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

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Date: 1/31/2018 @ 2 p.m. ET

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;
}




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