[Cuis-dev] drag & drop

[Luciano Notarfrancesco]

Our implementation of drag & drop in morphic doesn’t seem to provide a
mechanism for showing visual feedback on wether the morph that you’re
hovering will accept or not the dragged morph. Or is it? I can’t find it.
I’d like to highlight the target morph when the hand hovers over it with a
morph that it can accept, and I tried implementing it mouse
enter/leave/hover events but they are not delivered unless the hand is
empty (i.e., not during drag). Any idea? Am I missing something?

Also, it would be nice to have a way to calcel drag (with ESC, maybe?).
Right now I just cancel by dropping it in its original place but it feels
awkward.
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