cocoa-dev  

Re: NSTableView Drag-Drop re-ordering...

Michael Robinson
Wed, 26 Nov 2008 02:08:06 -0800

(I really did intend for this to reach the list, but I hurriedly pressed the "reply to sender" hotkey) 

Hi Jean-Nicolas

I too had a horrible time implementing this.

Below I've pasted the code that handles dnd re-ordering in my table.
Basically it just makes a copy of the dragged row, deletes it, then rebuilds the array, inserting the dragged row at its new index.
As I'm still new to ObjC, so I can't really go into details on how it works - but if you're like me then all you need is a working example! 

#define MyPrivateTableViewDataType @"NSMutableDictionary"

- (void)awakeFromNib {
[table registerForDraggedTypes:[NSArray arrayWithObject:MyPrivateTableViewDataType]]; 
}
//I'm not actually sure if this method is required... Like I said, I'm new to ObjC! - (BOOL)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard*)pboard 
{
 // Copy the row numbers to the pasteboard.
 NSData *data = [NSKeyedArchiver archivedDataWithRootObject:rowIndexes];
[pboard declareTypes:[NSArray arrayWithObject:MyPrivateTableViewDataType] owner:controller]; 
 [pboard setData:data forType:MyPrivateTableViewDataType];
 return YES;
}
- (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(int)row proposedDropOperation:(NSTableViewDropOperation)op 
{
 // Add code here to validate the drop
 NSLog(@"validate Drop");
 return NSDragOperationEvery;
}
- (BOOL)tableView:(NSTableView *)aTableView acceptDrop:(id <NSDraggingInfo>)info row:(int)to dropOperation:(NSTableViewDropOperation)operation 
{
//this is the code that handles dnd ordering - my table doesn't need to accept drops from outside! Hooray! 
 NSPasteboard* pboard = [info draggingPasteboard];
 NSData* rowData = [pboard dataForType:MyPrivateTableViewDataType];
NSIndexSet* rowIndexes = [NSKeyedUnarchiver unarchiveObjectWithData:rowData]; 
 int from = [rowIndexes firstIndex];
NSMutableDictionary *traveller = [[controller arrangedObjects] objectAtIndex:from]; 
 [traveller retain];
   int length = [[controller arrangedObjects] count];
   NSMutableArray *replacement = [NSMutableArray new];

   int i;
 for (i = 0; i <= length; i++){
       if(i == to){
         if(from > to){
         [controller insertObject:traveller atArrangedObjectIndex:to];
         [controller removeObjectAtArrangedObjectIndex:from+1];
         }
         else{
             [controller insertObject:traveller atArrangedObjectIndex:to];
             [controller removeObjectAtArrangedObjectIndex:from];
         }
     }
   }
}


Jean-Nicolas Jolivet wrote:
<div class="moz-text-flowed" style="font-family: -moz-fixed">I'm pretty sure this has been covered before, however I can't find any good examples on how to implement it??
Right now my NSTableView is hooked to a subclass of NSArrayController, and it supports files getting dropped on it.. (basically the NSTableView displays files dropped from the finder)... that part works well, however, now I would like to implement drag/drop re-ordering of rows... 

Any good examples on how to do that?


Jean-Nicolas Jolivet
[EMAIL PROTECTED]
http://www.silverscripting.com


</div>


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