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EventBus

#harmony #haromonyos #arkts

EventBus

🏆Introduction and Recommendations

EventBus Message bus, supports Sticky, supports cross-APP broadcasting.

harmony-utils A HarmonyOS tool library with rich features and extremely easy to use, with the help of many practical tools, is committed to helping developers quickly build Hongmeng applications.

🌞Download and install

ohpm i @nutpi/eventbus
OpenHarmony ohpm
For more information, please refer to如何安装 OpenHarmony ohpm 包

📚API detailed explanation

EventBus method Introduction
on Register Event Listening
once Register a single event listening
off Logout event listening
offAll Log out all event listening
post Post regular news
postSticky Post sticky news
postApp Publish cross-app messages
getSticky Get sticky event data
removeSticky Remove sticky events

📚Sample code 

//注册事件监听 EventBus.on('id', (id: string) => { ToastUtil.showToast(`ID: ${id}`); }); //注册单次事件监听 EventBus.once('id', (id: string) => { ToastUtil.showToast(`单次ID: ${id}`); }); //发布普通消息 EventBus.post('id', '100001200'); //发布粘性消息 EventBus.postSticky('id', '100001201'); //发布跨App消息 EventBus.postApp('id', '100001202'); //获取粘性事件数据 let sticky = EventBus.getSticky('id'); ToastUtil.showToast(`粘性事件数据：${sticky}`); //移除粘性事件 EventBus.removeSticky('id'); ToastUtil.showToast(`移除粘性事件成功！`); //注销事件监听 EventBus.off('id'); //注销所有事件监听 EventBus.offAll();
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Full Code Example 

import { router } from '@kit.ArkUI'; import { TitleBarView } from '../../component/TitleBarView'; import { DescribeBean } from '../../model/DescribeBean'; import { EventBus } from '@nutpi/eventbus'; import { ToastUtil } from '@pura/harmony-utils'; import { DialogHelper } from '@pura/harmony-dialog'; /** * @nutpi/eventbus，使用案例 */ @Entry @ComponentV2 export struct EventBusPage { private scroller: Scroller = new Scroller(); @Local describe: DescribeBean = router.getParams() as DescribeBean; @Local txtStr: string = ""; build() { Column() { TitleBarView({ describe: this.describe }) Divider() Scroll(this.scroller) { Column({ space: 5 }) { Button("on()") .btnStyle() .onClick(() => { //注册事件监听 EventBus.on('id', (id: string) => { DialogHelper.showAlertDialog({ autoCancel: false, backCancel: false, content: `ID: ${id}`, primaryButton: '已收到', onAction: (action, id) => { DialogHelper.closeDialog(id); } }); }); ToastUtil.showToast(`注册事件监听成功！`); }) Button("once()") .btnStyle() .onClick(() => { //注册单次事件监听 EventBus.once('id', (id: string) => { DialogHelper.showAlertDialog({ autoCancel: false, backCancel: false, content: `单次ID: ${id}`, primaryButton: '已收到', onAction: (action, id) => { DialogHelper.closeDialog(id); } }); }); ToastUtil.showToast(`注册单次事件监听成功！`); }) Button("post()") .btnStyle() .onClick(() => { EventBus.post('id', '100001200'); ToastUtil.showToast(`发布普通消息！`); }) Button("postSticky()") .btnStyle() .onClick(() => { EventBus.postSticky('id', '100001201'); ToastUtil.showToast(`发布粘性消息！`); }) Button("getSticky()") .btnStyle() .onClick(() => { let sticky = EventBus.getSticky('id'); ToastUtil.showToast(`粘性事件数据：${sticky}`); }) Button("removeSticky()") .btnStyle() .onClick(() => { EventBus.removeSticky('id'); ToastUtil.showToast(`移除粘性事件成功！`); }) Button("postApp()") .btnStyle() .onClick(() => { EventBus.postApp('id', '100001202'); ToastUtil.showToast(`发布跨App消息！`); }) Button("off()") .btnStyle() .onClick(() => { //注销事件监听 EventBus.off('id'); ToastUtil.showToast(`注销事件监听！`); }) Button("offAll()") .btnStyle() .onClick(() => { //注销所有事件监听 EventBus.offAll(); ToastUtil.showToast(`注销所有事件监听！`); }) Blank().layoutWeight(1) } .margin({ top: 5, bottom: 5 }) } .layoutWeight(1) } .width('100%') .height('100%') .backgroundColor($r('app.color.main_background')) } } @Styles function btnStyle() { .width('90%') .margin({ top: 10, bottom: 5 }) }
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🍎Communication and communication 🙏

Any problems found during use can be askedIssueGive us;
Of course, we also welcome you to send us a messagePR 。

🌏Open Source Protocol

This project is based onApache License 2.0, when copying and borrowing codes, please be sure to indicate the source.

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