Preventing editing item labels in tree view


This article was contributed by Marius Bakelis.

If we have created tree view control with the TVS_EDITLABELS style we can edit all its items labels. But sometimes we do need that not all tree view control items labels could be editable. So we must prevent editing of item labels we don't want to be editable. We can override the PreTranslateMessage() function:



BOOL CTreeCtrlX::PreTranslateMessage(MSG* pMsg) 
{
    if( pMsg->message == WM_LBUTTONDOWN )
    {
		UINT		flag = TVHT_ONITEMLABEL;
		CPoint		pt = pMsg->pt;

		ScreenToClient(&pt);
		
		if( HitTest( pt, &flag ) == GetSelectedItem() 
			// && there you can check is the item which cannot be editable
			)
		{
			SetFocus();	//We must set focus to the tree view control
					//becouse it can have no focus

			return TRUE ;   // DO NOT process further
		}
    }

    return CTreeCtrl::PreTranslateMessage(pMsg);
}




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    Reply
  • Preventing editing item labels in tree view

    Posted by Legacy on 08/05/1999 12:00am

    Originally posted by: Chris Grieve

    This was a great help but it has a tiny buggette in the way that HitTest is used which stops you D&D ing something by the icon that is already selected. This is the correction;
    
    

    As before except;

    UINT flag = 0;


    if( ( ( tree.HitTest( pt, &flag ) == tree.GetSelectedItem()
    &&( flag & TVHT_ONITEMLABEL ) ) // new bit
    && ( FALSE ) ) // your check in here

    But I wouldn't have got this far without the original code(!)

    Thanks

    Chris

    Reply
  • Why not handle TVN_BEGINLABELEDIT notification?

    Posted by Legacy on 01/16/1999 12:00am

    Originally posted by: Peter Schregle

    A more straightforward way to inhibit label editing would be to handle the TVM_BEGINLABELEDIT notification. Return FALSE to allow and TRUE to cancel label editing.

    Reply
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