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自定义消息和 provider

1. 自定义消息​

1.1 编写自定义普通消息的代码​

import { MessageTag, MessageContent, MessageFlag, JsonConverter } from '@rongcloud/imkit';

/**
 * 消息标识
 * @version 1.0.0
 */
export const CustomTextMessageObjectName = "RCD:TstMsg";

/**
 * 自定义文本消息
 *
 */

@MessageTag(CustomTextMessageObjectName, MessageFlag.Count)
export class CustomTextMessage extends MessageContent {
  // 文本内容
  content: string = '';

  constructor() {
    super();
  }

  encode(): string {
    let map = super.encodeBaseData();
    // 将文本内容放到字典
    map.set('content', this.content)

    return JsonConverter.stringifyFromHashMap(map);
  }

  decode(contentString: string): void {
    let hashMap = JsonConverter.parseToHashMap(contentString);
    super.decodeBaseData(hashMap);
    // 将文本内容从字典中解出
    if (hashMap.get("content")) {
      this.content = hashMap.get("content") as string;
    }
  }

  getClassName(): string {
    return CustomTextMessage.name
  }
}

1.2 编写自定义小灰条消息的代码​

/**
 * @date 2024/12/16
 * @author 融云
 */
import { JsonConverter, MessageContent, MessageFlag, MessageTag, StringChecker } from '@rongcloud/imlib';

export const CustomInfoMessageObjectName = "RCD:InfoMsg";

/**
 * 自定义小灰条消息
 */
@MessageTag(CustomInfoMessageObjectName, MessageFlag.Save)
export class CustomInfoMessage extends MessageContent {
  /**
   * 小灰条内容
   */
  message: string = "";

  constructor() {
    super();
  }

  encode(): string {
    let map = super.encodeBaseData();
    if (StringChecker.isValid(this.message)) {
      map.set("message", this.message);
    }
    return JsonConverter.stringifyFromHashMap(map);
  }

  decode(contentString: string): void {
    let map = JsonConverter.parseToHashMap(contentString);
    super.decodeBaseData(map);

    if (map.get("message")) {
      this.message = map.get("message") as string;
    }
  }

  getClassName(): string {
    return CustomInfoMessage.name;
  }
}

1.3 将消息注册给 IMLib​

消息注册给 IMLib，保证消息能够正常的收发

let clazzList : List<MessageContentConstructor> = new List();
clazzList.add(CustomTextMessage);
clazzList.add(CustomInfoMessage);
IMEngine.getInstance().registerMessageType(clazzList);

2. 自定义消息 provider​

只有需要 UI 展示的消息需要写 provider

2.1 编写普通消息 provider​

普通消息是指带头像的消息，例如常见的文本图片等

/**
 * Created on 2024/07/09
 * @author 融云
 */
import { BaseMessageItemProvider, MessageBubbleView, UiMessage } from '@rongcloud/imkit';
import { CustomTextMessage } from '../message/CustomTextMessaget';

export class CustomTextMessageItemProvider extends BaseMessageItemProvider<CustomTextMessage> {
  public getMessageWrapBuilder(): WrappedBuilder<[Context, UiMessage, number]> {
    return wrapBuilder(bindTextMessageData);
  }

  public isShowSummaryName(context: Context, messageContent: CustomTextMessage): boolean {
    return true;
  }

  public getSummaryTextByMessageContent(context: Context,
    messageContent: CustomTextMessage): Promise<MutableStyledString> {
    return new Promise((resolve) => {
      let content = messageContent.content;
      if (content.concat("\n")) {
        content = content.replaceAll("\n", " ");
      }
      resolve(new MutableStyledString(content));
    });
  }
}

@Builder
export function bindTextMessageData(context: Context, uiMessage: UiMessage, position: number) {
  CustomTextMessageView({ uiMessage: uiMessage })
}

