objective c - How to be notified in OS X when a drag operation *starts* anywhere? -

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i'm wondering if there's way have application notified when drag-and-drop operation starts anywhere on screen, if don't have active window there.

i've looked normal drag-and-drop apis, haven't spotted this. nsdraggingdestination protocol along -[nswindow/nsview registerfordraggedtypes:] method allows notice when dragging , crosses on window, i'd notice when dragging operation started anywhere on screen.

any tips on how go this? there standard cocoa api it, or there private api / kind of dirty hack information?

thanks in advance :)

take @ nsevent’s +addglobalmonitorforeventsmatchingmask:handler:. i’m not sure if can track mouse dragging it’s possible track mouse button up/down events.


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