Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.Action;
import javax.swing.JComboBox;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.StyledDocument;
import javax.swing.text.StyledEditorKit;

public class Main extends JPanel {
    Integer[] ITEMS = { 9, 10, 11, 12, 14, 16, 18, 20, 24, 32 };
    JEditorPane editorPane = new JEditorPane();
    JComboBox<Integer> fontBox = new JComboBox<Integer>(ITEMS);
    StyledDocument doc = new DefaultStyledDocument();
    StyledEditorKit styledEditorKit = new StyledEditorKit();

    public Main() {
        editorPane.setDocument(doc);
        editorPane.setEditorKit(styledEditorKit);
        JScrollPane scrollpane = new JScrollPane(editorPane);
        scrollpane.setPreferredSize(new Dimension(500, 400));
        JPanel comboPanel = new JPanel();
        comboPanel.add(fontBox);

        setLayout(new BorderLayout());
        add(scrollpane, BorderLayout.CENTER);
        add(comboPanel, BorderLayout.SOUTH);

        Document doc = editorPane.getDocument();
        for (int i = 0; i < 20; i++) {
            int offset = doc.getLength();
            String str = "This is line number: " + i + "\n";
            try {
                doc.insertString(offset, str, null);
            } catch (BadLocationException e) {
                e.printStackTrace();
            }
        }

        fontBox.addActionListener(e -> {
            int size = (Integer) fontBox.getSelectedItem();
            Action fontAction = new StyledEditorKit.FontSizeAction(String.valueOf(size), size);
            fontAction.actionPerformed(e);
        });
    }

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