How can I handle changing PageModel in code-behind?

Question

I have a Xamarin.Forms application using FreshMVVM. Can anybody tell me if I can use binding to handle changing the PageModel in Page's code-behind? E.g. if an event happens in the PageModel like this:

public class VideoCallPageModel : BasePageModel
{
    SignalRService signalR;
 ...

    public async override void Init(object initData)
    {
        base.Init(initData);

        signalR = new SignalRService();
        signalR.OnIncomingCall += SignalR_IncomingCall;
        ...

    private void SignalR_IncomingCall(object sender, VideoCallPeer peer)
    {
        ...
    }

So I need to handle in Page's code-behind firing this OnIncomingCall event. Is it possible?

Answer 1

define a custom event in your model

public delegate void IncomingCallHandler(object sender, VideoCallPeer e);
public event IncomingCallHandler OnIncomingCall;

private void SignalR_IncomingCall(object sender, VideoCallPeer peer)
{  
    if (OnIncomingCall == null) return;
    
    OnIncomingCall(this, peer);
}

then your page can subscribe to it with an event handler