/// <summary>
/// handles left arrow key user key press.
/// </summary>
private static void handleInputLeftArrowKey()
{
// if not at beginning of line, move cursor one character backwards
if (!ConsoleIOUtils.IsCursorPointingToBeginningOfLine())
{
ConsoleIOUtils.MoveCursorHorizontal(-1);
}
}
/// <summary>
/// handles backspace key press. removes character to the left of cursor from console.
/// </summary>
private static void handleInputBackspaceKey()
{
if (ConsoleIOUtils.CursorLeft > 0) // not at beginning of line
{
// move cursor one character backwards
ConsoleIOUtils.MoveCursorHorizontal(-1);
// remove current character from line buffer
removeCharacterFromLineBufferAtCurrentPosition();
// rewrite console input line without removed character
rewriteInputLineToCosole();
}
}
/// <summary>
/// handles key press encapsulated in <paramref name="consoleKeyInfo"/>,
/// and dislays its textual representation to console, if one exists.
/// </summary>
/// <param name="consoleKeyInfo"></param>
internal static void HandleInputKey(ConsoleKeyInfo consoleKeyInfo)
{
if (consoleKeyInfo.Key == ConsoleKey.Enter) // key represents enter
{
handleInputEnterKey();
}
else if (consoleKeyInfo.Key == ConsoleKey.Backspace) // key represents backspace
{
handleInputBackspaceKey();
}
else if (consoleKeyInfo.Key == ConsoleKey.LeftArrow) // key represents left-arrow
{
handleInputLeftArrowKey();
}
else if (consoleKeyInfo.Key == ConsoleKey.RightArrow) // key represents right-arrow
{
handleInputRightArrowKey();
}
// key has textual representation
else if (
ConsoleIOUtils.IsTextualKey(consoleKeyInfo) &&
ConsoleIOUtils.CursorLeft < ConsoleIOUtils.WindowWidth - 1)
{
// insert key char representation to line buffer
insertToLineBufferAtCurrentPosition(consoleKeyInfo.KeyChar.ToString());
if (ConsoleIOUtils.CursorLeft == inputLineBuffer.Length - 1) // append to end of line
{
Console.Write(consoleKeyInfo.KeyChar.ToString());
}
else // insert within line
{
// rewrite current line so that insert within line buffer is visible
rewriteInputLineToCosole();
// move 1 character to the right
ConsoleIOUtils.MoveCursorHorizontal(1);
}
}
}