Re: DnD International No symbol
Re: DnD International No symbol
- Subject: Re: DnD International No symbol
- From: John Joyce <email@hidden>
- Date: Thu, 17 Jun 2010 00:00:57 -0500
The common behavior is that it will not drop and will (very quickly) snap back to origin.
On Jun 16, 2010, at 9:19 PM, Tony Romano wrote:
> Hmm... I'm returning the NSDragOperationNone now, all I get is an image of what is being dragged no other symbol and the outlineview won't accept the drop which is correct. When I have a valid selection, I get the other symbol for copy(green circle with plus sign), or for Move, the outlineview highlights the drop point.
>
> -Tony
>
> On Jun 16, 2010, at 7:11 PM, Kyle Sluder wrote:
>
>> On Wed, Jun 16, 2010 at 6:55 PM, Tony Romano <email@hidden> wrote:
>>> Briefly, in a DnD operation all the nodes selected need to be siblings of each other. During validateDrop I check for this and it calculates it just fine. However, I need to set the DnD image to something indicating this is not allowed, I thought using the International NO symbol made sense but it is not defined as one of the NSDragOperation... flags. So I am thinking either this is not HIG compliant or it is and I just need to supply my own. I know I have seen other apps do it but it's doesn't been it's HIG compliant.
>>
>> I believe that's a Carbon thing; there is also no standard "not
>> allowed" cursor. Just return NSDragOperationNone and let the
>> slide-back animation do its job.
>>
>> If you want to explain to the user why they can't drag, maybe you
>> could use a tooltip? Query the draggingInfo in -draggingUpdated: and
>> use it to position a borderless window that describes why the
>> operation can't be done.
>>
>> --Kyle Sluder
>>
>
> -Tony
>
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