To implement dragging in
list-panel
or
tree-view
supply the
:drag-callback
initarg. When the user drags,
drag-callback
receives a list of indices of the choice items being dragged. The
drag-callback
should return a property list whose keys are the data formats (such as
:string
or
:image
) to be dragged, along with the values associated with each format.
CAPI User Guide (Unix version) - 30 Aug 2011