private async void btnChat_Click(object sender, EventArgs e)
{
if (lstPeers.SelectedIndex == -1)
{
MessageBox.Show("Please select a peer.");
return;
}
Peer remotePeer = Peer.CreateFromString(lstPeers.GetItemText(lstPeers.SelectedItem));
_httpSignaler.SendToPeer(remotePeer.Id, "OpenDataChannel");
await SetupPeer(remotePeer, true);
}
private async Task SetupPeer(Peer remotePeer, bool isInitiator)
{
var found = lstPeers.FindString(remotePeer.ToString());
if (ListBox.NoMatches != found)
{
remotePeer = Peer.CreateFromString(lstPeers.GetItemText(lstPeers.Items[found]));
}
Tuple <OrtcController, ChatForm> tuple;
if (_chatSessions.TryGetValue(remotePeer.Id, out tuple))
{
// already have a form created
tuple.Item2.HandleRemotePeerDisconnected();
tuple.Item2.BringToFront();
tuple.Item1.Dispose();
_chatSessions.Remove(remotePeer.Id);
}
else
{
if (!Properties.Settings.Default.MultipleConnections)
{
if (_chatSessions.Count > 0)
{
// Clear out existing chat forms as only one chat form
// is allowed.
DisposeChatForms();
}
}
// no chat form created, spawn a new one
tuple = new Tuple <OrtcController, ChatForm>(null, new ChatForm(OrtcController.LocalPeer, remotePeer));
tuple.Item2.SendMessageToRemotePeer += ChatForm_SendMessageToRemotePeer;
// Invoking .ShowDialog() would block the signaler's task
// being waited upon. Show() block the current task
// from continuing until the dialog is dismissed but does
// not block other events from processing on the GUI
// thread. Not blocking events is insufficient though. The
// task is waited by the signaler to complete before the
// next signaler message from the server is allowed to be
// processed so a dialog cannot be spawned from within the
// processing of a peer's message task.
//
// The solution though to the blocking of the signaler's
// task when bringing up a dialog is rather simple: invoke
// the .ShowDialog() method asynchronously on the GUI
// thread and not from within the current signaler message
// task. This allows the GUI to be displayed and events are
// processed as normal including other signaler messages
// from peers.
BeginInvoke((Action)(() =>
{
if (Properties.Settings.Default.MultipleConnections)
{
// show the form non model
tuple.Item2.Show();
}
else
{
// invoke this on the main thread without blocking the
// current thread from continuing
tuple.Item2.ShowDialog();
}
}));
}
// create a new tuple and carry forward the chat form from the previous tuple
tuple = new Tuple <OrtcController, ChatForm>(new OrtcController(remotePeer, isInitiator), tuple.Item2);
_chatSessions.Add(remotePeer.Id, tuple);
tuple.Item1.DataChannelConnected += OrtcSignaler_OnDataChannelConnected;
tuple.Item1.DataChannelDisconnected += OrtcSignaler_OnDataChannelDisconnected;
tuple.Item1.SignalMessageToPeer += OrtcSignaler_OnSignalMessageToPeer;
tuple.Item1.DataChannelMessage += OrtcSignaler_OnDataChannelMessage;
await tuple.Item1.SetupAsync();
}