// prints the question
public virtual IQuestion Ask()
{
IUserTerminal terminal = this.Terminal;
// 1. ask the question, simply buy just printing it
terminal.ForegroundColor = this.Questionnaire.Settings.QuestionIconColor;
terminal.Printer.Write($"{this.Questionnaire.Settings.QuestionIcon} ");
terminal.ForegroundColor = this.Questionnaire.Settings.QuestionColor;
terminal.Printer.Write(this.Text);
// prints any hints available
if (this.Hint.Trim().Length > 0)
{
terminal.ForegroundColor = this.Questionnaire.Settings.HintColor;
terminal.Printer.Write($"( {this.Hint} )");
}
// a single space to seperate q/a
terminal.Printer.Write(" ");
// 2. wait for the user to give answer to the question
this.TakeAnswer();
terminal.ResetColor();
return(this);
}
protected override IQuestion TakeAnswer( )
{
IUserTerminal terminal = this.Terminal;
// this should be before ReadLine,
// because ReadLine will eliminate the current Lef position and reset it to 0
int cursorLeft = Console.CursorLeft;
// always set the color of terminal to AnswerColor
terminal.ForegroundColor = this.Questionnaire.Settings.AnswerColor;
this.Answer = terminal.Scanner.ReadLine( );
// this should be after ReadLine because
// before the user enters the input he/she might resize the console,
// hence the top will change
int cursorTop = Console.CursorTop;
if (this.Answer?.Trim().Length == 0 && this.DefaultAnswer != null)
{
Console.SetCursorPosition(left: cursorLeft, top: cursorTop - 1);
terminal.Printer.Write(this.DefaultAnswer);
this.Answer = this.DefaultAnswer;
}
bool result = this.Validate( );
this.State = result ? QuestionStates.Valid : QuestionStates.Invalid;
if (result)
{
this.ClearLine(cursorTop);
}
else
{
this.PrintValidationErrors( );
// -1 beacause of readline
var line = cursorTop - 1;
this.ClearAnswer(line: line);
Console.SetCursorPosition(left: cursorLeft, top: line);
return(this.TakeAnswer( ));
}
terminal.ResetColor( );
return(this);
}
protected override IQuestion TakeAnswer()
{
IUserTerminal terminal = this.Terminal;
int column = Console.CursorLeft;
int line = Console.CursorTop;
int activeOption = -1;
if (this.State == QuestionStates.Initilaized)
{
this.DrawOptions();
}
Console.SetCursorPosition(column, line);
activeOption = this.HandleInput(column, line, activeOption);
this.State = this.Validate() ? QuestionStates.Valid : QuestionStates.Invalid;
if (this.State == QuestionStates.Invalid)
{
Console.SetCursorPosition(0, line + this.VisibleOptions + 1);
this.PrintValidationErrors();
Console.SetCursorPosition(column, line);
this.TakeAnswer();
}
else
{
this.ClearLines(line + 1, line + this.VisibleOptions + 1);
}
// resets the cursor to the next line,
// because of the options the cursor might be in wrong position for the next question
Console.SetCursorPosition(0, line + 1);
terminal.ResetColor();
return(this);
}