralMinor improvements PinsussGöran Lundberg30-Mar-03 20:59 
GeneralGood, but BIG PROBLEM!!! Pinmemberoleg_cherkasenko15-Mar-03 6:25 
GeneralToolTip PinmemberBrad Bruce22-Feb-03 9:29 
GeneralWell done ! PinsussAnonymous12-Dec-02 3:24 
GeneralNew update available PinmemberMagerusan Grigore Cosmin11-Dec-02 20:51 
GeneralLooks not bad! PinmemberPhilip Patrick12-Aug-02 11:00 
GeneralBUG: Could not check, if item level decreases. PinmemberIsmail PAZARBASI19-Jun-02 14:56 
GeneralBug PinmemberBoris Ilijic19-Jun-02 6:57 
GeneralVery Good!! PinmemberWREY10-Jun-02 10:40 

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