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Allow User-Defined Collapsed State for Nodes, Defaults to False if Not Specified #514

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Allow User-Defined Collapsed State for Nodes, Defaults to False if Not Specified #514

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14 changes: 8 additions & 6 deletions src/Tree/index.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -210,12 +210,14 @@ class Tree extends React.Component<TreeProps, TreeState> {
const d = Array.isArray(data) ? data : [data];
return d.map(n => {
const nodeDatum = n as TreeNodeDatum;
nodeDatum.__rd3t = { id: null, depth: null, collapsed: false };
nodeDatum.__rd3t.id = uuidv4();
// D3@v5 compat: manually assign `depth` to node.data so we don't have
// to hold full node+link sets in state.
// TODO: avoid this extra step by checking D3's node.depth directly.
nodeDatum.__rd3t.depth = currentDepth;
nodeDatum.__rd3t = {
id: uuidv4(),
depth: currentDepth || null,
collapsed: nodeDatum.__rd3t && typeof nodeDatum.__rd3t.collapsed === 'boolean'
? nodeDatum.__rd3t.collapsed
: false,
};

// If there are children, recursively assign properties to them too.
if (nodeDatum.children && nodeDatum.children.length > 0) {
nodeDatum.children = Tree.assignInternalProperties(nodeDatum.children, currentDepth + 1);
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