@Component
export struct CustomTextMessageView {
  @ObjectLink uiMessage: UiMessage
  private textMessage: CustomTextMessage = new CustomTextMessage()
  controller: TextController = new TextController();
  @State isClickLook: boolean = false // 是否点击了查看
  private styledString: MutableStyledString = new MutableStyledString('')

  aboutToAppear(): void {
    this.textMessage = this.uiMessage.message.content as CustomTextMessage
  }

  build() {
    MessageBubbleView({
      uiMessage: this.uiMessage,
      userInfo: this.uiMessage.senderInfo
    }) {
      // 普通模式
      Text(undefined, { controller: this.controller }).
        fontSize(17).
        fontColor($r('app.color.rc_color_111F2C')).
        lineHeight(21).
        margin(10).
        onAttach(() => {
          //先让其显示内容
          this.styledString = new MutableStyledString(this.textMessage.content);
          this.controller.setStyledString(this.styledString);
        })
    }
  }
}

2.2 编写小灰条消息 provider​

小灰条消息一般居中显示，无头像，常见的比如撤回消息

import { BaseNotificationMessageItemProvider, UiMessage } from "@rongcloud/imkit";
import { CustomInfoMessage } from "../message/CustomInfoMessage";

/**
 * 自定义小灰条消息 provider
 */
export class CustomInfoMessageProvider extends BaseNotificationMessageItemProvider<CustomInfoMessage> {
  public getMessageWrapBuilder(): WrappedBuilder<[Context, UiMessage, number]> {
    return wrapBuilder(bindMessageData);
  }

  public getSummaryTextByMessageContent(context: Context,
    messageContent: CustomInfoMessage): Promise<MutableStyledString> {
    return new Promise((resolve, reject) => {
      resolve(new MutableStyledString(messageContent.message));
    });
  }
}

@Builder
export function bindMessageData(context: Context, messageModel: UiMessage, position: number) {
  InfoMessageView({ context: context, messageModel: messageModel})
}


@Component
struct InfoMessageView {
  @Require @Prop context: Context;
  @ObjectLink messageModel: UiMessage
  private messageContent: CustomInfoMessage = new CustomInfoMessage();

  aboutToAppear(): void {
    this.messageContent = this.messageModel.message.content as CustomInfoMessage;
  }
  build() {
    Row() {
      Text(this.messageContent.message).
        backgroundColor($r('app.color.rc_color_EDEDED')).
        borderRadius(8).
        fontSize(14).
        fontColor($r('app.color.rc_color_85909C')).
        padding(10)
    }.margin({ top: 10, bottom: 10 }).justifyContent(FlexAlign.Center).alignItems(VerticalAlign.Center).width('100%')
  }
}

2.3 将消息和 provider 进行绑定​

将消息和 provider 进行绑定，保证该消息能在 UI 上正常展示

// 获取会话服务
let conversationService = RongIM.getInstance().conversationService()

// 注册自定义文本消息和 provider 给 IMKit，方便聊天页面 UI 展示
conversationService.addMessageItemProvider(CustomTextMessageObjectName, new CustomTextMessageItemProvider())

// 注册自定义小灰条消息和 provider 给 IMKit，方便聊天页面 UI 展示
conversationService.addMessageItemProvider(CustomInfoMessageObjectName, new CustomInfoMessageProvider());

3. 使用自定义消息​

3.1 自定义普通消息​

let conId = new ConversationIdentifier();
conId.conversationType = ConversationType.Private;
conId.targetId = "会话 Id";

let textMsg = new CustomTextMessage();
textMsg.content = '自定义文本消息'

let msg = new Message(conId, textMsg);

RongIM.getInstance().messageService().sendMessage(msg).then((result: IAsyncResult<Message>) => {
  if (result.code === EngineError.Success) {
    promptAction.showToast({
      message: "发送自定义文本消息成功",
      bottom: 400,
    })
  }
})

3.2 自定义小灰条消息​

let conId = new ConversationIdentifier();
conId.conversationType = ConversationType.Private;
conId.targetId = "会话 Id";

let infoMsg = new CustomInfoMessage();
infoMsg.message = "自定义小灰条消息";
let msg = new Message(conId, infoMsg);

RongIM.getInstance().messageService().sendMessage(msg).then((result: IAsyncResult<Message>) => {
  if (result.code === EngineError.Success) {
    promptAction.showToast({
      message: "发送自定义小灰条消息成功",
      bottom: 400,
    })
  }
})
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