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  • Your email address will not be published.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

  • Learn How A Global Entertainment Company Saw a 448% ROI Every business today uses software to manage systems, deliver products, and empower employees to do their jobs. But software inevitably breaks, and when it does, businesses lose money -- in the form of dissatisfied customers, missed SLAs or lost productivity. PagerDuty, an operations performance platform, solves this problem by helping operations engineers and developers more effectively manage and resolve incidents across a company's global operations. …

  • Today's agile organizations pose operations teams with a tremendous challenge: to deploy new releases to production immediately after development and testing is completed. To ensure that applications are deployed successfully, an automatic and transparent process is required. We refer to this process as Zero Touch Deployment™. This white paper reviews two approaches to Zero Touch Deployment--a script-based solution and a release automation platform. The article discusses how each can solve the key …

Most Popular Programming Stories

More for Developers

RSS Feeds