Hi All,
I was playing around with dragging items into NSTableView and I ran into a
interesting problem. When I drag an item into my table, the following delegate
gets called.
- (BOOL)tableView:(NSTableView *)tableView acceptDrop:(id<NSDraggingInfo>)info
row:(NSInteger)row dropOperation:(NSTableViewDropOperation)dropOperation {
[self performInsertWithDragInfo:info row:row];
return YES;
}
Since I am returning YES, we are accepting this drop. In
"performInsertWithDragInfo", I have a requirement to save the new add into a
file and then parse through NSArray which is my data source and might make some
modifications. After the modifications, I reload the datasource and repopulate
the tableview.
[_tableContents removeAllObjects];
for (NSString *fileStr in filtered) {
NSURL *fileURL = [NSURL URLWithString:[fileStr
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
DesktopEntity *entity = [DesktopEntity entityForURL:fileURL];
if ([entity isKindOfClass:[DesktopEntity class]])
[_tableContents addObject:entity];
}
[ltableView reloadData];
This is bad idea as I am doing this inside " performInsertWithDragInfo" before
I return from tableView:(NSTableView *)tableView
acceptDrop:(id<NSDraggingInfo>)info row:(NSInteger)row
dropOperation:(NSTableViewDropOperation)dropOperation which looks wrong to me.
However I did not observe any issues on 10.9 where I extensively tested this.
When I ran the same code on 10.7 I started noticing issues.
May 16 09:49:55 Mac-107-Test-Machine GUD[13022]: *** Assertion failure in
-[NSTableRowData _addRowViewForVisibleRow:withPriorView:],
/SourceCache/AppKit/AppKit-1138.51/TableView.subproj/NSTableRowData.m:2484
May 16 09:49:55 Mac-107-Test-Machine GUD[13022]: Row 1 should be in the valid
visible section
I don't know why this is not seen in 10.9.
Is there any delegate that would get called after acceptDrop? In the
documentation I saw tableView:draggingSession:endedAtPoint:operation: but I
don't think its relevant here. Am I missing something?
Regards,
Varun
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