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Disable CTabCtrl tab items in WTL - Using the Owner Drawn Method

, 17 Jul 2002
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A port of Paul Dilascia MFC CTabCtrlWithDisable to WTL
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Sample Image - atldisabledtabctrl.jpg

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Introduction

I needed a tab control that would allow me to enable and disable certain tab items, I did a search and came across the Paul Dilascia CTabCtrlWithDisable article. This was exactly what I required except that it was written in MFC. This article basically convert his code to WTL.

For more infomation on Paul Dilascia original article see here

Requirements

You will require the WTL Libraries, these can be downloaded from the Microsoft site. There are various articles on the net that tell you how to do this, so I won't bore you with the details.

How to use the control in your WTL App

  1. Add the header file atlTabCtrlWithDisable.h to the Dialogs source code that will be using the control. The control class name is CTabCtrlWithDisable. You will also need to add atlmisc.h in your stdafx.h file.
  2. You will need to override the base class CTabCtrlWithDisable and set the pure virtual function IsTabEnabled e.g.
  3. class CMyTabCtrlWithDisable : public CTabCtrlWithDisable 
    { 
    public: 
       BOOL IsTabEnabled(int nTab) 
       { 
          return (nTab !=2);
       }
    };
    

    Note - The isTabEnabled function determines which Tab gets disabled

    More information on the design of this class - see original article

  4. Instantiate the class and Subclass the control in the OnInitDialog function e.g.
  5.        
    CString sBuff;
    m_ctlTab.SubclassDlgItem(IDC_TAB1, *this); 
    TCITEM item = { 0 }; 
    item.mask = TCIF_TEXT; 
    sBuff = _T("Tab 1"); 
    item.pszText = sBuff.GetBuffer(sBuff.GetLength()); 
    sBuff.ReleaseBuffer(sBuff.GetLength()); 
    m_ctlTab.InsertItem(0, &item); 
    sBuff = _T("Tab 2"); 
    item.pszText = sBuff.GetBuffer(sBuff.GetLength()); 
    sBuff.ReleaseBuffer(sBuff.GetLength()); 
    m_ctlTab.InsertItem(1, &item); 
    sBuff = _T("Tab 3"); 
    item.pszText = sBuff.GetBuffer(sBuff.GetLength()); 
    sBuff.ReleaseBuffer(sBuff.GetLength()); 
    m_ctlTab.InsertItem(2, &item); 
    sBuff = _T("Tab 4"); 
    item.pszText = sBuff.GetBuffer(sBuff.GetLength()); 
    sBuff.ReleaseBuffer(sBuff.GetLength()); 
    m_ctlTab.InsertItem(2, &item); 
    sBuff = _T("Tab 5"); 
    item.pszText = sBuff.GetBuffer(sBuff.GetLength()); 
    sBuff.ReleaseBuffer(sBuff.GetLength()); 
    m_ctlTab.InsertItem(2, &item); 
    m_ctlTab.InitTabStatus();       
  6. Call InitTabStatus method. Note the call to InitTabStatus, this function is called after inserting the tab items, and it basically does a check on the status of the tab items to see if any tab items need disabling.
  7. Add REFLECT_NOTIFICATIONS() to the end of the message map from your calling class.

That's it!!!

The Demo App shows how to use the control on a WTL dialog class.

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

Rashid Thadha
Web Developer
United Kingdom United Kingdom
Was made redundant in early 2003 after 10 years in computer programming, since then started my own business (selling computer books on the net)
www.pricecutbook.co.uk
 

Comments and Discussions

 
GeneralUse in MFC Pinmemberbreak;18-Oct-06 1:10 
GeneralUse TCS_VERTICAL style PinsussAsha Udupa21-Apr-05 19:48 
GeneralUpdate - DrawItem function PinmemberRashid Thadha15-Aug-02 0:59 

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