NSAlert runModal in outlineView:acceptDrop crashes with may not be invoked inside of transaction begin/commit pair
Hello,
I have an OutlineView. Whenever I drag and drop a child item within the
Outline-View my application crashes when I open do an "NSAlert runModal"
like in the code below:
- (BOOL)outlineView:(NSOutlineView *)outlineView acceptDrop:(id <
NSDraggingInfo >)info item:(id)item childIndex:(NSInteger)index
{
...
1 if(needToAskUser)
{
2 NSAlert *alert = [[NSAlert alloc] init];
3 // .. set some texts and buttons in alert
4 [alert runModal];
}
}
In line 4 the app crashes with the following uncaught exception:
[General] -[NSAlert runModal] may not be invoked inside of transaction
begin/commit pair, or inside of transaction commit (usually this means
it was invoked inside of a view's -drawRect: method.)
I have a tree like this:
Top Level 1
- Child Item A
- Child Item B
Top Level 2
- Child Item C
...
The problem occurs only, when I drag one of the Child Items within the
same view. It does not matter whether I move Child Item A below Child
Item B or if I move it to another Top Level item, for example below
Child Item C.
Moving the block into a call to
dispatch_async(dispatch_get_main_queue(), ^{ }); did also not help.
Has anyone any idea what the problem is?
Best regards,
Michael Kloske
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Re: Drag and Drop of NSTokenField stopped working in Catalina
On 06/30/20 18:46, James Walker via Cocoa-dev wrote:
My code (working in Catalina) is
- (BOOL)tokenField:(NSTokenField *)tokenField
writeRepresentedObjects:(NSArray *)objects
toPasteboard:(NSPasteboard *)pboard
{
[pboard clearContents];
return [pboard writeObjects:objects];
}
This works for me. Thanks a lot.
Best regards, Michael Kloske
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Re: Drag and Drop of NSTokenField stopped working in Catalina
>> in my application I have several NSTokenField - objects that are used to >> drag them into a text field to build up a string by some tokens. >> However, since Catalina dragging of those NSTokenField - objects does not >> work anymore. >> In Xcode I get the following message: >> >> ": There was an exception (There are >> 2 items on the pasteboard, but 1 drag images. There must be 1 draggingItem >> per pasteboardItem.) raised while processing drag. Ignoring…” > > > The NSTokenField is used in the Mail application in the address field. Using > the Mail app in Catalina, drag a token from the address field to a TextEdit > document. Does that work? > > I would try it but my primary development machine is macOS Sierra. > This works pretty well. If writableTypesForPasteboard returns just nil, it would also work in my application but then I would miss my internal data. —Michael Kloske ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Drag and Drop of NSTokenField stopped working in Catalina
Hello,
in my application I have several NSTokenField - objects that are used to drag
them into a text field to build up a string by some tokens.
However, since Catalina dragging of those NSTokenField - objects does not work
anymore.
In Xcode I get the following message:
": There was an exception (There are 2
items on the pasteboard, but 1 drag images. There must be 1 draggingItem per
pasteboardItem.) raised while processing drag. Ignoring…”
For handling the paste board writing I have the following code in my token
objects which implement :
- (NSArray *)writableTypesForPasteboard:(NSPasteboard *)pasteboard
{
return @[ @“" ];
}
In my window controller, which implements I have the
following code:
- (BOOL)tokenField:(NSTokenField *)tokenField
writeRepresentedObjects:(NSArray *)objects
toPasteboard:(NSPasteboard *)pboard
{
return [pboard writeObjects:objects];
}
As I said it worked pretty well until (including) Mojave but stopped working in
Catalina with the above error message.
As I saw in addition to my “my.unique.UTI.id
