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Provide support to drag and drop the cards between Kanban and from an external source such as list, tree view. Also, allow dragging the cards from Kanban to external sources.
Get the drop target from the user and make a process based on it.
When dropping cards from external sources, get the details, and create a card using public methods.
If drop the cards on the header, disable cursor must be displayed and doesn't allow you to drop the cards.
For more details.
Already the support is available in EJ1-Kanban.