preventing some children from being parents about react-sortable-tree HOT 3 CLOSED

1. Prevent children from being parents
@mikevandre react-dnd uses types wich let you specify which drag sources and drop targets are compatible. Check DropTarget. Looked quickly through the code and seems like every dragsource is passed with default ItemTypes.HANDLE: https://github.com/fritz-c/react-sortable-tree/blob/3e8e10e276beeaf47aa99965e9a41a1cb05712a7/src/utils/drag-and-drop-utils.js#L214

Other than that @fritz-c has done an excellent job! I've been working on similar project and tree-data-utils.js gave me some good ideas how to better flatten the tree.

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1. Prevent children from being parents

Of your three questions, this is probably the most difficult to implement. I recently looked into adding a canDrop method that the user can customize to prevent dropping under certain circumstances. However, the amount of calculation that goes into seeing where the node will land in the tree, repeated every time there's a new drag event over the drop area, makes it really difficult to provide a flexible and performant canDrop API. I plan on revisiting that problem eventually, and am welcome to any suggestions for how to make it work quickly.

2. Metadata beyond title, subtitle

Just add anything you want in the data for the nodes, and it will be available in every callback.

3. Different types of nodes that render differently

If it's just style differences, you can use the generateNodeProps prop to add certain className props based on the node info.
If you want to more than that, you can set the nodeContentRenderer prop to a component you create yourself. With this, almost any aspect of the appearance of the nodes can be changed. If you decide to take this path, I highly recommend copying the node-renderer-default.js and node-renderer-default.scss files to your own code base and modifying them as you need.

Even if this library doesn't seem like a good choice for your project, you might consider using the functions in tree-data-utils.js to manipulate tree data.

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I just released the canDrop API with version 0.1.13. I think this should help you do what you're trying to do.

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