On May 18, 2009, at 10:15 PM, Bright wrote:
Hi ,this is my code,but the code can not limit the file to Audio
file :
- (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id
<NSDraggingInfo>)info proposedRow:(int)row proposedDropOperation:
(NSTableViewDropOperation)op
{
? ? [tv setDropRow:[tv numberOfRows]
dropOperation:NSTableViewDropAbove];
? ? returnNSTableViewDropAbove;
}
That might be because you didn't actually do anything in this method.
Here you need to check the dragging pasteboard via the NSDraggingInfo
protocol object to see if it has a pasteboard you can read (which
might be overly pedantic, but I'd do it anyway), and if it does, then
you need to read it and check to see if the file path(s) in the
pasteboard is/are valid, and if so, then you need to check the UTIs of
each file to see if one identifies as an audio file as suggested
earlier. If all of these are good, then you set the drop row to row
(not -numberOfRows unless you really need it to go at the end), and
return the appropriate NSDragOperation (not NSTableViewDropAbove,
which is not an NSDragOperation). Otherwise, you return
NSDragOperationNone.
That's what you need to do. Implementation is now an exercise for the
reader. :)
Nick Zitzmann
<http://www.chronosnet.com/>
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