Main.java Source code

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Source

import java.awt.Point;

import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.event.HyperlinkEvent;

public class Main {
    public static void main(String[] args) {
        JFrame frame = new PaneWithScrollFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

class PaneWithScrollFrame extends JFrame {
    String TEXT = "<html>" + "<head>" + "</head>" + "<body>" + "<br/><br/><br/><br/><br/>" + "<br/><br/><br/><br/>"
            + "<br/><br/><br/><br/>" + "<br/><br/><br/><br/>" + "<br/><br/><br/><br/>"
            + "<p><a href=\"#top\">Go top</a></p>" + "</body>" + "</html>";
    String TOP = "#top";

    public PaneWithScrollFrame() {
        this.addComponents();
        super.setSize(640, 180);
    }

    private void addComponents() {
        JEditorPane editorPane = new JEditorPane();
        editorPane.setContentType("text/html");
        editorPane.setEditable(false);
        editorPane.setText(TEXT);

        JScrollPane scrollpane = new JScrollPane(editorPane);

        editorPane.addHyperlinkListener(e -> {
            if (HyperlinkEvent.EventType.ACTIVATED.equals(e.getEventType())) {
                String description = e.getDescription();
                if (TOP.equals(description)) {
                    JViewport viewport = scrollpane.getViewport();
                    viewport.setViewPosition(new Point(0, 0));
                }
            }
        });
        super.add(scrollpane);
    }
}