Preventing editing item labels in tree view

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >


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);
}




Comments

  • 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
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Microsoft Azure® is a leading choice for businesses looking to take advantage of the cloud. Azure is particularly appealing to businesses that have already invested in Microsoft on-premises and are now considering running these applications and other workloads in the cloud. To understand how to make this move to Azure, many businesses are turning to managed service providers (MSPs) with specific Azure expertise. Read this white paper to learn the eight key areas to focus on when considering an MSP for an …

  • Many enterprises are working with an IT architecture that's evolved over time. As business needs evolve, IT must decide whether to modernize incrementally, or all at once. Each approach has its benefits and drawbacks. Identity Management is key to modernizing IT; it plays a crucial role in migrating to cloud apps like Office 365 or HR information systems, building web and mobile apps, and opening developer access to business systems. Read how Okta's modern approach to identity management helps business lower …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date