Preventing unwanted slidebacks

FROM : Buzz Andersen
DATE : Thu Jan 16 18:03:40 2003

Hi all,
I have been wrestling with HFS promised drags in Cocoa for some time
now, and am seriously on the verge of writing my own Cocoa wrapper for
the Carbon drag manager to compensate for the limitations of Apple's
implementation.  Until I can accomplish that, however, I would very
much like to fix a current annoyance in an application of mine:
sometimes, when doing a promised drag, the drag "slides back," even
though the actual drag was successful.

This happens even though I  specify "slideBack: NO" when I call
"dragPromisedFilesOfTypes:".  My current theory about why this is
happening is that I am dragging from a table view, and the view is
timing out waiting for "tableView:writeRows:toPasteboard:" to return
and simply concluding that the drag was unsuccessful.  My understanding
is that this method is normally supposed to simply put something on the
pasteboard and quickly return "YES" or "NO".  Since I have to use that
method to call "dragPromisedFilesOfTypes:," which doesn't return until
the entire drag cycle is completed, I theorize that the behavior I am
experiencing is related to a timeout.

Does anyone have any ideas about how I could work around this for the
moment?  It doesn't have to be pretty since it is only needed until I
can implement a better drag mechanism.  Perhaps there is something that
I could override in an NSTableView subclass to prevent the slideback
from drawing?

Any help would be *greatly* appreciated, since I am banging my head
against the wall trying to solve this problem!

--
Buzz Andersen
email: <email_removed>
web: http://www.scifihifi.com
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