Package com.vaadin.collaborationengine

Class CollaborationMessageList

java.lang.Object
com.vaadin.flow.component.Component
com.vaadin.flow.component.Composite<MessageList>
com.vaadin.collaborationengine.CollaborationMessageList
All Implemented Interfaces:
AttachNotifier, DetachNotifier, HasElement, HasSize, HasStyle, Serializable
public class CollaborationMessageList extends Composite<MessageList> implements HasSize, HasStyle
Extension of the MessageList component which integrates with the CollaborationEngine. It reads the messages from a topic and renders them within the component. The list is automatically updated when new messages are available. You can use the CollaborationMessageInput component for submitting messages.
Since:
3.1
Author:
Vaadin Ltd
See Also:

  • Constructor Details

    • CollaborationMessageList

      public CollaborationMessageList(UserInfo localUser, String topicId)
      Creates a new collaboration message list component with the provided topic id.

      It renders messages received by a CollaborationMessageInput or a custom submitter component connected to this list via setSubmitter(CollaborationMessageSubmitter)

      If a null topic id is provided, the component won't display any messages, until connecting to a non-null topic with setTopic(String).

      Parameters:
      localUser - the information of the end user, not null
      topicId - the id of the topic to connect to, or null to not connect the component to any topic

    • CollaborationMessageList

      public CollaborationMessageList(UserInfo localUser, String topicId, CollaborationMessagePersister persister)
      Creates a new collaboration message list component with the provided topic id and persister of CollaborationMessage items from/to an external source (e.g. a database).

      It renders messages received by a CollaborationMessageInput or a custom submitter component connected to this list via setSubmitter(CollaborationMessageSubmitter)

      If a null topic id is provided, the component won't display any messages, until connecting to a non-null topic with setTopic(String).

      Parameters:
      localUser - the information of the end user, not null
      topicId - the id of the topic to connect to, or null to not connect the component to any topic
      persister - the persister to read/write messages to an external source

  • Method Details

    • setTopic

      public void setTopic(String topicId)
      Sets the topic to use with this component. The connection to the previous topic (if any) and existing messages are removed. A connection to the new topic is opened and the list of messages in the new topic are populated to this component.

      If the topic id is null, no messages will be displayed.

      Parameters:
      topicId - the topic id to use, or null to not use any topic

    • setSubmitter

      public void setSubmitter(CollaborationMessageSubmitter submitter)
      Sets a submitter to handle the append of messages to the list. It can be used to connect a custom input component as an alternative to the provided CollaborationMessageInput. If set to null the existing submitter will be disconnected from the list.
      Parameters:
      submitter - the submitter, or null to remove the current submitter

    • setImageProvider

      public void setImageProvider(CollaborationAvatarGroup.ImageProvider imageProvider)
      Sets an image provider callback for dynamically loading avatar images for a given user. The image can be loaded on-demand from a database or using any other source of IO streams.

      If no image callback is defined, then the image URL defined by UserInfo.getImage() is directly passed to the browser. This means that avatar images need to be available as static files or served dynamically from a custom servlet. This is the default.

      Usage example: 

       collaborationMessageList.setImageProvider(userInfo -> {
     StreamResource streamResource = new StreamResource(
             "avatar_" + userInfo.getId(), () -> {
                 User userEntity = userRepository
                         .findById(userInfo.getId());
                 byte[] profilePicture = userEntity.getProfilePicture();
                 return new ByteArrayInputStream(profilePicture);
             });
     streamResource.setContentType("image/png");
     return streamResource;
 });
      Parameters:
      imageProvider - the image provider to use, or null to use image URLs directly from the user info object

    • getImageProvider

      public CollaborationAvatarGroup.ImageProvider getImageProvider()
      Gets the currently used image provider callback.
      Returns:
      the current image provider callback, or null if no callback is set
      See Also:

    • setMessageConfigurator

      public void setMessageConfigurator(CollaborationMessageList.MessageConfigurator messageConfigurator)
      Sets a configurator callback for the messages. It can be used for customizing the properties of the MessageListItem objects after the component has generated them, before sending them to the user's browser.

      Usage example: 

       messageList.setMessageConfigurator((message, user) -> {
     message.setUserName(user.getName().toUpperCase());
 });
      Parameters:
      messageConfigurator - the configurator to set, or null to remove the current configurator

    • getMessageConfigurator

      public CollaborationMessageList.MessageConfigurator getMessageConfigurator()
      Gets the current message configurator, if any.
      Returns:
      the current message configurator, or null if none has been set
      See Also: