Method keyPressed

app/src/processing/app/SerialMonitor.java:75–99

(KeyEvent e)

    // Add key listener to UP, DOWN, ESC keys for command history traversal.
    textField.addKeyListener(new KeyAdapter() {
      @Override
      public void keyPressed(KeyEvent e) {
        switch (e.getKeyCode()) {

          // Select previous command.
          case KeyEvent.VK_UP:
            if (commandHistory.hasPreviousCommand()) {
              textField.setText(
                  commandHistory.getPreviousCommand(textField.getText()));
            }
            break;

          // Select next command.
          case KeyEvent.VK_DOWN:
            if (commandHistory.hasNextCommand()) {
              textField.setText(commandHistory.getNextCommand());
            }
            break;

          // Reset history location, restoring the last unexecuted command.
          case KeyEvent.VK_ESCAPE:
            textField.setText(commandHistory.resetHistoryLocation());
            break;
        }
      }
    });
  }