import React, { createContext, useCallback, useContext, useReducer, useEffect, useMemo, useState, } from 'react' import PropTypes from 'prop-types' import classNames from 'classnames' import { findInTree } from '../util/find-in-tree' import { useFileTreeMutable } from './file-tree-mutable' import { useFileTreeMainContext } from './file-tree-main' import usePersistedState from '../../../infrastructure/persisted-state-hook' const FileTreeSelectableContext = createContext() const ACTION_TYPES = { SELECT: 'SELECT', MULTI_SELECT: 'MULTI_SELECT', UNSELECT: 'UNSELECT', } function fileTreeSelectableReadWriteReducer(selectedEntityIds, action) { switch (action.type) { case ACTION_TYPES.SELECT: { // reset selection return new Set([action.id]) } case ACTION_TYPES.MULTI_SELECT: { const selectedEntityIdsCopy = new Set(selectedEntityIds) if (selectedEntityIdsCopy.has(action.id)) { // entity already selected if (selectedEntityIdsCopy.size > 1) { // entity already multi-selected; remove from set selectedEntityIdsCopy.delete(action.id) } } else { // entity not selected: add to set selectedEntityIdsCopy.add(action.id) } return selectedEntityIdsCopy } case ACTION_TYPES.UNSELECT: { const selectedEntityIdsCopy = new Set(selectedEntityIds) selectedEntityIdsCopy.delete(action.id) return selectedEntityIdsCopy } default: throw new Error(`Unknown selectable action type: ${action.type}`) } } function fileTreeSelectableReadOnlyReducer(selectedEntityIds, action) { switch (action.type) { case ACTION_TYPES.SELECT: return new Set([action.id]) case ACTION_TYPES.MULTI_SELECT: case ACTION_TYPES.UNSELECT: return selectedEntityIds default: throw new Error(`Unknown selectable action type: ${action.type}`) } } export function FileTreeSelectableProvider({ hasWritePermissions, rootDocId, onSelect, children, }) { const { projectId } = useFileTreeMainContext() const [initialSelectedEntityId] = usePersistedState( `doc.open_id.${projectId}`, rootDocId ) const { fileTreeData } = useFileTreeMutable() const [selectedEntityIds, dispatch] = useReducer( hasWritePermissions ? fileTreeSelectableReadWriteReducer : fileTreeSelectableReadOnlyReducer, null, () => { if (!initialSelectedEntityId) return new Set() // the entity with id=initialSelectedEntityId might not exist in the tree // anymore. This checks that it exists before initialising the reducer // with the id. if (findInTree(fileTreeData, initialSelectedEntityId)) return new Set([initialSelectedEntityId]) // the entity doesn't exist anymore; don't select any files return new Set() } ) const [selectedEntityParentIds, setSelectedEntityParentIds] = useState( new Set() ) // fills `selectedEntityParentIds` set useEffect(() => { const ids = new Set() selectedEntityIds.forEach(id => { const found = findInTree(fileTreeData, id) if (found) { found.path.forEach(pathItem => ids.add(pathItem)) } }) setSelectedEntityParentIds(ids) }, [fileTreeData, selectedEntityIds]) // calls `onSelect` on entities selection useEffect(() => { const selectedEntities = Array.from(selectedEntityIds).map(id => findInTree(fileTreeData, id) ) onSelect(selectedEntities) }, [fileTreeData, selectedEntityIds, onSelect]) useEffect(() => { // listen for `editor.openDoc` and selected that doc function handleOpenDoc(ev) { const found = findInTree(fileTreeData, ev.detail) if (!found) return dispatch({ type: ACTION_TYPES.SELECT, id: found.entity._id }) } window.addEventListener('editor.openDoc', handleOpenDoc) return () => window.removeEventListener('editor.openDoc', handleOpenDoc) }, [fileTreeData]) const select = useCallback(id => { dispatch({ type: ACTION_TYPES.SELECT, id }) }, []) const unselect = useCallback(id => { dispatch({ type: ACTION_TYPES.UNSELECT, id }) }, []) const selectOrMultiSelectEntity = useCallback((id, isMultiSelect) => { const actionType = isMultiSelect ? ACTION_TYPES.MULTI_SELECT : ACTION_TYPES.SELECT dispatch({ type: actionType, id }) }, []) const value = { selectedEntityIds, selectedEntityParentIds, select, unselect, selectOrMultiSelectEntity, } return ( {children} ) } FileTreeSelectableProvider.propTypes = { hasWritePermissions: PropTypes.bool.isRequired, rootDocId: PropTypes.string, onSelect: PropTypes.func.isRequired, children: PropTypes.oneOfType([ PropTypes.arrayOf(PropTypes.node), PropTypes.node, ]).isRequired, } export function useSelectableEntity(id) { const { selectedEntityIds, selectOrMultiSelectEntity } = useContext( FileTreeSelectableContext ) const isSelected = selectedEntityIds.has(id) const handleEvent = useCallback( ev => { selectOrMultiSelectEntity(id, ev.ctrlKey || ev.metaKey) }, [id, selectOrMultiSelectEntity] ) const handleClick = useCallback( ev => { handleEvent(ev) }, [handleEvent] ) const handleKeyPress = useCallback( ev => { if (ev.key === 'Enter' || ev.key === ' ') { handleEvent(ev) } }, [handleEvent] ) const handleContextMenu = useCallback( ev => { // make sure the right-clicked entity gets selected if (!selectedEntityIds.has(id)) { handleEvent(ev) } }, [id, handleEvent, selectedEntityIds] ) const props = useMemo( () => ({ className: classNames({ selected: isSelected }), 'aria-selected': isSelected, onClick: handleClick, onContextMenu: handleContextMenu, onKeyPress: handleKeyPress, }), [handleClick, handleContextMenu, handleKeyPress, isSelected] ) return { isSelected, props } } export function useFileTreeSelectable() { const context = useContext(FileTreeSelectableContext) if (!context) { throw new Error( `useFileTreeSelectable is only available inside FileTreeSelectableProvider` ) } return context }