/// <summary>
/// Handle event when user clicks delete quiz button.
/// </summary>
/// <param name="e"></param>
private async void ButtonDelete_Clicked(string deleteType, string DBId)
{
if (CredentialManager.IsLoggedIn)
{
bool unsubscribe = deleteType == "Unsubscribe";
string question;
string message;
if (unsubscribe)
{
question = "Are you sure you want to unsubscribe?";
message = "This will remove the copy from your device";
}
else
{
question = "Are you sure you want to delete this quiz?";
message = "This will delete the copy on your device and in the cloud. This is not reversable.";
}
bool answer = await this.DisplayAlert(question, message, "Yes", "No");
if (answer)
{
// Acquire QuizInfo from roster
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(DBId); // Author
string path = rosterInfo.RelativePath;
// tell the roster that the quiz is deleted
QuizInfo rosterInfoUpdated = new QuizInfo(rosterInfo)
{
IsDeletedLocally = true,
LastModifiedDate = DateTime.Now.ToString()
};
QuizRosterDatabase.EditQuizInfo(rosterInfoUpdated);
// If connected, tell server to delete this quiz If not, it will tell server to delete next time it is connected in QuizRosterDatabase.UpdateLocalDatabase()
if (CrossConnectivity.Current.IsConnected)
{
OperationReturnMessage returnMessage;
if (unsubscribe)
{
returnMessage = await SubscribeUtils.UnsubscribeFromQuizAsync(DBId);
}
else
{
returnMessage = await ServerOperations.DeleteQuiz(DBId);
}
if (System.IO.Directory.Exists(path))
{
Directory.Delete(path, true);
}
this.Setup();
}
}
}
else
{
await this.DisplayAlert("Hold on!", "You must be create an account or log in before you can unsubscribe", "OK");
}
}
/// <summary>
/// Unsubscribe from a quiz
/// </summary>
/// <param name="dbId">ID to unsub from</param>
/// <returns>If the unsub was successful</returns>
public static async Task <OperationReturnMessage> UnsubscribeFromQuizAsync(string dbId)
{
QuizInfo info = QuizRosterDatabase.GetQuizInfo(dbId);
if (info.SyncStatus != (int)SyncStatusEnum.NotDownloadedAndNeedDownload)
{
string location = App.UserPath + "/" + info.Category + "/" + info.QuizName + "`" + info.AuthorName;
if (Directory.Exists(location))
{
Directory.Delete(location, true);
}
}
OperationReturnMessage returnMessage = await Task.Run(async() => await ServerOperations.UnsubscribeToQuizAsync(dbId));
if (returnMessage == OperationReturnMessage.True)
{
QuizRosterDatabase.DeleteQuizInfo(dbId);
return(returnMessage);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
CredentialManager.IsLoggedIn = false;
return(returnMessage);
}
else
{
return(returnMessage);
}
}
/// <summary>
/// Handle when user clicks edit button
/// </summary>
private async void ButtonEdit_Clicked(string DBId)
{
QuizInfo info = QuizRosterDatabase.GetQuizInfo(DBId);
if (!CredentialManager.IsLoggedIn)
{
await this.DisplayAlert("Hold on!", "Before you can edit any quizzes, you have to login.", "Ok");
}
else if (info.SyncStatus == (int)SyncStatusEnum.NotDownloadedAndNeedDownload)
{
await this.DisplayAlert("Hold on!", "This quiz isn't on your device, download it before you try to edit it", "Ok");
}
else
{
CreateNewQuizPage quizPage = new CreateNewQuizPage(info); //Create the quizPage
quizPage.SetQuizName(info.QuizName);
Quiz quizDB = new Quiz(info.DBId);
foreach (Question question in quizDB.GetQuestions())
{
quizPage.AddNewQuestion(question);
}
await this.Navigation.PushAsync(quizPage);
}
}
/// <summary>
/// Sets up the page with quizzes the user has subscribed to from the category of the page
/// </summary>
public void Setup()
{
if (!this.IsLoading)
{
this.IsLoading = true;
this.StackLayoutButtonStack.Children.Clear();
List <QuizInfo> quizzes = QuizRosterDatabase.GetRoster(this.category);
if (quizzes.Count == 0)
{
Device.BeginInvokeOnMainThread(() =>
{
StackLayout stack = new StackLayout();
stack.Children.Add(new Label
{
Text = "You don't have any quizzes in this category yet!",
HorizontalTextAlignment = TextAlignment.Center,
FontSize = 38
});
if (CredentialManager.IsLoggedIn)
{
stack.Children.Add(new Button
{
Text = "Make a quiz now",
CornerRadius = 25,
BackgroundColor = Color.Accent,
TextColor = Color.White,
FontSize = 26
});
(stack.Children[1] as Button).Clicked += (object sender, EventArgs e) => this.Navigation.PushAsync(new CreateNewQuizPage());
stack.Children.Add(new Button
{
Text = "Search for quizzes",
CornerRadius = 25,
BackgroundColor = Color.Accent,
TextColor = Color.White,
FontSize = 26
});
(stack.Children[2] as Button).Clicked += (object sender, EventArgs e) => this.Navigation.PushAsync(new SearchPage());
}
Frame frame = new Frame()
{
CornerRadius = 10,
HorizontalOptions = LayoutOptions.CenterAndExpand,
Content = stack
};
this.StackLayoutButtonStack.Children.Add(frame);
});
}
foreach (QuizInfo quiz in quizzes)
{
Frame frame = GenerateFrame(quiz);
this.StackLayoutButtonStack.Children.Add(frame);
}
this.IsLoading = false;
}
}
/// <summary>
/// Send a quiz to the server with the current user credentials.
/// </summary>
/// <param name="relativeQuizPath">The path to the quiz on the current device.</param>
/// <returns>A bool wrapped in a task representing whether the quiz successfully sent or not.</returns>
public async static Task <bool> SendQuiz(string relativeQuizPath)
{
try
{
string realmFilePath = Directory.GetFiles(App.UserPath + relativeQuizPath, "*.realm").First();
Realm realm = Realm.GetInstance(App.realmConfiguration(realmFilePath));
QuizInfo info = realm.All <QuizInfo>().First();
if (await SendRealmFile(realmFilePath) != OperationReturnMessage.True)
{
throw new Exception();
}
string[] imageFilePaths = Directory.GetFiles(App.UserPath + relativeQuizPath, "*.jpg");
for (int i = 0; i < imageFilePaths.Length; i++)
{
//[0] = path, [1] = fileName, [2] = dBId
string fileName = imageFilePaths[i].Split('/').Last().Split('.').First();
string dbID = info.DBId;
OperationReturnMessage message = await SendImageFile(imageFilePaths[i], fileName, dbID);
if (message == OperationReturnMessage.False)
{
throw new Exception();
}
}
// When finished, confirm with server that quiz send has completed
OperationReturnMessage finalizationMessage = (OperationReturnMessage)SendStringData(
$"{info.DBId}`{info.LastModifiedDate}`{imageFilePaths.Length + 1}`" +
$"{CredentialManager.Username}`{await SecureStorage.GetAsync("password")}`-",
ServerRequestTypes.FinalizeQuizSend);
if (finalizationMessage == OperationReturnMessage.True)
{
QuizInfo infoCopy = new QuizInfo(info)
{
SyncStatus = (int)SyncStatusEnum.Synced
};
QuizRosterDatabase.EditQuizInfo(infoCopy);
return(true);
}
else
{
throw new Exception();
}
}
catch (Exception ex)
{
string test = ex.ToString();
// Alert server that quiz send failed Delete records
return(false);
}
}
/// <summary>
/// When a user wants to unsubscribe from a quiz
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ImageButtonUnsubscribe_Clicked(object sender, EventArgs e)
{
if (CredentialManager.IsLoggedIn)
{
ImageButton button = (sender as ImageButton);
string dbId = button.StyleId;
bool answer = await this.DisplayAlert("Are you sure you want to unsubscribe?", "You will no longer get updates of this quiz", "Yes", "No");
if (answer)
{
ActivityIndicator indicatorSyncing = (button.Parent as StackLayout).Children[(int)SubscribeUtils.SubscribeType.Syncing] as ActivityIndicator;
button.IsVisible = false;
indicatorSyncing.IsVisible = true;
indicatorSyncing.IsRunning = true;
// get rosterInfo
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(dbId);
// tell the roster that the quiz is deleted
QuizInfo rosterInfoUpdated = new QuizInfo(rosterInfo)
{
IsDeletedLocally = true,
LastModifiedDate = DateTime.Now.ToString()
};
QuizRosterDatabase.EditQuizInfo(rosterInfoUpdated);
OperationReturnMessage returnMessage = await SubscribeUtils.UnsubscribeFromQuizAsync(dbId);
if (returnMessage == OperationReturnMessage.True)
{
(button.Parent as StackLayout).Children[(int)SubscribeUtils.SubscribeType.Subscribe].IsVisible = true; // add in subscribe button
QuizRosterDatabase.DeleteQuizInfo(dbId);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
button.IsVisible = true;
await this.DisplayAlert("Invalid Credentials", "Your current login credentials are invalid. Please log in and try again.", "OK");
}
else
{
button.IsVisible = true;
await this.DisplayAlert("Unsubscribe Failed", "The unsubscription request could not be completed. Please try again.", "OK");
}
indicatorSyncing.IsVisible = false;
indicatorSyncing.IsRunning = false;
}
}
else
{
await this.DisplayAlert("Hold on!", "Before you can subscribe to any quizzes, you have to login.", "Ok");
}
}
/// <summary>
/// Deletes the quiz from the roster
/// </summary>
private async Task ButtonDelete_Clicked(string DBId)
{
bool answer = await this.DisplayAlert("Are you sure you want to delete this quiz?", "This will delete the copy on your device and in the cloud. This is not reversable.", "Yes", "No");
if (answer)
{
// Acquire QuizInfo from roster
QuizInfo rosterInfo = QuizRosterDatabase.GetQuizInfo(DBId);
string path = rosterInfo.RelativePath;
if (rosterInfo != null)
{
string dbId = rosterInfo.DBId;
// tell the roster that the quiz is deleted
QuizInfo rosterInfoUpdated = new QuizInfo(rosterInfo)
{
IsDeletedLocally = true,
LastModifiedDate = DateTime.Now.ToString()
};
QuizRosterDatabase.EditQuizInfo(rosterInfoUpdated);
// If connected, tell server to delete this quiz If not, it will tell server to delete next time it is connected in QuizRosterDatabase.UpdateLocalDatabase()
OperationReturnMessage returnMessage = await ServerOperations.DeleteQuiz(dbId);
if (returnMessage == OperationReturnMessage.True)
{
QuizRosterDatabase.DeleteQuizInfo(dbId);
}
if (System.IO.Directory.Exists(path))
{
Directory.Delete(path, true);
}
this.QuizNumber.Text =
"You have published a total of " +
await Task.Run(() => ServerOperations.GetNumberOfQuizzesByAuthorName(CredentialManager.Username)) +
" quizzes!";
}
else
{
await DisplayAlert("Could not delete quiz", "This quiz could not be deleted at this time. Please try again later", "OK");
}
// Setup Page again after deletion
await this.UpdateProfilePageAsync();
}
}
/// <summary>
/// Saves updates to a quizInfo
/// </summary>
/// <param name="editedQuizInfo">the new version of the quizinfo to save</param>
public void EditQuizInfo(QuizInfo editedQuizInfo)
{
Realm realmDB = Realm.GetInstance(App.realmConfiguration(this.dbPath));
realmDB.Write(() =>
{
realmDB.Add(editedQuizInfo, update: true);
});
QuizInfo rosterCopy = new QuizInfo(editedQuizInfo)
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // Default to 1, meaning "needs upload" in roster
};
QuizRosterDatabase.EditQuizInfo(rosterCopy);
}
/// <summary>
/// Show an activity indicator and refresh the page in the background.
/// </summary>
/// <returns></returns>
public async Task RefreshPageAsync()
{
await this.StackLayoutButtonStack.FadeTo(0, 1);
this.ActivityIndicator.IsVisible = true;
this.ActivityIndicator.IsRunning = true;
this.isSetup = false;
await Task.Run(() => QuizRosterDatabase.UpdateLocalDatabaseAsync());
this.CheckSetup();
this.ActivityIndicator.IsVisible = false;
this.ActivityIndicator.IsRunning = false;
await this.StackLayoutButtonStack.FadeTo(1, 1);
}
/// <summary>
/// Called when the user tries to download a quiz
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void SyncDownload_Clicked(object sender, EventArgs e)
{
// this.serverConnected = true;
ImageButton button = sender as ImageButton;
string dbId = button.ClassId;
QuizInfo quizInfo = QuizRosterDatabase.GetQuizInfo(dbId);
// DOES THIS WORK?
while (quizInfo == null && Plugin.Connectivity.CrossConnectivity.Current.IsConnected)
{
await QuizRosterDatabase.UpdateLocalDatabaseAsync();
quizInfo = QuizRosterDatabase.GetQuizInfo(dbId);
}
string authorName = quizInfo.AuthorName;
string quizName = quizInfo.QuizName;
string category = quizInfo.Category;
ActivityIndicator indicatorSyncing = (button.Parent as StackLayout).Children[(int)UISyncStatus.Syncing] as ActivityIndicator;
string quizPath = button.ClassId;
button.IsVisible = false;
indicatorSyncing.IsVisible = true;
indicatorSyncing.IsRunning = true;
if (await Task.Run(() => ServerOperations.GetQuiz(dbId, category)))
{
ImageButton buttonSyncNoChange = (button.Parent as StackLayout).Children[(int)UISyncStatus.NoChange] as ImageButton;
indicatorSyncing.IsVisible = false;
buttonSyncNoChange.IsVisible = true;
(((button.Parent as StackLayout).Parent as StackLayout).Parent as Frame).StyleId = "Local";
}
else // If it failed to download
{
indicatorSyncing.IsVisible = false;
button.IsVisible = true;
await this.DisplayAlert("Quiz Download Failed",
"This quiz could not be downloaded from the server. Please try again.",
"OK");
}
indicatorSyncing.IsRunning = false;
await this.UpdateProfileContentAsync(
this.SelectedCategory);
}
/// <summary>
/// Subscribes to a quiz given the ID
/// </summary>
/// <param name="dbId">the ID of the quiz to sub to</param>
/// <param name="quizzesSearched">the quizzes currently displayed (used to get info about the quiz from the dbid)</param>
/// <returns>If the subscription was successful</returns>
public static async Task <OperationReturnMessage> SubscribeToQuizAsync(string dbId, List <QuizInfo> quizzesSearched)
{
if (QuizRosterDatabase.GetQuizInfo(dbId) == null) // make sure it isn't in yet
{
OperationReturnMessage returnMessage = await Task.Run(async() => await ServerOperations.SubscribeToQuiz(dbId));
if (returnMessage == OperationReturnMessage.True)
{
QuizInfo quiz = quizzesSearched.Where(quizInfo => quizInfo.DBId == dbId).First();
string lastModifiedDate = await Task.Run(() => ServerOperations.GetLastModifiedDate(dbId));
QuizInfo newInfo = new QuizInfo
{
DBId = quiz.DBId,
AuthorName = quiz.AuthorName,
QuizName = quiz.QuizName,
Category = quiz.Category,
LastModifiedDate = lastModifiedDate,
SyncStatus = (int)SyncStatusEnum.NotDownloadedAndNeedDownload // 4 to represent not present in local directory and need download
};
QuizRosterDatabase.SaveQuizInfo(newInfo);
return(returnMessage);
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
CredentialManager.IsLoggedIn = false;
return(returnMessage);
}
else
{
return(returnMessage);
}
}
else
{
return(OperationReturnMessage.False);
}
}
/// <summary>
/// Sets up the quizzes owned by this user as cards
/// </summary>
private async Task SetupQuizzes(string category)
{
await QuizRosterDatabase.UpdateLocalDatabaseAsync();
// A single LINQ statement to get all quizzes by the current
// user that is logged in, and of the specified category,
// taking the top 20 of the current chunk ordered by
// the subscriber count of the quizzes
List <QuizInfo> rosterCopy = QuizRosterDatabase.GetRoster();
List <QuizInfo> quizzes =
rosterCopy.
Where(
quizInfo =>
(quizInfo.AuthorName == CredentialManager.Username
&&
(quizInfo.Category == category || category == "All"))).
OrderBy(quizInfo => quizInfo.SubscriberCount).
Take(20 * this.currentChunk).ToList();
this.AddQuizzes(quizzes, false);
}
/// <summary>
/// Create a new quizinfo and adds it to the Quiz DB.
/// A copy is stored in the device quiz roster.
/// </summary>
/// <param name="authorName">Author</param>
/// <param name="quizName">Quiz name</param>
/// <param name="category">Category</param>
public void NewQuizInfo(string authorName, string quizName, string category)
{
QuizInfo newQuizInfo = new QuizInfo(authorName, quizName, category)
{
// Sync status is irrelevant in a Quiz Database's copy of the QuizInfo
SyncStatus = -1
};
this.QuizInfo = newQuizInfo;
Realm realmDB = Realm.GetInstance(App.realmConfiguration(this.dbPath));
realmDB.Write(() =>
{
realmDB.Add(newQuizInfo);
});
QuizInfo rosterCopy = new QuizInfo(newQuizInfo)
{
SyncStatus = (int)SyncStatusEnum.NeedUpload // Default to 1, meaning "needs upload" in roster
};
QuizRosterDatabase.SaveQuizInfo(rosterCopy);
}
/// <summary>
/// Handle when user presses "three dot" icon on the quiz tab
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ImageButtonMenu_Clicked(object sender, EventArgs e)
{
string DBId = ((ImageButton)sender).ClassId;
QuizInfo quizInfo = QuizRosterDatabase.GetQuizInfo(DBId);
string quizName = quizInfo.QuizName;
string author = quizInfo.AuthorName;
string deleteText = "Delete";
if (author != CredentialManager.Username)
{
deleteText = "Unsubscribe";
}
string action = await this.DisplayActionSheet(quizName, "Back", null, deleteText, "Edit");
if (action == deleteText)
{
this.ButtonDelete_Clicked(((ImageButton)sender).StyleId, ((ImageButton)sender).ClassId);
}
else if (action == "Edit")
{
this.ButtonEdit_Clicked(DBId);
}
}
/// <summary>
/// Update local data through synchronzing data with server.
/// Runs on a timed background task and repeats a synchronization every two minutes.
/// </summary>
/// <returns></returns>
public static async Task RunServerChecksAsync()
{
await CredentialManager.CheckLoginStatusAsync();
await Task.Run(async() => await QuizRosterDatabase.UpdateLocalDatabaseAsync());
var minutes = TimeSpan.FromMinutes(2);
Device.StartTimer(minutes, () =>
{
Task task = Task.Run(async() =>
{
if (CredentialManager.IsLoggedIn)
{
await CredentialManager.CheckLoginStatusAsync();
}
await QuizRosterDatabase.UpdateLocalDatabaseAsync();
BugReportHandler.SubmitSavedReports();
});
// Return true to continue the timer
return(true);
});
}
/// <summary>
/// Download a quiz from the server.
/// </summary>
/// <param name="dBId">The DBId of the quiz to download</param>
/// <param name="category">The category the quiz belongs in.</param>
/// <returns></returns>
public static bool GetQuiz(string dBId, string category)
{
// TO DO: CHECK IF quizName or category changed and save accordingly
string tempPath = App.UserPath + "/" + "temp" + "/" + dBId + "/";
string tempFilePath = tempPath + "/" + realmFileExtension;
// Store the realm file into a temporary directory in order the retrieve information from it
// (Information regarding the images in order to retrieve them from the server)
Directory.CreateDirectory(tempPath);
byte[] realmFile = (byte[])SendStringData($"{dBId}/-", ServerRequestTypes.GetRealmFile);
if (realmFile.Length > 0)
{
File.WriteAllBytes(tempFilePath, realmFile);
}
else
{
return(false);
}
// Retrieve info regarding the images from the realm file from its temporary location
Realm realmDB = Realm.GetInstance(App.realmConfiguration(tempFilePath));
IQueryable <Question> questionsWithPictures = realmDB.All <Question>().Where(question => question.NeedsPicture);
foreach (Question question in questionsWithPictures)
{
byte[] jpegFile = (byte[])SendStringData($"{question.QuestionId}/{dBId}/-", ServerRequestTypes.GetJPEGImage);
string jpegFilePath = tempPath + "/" + question.QuestionId + jpegFileExtension;
if (jpegFile.Length > 0)
{
File.WriteAllBytes(jpegFilePath, jpegFile);
}
else
{
return(false);
}
}
QuizInfo info = realmDB.All <QuizInfo>().First();
string newQuizName = info.QuizName;
string newCategory = info.Category;
string newLastModfiedDate = info.LastModifiedDate;
string quizPath = info.RelativePath;
string realmFilePath = quizPath + "/" + info.DBId + realmFileExtension;
Directory.CreateDirectory(quizPath);
string[] imageFilePaths = Directory.GetFiles(tempPath, "*.jpg");
string[] realmFilePaths = Directory.GetFiles(tempPath, "*.realm");
foreach (string path in realmFilePaths)
{
File.Copy(path, quizPath + "/" + info.DBId + realmFileExtension, true);
}
foreach (string path in imageFilePaths)
{
string imageName = path.Split('/').Last();
File.Copy(path, quizPath + "/" + imageName, true);
}
if (category != newCategory)
{
DeleteDirectory(info.RelativePath, true);
}
DeleteDirectory(tempPath, true);
QuizInfo infoCopy = new QuizInfo(QuizRosterDatabase.GetQuizInfo(dBId))
{
SyncStatus = (int)SyncStatusEnum.Synced,
QuizName = newQuizName,
Category = newCategory,
LastModifiedDate = newLastModfiedDate
};
QuizRosterDatabase.EditQuizInfo(infoCopy);
return(true);
}
/// <summary>
/// Select database file for the current game/topic, Load the questions from file
/// </summary>
public Quiz(string DBId)
{
this.QuizInfo = QuizRosterDatabase.GetQuizInfo(DBId);
this.LoadQuestions();
}
/// <summary>
/// Adds a quiz to the search stack given a QuizInfo
/// </summary>
/// <param name="quizzes"></param>
private void AddQuizzes(List <QuizInfo> quizzes)
{
List <QuizInfo> currentlySubscribed = QuizRosterDatabase.GetRoster();
foreach (QuizInfo quiz in quizzes)
{// Only add quiz if the category is what user picked (we are asking the server for more then we need so this could be changed)
if (this.category == "All" || quiz.Category == this.category)
{
Frame quizFrame = new Frame
{
VerticalOptions = LayoutOptions.Start,
HorizontalOptions = LayoutOptions.FillAndExpand,
CornerRadius = 10
};
StackLayout frameStack = new StackLayout
{
FlowDirection = FlowDirection.LeftToRight,
Orientation = StackOrientation.Vertical
};
StackLayout topStack = new StackLayout
{
FlowDirection = FlowDirection.LeftToRight,
Orientation = StackOrientation.Horizontal
};
Label quizName = new Label // 0
{
Text = quiz.QuizName,
FontAttributes = FontAttributes.Bold,
FontSize = Device.GetNamedSize(NamedSize.Large, typeof(Label)),
HorizontalOptions = LayoutOptions.StartAndExpand
};
topStack.Children.Add(quizName);
ImageButton ImageButtonSubscribe = new ImageButton // 1
{
IsVisible = false,
Source = "ic_playlist_add_black_48dp.png",
StyleId = quiz.DBId,
HeightRequest = 30,
BackgroundColor = Color.White,
HorizontalOptions = LayoutOptions.End
};
ImageButtonSubscribe.Clicked += this.ImageButtonSubscribe_Clicked;
topStack.Children.Add(ImageButtonSubscribe);
ImageButton ImageButtonUnsubscribe = new ImageButton // 2
{
IsVisible = false,
Source = "ic_playlist_add_check_black_48dp.png",
StyleId = quiz.DBId,
HeightRequest = 30,
BackgroundColor = Color.White,
HorizontalOptions = LayoutOptions.End
};
ImageButtonUnsubscribe.Clicked += this.ImageButtonUnsubscribe_Clicked;
topStack.Children.Add(ImageButtonUnsubscribe);
ActivityIndicator Syncing = new ActivityIndicator // 3
{
IsVisible = false,
Color = Color.Accent,
HeightRequest = 25,
WidthRequest = 25,
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.End,
};
topStack.Children.Add(Syncing);
if (quiz.AuthorName != CredentialManager.Username)
{
// If already subscribed
if (!(currentlySubscribed.Where(quizInfo => quizInfo.DBId == quiz.DBId && !quizInfo.IsDeletedLocally).Count() > 0))
{
ImageButtonSubscribe.IsVisible = true;
}
else
{
ImageButtonUnsubscribe.IsVisible = true;
}
}
frameStack.Children.Add(topStack);
Label quizAuthor = new Label
{
Text = "Created by: " + quiz.AuthorName,
};
frameStack.Children.Add(quizAuthor);
Label quizCategory = new Label
{
Text = "Category: " + quiz.Category,
};
frameStack.Children.Add(quizCategory);
quizFrame.Content = frameStack;
this.quizzesSearched.Add(quiz);
Device.BeginInvokeOnMainThread(() =>
this.SearchedStack.Children.Add(quizFrame));
}
}
}
/// <summary>
/// Loads the profile content if the user is logged in.
/// </summary>
/// <returns> </returns>
private async Task UpdateProfileContentAsync(string category)
{
if (!this.IsContentLoading)
{
this.IsContentLoading = true;
this.QuizNumber.IsVisible = true;
this.PickerCategory.IsVisible = false;
this.PickerCategory.IsEnabled = false;
this.StackLayoutQuizStack.Children.Clear();
this.StackLayoutQuizStack.IsEnabled = false;
this.ActivityIndicator.IsVisible = true;
this.ActivityIndicator.IsRunning = true;
await Task.Run(async() =>
{
await this.SetupQuizzes(category);
int createdCountFromServer = ServerOperations.GetNumberOfQuizzesByAuthorName(CredentialManager.Username);
string frameMessage = "";
if (createdCountFromServer >= 0) // Returns -1 if can't connect to server
{
if (createdCountFromServer == 0 &&
!QuizRosterDatabase.GetRoster()
.Any(quizInfo => quizInfo.AuthorName == CredentialManager.Username))
{
frameMessage = "You haven't made any quizzes yet!";
Device.BeginInvokeOnMainThread(() =>
{
this.PickerCategory.IsVisible = false;
this.QuizNumber.IsVisible = false;
});
}
else
{
Device.BeginInvokeOnMainThread(() =>
{
this.QuizNumber.Text = "You have published a total of " + createdCountFromServer + " quizzes!";
this.PickerCategory.IsVisible = true;
this.PickerCategory.IsEnabled = true;
});
}
}
else
{
frameMessage = "Could not connect to BizQuiz servers. Please try again later.";
Device.BeginInvokeOnMainThread(() =>
{
this.PickerCategory.IsVisible = true;
this.PickerCategory.IsEnabled = true;
});
}
if (frameMessage != "")
{
Frame frame = new Frame()
{
CornerRadius = 10,
HorizontalOptions = LayoutOptions.CenterAndExpand,
Content = new Label
{
Text = frameMessage,
HorizontalTextAlignment = TextAlignment.Center,
FontSize = 38
}
};
Device.BeginInvokeOnMainThread(() =>
this.StackLayoutQuizStack.Children.Add(frame));
}
});
if (this.ToolbarItems.Count <= 0)
{
ToolbarItem accountSettingsButton = new ToolbarItem();
accountSettingsButton.Clicked += this.ToolbarItemAccountSettings_Clicked;
accountSettingsButton.Icon = ImageSource.FromFile("ic_settings_white_48dp.png") as FileImageSource;
this.ToolbarItems.Add(accountSettingsButton);
}
this.IsOnLoginPage = false;
this.ActivityIndicator.IsRunning = false;
this.ActivityIndicator.IsVisible = false;
this.StackLayoutQuizStack.IsEnabled = true;
this.IsContentLoading = false;
}
}