I've got a simple, single-column, view-based NSTableView with items in it that can be dragged to reorder them. During drag and drop, I'd like to make it so that a gap for the item-to-be-dropped opens up at the location under the mouse. GarageBand does something like this when you drag to reorder tracks (video here: http://www.screencast.com/t/OmUVHcCNSl). As far as I can tell, there's no built in support for this in NSTableView.
Has anyone else tried to add this behavior to NSTableView and found a good solution? I've thought of and tried a couple approaches without much success. My first thought was to double the height of the row under the mouse during a drag by sending -noteHeightOfRowsWithIndexesChanged: in my data source's -tableView:validateDrop:... method, then returning twice the normal height in -tableView:heightOfRow:. Unfortunately, best I can tell, NSTableView doesn't update its layout during drag and drop, so despite calling noteHeightOfRowsWithIndexesChanged:, the row height isn't actually updated. Note that I'm using a view-based NSTableView, but my rows are not so complex that I couldn't move to a cell-based table view if doing so helped accomplish this. Thanks, Andrew _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
