stream-chat-react-native-core/lib/module/state-store/message-list-prev-next-state.js

The official React Native and Expo components for Stream Chat, a service for building chat applications

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.MessagePreviousAndNextMessageStore = void 0;
var _streamChat = require("stream-chat");
var INITIAL_STATE = {
  messageList: {}
};
class MessagePreviousAndNextMessageStore {
  constructor() {
    this.state = new _streamChat.StateStore(INITIAL_STATE);
  }
  setMessageListPreviousAndNextMessage({
    messages,
    isFlashList = true
  }) {
    var currentValue = this.state.getLatestValue();
    var prevMessageList = currentValue.messageList;
    var newMessageList = {};
    for (var i = 0; i < messages.length; i++) {
      var message = messages[i];
      var previousMessage = isFlashList ? messages[i - 1] : messages[i + 1];
      var nextMessage = isFlashList ? messages[i + 1] : messages[i - 1];
      var existing = prevMessageList[message.id];
      if (existing && existing.previousMessage === previousMessage && existing.nextMessage === nextMessage) {
        newMessageList[message.id] = existing;
      } else {
        newMessageList[message.id] = {
          nextMessage,
          previousMessage
        };
      }
    }
    this.state.partialNext({
      messageList: newMessageList
    });
  }
}
exports.MessagePreviousAndNextMessageStore = MessagePreviousAndNextMessageStore;
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