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FX-Text-Area for formatted text and other special effects.
There is a newer version: 1.11

package org.fxmisc.richtext.demo;

import java.time.Duration;

import javafx.beans.value.ChangeListener;
import javafx.css.PseudoClass;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.EventType;
import javafx.geometry.Point2D;
import javafx.scene.control.Label;
import javafx.scene.text.Font;
import javafx.stage.Popup;

import org.fxmisc.flowless.VirtualizedScrollPane;
import org.fxmisc.richtext.CodeArea;
import org.fxmisc.richtext.event.MouseOverTextEvent;

/**
 * Name: TextAreaBase
 * Description: Basisklasse f?r spezialisierte TextAreas.
 * 
 * Comment: ...
 * 
 * Copyright: Copyright (c) 2018, 2019
 * Company: >StA-Soft<
 * @author StA
 * @version 1.0
 */

public class TextAreaBase extends CodeArea implements EventHandler
{

  public static VirtualizedScrollPane addScrollPane(CodeArea codeArea)
  {
    VirtualizedScrollPane vpane = new VirtualizedScrollPane<>(codeArea);
    final PseudoClass FOCUSED = PseudoClass.getPseudoClass("focused");
    codeArea.focusedProperty().addListener((obs, oldVal, newVal) ->
    {
      vpane.pseudoClassStateChanged(FOCUSED, newVal);
    });
    vpane.getStylesheets().add(TextAreaBase.class.getResource("editors.css").toExternalForm());
    return vpane;
  }

  //===========================================================================

  /**
   * Standard-Constructor.
   */

  public TextAreaBase()
  {
  }

  /**
   * Constructor mit Text.
   * @param text Text
   */

  public TextAreaBase(String text)
  {
    super(text);
  }

  /**
   * Constructor mit Change-Listener.
   * @param cl Change-Listener
   */

  public TextAreaBase(ChangeListener cl)
  {
    if (cl != null)
    {
      textProperty().addListener(cl);
    }
  }

  //===========================================================================

  /**
   * Cursor-Position setzen.
   * @param pos Cursor-Position
   */

  public void setCaretPosition(int pos)
  {
    // positionCaret(pos);
    selectRange(pos, pos);
  }

  /**
   * ChangeListener f?r Text?nderungen.
   */

  protected ChangeListener myTextChangeListener = null;

  /**
   * ChangeListener f?r Text?nderungen setzen.
   * @param cl ChangeListener f?r Text?nderungen
   */

  public void setTextChangeListener(ChangeListener cl)
  {
    myTextChangeListener = cl;
    textProperty().addListener(cl);
  }

  /**
   * ChangeListener f?r Text?nderungen ermitteln.
   * @return ChangeListener f?r Text?nderungen
   */

  public ChangeListener getTextChangeListener()
  {
    return myTextChangeListener;
  }

  /**
   * Text setzen, dabei wird der ChangeListener f?r Text?nderungen aufgerufen,
   * falls gesetzt.
   * @param text der zu setzende Text
   */

  public void setText2(String text)
  {
    String oldtext = getText();
    // super.setText(text);
    replaceText(text);
    // MLogger.deb("|" + text + "|");
    if ((myTextChangeListener != null) && (((oldtext == null) && (text == null)) || ((oldtext != null) && oldtext.equals(text))))
    {
      myTextChangeListener.changed(textProperty(), oldtext, text);
    }
  }

  Popup popup;

  Label popupMsg;

  @Override
  public void handle(MouseOverTextEvent e)
  {
    EventType eventtype = e.getEventType();
    if (eventtype == MouseOverTextEvent.MOUSE_OVER_TEXT_BEGIN)
    {
      // int chIdx = e.getCharacterIndex();
      Point2D pos = e.getScreenPosition();
      // popupMsg.setText("Character '" + TextAreaBase.this.getText(chIdx, chIdx + 1) + "' at " + pos);
      popup.show(TextAreaBase.this, pos.getX(), pos.getY() + 10);
    }
    else if (eventtype == MouseOverTextEvent.MOUSE_OVER_TEXT_END)
    {
      popup.hide();
    }
  }

  /**
   * Tool-Tip setzen.
   * @param s Tool-Tip-Text
   */

  public void setToolTipText(String s)
  {
    // setTooltip(s != null ? new Tooltip(s) : null);
    if (s != null)
    {
      if (popup == null)
      {
        popup = new Popup();
        popupMsg = new Label();
        popupMsg.setStyle("-fx-background-color: black;" + "-fx-text-fill: white;" + "-fx-padding: 5;");
        popup.getContent().add(popupMsg);
        setMouseOverTextDelay(Duration.ofSeconds(1));
        addEventHandler(MouseOverTextEvent.MOUSE_OVER_TEXT_BEGIN, this);
        addEventHandler(MouseOverTextEvent.MOUSE_OVER_TEXT_END, this);
      }
      popupMsg.setText(s);
    }
    else
    {
      if (popup != null)
      {
        removeEventHandler(MouseOverTextEvent.MOUSE_OVER_TEXT_BEGIN, this);
        removeEventHandler(MouseOverTextEvent.MOUSE_OVER_TEXT_END, this);
        popup = null;
        popupMsg = null;
      }
    }
  }

  public void setFont(Font f)
  {
    // setStyle(
  }

}