org.fxmisc.richtext.demo.lineindicator.LineIndicatorDemo Maven / Gradle / Ivy

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package org.fxmisc.richtext.demo.lineindicator;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import org.fxmisc.richtext.CodeArea;
import org.fxmisc.richtext.LineNumberFactory;
import org.fxmisc.richtext.StyledTextArea;

import java.util.function.IntFunction;

/**
 * Name: LineIndicatorDemo
 * Description: Written as a StackOverflow answer (2015) by Tomas Mikula,
 * which Jordan Martinez then extracted into this demo.
 * The author dedicates this file to the public domain.
 * Demonstrates the usage of {@link StyledTextArea#paragraphGraphicFactoryProperty()}.
 * 
 * Comment: ...
 * 
 * Copyright: Copyright (c) 2016-2019
 * Company: >StA-Soft<
 * @author Tomas Mikula, StA
 * @version 1.0
 */

public class LineIndicatorDemo extends Application
{

  /**
   * Main-Methode.
   * @param args Kommandozeilenparameter
   */

  public static void main(String[] args)
  {
    launch(args);
  }

  @Override
  public void start(Stage primaryStage)
  {
    CodeArea codeArea = new CodeArea();

    IntFunction numberFactory = LineNumberFactory.get(codeArea);
    IntFunction arrowFactory = new ArrowFactory(codeArea.currentParagraphProperty());
    IntFunction graphicFactory = line ->
    {
      HBox hbox = new HBox(numberFactory.apply(line), arrowFactory.apply(line));
      hbox.setAlignment(Pos.CENTER_LEFT);
      return hbox;
    };
    codeArea.setParagraphGraphicFactory(graphicFactory);
    codeArea.replaceText("The green arrow will only be on the line where the caret appears.\n\nTry it.");
    codeArea.moveTo(0, 0);

    primaryStage.setScene(new Scene(new StackPane(codeArea), 600, 400));
    primaryStage.show();
  }

}