[MacRuby-devel] How do I handle file drop events in HotCocoa?

[Jeff Cohen]

Hi Laurant,

Thanks a lot for your reply.  And perhaps I misspoke somewhat - I'm not
trying to implement full drag and drop within my application, but only
receive simple filename drop events that originate from outside the
application.  I think that it's just a matter of adding a few extra delegate
mappings, but I don't understand how to "extend" more mappings into the
hotcocoa wrapper classes.

Perhaps instead I will try to build from source and add the mappings there,
and use a local build to test with.  If a miracle occurs and I can figure it
out, I will submit a patch. :-)

Thanks again!
Jeff


On Mon, Mar 16, 2009 at 1:02 PM, Laurent Sansonetti
<lsansonetti at apple.com>wrote:

> Hi Jeff,
>
> (Sorry for the late reply.)
>
>
> On Mar 14, 2009, at 9:09 PM, Jeff Cohen wrote:
>
>  Hello,
>>
>> I'm just getting started with MacRuby and HotCocoa (was a longtime .NET
>> developer, and wasn't interested in learning Cocoa until MacRuby came
>> along).  I have a simple HotCocoa app with just a table view, and I'd like
>> the user to be able to drop a filename from the Finder onto the table view
>> (or anywhere in my app). I can call registerForDraggedTypes() on my table
>> view object successfully.  But I'm not sure how to have events delegated to
>> my Application class (or if that's even possible).
>>
>> Looking at the hotcocoa source for wrapping NSView (view.rb), I don't see
>> delegate mappings for the draggingEntered or performDragOperation events.  I
>> think I need to do something like the mapping code does and write code like
>> this:
>>
>> delegating "draggingEntered", :to => :dragging_entered
>>
>> but I don't know where I can or should do that, or if I'm even on the
>> right track.
>>
>> Any hint of where I should get started would be appreciated.
>>
>
> I don't think HotCocoa exposes drag and drop facilities yet. In general
> drag and drop in Cocoa is non trivial to do (esp. if you want to integrate
> it with complex views such as NSTableViews).
>
> The following article describes how to implement drag and drop in Cocoa:
>
>
> http://developer.apple.com/documentation/Cocoa/Conceptual/DragandDrop/DragandDrop.html
>
> It even has a special section dedicated to NSTableViews.
>
> You should be able to do everything  described in this article using "pure"
> MacRuby code but if you want to use some kind of syntax sugar via HotCocoa
> I'm afraid you will have to wait until someone implements them.
>
> HTH,
> Laurent
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