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FX-Text-Area for formatted text and other special effects.

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package org.fxmisc.richtext.demo.lineindicator;

import javafx.beans.value.ObservableValue;
import javafx.scene.Node;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;

import org.reactfx.value.Val;

import java.util.function.IntFunction;

/**
 * Name: ArrowFactory
 * Description: Given the line number, return a node (graphic) to display to the left of a line.
 * 
 * Comment: ...
 * 
 * Copyright: Copyright (c) 2016-2019
 * Company: >StA-Soft<
 * @author StA
 * @version 1.0
 */

public class ArrowFactory implements IntFunction
{

  /**
   * Zeile.
   */

  private final ObservableValue myShownLine;

  /**
   * Constructor.
   * @param pShownLine Zeile
   */

  ArrowFactory(ObservableValue pShownLine)
  {
    myShownLine = pShownLine;
  }

  @Override
  public Node apply(int lineNumber)
  {
    Polygon triangle = new Polygon(0.0, 0.0, 10.0, 5.0, 0.0, 10.0);
    triangle.setFill(Color.GREEN);
    ObservableValue visible = Val.map(myShownLine, sl -> sl == lineNumber);
    triangle.visibleProperty().bind(Val.flatMap(triangle.sceneProperty(), scene -> scene != null ? visible : Val.constant(false)));
    return triangle;
  }

}