CoreJava1/chapter12/src/groupLayout/FontFrame.java at v11 · WisdomApple/CoreJava1 · GitHub

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package groupLayout;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;

/**
 * A frame that uses a group layout to arrange font selection components.
 */
public class FontFrame extends JFrame {
    public static final int TEXT_ROWS = 10;
    public static final int TEXT_COLUMNS = 10;

    private JComboBox<String> face;
    private JComboBox<Integer> size;
    private JCheckBox bold;
    private JCheckBox italic;
    private JTextArea sample;

    public FontFrame() {
        ActionListener listener = e -> updateSample();

        // construct components

        JLabel faceLabel = new JLabel("Face: ");

        face = new JComboBox<>(new String[]{
                "Serif", "SansSerif", "Monospaced", "Dialog", "DialogInput"
        });
        face.addActionListener(listener);

        JLabel sizeLabel = new JLabel("Size: ");

        size = new JComboBox<>(new Integer[]{8, 10, 12, 15, 18, 24, 36, 48});

        size.addActionListener(listener);

        bold = new JCheckBox("Bold");
        bold.addActionListener(listener);


        italic = new JCheckBox("Italic");
        italic.addActionListener(listener);

        sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
        sample.setText("The quick brown fox jumps over the lazy dog");
        sample.setEditable(false);
        sample.setLineWrap(true);

        JScrollPane pane = new JScrollPane(sample);

        GroupLayout layout = new GroupLayout(getContentPane());
        setLayout(layout);
        layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGroup(
                        layout.createSequentialGroup().addContainerGap().addGroup(
                                layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(
                                        GroupLayout.Alignment.TRAILING,
                                        layout.createSequentialGroup().addGroup(
                                                layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
                                                        .addComponent(faceLabel).addComponent(sizeLabel))
                                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                                .addGroup(
                                                        layout.createParallelGroup(
                                                                GroupLayout.Alignment.LEADING, false)
                                                                .addComponent(size).addComponent(face)))
                                        .addComponent(italic).addComponent(bold)).addPreferredGap(
                                LayoutStyle.ComponentPlacement.RELATED).addComponent(pane)
                                .addContainerGap()));

        layout.linkSize(SwingConstants.HORIZONTAL, face, size);

        layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGroup(
                        layout.createSequentialGroup().addContainerGap().addGroup(
                                layout.createParallelGroup(GroupLayout.Alignment.LEADING).addComponent(
                                        pane, GroupLayout.Alignment.TRAILING).addGroup(
                                        layout.createSequentialGroup().addGroup(
                                                layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                                        .addComponent(face).addComponent(faceLabel))
                                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                                .addGroup(
                                                        layout.createParallelGroup(
                                                                GroupLayout.Alignment.BASELINE).addComponent(size)
                                                                .addComponent(sizeLabel)).addPreferredGap(
                                                LayoutStyle.ComponentPlacement.RELATED).addComponent(
                                                italic, GroupLayout.DEFAULT_SIZE,
                                                GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                                .addComponent(bold, GroupLayout.DEFAULT_SIZE,
                                                        GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                                .addContainerGap()));
        pack();
    }

    public void updateSample() {
        String fontFace = (String) face.getSelectedItem();
        int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
                + (italic.isSelected() ? Font.ITALIC : 0);
        int fontSize = size.getItemAt(size.getSelectedIndex());
        Font font = new Font(fontFace, fontStyle, fontSize);
        sample.setFont(font);
        sample.repaint();
    }
}