public ChatPage(ViewModel.ChatViewModel viewModel)
{
InitializeComponent();
SetupComponents(viewModel);
App.Instance.Connector.StateChanged += OnBackendStateChanged;
}
private void StartSession(string sessionId, byte[] memberKey)
{
if (memberKey == null)
{
memberKey = model.GetMemberKey(sessionId);
}
Task.Run(async() =>
{
chatViewModel = new ViewModel.ChatViewModel();
bool success = await chatViewModel.Model.Join(memberKey);
Device.BeginInvokeOnMainThread(async() =>
{
if (success)
{
//await Navigation.PopModalAsync();
await Navigation.PushModalAsync(chatViewModel.View, true);
}
else
{
IMessage messageHandler = DependencyService.Get <IMessage>();
messageHandler?.ShowToast("Unable open chat session");
chatViewModel.Model.CloseSession();
}
});
});
}
private void SetupComponents(ViewModel.ChatViewModel viewModel)
{
model = viewModel.Model;
messageList.ItemsSource = viewModel.Messages;
Appearing += delegate
{
textArea.Focus();
};
messageList.ItemTapped += (object sender, ItemTappedEventArgs e) =>
{
if (e.Item == null)
{
return;
}
messageList.SelectedItem = null;
};
textArea.Completed += delegate
{
SubmitMessage();
};
sendButton.Clicked += delegate
{
SubmitMessage();
};
shareButton.Clicked += async(object sender, EventArgs args) =>
{
try
{
FileData fileData = await CrossFilePicker.Current.PickFile();
if (fileData == null)
{
return; // user canceled file picking
}
if (fileData.FileName.EndsWith("jpg", StringComparison.Ordinal) ||
fileData.FileName.EndsWith("png", StringComparison.Ordinal))
{
model.PushImage(fileData.DataArray);
}
}
catch (Exception ex)
{
System.Console.WriteLine("Exception choosing file: " + ex.ToString());
}
};
viewModel.Messages.CollectionChanged += (object sender, NotifyCollectionChangedEventArgs e) =>
{
for (int i = e.NewStartingIndex; i < e.NewItems.Count; ++i)
{
(e.NewItems[i] as ViewModel.ChatMessage).PropertyChanged += (object s, PropertyChangedEventArgs ev) =>
{
if (ev.PropertyName == "IsForeign") // Trigger a template update
{
Device.BeginInvokeOnMainThread(() =>
{
// Trigger an update
messageList.ItemsSource = null;
messageList.ItemsSource = viewModel.Messages;
});
}
};
}
if (e.NewItems != null && (e.OldItems == null || e.NewItems.Count > e.OldItems.Count))
{
Device.BeginInvokeOnMainThread(() =>
{
//ForceLayout();
messageList.ScrollTo(viewModel.Messages.LastOrDefault(), ScrollToPosition.End, true);
});
}
};
}