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  • Your email address will not be published.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

  • Savvy enterprises are discovering that the cloud holds the power to transform IT processes and support business objectives. IT departments can use the cloud to redefine the continuum of development and operations—a process that is becoming known as DevOps. Download the Executive Brief DevOps: Why IT Operations Managers Should Care About the Cloud—prepared by Frost & Sullivan and sponsored by IBM—to learn how IBM SmartCloud Application services provide a robust platform that streamlines …

  • Live Event Date: July 22, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT In this WhatWorks analysis, John Pescatore examines a use case where end users had local administrative rights on their PCs and it had gotten out of hand for this Fortune 500 Energy and Utilities company. The compelling event that prompted the company to reexamine this situation was the migration to Windows 7. In Windows XP, a custom tool that allowed users one of three levels of administrative rights to their workstations would need to be …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds