Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import warning from "warning"; import { CheckContext } from "../check"; import { CheckChangeContext, CheckProps } from "../check/Check"; import { ControlledProps, useDefaultValue } from "../form/controlled"; export interface CheckTreeProps extends ControlledProps<string[]> { /** * 已勾选的叶子节点的 name 集合 */ value?: string[]; /** * 勾选的节点变更时回调 */ onChange?: (value: string[], context: CheckChangeContext) => void; /** * 提供树的节点关系,每个子节点对应其父节点 */ relations: CheckTreeRelation; /** * 组件树内容,内部的 <Checkbox /> 状态将被托管 */ children?: React.ReactNode; /** * 禁用的控件 name */ disabledNames?: string[]; /** * 是否支持按 Shift 快捷键时多选 * @default true */ shiftSelect?: boolean; // /** // * disabled 的组件是否从全选的范围内排除 // * @default true // */ // excludeDisabledFromParent?: boolean; } /** * CheckTree 关系定义 interface ```ts interface CheckTreeRelation { [child: string]: string; } ``` */ export interface CheckTreeRelation { [child: string]: string; } export function CheckTree(props: CheckTreeProps) { const { relations, children, value, onChange, shiftSelect = true, disabledNames = [], } = useDefaultValue(props); const [prevCheck, setPrevCheck] = useState<string>(null); const disabledSet = completeDisabledNames(relations, disabledNames); const model = useMemo( () => getTreeModel( relations, value, disabledSet, shiftSelect, prevCheck, setPrevCheck ), [disabledSet, prevCheck, relations, shiftSelect, value] ); return ( <CheckContext.Provider value={{ inject(checkProps) { Iif (checkProps.type !== "checkbox") { return checkProps; } // 没有 name 时不受控 Iif (typeof checkProps.name === "undefined") { return checkProps; } warning( typeof checkProps.value === "undefined", 'Component managed by <CheckTree> will ignore the "value" prop' ); // [TODO] Table seclectable // warning( // typeof checkProps.disabled === 'undefined', // 'Component managed by <CheckTree> will ignore the "disabled" prop' // ); model.visit(checkProps); const checkName = checkProps.name; return { ...model.getNodeState(checkName), disabled: disabledNames.includes(checkProps.name), // 支持 checkbox 上的 onChange 处理时阻止默认的处理行为 onChange: (checked, context) => { Iif (typeof checkProps.onChange === "function") { checkProps.onChange(checked, context); if (context.event.defaultPrevented) { return; } } const selection = model.handleChange( checkProps.name, checked, context.event ); Eif (typeof onChange === "function") { onChange(selection, context); } }, ...checkProps, }; }, }} > {children} </CheckContext.Provider> ); } function completeDisabledNames( relations: CheckTreeRelation, names: string[] ): Set<string> { const nameSet = new Set<string>(names); for (let i = 0; i < names.length; ++i) { Object.entries(relations).forEach(([child, parent]) => { if (names[i] === parent && !nameSet.has(child)) { nameSet.add(child); names.push(child); } }); } return nameSet; } function isEventWithShiftKey( event: React.SyntheticEvent ): event is React.SyntheticEvent & { shiftKey: boolean } { return "shiftKey" in event; } function getTreeModel( relations: CheckTreeRelation, selection: string[], disabledSet: Set<string>, shiftSelect: boolean, prevCheck: string, setPrevCheck: (name: string) => void ) { // find parent via child const parentMap = new Map<string, string>(); // find chilren via parent const childrenMap = new Map<string, Set<string>>(); // build the parent map and children map for perfomance for (const [child, parent] of Object.entries(relations)) { // set parent for child parentMap.set(child, parent); // set children for parent let childrenSet = childrenMap.get(parent); if (!childrenSet) { childrenSet = new Set<string>(); childrenMap.set(parent, childrenSet); } childrenSet.add(child); } // selected leaf const selectionSet = new Set<string>(selection); // find node state via checkName const nodeStateMap = new Map< string, { value: boolean; indeterminate: boolean } >(); // classify check by level let levelMap: string[][] = [[]]; const visited: CheckProps[] = []; function visit(check: CheckProps) { if (!visited.find(({ name }) => name === check.name)) { visited.push(check); } } function calcLevel() { const roots = visited .filter(check => !parentMap.has(check.name)) .map(c => c.name); if (roots.length) { let curLevel = 0; levelMap = [roots]; const nameSet = new Set<string>(roots); while (true) { levelMap[curLevel + 1] = []; /* eslint-disable no-loop-func */ levelMap[curLevel].forEach(checkName => { if (childrenMap.has(checkName)) { const children = childrenMap.get(checkName); visited.forEach(({ name }) => { if (children.has(name) && !nameSet.has(name)) { nameSet.add(name); levelMap[curLevel + 1].push(name); } }); } }); /* eslint-enable no-loop-func */ curLevel += 1; if (!levelMap[curLevel].length) { break; } } } } function getVisitedIndex(checkName: string) { let index; let level; levelMap.forEach((checks, _level) => { checks.forEach((name, _index) => { if (name === checkName) { level = _level; index = _index; } }); }); return [level, index]; } function getVisitedName(level: number, index: number) { return levelMap[level][index]; } function getNodeState(checkName: string) { if (nodeStateMap.has(checkName)) { return nodeStateMap.get(checkName); } const children = childrenMap.get(checkName); // 叶子节点直接看是否在选取里 if (!children) { const nodeState = { value: selectionSet.has(checkName), indeterminate: false, }; nodeStateMap.set(checkName, nodeState); return nodeState; } let hasTouchedChild = false; let isAllChildrenChecked = true; for (const child of children) { const childState = getNodeState(child); if (childState.value || childState.indeterminate) { hasTouchedChild = true; } if (!childState.value) { isAllChildrenChecked = false; } } const nodeState = { value: isAllChildrenChecked, indeterminate: !isAllChildrenChecked && hasTouchedChild, }; nodeStateMap.set(checkName, nodeState); return nodeState; } function setNodeState(checkName: string, checked: boolean) { // disabled Iif (disabledSet.has(checkName)) { return; } const children = childrenMap.get(checkName); // 叶子节点,直接设置 if (!children) { if (checked) { selectionSet.add(checkName); } else { selectionSet.delete(checkName); } } // 递归设置 else { for (const child of children) { setNodeState(child, checked); } } } function getSelection() { return Array.from(selectionSet); } function handleChange( checkName: string, checked: boolean, event: React.SyntheticEvent ) { // 多选 Eif (shiftSelect) { Iif (event && isEventWithShiftKey(event) && event.shiftKey) { calcLevel(); const [level, index] = getVisitedIndex(checkName); if (prevCheck !== null) { const [prevLevel, prevIndex] = getVisitedIndex(prevCheck); if (level === prevLevel) { // 清空文字选区 if ("getSelection" in window) { window.getSelection().removeAllRanges(); } const min = index < prevIndex ? index : prevIndex; const max = index > prevIndex ? index : prevIndex; for (let i = min; i <= max; ++i) { setNodeState(getVisitedName(level, i), true); } setPrevCheck(checkName); return getSelection(); } } } if (checked) { setPrevCheck(checkName); } else { setPrevCheck(null); } } setNodeState(checkName, checked); return getSelection(); } return { visit, getNodeState, setNodeState, getSelection, handleChange, }; } |