Events

The CometChat Calls SDK provides two ways to listen for call events: the OngoingCallListener class for legacy-style callbacks, and the addEventListener method for modern event subscriptions.

OngoingCallListener

The OngoingCallListener class provides callbacks for call events. Pass it to CallSettingsBuilder.setCallEventListener():

import { CometChatCalls } from '@cometchat/calls-sdk-react-native';

const callListener = new CometChatCalls.OngoingCallListener({
  onUserJoined: (user) => {
    console.log('User joined:', user);
  },
  onUserLeft: (user) => {
    console.log('User left:', user);
  },
  onUserListUpdated: (userList) => {
    console.log('User list updated:', userList);
  },
  onCallEnded: () => {
    console.log('Call ended');
  },
  onCallEndButtonPressed: () => {
    console.log('End call button pressed');
  },
  onSessionTimeout: () => {
    console.log('Session timed out');
  },
  onError: (error) => {
    console.error('Call error:', error);
  },
  onAudioModesUpdated: (audioModes) => {
    console.log('Audio modes updated:', audioModes);
  },
  onRecordingStarted: (data) => {
    console.log('Recording started:', data);
  },
  onRecordingStopped: (data) => {
    console.log('Recording stopped:', data);
  },
  onUserMuted: (user) => {
    console.log('User muted:', user);
  },
  onCallSwitchedToVideo: (data) => {
    console.log('Call switched to video:', data);
  },
});

const callSettings = new CometChatCalls.CallSettingsBuilder()
  .setCallEventListener(callListener)
  .build();

OngoingCallListener Events

Event	Payload	Description
onUserJoined	User object	A user joined the call
onUserLeft	User object	A user left the call
onUserListUpdated	User array	The participant list changed
onCallEnded	-	The call has ended
onCallEndButtonPressed	-	The end call button was pressed
onSessionTimeout	-	The session timed out due to inactivity
onError	Error object	An error occurred
onAudioModesUpdated	Audio modes array	Available audio modes changed
onRecordingStarted	Recording data	Recording has started
onRecordingStopped	Recording data	Recording has stopped
onUserMuted	User object	A user was muted
onCallSwitchedToVideo	Session data	An audio call was switched to video

addEventListener

For more granular control, use CometChatCalls.addEventListener() to subscribe to specific events:

const unsubscribe = CometChatCalls.addEventListener('onParticipantJoined', (participant) => {
  console.log('Participant joined:', participant);
});

// Later, unsubscribe when no longer needed
unsubscribe();

Session Status Events

Event	Payload	Description
onSessionJoined	-	Successfully joined the session
onSessionLeft	-	Left the session
onConnectionLost	-	Connection to the session was lost
onConnectionRestored	-	Connection was restored
onConnectionClosed	-	Connection was closed
onSessionTimedOut	-	Session timed out due to inactivity

CometChatCalls.addEventListener('onSessionJoined', () => {
  console.log('Successfully joined the session');
});

CometChatCalls.addEventListener('onSessionLeft', () => {
  console.log('Left the session');
});

CometChatCalls.addEventListener('onConnectionLost', () => {
  console.log('Connection lost - attempting to reconnect');
});

CometChatCalls.addEventListener('onConnectionRestored', () => {
  console.log('Connection restored');
});

CometChatCalls.addEventListener('onSessionTimedOut', () => {
  console.log('Session timed out');
});

Media Events

Event	Payload	Description
onAudioMuted	-	Local audio was muted
onAudioUnMuted	-	Local audio was unmuted
onVideoPaused	-	Local video was paused
onVideoResumed	-	Local video was resumed
onRecordingStarted	-	Recording started
onRecordingStopped	-	Recording stopped
onScreenShareStarted	-	Screen sharing started
onScreenShareStopped	-	Screen sharing stopped
onAudioModeChanged	Audio mode	Audio output mode changed
onCameraFacingChanged	Camera facing	Camera switched (front/rear)

CometChatCalls.addEventListener('onAudioMuted', () => {
  console.log('Audio muted');
});

CometChatCalls.addEventListener('onAudioUnMuted', () => {
  console.log('Audio unmuted');
});

CometChatCalls.addEventListener('onVideoPaused', () => {
  console.log('Video paused');
});

CometChatCalls.addEventListener('onVideoResumed', () => {
  console.log('Video resumed');
});

CometChatCalls.addEventListener('onAudioModeChanged', (mode) => {
  console.log('Audio mode changed to:', mode);
});

CometChatCalls.addEventListener('onCameraFacingChanged', (facing) => {
  console.log('Camera facing:', facing); // 'FRONT' or 'REAR'
});

