+ return node
+ ? cascade
+ ? pipe(
+ setNode({ ...node, selected: !node.selected }),
+ toggleAncestorsSelection(id),
+ toggleDescendantsSelection(id))(tree)
+ : setNode({ ...node, selected: !node.selected })(tree)
+ : tree;
+};
+
+export const selectNode = (id: string, cascade: boolean) => <T>(tree: Tree<T>) => {
+ const node = getNode(id)(tree);
+ return node && node.selected
+ ? tree
+ : toggleNodeSelection(id, cascade)(tree);
+};
+
+export const selectNodes = (id: string | string[], cascade: boolean) => <T>(tree: Tree<T>) => {
+ const ids = typeof id === 'string' ? [id] : id;
+ return ids.reduce((tree, id) => selectNode(id, cascade)(tree), tree);
+};
+export const deselectNode = (id: string, cascade: boolean) => <T>(tree: Tree<T>) => {
+ const node = getNode(id)(tree);
+ return node && node.selected
+ ? toggleNodeSelection(id, cascade)(tree)
+ : tree;
+};
+
+export const deselectNodes = (id: string | string[], cascade: boolean) => <T>(tree: Tree<T>) => {
+ const ids = typeof id === 'string' ? [id] : id;
+ return ids.reduce((tree, id) => deselectNode(id, cascade)(tree), tree);
+};
+
+export const getSelectedNodes = <T>(tree: Tree<T>) =>
+ getNodeDescendants('')(tree)
+ .filter(node => node.selected);
+
+export const initTreeNode = <T>(data: Pick<TreeNode<T>, 'id' | 'value'> & { parent?: string }): TreeNode<T> => ({
+ children: [],
+ active: false,
+ selected: false,
+ expanded: false,
+ status: TreeNodeStatus.INITIAL,
+ parent: '',
+ ...data,
+});
+
+export const getTreeDirty = (id: string) => <T>(tree: Tree<T>): boolean => {
+ const node = getNode(id)(tree);
+ const children = getNodeDescendants(id)(tree);
+ return (node
+ && node.initialState !== undefined
+ && node.selected !== node.initialState
+ )
+ || children.some(child =>
+ child.initialState !== undefined
+ && child.selected !== child.initialState
+ );
+}
+
+const toggleDescendantsSelection = (id: string) => <T>(tree: Tree<T>) => {
+ const node = getNode(id)(tree);