190 lines
6.9 KiB
JavaScript
190 lines
6.9 KiB
JavaScript
import { __decorate } from "tslib";
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import { html } from 'lit';
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import { customElement, property, queryAssignedElements, state, } from 'lit/decorators.js';
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import { DefinedController } from '@mdui/shared/controllers/defined.js';
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import { watch } from '@mdui/shared/decorators/watch.js';
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import { booleanConverter } from '@mdui/shared/helpers/decorator.js';
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import { componentStyle } from '@mdui/shared/lit-styles/component-style.js';
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import { ScrollBehaviorMixin } from '@mdui/shared/mixins/scrollBehavior.js';
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import { LayoutItemBase } from '../layout/layout-item-base.js';
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import { navigationBarStyle } from './navigation-bar-style.js';
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/**
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* @summary 底部导航栏组件。需配合 `<mdui-navigation-bar-item>` 组件使用
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*
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* ```html
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* <mdui-navigation-bar>
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* ..<mdui-navigation-bar-item icon="place">Item 1</mdui-navigation-bar-item>
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* ..<mdui-navigation-bar-item icon="commute">Item 2</mdui-navigation-bar-item>
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* ..<mdui-navigation-bar-item icon="people">Item 3</mdui-navigation-bar-item>
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* </mdui-navigation-bar>
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* ```
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*
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* @event change - 值变化时触发
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* @event show - 开始显示时，事件被触发。可以通过调用 `event.preventDefault()` 阻止显示
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* @event shown - 显示动画完成时，事件被触发
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* @event hide - 开始隐藏时，事件被触发。可以通过调用 `event.preventDefault()` 阻止隐藏
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* @event hidden - 隐藏动画完成时，事件被触发
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*
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* @slot - `<mdui-navigation-bar-item>` 组件
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*
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* @cssprop --shape-corner - 组件的圆角大小。可以指定一个具体的像素值；但更推荐引用[设计令牌](/docs/2/styles/design-tokens#shape-corner)
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* @cssprop --z-index - 组件的 CSS `z-index` 值
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*/
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let NavigationBar = class NavigationBar extends ScrollBehaviorMixin(LayoutItemBase) {
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constructor() {
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super(...arguments);
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/**
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* 是否隐藏
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*/
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this.hide = false;
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/**
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* 文本的可视状态。可选值包括：
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*
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* * `auto`：当选项小于等于3个时，始终显示文本；当选项大于3个时，仅显示选中状态的文本
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* * `selected`：仅在选中状态显示文本
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* * `labeled`：始终显示文本
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* * `unlabeled`：始终不显示文本
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*/
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this.labelVisibility = 'auto';
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// 因为 navigation-bar-item 的 value 可能会重复，所以在每个 navigation-bar-item 元素上都添加了一个唯一的 key，通过 activeKey 来记录激活状态的 key
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this.activeKey = 0;
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// 是否是初始状态，初始状态不触发 change 事件，没有动画
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this.isInitial = true;
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this.definedController = new DefinedController(this, {
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relatedElements: ['mdui-navigation-bar-item'],
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});
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}
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get scrollPaddingPosition() {
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return 'bottom';
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}
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get layoutPlacement() {
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return 'bottom';
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}
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async onActiveKeyChange() {
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await this.definedController.whenDefined();
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// 根据 activeKey 读取对应 navigation-bar-item 的值
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const item = this.items.find((item) => item.key === this.activeKey);
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this.value = item?.value;
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if (!this.isInitial) {
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this.emit('change');
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}
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}
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async onValueChange() {
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this.isInitial = !this.hasUpdated;
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await this.definedController.whenDefined();
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const item = this.items.find((item) => item.value === this.value);
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this.activeKey = item?.key ?? 0;
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this.updateItems();
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}
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async onLabelVisibilityChange() {
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await this.definedController.whenDefined();
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this.updateItems();
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}
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firstUpdated(_changedProperties) {
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super.firstUpdated(_changedProperties);
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this.addEventListener('transitionend', (event) => {
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if (event.target === this) {
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this.emit(this.hide ? 'hidden' : 'shown');
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}
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});
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}
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render() {
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return html `<slot @slotchange="${this.onSlotChange}" @click="${this.onClick}"></slot>`;
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}
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/**
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* 滚动行为
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* 当前仅支持 hide 这一个行为，所以不做行为类型判断
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*/
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runScrollThreshold(isScrollingUp) {
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// 向下滚动
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if (!isScrollingUp && !this.hide) {
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const eventProceeded = this.emit('hide', { cancelable: true });
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if (eventProceeded) {
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this.hide = true;
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}
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}
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// 向上滚动
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if (isScrollingUp && this.hide) {
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const eventProceeded = this.emit('show', { cancelable: true });
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if (eventProceeded) {
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this.hide = false;
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}
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}
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}
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onClick(event) {
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// event.button 为 0 时，为鼠标左键点击。忽略鼠标中键和右键
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if (event.button) {
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return;
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}
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const target = event.target;
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const item = target.closest('mdui-navigation-bar-item');
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if (!item) {
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return;
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}
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this.activeKey = item.key;
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this.isInitial = false;
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this.updateItems();
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}
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// 更新 <mdui-navigation-bar-item> 的状态
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updateItems() {
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const items = this.items;
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// <mdui-navigation-bar-item> 的 labelVisibility 不含 auto
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const labelVisibility = this.labelVisibility === 'auto'
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? items.length <= 3
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? 'labeled'
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: 'selected'
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: this.labelVisibility;
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items.forEach((item) => {
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item.active = this.activeKey === item.key;
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item.labelVisibility = labelVisibility;
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item.isInitial = this.isInitial;
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});
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}
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async onSlotChange() {
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await this.definedController.whenDefined();
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this.updateItems();
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}
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};
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NavigationBar.styles = [
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componentStyle,
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navigationBarStyle,
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];
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__decorate([
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property({
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type: Boolean,
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reflect: true,
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converter: booleanConverter,
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})
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], NavigationBar.prototype, "hide", void 0);
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__decorate([
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property({ reflect: true, attribute: 'label-visibility' })
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], NavigationBar.prototype, "labelVisibility", void 0);
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__decorate([
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property({ reflect: true })
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], NavigationBar.prototype, "value", void 0);
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__decorate([
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property({ reflect: true, attribute: 'scroll-behavior' })
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], NavigationBar.prototype, "scrollBehavior", void 0);
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__decorate([
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state()
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], NavigationBar.prototype, "activeKey", void 0);
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__decorate([
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queryAssignedElements({
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selector: 'mdui-navigation-bar-item',
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flatten: true,
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})
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], NavigationBar.prototype, "items", void 0);
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__decorate([
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watch('activeKey', true)
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], NavigationBar.prototype, "onActiveKeyChange", null);
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__decorate([
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watch('value')
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], NavigationBar.prototype, "onValueChange", null);
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__decorate([
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watch('labelVisibility', true)
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], NavigationBar.prototype, "onLabelVisibilityChange", null);
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NavigationBar = __decorate([
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customElement('mdui-navigation-bar')
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], NavigationBar);
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export { NavigationBar };
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