Participant Events

Event	Payload	Description
onParticipantJoined	Participant	A participant joined
onParticipantLeft	Participant	A participant left
onParticipantAudioMuted	Participant	A participant muted their audio
onParticipantAudioUnmuted	Participant	A participant unmuted their audio
onParticipantVideoPaused	Participant	A participant paused their video
onParticipantVideoResumed	Participant	A participant resumed their video
onParticipantHandRaised	Participant	A participant raised their hand
onParticipantHandLowered	Participant	A participant lowered their hand
onParticipantStartedScreenShare	Participant	A participant started screen sharing
onParticipantStoppedScreenShare	Participant	A participant stopped screen sharing
onParticipantStartedRecording	Participant	A participant started recording
onParticipantStoppedRecording	Participant	A participant stopped recording
onDominantSpeakerChanged	Participant	The dominant speaker changed
onParticipantListChanged	Participant array	The participant list changed

CometChatCalls.addEventListener('onParticipantJoined', (participant) => {
  console.log('Participant joined:', participant.name);
});

CometChatCalls.addEventListener('onParticipantLeft', (participant) => {
  console.log('Participant left:', participant.name);
});

CometChatCalls.addEventListener('onParticipantListChanged', (participants) => {
  console.log('Total participants:', participants.length);
});

CometChatCalls.addEventListener('onParticipantHandRaised', (participant) => {
  console.log('Hand raised by:', participant.name);
});

CometChatCalls.addEventListener('onDominantSpeakerChanged', (participant) => {
  console.log('Dominant speaker:', participant.name);
});

Button Click Events

Event	Payload	Description
onLeaveSessionButtonClicked	-	Leave session button clicked
onRaiseHandButtonClicked	-	Raise hand button clicked
onShareInviteButtonClicked	-	Share invite button clicked
onChangeLayoutButtonClicked	-	Change layout button clicked
onParticipantListButtonClicked	-	Participant list button clicked
onToggleAudioButtonClicked	-	Toggle audio button clicked
onToggleVideoButtonClicked	-	Toggle video button clicked
onRecordingToggleButtonClicked	-	Recording toggle button clicked
onScreenShareButtonClicked	-	Screen share button clicked
onChatButtonClicked	-	Chat button clicked
onSwitchCameraButtonClicked	-	Switch camera button clicked

CometChatCalls.addEventListener('onLeaveSessionButtonClicked', () => {
  console.log('Leave button clicked');
  // Handle leave confirmation
});

CometChatCalls.addEventListener('onChatButtonClicked', () => {
  console.log('Chat button clicked');
  // Open chat interface
});

Layout Events

Event	Payload	Description
onCallLayoutChanged	Layout	The call layout changed
onParticipantListVisible	-	Participant list became visible
onParticipantListHidden	-	Participant list was hidden
onPictureInPictureLayoutEnabled	-	PiP mode was enabled
onPictureInPictureLayoutDisabled	-	PiP mode was disabled

CometChatCalls.addEventListener('onCallLayoutChanged', (layout) => {
  console.log('Layout changed to:', layout); // 'TILE', 'SIDEBAR', or 'SPOTLIGHT'
});

CometChatCalls.addEventListener('onPictureInPictureLayoutEnabled', () => {
  console.log('PiP enabled');
});

Participant Object

The participant object contains:

Property	Type	Description
pid	string	Participant ID
uid	string	User ID
name	string	Display name
avatar	string	Avatar URL (optional)

Complete Example

import React, { useEffect, useRef } from 'react';
import { CometChatCalls } from '@cometchat/calls-sdk-react-native';

function useCallEvents(onCallEnd: () => void) {
  const unsubscribersRef = useRef<Array<() => void>>([]);

  useEffect(() => {
    // Session events
    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onSessionJoined', () => {
        console.log('Joined session');
      })
    );

    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onSessionLeft', () => {
        console.log('Left session');
        onCallEnd();
      })
    );

    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onSessionTimedOut', () => {
        console.log('Session timed out');
        onCallEnd();
      })
    );

    // Participant events
    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onParticipantJoined', (participant) => {
        console.log(`${participant.name} joined`);
      })
    );

    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onParticipantLeft', (participant) => {
        console.log(`${participant.name} left`);
      })
    );

    // Media events
    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onAudioModeChanged', (mode) => {
        console.log('Audio mode:', mode);
      })
    );

    // Layout events
    unsubscribersRef.current.push(
      CometChatCalls.addEventListener('onCallLayoutChanged', (layout) => {
        console.log('Layout:', layout);
      })
    );

    // Cleanup
    return () => {
      unsubscribersRef.current.forEach((unsubscribe) => unsubscribe());
      unsubscribersRef.current = [];
    };
  }, [onCallEnd]);
}

export default useCallEvents;

Related Documentation

• Actions - Control the call programmatically
• Session Settings - Configure event listeners
• Participant Management - Manage participants