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  • Your email address will not be published.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

  • The impact of a data loss event can be significant. Real-time data is essential to remaining competitive. Many companies can no longer afford to rely on a truck arriving each day to take backup tapes offsite. For most companies, a cloud backup and recovery solution will eliminate, or significantly reduce, IT resources related to the mundane task of backup and allow your resources to be redeployed to more strategic projects. The cloud - can now be comfortable for you – with 100% recovery from anywhere all …

  • On-demand Event Event Date: April 22, 2014 Database professionals -- whether developers or DBAs -- can often save valuable time by learning to get the most from their new or existing productivity tools. Whether you're responsible for managing database projects, performing database health checks and reporting, analyzing code, or measuring software engineering metrics, it's likely you're not taking advantage of some of the lesser-known features of Toad from Dell. Attend this eSeminar with Dell Software's …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds