/// <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>
/// When a user wants to subscribe to a quiz
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
async private void ImageButtonSubscribe_Clicked(object sender, EventArgs e)
{
if (CredentialManager.IsLoggedIn)
{
ImageButton button = (sender as ImageButton);
string dbId = button.StyleId;
ActivityIndicator indicatorSyncing = (button.Parent as StackLayout).Children[(int)SubscribeUtils.SubscribeType.Syncing] as ActivityIndicator;
button.IsVisible = false;
indicatorSyncing.IsVisible = true;
indicatorSyncing.IsRunning = true;
OperationReturnMessage returnMessage = await SubscribeUtils.SubscribeToQuizAsync(dbId, this.quizzesFeatured);
if (returnMessage == OperationReturnMessage.True)
{
(button.Parent as StackLayout).Children[2].IsVisible = true; // add in unsubscribe button
}
else if (returnMessage == OperationReturnMessage.FalseInvalidCredentials)
{
button.IsVisible = true;
await this.DisplayAlert("Invalid Credentials", "Your current login credentials are invalid. Please try logging in again.", "OK");
}
else
{
button.IsVisible = true;
await this.DisplayAlert("Subscribe Failed", "The subscription request could not be completed. Please try again.", "OK");
}
indicatorSyncing.IsVisible = false; // remove activity indicator
indicatorSyncing.IsRunning = false;
}
else
{
await this.DisplayAlert("Hold on!", "Before you can subscribe to any quizzes, you have to login.", "Ok");
}
}
/// <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");
}
}