/// <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>
/// Saves the user created quiz
/// </summary>
/// <param name="sender"> </param>
/// <param name="e"> </param>
private async void ButtonCreateQuiz_Clicked(object sender, EventArgs e)
{
this.Done.IsEnabled = false;
if (string.IsNullOrWhiteSpace(this.EditorQuizName.Text))
{
await this.DisplayAlert("Couldn't Create Quiz", "Please give your quiz a name.", "OK");
}
else if (this.StackLayoutQuestionStack.Children.Count < 2)
{
await this.DisplayAlert("Couldn't Create Quiz", "Please create at least two questions", "OK");
}
else if (this.PickerCategory.SelectedIndex == -1)
{
await this.DisplayAlert("Couldn't Create Quiz", "Please give your quiz a category", "OK");
}
else
{
List <Question> previousQuestions = new List <Question>();
List <Question> NewQuestions = new List <Question>(); // A list of questions the user wants to add to the database
// Loops through each question frame on the screen
foreach (Frame frame in this.StackLayoutQuestionStack.Children)
{
// A list of all the children of the current frame
IList <View> children = ((StackLayout)frame.Content).Children;
Question addThis;
//The answers to the question
string[] answers = { ((Editor)children[2]).Text?.Trim(), //Correct answer
((Editor)children[3]).Text?.Trim(), // Incorect answer
((Editor)children[4]).Text?.Trim(), // Incorect answer
((Editor)children[5]).Text?.Trim() }; // Incorect answer
// Checks if there is a question set
if (string.IsNullOrWhiteSpace(((Editor)children[1]).Text))
{
await this.DisplayAlert("Couldn't Create Quiz", "Every question must have a question set", "OK");
goto exit;
}
if (((ImageButton)children[6]).IsVisible) // if the question needs an image
{
addThis = new Question(
((Editor)children[1]).Text?.Trim(), // The Question
((ImageButton)children[6]).Source.ToString().Substring(6), // adds image using the image source
answers)
{
NeedsPicture = true
};
}
else // if the question does not need an image
{
addThis = new Question(
((Editor)children[1]).Text?.Trim(),
answers);
}
string questionType = ((Button)((StackLayout)children[0]).Children[0]).Text;
// Sets the question type
if (questionType == "Question Type: Multiple choice")
{
int size = 0;
foreach (string answer in answers)
{
if (!string.IsNullOrWhiteSpace(answer))
{
size++;
}
}
if (size < 2 || string.IsNullOrWhiteSpace(answers[0]))
{
await this.DisplayAlert("Couldn't Create Quiz", "Mulitple choice questions must have a correct answer and at least one wrong answer", "OK");
goto exit;
}
addThis.QuestionType = 0;
}
else
{
if (string.IsNullOrWhiteSpace(answers[0]))
{
await this.DisplayAlert("Couldn't Create Quiz", "Text answer questions must have an answer", "OK");
goto exit;
}
if (questionType == "Question Type: Text answer")
{
addThis.QuestionType = 1;
}
else
{
addThis.QuestionType = 2;
}
}
addThis.QuestionId = frame.StyleId; // Set the questionId
NewQuestions.Add(addThis);
}
Quiz database;
// If editing their own quiz
if (this.originalQuizInfo != null && this.originalAuthor == CredentialManager.Username)
{
database = new Quiz(this.originalQuizInfo.DBId);
// Set previousQuestions to the correct previous questions
previousQuestions = database.GetQuestions();
}
else // If new quiz
{
database = new Quiz(
CredentialManager.Username,
this.EditorQuizName.Text.Trim(),
this.PickerCategory.Items[this.PickerCategory.SelectedIndex]);
}
// Add if it doesn't already exist, delete if it doesn't exist anymore, update the ones that need to be updated, and do nothing to the others
if (previousQuestions.Count == 0 || originalAuthor != CredentialManager.Username)
{
// if the user created this for the first time
// Save a new QuizInfo into the quiz database, which also adds this QuizInfo to the device quiz roster
database.AddQuestions(NewQuestions.ToArray());
}
else // edit
{
string currentDirectory = database.DBFolderPath;
QuizInfo updatedQuizInfo = new QuizInfo(database.QuizInfo)
{
QuizName = this.EditorQuizName.Text?.Trim(),
LastModifiedDate = DateTime.Now.ToString(),
Category = this.PickerCategory.Items[this.PickerCategory.SelectedIndex]
};
database.EditQuizInfo(updatedQuizInfo);
if (currentDirectory != updatedQuizInfo.RelativePath)
{
Directory.CreateDirectory(updatedQuizInfo.RelativePath);
Directory.Delete(updatedQuizInfo.RelativePath, true);
Directory.Move(currentDirectory, updatedQuizInfo.RelativePath);
}
// Logic for how to save each question.
for (int i = 0; i <= previousQuestions.Count() - 1; i++)
{
bool DBIdSame = true;
// test each old question with each new question
foreach (Question newQuestion in NewQuestions)
{
if (previousQuestions[i].QuestionId == newQuestion.QuestionId)
{
DBIdSame = true;
// the same question, but changed, so update
database.EditQuestion(newQuestion);
NewQuestions.Remove(newQuestion);
break;
}
else
{
DBIdSame = false;
}
}
if (!DBIdSame) // if the question doesn't exist in the new list. delete it
{
database.DeleteQuestions(previousQuestions[i]);
}
}
// Add all the questions that aren't eddited
database.AddQuestions(NewQuestions.ToArray());
}
File.Create(database.DBFolderPath + ".nomedia");
// Returns user to front page of QuizEditor and refreshed database
await this.Navigation.PopAsync(true);
}
exit :;
this.Done.IsEnabled = true;
}