// When the page is constructed, the client receives all pre-existing messages
// from the database. These messages are loaded into a temporary list which are
// then read into the ObservableCollection. This intermediary step was made
// necessary due to the fact that ObservableCollections cannot be assigned to Lists.
private async void LoadMessages()
{
_loadedMessages = await ChatDBService.LoadMessages();
foreach (var message in _loadedMessages)
{
this.LoadedMessages.Add(message);
}
}
// The DB services are initialized with the selected group's information, tying them to the correct locations
// in Cosmos DB.
private async void InitializeServices()
{
chat = new ChatDBService();
flash = new FlashDBService();
// Initializes the ChangeFeedProcessor.
await chat.RunChangeFeedHostAsync();
await flash.RunChangeFeedHostAsync();
}
// When the user finishes the quiz, an automated message is generated detailing their efforts.
private async void FinishQuiz()
{
DecideExclamation();
Message message = new Message()
{
ObjType = "Msg",
SenderName = "AnnouncerBot",
SenderAvatar = new Uri("http://icons.iconarchive.com/icons/danleech/simple/1024/android-icon.png"),
Text = MainPageViewModel.CurrentGoogleUsername
+ " just got " + _correctSubmissions + " out of " + Length
+ " flashcards right playing " + Creator + "'s " + QuizName
+ " deck! " + _exclamation,
Category = "Announcement",
Timestamp = DateTime.Now.Ticks.ToString()
};
await ChatDBService.UploadMessage(message);
await _navigationService.GoBackAsync();
}
public async void ComposeMessage()
{
// Disallows the user from publishing empty strings.
if (Input == null)
{
return;
}
Message message = new Message()
{
ObjType = "Msg",
SenderAvatar = MainPageViewModel.CurrentGoogleAvatar,
SenderName = MainPageViewModel.CurrentGoogleUsername,
Text = Input,
Category = PickerCategory,
Timestamp = DateTime.Now.Ticks.ToString()
};
Input = "";
await ChatDBService.UploadMessage(message);
}