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MatriX vNext isComposing functions
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Govardhan N 2018-04-30, 15:53 #1
Member since Mar 2018 · 10 posts
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Subject: MatriX vNext isComposing functions
Hi Alex,

I am trying to use Event.IsComposing, Event.IsDelivered event to show that the user is typing(similar to whatsapp) like this

  1. xmppClient.XmppXElementStreamObserver.Where(el => el.OfType<Matrix.Xmpp.MessageEvents.Event>()).Subscribe(el =>
  2. {                    
  3.        Matrix.Xmpp.MessageEvents.Event incomingMessage = el.Cast<Matrix.Xmpp.MessageEvents.Event>();
  4.  });

This event is initialized, but not triggered for incoming messages.

Can you help me how to trigger these events to show that the user is typing(similar to whatsapp) in my app ?
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Alex 2018-04-30, 16:50 #2
Member since Feb 2003 · 4449 posts · Location: Germany
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A composing stanza looks like this:

  1. <message to='romeo@montague.net' id='message22'>
  2.  <body>Art thou not Romeo, and a Montague?</body>
  3.  <x xmlns='jabber:x:event'>
  4.     <composing/>
  5.  </x>
  6. </message>

The composing event tag <x xmlns='jabber:x:event'/> is a children of the <message/> tag.

So your code has to look like this:

  1. xmppClient
  2.     .XmppXElementStreamObserver
  3.     .Where(el =>
  4.         el.OfType<Message>()
  5.         && el.Element<Matrix.Xmpp.MessageEvents.Event>() != null                  
  6.  
  7.         )
  8.     .Subscribe(el =>
  9.     {
  10.         var msg = el.Cast<Message>();
  11.         var evt = el.Element<Matrix.Xmpp.MessageEvents.Event>();
  12.     });
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Govardhan N 2018-05-02, 09:55 #3
Member since Mar 2018 · 10 posts
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Thanks for the solution Alex. It works.

To get the message delivered status, do we need to manually send the delivery status for each received messages or can we get automatically when event is initialized?
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Alex 2018-05-02, 11:31 #4
Member since Feb 2003 · 4449 posts · Location: Germany
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You have to send those events on your own.
You can also write your own handler an add it to the channel pipeline as described here:
https://matrix-xmpp.io/docs/handlers
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