296 lines
8.9 KiB
Vue
296 lines
8.9 KiB
Vue
import PropTypes from '../_util/vue-types';
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import ResizeObserver from 'resize-observer-polyfill';
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import SubMenu from './SubMenu';
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import BaseMixin from '../_util/BaseMixin';
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import { getWidth, setStyle, menuAllProps } from './util';
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import { cloneElement } from '../_util/vnode';
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import { getPropsData, getAllProps, getSlot, findDOMNode } from '../_util/props-util';
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const MENUITEM_OVERFLOWED_CLASSNAME = 'menuitem-overflowed';
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const FLOAT_PRECISION_ADJUST = 0.5;
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const DOMWrap = {
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name: 'DOMWrap',
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mixins: [BaseMixin],
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data() {
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this.resizeObserver = null;
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this.mutationObserver = null;
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// original scroll size of the list
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this.originalTotalWidth = 0;
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// copy of overflowed items
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this.overflowedItems = [];
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// cache item of the original items (so we can track the size and order)
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this.menuItemSizes = [];
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return {
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lastVisibleIndex: undefined,
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};
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},
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mounted() {
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this.$nextTick(() => {
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this.setChildrenWidthAndResize();
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if (this.level === 1 && this.mode === 'horizontal') {
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const menuUl = findDOMNode(this);
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if (!menuUl) {
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return;
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}
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this.resizeObserver = new ResizeObserver(entries => {
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entries.forEach(this.setChildrenWidthAndResize);
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});
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[].slice
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.call(menuUl.children)
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.concat(menuUl)
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.forEach(el => {
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this.resizeObserver.observe(el);
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});
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if (typeof MutationObserver !== 'undefined') {
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this.mutationObserver = new MutationObserver(() => {
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this.resizeObserver.disconnect();
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[].slice
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.call(menuUl.children)
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.concat(menuUl)
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.forEach(el => {
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this.resizeObserver.observe(el);
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});
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this.setChildrenWidthAndResize();
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});
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this.mutationObserver.observe(menuUl, {
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attributes: false,
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childList: true,
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subTree: false,
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});
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}
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}
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});
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},
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beforeUnmount() {
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if (this.resizeObserver) {
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this.resizeObserver.disconnect();
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}
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if (this.mutationObserver) {
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this.mutationObserver.disconnect();
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}
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},
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methods: {
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// get all valid menuItem nodes
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getMenuItemNodes() {
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const { prefixCls } = this.$props;
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const ul = findDOMNode(this);
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if (!ul) {
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return [];
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}
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// filter out all overflowed indicator placeholder
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return [].slice
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.call(ul.children)
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.filter(node => node.className.split(' ').indexOf(`${prefixCls}-overflowed-submenu`) < 0);
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},
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getOverflowedSubMenuItem(keyPrefix, overflowedItems, renderPlaceholder) {
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const { overflowedIndicator, level, mode, prefixCls, theme } = this.$props;
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if (level !== 1 || mode !== 'horizontal') {
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return null;
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}
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// put all the overflowed item inside a submenu
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// with a title of overflow indicator ('...')
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const copy = getSlot(this)[0];
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const { title, ...rest } = getAllProps(copy); // eslint-disable-line no-unused-vars
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let style = {};
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let key = `${keyPrefix}-overflowed-indicator`;
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let eventKey = `${keyPrefix}-overflowed-indicator`;
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if (overflowedItems.length === 0 && renderPlaceholder !== true) {
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style = {
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display: 'none',
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};
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} else if (renderPlaceholder) {
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style = {
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visibility: 'hidden',
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// prevent from taking normal dom space
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position: 'absolute',
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};
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key = `${key}-placeholder`;
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eventKey = `${eventKey}-placeholder`;
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}
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const popupClassName = theme ? `${prefixCls}-${theme}` : '';
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const props = {};
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menuAllProps.forEach(k => {
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if (rest[k] !== undefined) {
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props[k] = rest[k];
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}
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});
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const subMenuProps = {
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title: overflowedIndicator,
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popupClassName,
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...props,
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eventKey,
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disabled: false,
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class: `${prefixCls}-overflowed-submenu`,
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key,
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style,
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};
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return <SubMenu {...subMenuProps}>{overflowedItems}</SubMenu>;
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},
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// memorize rendered menuSize
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setChildrenWidthAndResize() {
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if (this.mode !== 'horizontal') {
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return;
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}
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const ul = findDOMNode(this);
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if (!ul) {
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return;
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}
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const ulChildrenNodes = ul.children;
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if (!ulChildrenNodes || ulChildrenNodes.length === 0) {
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return;
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}
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const lastOverflowedIndicatorPlaceholder = ul.children[ulChildrenNodes.length - 1];
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// need last overflowed indicator for calculating length;
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setStyle(lastOverflowedIndicatorPlaceholder, 'display', 'inline-block');
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const menuItemNodes = this.getMenuItemNodes();
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// reset display attribute for all hidden elements caused by overflow to calculate updated width
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// and then reset to original state after width calculation
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const overflowedItems = menuItemNodes.filter(
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c => c.className.split(' ').indexOf(MENUITEM_OVERFLOWED_CLASSNAME) >= 0,
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);
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overflowedItems.forEach(c => {
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setStyle(c, 'display', 'inline-block');
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});
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this.menuItemSizes = menuItemNodes.map(c => getWidth(c));
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overflowedItems.forEach(c => {
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setStyle(c, 'display', 'none');
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});
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this.overflowedIndicatorWidth = getWidth(ul.children[ul.children.length - 1]);
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this.originalTotalWidth = this.menuItemSizes.reduce((acc, cur) => acc + cur, 0);
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this.handleResize();
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// prevent the overflowed indicator from taking space;
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setStyle(lastOverflowedIndicatorPlaceholder, 'display', 'none');
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},
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handleResize() {
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if (this.mode !== 'horizontal') {
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return;
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}
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const ul = findDOMNode(this);
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if (!ul) {
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return;
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}
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const width = getWidth(ul);
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this.overflowedItems = [];
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let currentSumWidth = 0;
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// index for last visible child in horizontal mode
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let lastVisibleIndex;
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// float number comparison could be problematic
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// e.g. 0.1 + 0.2 > 0.3 =====> true
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// thus using FLOAT_PRECISION_ADJUST as buffer to help the situation
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if (this.originalTotalWidth > width + FLOAT_PRECISION_ADJUST) {
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lastVisibleIndex = -1;
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this.menuItemSizes.forEach(liWidth => {
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currentSumWidth += liWidth;
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if (currentSumWidth + this.overflowedIndicatorWidth <= width) {
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lastVisibleIndex += 1;
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}
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});
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}
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this.setState({ lastVisibleIndex });
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},
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renderChildren(children) {
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// need to take care of overflowed items in horizontal mode
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const { lastVisibleIndex } = this.$data;
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const className = this.$attrs.class || '';
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return (children || []).reduce((acc, childNode, index) => {
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let item = childNode;
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const eventKey = getPropsData(childNode).eventKey;
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if (this.mode === 'horizontal') {
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let overflowed = this.getOverflowedSubMenuItem(eventKey, []);
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if (
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lastVisibleIndex !== undefined &&
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className.indexOf(`${this.prefixCls}-root`) !== -1
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) {
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if (index > lastVisibleIndex) {
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item = cloneElement(
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childNode,
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// 这里修改 eventKey 是为了防止隐藏状态下还会触发 openkeys 事件
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{
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style: { display: 'none' },
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eventKey: `${eventKey}-hidden`,
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class: MENUITEM_OVERFLOWED_CLASSNAME,
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},
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);
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}
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if (index === lastVisibleIndex + 1) {
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this.overflowedItems = children.slice(lastVisibleIndex + 1).map(c => {
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return cloneElement(
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c,
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// children[index].key will become '.$key' in clone by default,
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// we have to overwrite with the correct key explicitly
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{
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key: getPropsData(c).eventKey,
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mode: 'vertical-left',
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},
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);
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});
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overflowed = this.getOverflowedSubMenuItem(eventKey, this.overflowedItems);
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}
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}
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const ret = [...acc, overflowed, item];
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if (index === children.length - 1) {
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// need a placeholder for calculating overflowed indicator width
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ret.push(this.getOverflowedSubMenuItem(eventKey, [], true));
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}
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return ret;
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}
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return [...acc, item];
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}, []);
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},
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},
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render() {
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const Tag = this.$props.tag;
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return <Tag>{this.renderChildren(getSlot(this))}</Tag>;
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},
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};
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DOMWrap.props = {
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mode: PropTypes.oneOf(['horizontal', 'vertical', 'vertical-left', 'vertical-right', 'inline']),
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prefixCls: PropTypes.string,
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level: PropTypes.number,
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theme: PropTypes.string,
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overflowedIndicator: PropTypes.any,
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visible: PropTypes.looseBool,
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hiddenClassName: PropTypes.string,
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tag: PropTypes.string.def('div'),
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};
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export default DOMWrap;
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