/// <summary>
/// Handle UP arrow key to get the previous command executed
/// </summary>
void HandleUpArrow()
{
if (!cmdhistory.PreviousAvailable())
{
return;
}
cmdhistory.Update(buffer.ToString());
string value = cmdhistory.Previous();
if (value != null)
{
// If max window size is reached, start writing on the next line
if (buffer.Length > (Console.WindowWidth - prompt.Length))
{
// Calculate the number of lines based on the buffer length and window size
int line = ((buffer.Length + prompt.Length) / Console.BufferWidth);
if (cursorPtr > (Console.BufferWidth - prompt.Length))
{
ClearConsoleLine();
if (Console.CursorTop - line >= 0)
{
Console.SetCursorPosition(prompt.Length, Console.CursorTop - line);
}
ClearConsoleLine();
}
else
{
if (Console.CursorTop + 1 <= Console.BufferHeight)
{
Console.SetCursorPosition(Console.CursorLeft, Console.CursorTop + 1);
}
ClearConsoleLine();
if (Console.CursorTop - 1 >= 0)
{
Console.SetCursorPosition(0, Console.CursorTop - 1);
}
if (Console.CursorTop - line >= 0)
{
Console.SetCursorPosition(prompt.Length, Console.CursorTop - line);
}
}
}
else
{
ClearConsoleLine();
}
SetText(value);
}
}
/// <summary>
/// Clear screen and display history for commands for Arrow keys.
/// </summary>
internal static void ProcessArrowKeys(byte outbyte)
{
// if '65' then UP arror, else if '66' then down arrow.
if (UpArrowPresent(outbyte) || DownArrowPresent(outbyte))
{
if (UpArrowPresent(outbyte) && historySerial.PreviousAvailable() || DownArrowPresent(outbyte))
{
//clear the previous command
Clear(_userCommandInput.Count);
//Clear the input buffer
_userCommandInput.Clear();
byte[] outputData = null;
if (UpArrowPresent(outbyte))
{
string previous = GetPrevious();
if (!String.IsNullOrEmpty(previous))
{
// get previous command
outputData = Encoding.ASCII.GetBytes(previous);
}
}
else
{
// get next command
string next = GetNext();
if (!String.IsNullOrEmpty(next))
{
outputData = Encoding.ASCII.GetBytes(next);
}
}
// Write to serial if there are any bytes.
if (outputData != null)
{
// write command to output
WriteBytestoSerial(outputData);
}
}
} // end of loop check for Up arrow & Down arrow
}