private void SetHubConnectionHandlerToRecieveLeftBehindMessages(string yourPhoneNumber, Page chatPage, Friend friendChattingWith)
{
ScrollView scrollViewChatMsgArea = (ScrollView)chatPage.FindByName("scrollViewChatMsgArea");
StackLayout chat_messages_area = (StackLayout)chatPage.FindByName("chat_messages_area");
hubConnection.On <List <ChatMessage> >(yourPhoneNumber + "-left_behind", async(leftBehindChatMessages) =>
{
List <PrimaryKeyLeftBehindMsg> listOfPrimaryKeysForLeftBehindMsgs = new List <PrimaryKeyLeftBehindMsg>(); //Used to tell chatchub that messages have been received
foreach (ChatMessage leftBehindChatMsg in leftBehindChatMessages)
{
if ((leftBehindChatMsg.SeenByRecipient).Equals("no"))
{
//PLACE THE LEFT BEHIND MESSAGE IN YOUR CHAT AREA
leftBehindChatMsg.Writer = "Friend";
ChatMessageLabelGenerator.CreateAndDisplayChatMessageLabel(leftBehindChatMsg, friendChattingWith, chat_messages_area);
scrollViewChatMsgArea.ScrollToAsync(chat_messages_area, ScrollToPosition.End, false);
//PLACE THE MESSAGE IN YOUR DATABASE
await PlaceChatMessageInDatabase(leftBehindChatMsg.Msg, "Friend", friendChattingWith);
//PLACE THE PRIMARY KEY OF THIS MESSAGE IN A LIST
PrimaryKeyLeftBehindMsg primaryKey = new PrimaryKeyLeftBehindMsg();
primaryKey.MsgID = leftBehindChatMsg.MsgID; primaryKey.PhoneNumWriter = leftBehindChatMsg.PhoneNumOfWriter;
listOfPrimaryKeysForLeftBehindMsgs.Add(primaryKey);
}
}
//TELL CHAT HUB THAT THESE LEFT BEHIND MESSAGES HAVE BEEN RECEIVED
await hubConnection.InvokeAsync("MessagesReceived", yourPhoneNumber, listOfPrimaryKeysForLeftBehindMsgs);
});
}
private void SetHubConnectionhandlerToRecieveChatMsg(string yourPhoneNumber, Page chatPage, Friend friendChattingWith)
{
hubConnection.On <ChatMessage>(yourPhoneNumber, async(chatMessage) =>
{
//Friend friendChattingWith = (Friend)BindingContext;
if (friendChattingWith.ID == chatMessage.PhoneNumOfWriter) //if the person's phone # that sent me the message is = to the phone # of the person i started the chat with
{
ScrollView scrollViewChatMsgArea = (ScrollView)chatPage.FindByName("scrollViewChatMsgArea");
StackLayout chat_messages_area = (StackLayout)chatPage.FindByName("chat_messages_area");
//CREATE AND DISPLAY THE CHAT MESSAGE THAT WAS RECIEVED
chatMessage.Writer = "Friend";
ChatMessageLabelGenerator.CreateAndDisplayChatMessageLabel(chatMessage, friendChattingWith, chat_messages_area);
//SCROLL TO THE END POSITION OF THE SCROLL VIEW SO WE CAN SEE THE MESSAGE ADDED
scrollViewChatMsgArea.ScrollToAsync(chat_messages_area, ScrollToPosition.End, false);
//PLACE THE MESSAGE RECEIVED IN THE DATABASE
await PlaceChatMessageInDatabase(chatMessage.Msg, "Friend", friendChattingWith);
//TELL THE HUB I RECEIVED THE MESSAGE
List <PrimaryKeyLeftBehindMsg> listOfPrimaryKeysForLeftBehindMsgs = new List <PrimaryKeyLeftBehindMsg>();
PrimaryKeyLeftBehindMsg primaryKey = new PrimaryKeyLeftBehindMsg();
primaryKey.MsgID = chatMessage.MsgID; primaryKey.PhoneNumWriter = chatMessage.PhoneNumOfWriter;
listOfPrimaryKeysForLeftBehindMsgs.Add(primaryKey);
await hubConnection.InvokeAsync("MessagesReceived", yourPhoneNumber, listOfPrimaryKeysForLeftBehindMsgs);
}
});
}
private async Task RetrieveAndDisplayChatMessagesForFriend()
{
Friend friendChattingWith = (Friend)BindingContext;
List <ChatMessage> chatMessages = await App.Database.GetAllChatMessagesForGivenFriend(friendChattingWith);
foreach (ChatMessage chatMessage in chatMessages)
{
//OutputChatMessage(chatMessage);
ChatMessageLabelGenerator.CreateAndDisplayChatMessageLabel(chatMessage, friendChattingWith, chat_messages_area);
}
}
async void Chat_Entry_Completed(object sender, EventArgs e)
{
//PLACE THE MESSAGE IN YOUR DATABASE
ChatMessage chatMessage = await PlaceChatMessageInDatabase(((Entry)sender).Text, "You");
ChatMessageLabelGenerator.CreateAndDisplayChatMessageLabel(chatMessage, (Friend)BindingContext, chat_messages_area);
//SEND THE MESSAGE TO YOUR FRIEND
Friend friendChattingWith = (Friend)BindingContext;
await SendMessage(friendChattingWith.ID, chatMessage);
//clear chat entry box
chat_entry_box.Text = "";
//set scroll position to bottom
await scrollViewChatMsgArea.ScrollToAsync(chat_messages_area, ScrollToPosition.End, false);
}
