Handling Title Tips With Drag/Drop Headers Using The Visual C++ 6.0 CListCtrl

I wanted to add the title-tip class to the new version of the CListCtrl in Visual C++ 6.0. However, as has previously been pointed out on this site, the code doesn't quite work for a List Control with the LVS_EX_HEADERDRAGDROP style enabled. The code fix previously posted is more complicated than neccessary with the new CListCtrl class in VC 6, and I was able to modify Zafir Anjum's CellRectFromPoint() function to handle all header cases simply. Just modify the CellRectFromPoint() code to look like the following:


int CTRListCtrl::CellRectFromPoint(CPoint & point, RECT * cellrect, int * col) 
{	
	int colnum;	
	
	// Make sure that the ListView is in LVS_REPORT
	if( (GetStyle() & LVS_TYPEMASK) != LVS_REPORT )		
		return -1;
	
	// Get the top and bottom row visible	
	int row = GetTopIndex();
	int bottom = row + GetCountPerPage();	
	if( bottom > GetItemCount() )
		bottom = GetItemCount();		
		
	// Get the number of columns
	CHeaderCtrl* pHeader = CListCtrl::GetHeaderCtrl();
	int nColumnCount = pHeader->GetItemCount();	
	
	// Loop through the visible rows
	for( ;row <= bottom; row++)	
	{
		// Get bounding rect of item and check whether point falls in it.		
		CRect rect;
		GetItemRect( row, &rect, LVIR_BOUNDS );		

		// We use the rects of the header items to determine if the point falls in a
		// given column. Thus, the order of the columns is no longer important.

		CRect colRect;
		
		if( rect.PtInRect(point) )		
		{
			// Now find the column			
			for( colnum = 0; colnum < nColumnCount; colnum++ )
			{				
				pHeader->GetItemRect(colnum, &colRect);
									
				if(  (point.x >= colRect.left) && (point.x <= (colRect.left + colRect.Width()) ) )
				{					
					// Found the column
					RECT rectClient;					
					GetClientRect( &rectClient );
					if( point.x > rectClient.right )						
						return -1;					
						
					if( col ) 
						*col = colnum;					
						
					rect.right = colRect.left + colRect.Width();
					rect.left = colRect.left;

					if( rect.right > rectClient.right ) 						
						rect.right = rectClient.right;
					
					*cellrect = rect;					
					return row;				
				}				
			}		
		}	
	}
	return -1;
}




Comments

  • There are no comments yet. Be the first to comment!

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • On-demand Event You can scale your mobile apps' data throughput and storage elastically with a fully managed, planet-scale NoSQL database service built for fast and predictable performance, high availability, elastic scaling, global distribution, and ease of development. This 40-minute on-demand webinar will demonstrate the scalability of DocumentDB and explore how the MongoDB API for DocumentDB, along with Xamarin, can simplify mobile application development for your organization. About Azure …

  • On-demand EventEvent Date: March 21, 2017 With the rise in ransomware attacks, bank heists that reached new levels of sophistication, and extortion plots that were beyond anything we could have imagined, 2016 certainly was an eventful year for cybersecurity. Going into 2017, no business can afford to be uninformed about cybersecurity or unprepared for an attack. Watch this informative webinar, presented by Andrey Pozhogin, Senior B2B Product Marketing Manager at Kaspersky Lab, as he examines predictions for …

Most Popular Programming Stories

More for Developers

RSS Feeds

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