Dynamic DropZone allow/disallow

[chrisvxd]

Currently, the allow / disallow API on DropZone is static. This makes more sophisticated conditions difficult, such as restricting the insert of an item based on the number of that component type already in the DropZone.

Proposal

New canInsert API

A new API to dynamically resolve the allow/disallow list. Probably needs a better name.

<DropZone canInsert={(componentType, content) => {
  return !content.find(item => item.type === componentType)
}} />

Notes

• Related to More portable data payload #255, which may change the DropZone API