FontDialog.java

package com;

import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;

public class FontDialog {

    private String[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();

    private String[] styleNames = { "Обычный", "Жирный", "Курсив", "Жирный курсив" };
    private int[] styles = { Font.PLAIN, Font.BOLD, Font.ITALIC, Font.BOLD | Font.ITALIC };

    private String[] fontSizeStrings = { "8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28",
            "36", "48", "72" };
    private int[] fontSizes = { 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72 };

    private JDialog fontDialog;
    private JTextArea textArea, exampleText;
    private JComboBox<String> boxFontFamily, boxFontStyle, boxFontSize;

    public FontDialog(JFrame mainFrame, JTextArea textArea) {
        fontDialog = new JDialog(mainFrame, "Шрифт", true);
        fontDialog.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        fontDialog.setSize(300, 300);
        fontDialog.setResizable(false);
        fontDialog.setLocationRelativeTo(null);
        fontDialog.setLayout(null);

        fontDialog.getRootPane().registerKeyboardAction(e -> fontDialog.dispose(),
                KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_IN_FOCUSED_WINDOW);

        this.textArea = textArea;

        initUI();

        fontDialog.setVisible(true);
    }

    private void initUI() {
        exampleText = new JTextArea("Пример текста\n\nText example\n\n文本示例\n\n0 1 2 3 4 5 6 7 8 9");
        exampleText.setFont(textArea.getFont());
        exampleText.setTabSize(1);
        exampleText.setLineWrap(true);
        exampleText.setCaretPosition(exampleText.getText().length());
        exampleText.setMargin(new Insets(3, 3, 3, 3));

        JScrollPane scrollPane = new JScrollPane(exampleText);
        scrollPane.setBounds(5, 5, 276, 145);
        fontDialog.add(scrollPane);

        JLabel fontFamily = new JLabel("Шрифт:");
        fontFamily.setBounds(10, 155, 80, 20);
        fontDialog.add(fontFamily);

        boxFontFamily = new JComboBox<String>(fonts);
        boxFontFamily.setSelectedItem(textArea.getFont().getFamily());
        boxFontFamily.setBounds(80, 155, 200, 20);
        boxFontFamily.addActionListener(e -> updateFont());
        fontDialog.add(boxFontFamily);

        JLabel fontStyle = new JLabel("Стиль:");
        fontStyle.setBounds(10, 180, 80, 20);
        fontDialog.add(fontStyle);

        boxFontStyle = new JComboBox<String>(styleNames);
        boxFontStyle.setSelectedItem(styleNames[textArea.getFont().getStyle()]);
        boxFontStyle.setBounds(80, 180, 200, 20);
        boxFontStyle.addActionListener(e -> updateFont());
        fontDialog.add(boxFontStyle);

        JLabel fontSize = new JLabel("Размер:");
        fontSize.setBounds(10, 205, 80, 20);
        fontDialog.add(fontSize);

        boxFontSize = new JComboBox<String>(fontSizeStrings);
        boxFontSize.setSelectedItem(getFontSizeString());
        boxFontSize.setBounds(80, 205, 200, 20);
        boxFontSize.addActionListener(e -> updateFont());

        fontDialog.add(boxFontSize);

        JButton buttonOK = new JButton("ОК");
        buttonOK.setBounds(94, 235, 80, 20);
        buttonOK.addActionListener(e -> {
            textArea.setFont(exampleText.getFont());
            fontDialog.dispose();
        });
        fontDialog.add(buttonOK);

        JButton buttonCancel = new JButton("Отмена");
        buttonCancel.setBounds(196, 235, 80, 20);
        buttonCancel.addActionListener(e -> fontDialog.dispose());
        fontDialog.add(buttonCancel);
    }

    private void updateFont() {
        String fontFamily = (String) boxFontFamily.getSelectedItem();
        int fontStyle = styles[boxFontStyle.getSelectedIndex()];
        int fontSize = fontSizes[boxFontSize.getSelectedIndex()];

        exampleText.setFont(new Font(fontFamily, fontStyle, fontSize));
    }

    private String getFontSizeString() {
        for (int i = 0; i < fontSizes.length; i++)
            if (fontSizes[i] == textArea.getFont().getSize())
                return fontSizeStrings[i];
        return fontSizeStrings[0];
    }
}