Java：實驗四 Java圖形介面與事件處理（頭歌）

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
 
/**
 * Created by IntelliJ IDEA.
 *
 * @Author :
 * @create: 2023/03/29 10:15
 */
public class ArtFont extends JFrame implements ActionListener, ItemListener {
    JComboBox fontType;//字型樣式下拉框
    JComboBox fontSize;//字型大小下拉框
    JComboBox windowStyle;//窗體樣式下拉框
    JCheckBox boldBx;// 粗體按鈕
    JCheckBox italicBx;// 斜體按鈕
    JButton colorBtn;// 顏色按鈕；
    String[] fontNames;// 字型名稱;
    String[] fontSizes;// 字型大小；
    JLabel label;// 輸入提示標籤；
    JTextField inputText;// 文字輸入框；
    JTextArea txtArea;// 文字顯示區;
    JPanel northPanel;// 字型設定；
    JPanel centerPanel;// 顯示效果區
    JPanel southPanel;//樣式設定
    Font font;
    int boldStyle, italicStyle, underlineStyle;
    int fontSizeStyle;
    String fontNameStyle;
    Color colorStyle = Color.black;// 設定字型的預設顏色為黑色;
    String[] style = { "預設顯示效果", "Windows顯示效果", "Unix顯示效果" };
 
    public ArtFont() {
        super("字型設定");
        // 設定預設字型
        boldStyle = 0;
        italicStyle = 0;
        underlineStyle = 0;
        fontSizeStyle = 10;
        fontNameStyle = "宋體";
        font = new Font(fontNameStyle, boldStyle + italicStyle, fontSizeStyle);
 
        northPanel = getNorthPanel();
        centerPanel = getCenterPanel();
        southPanel = getSouthPanel();
        // 設定容器;
        Container container = getContentPane();
        container.setLayout(new BorderLayout());
 
        //將northPanel新增到窗體的北部
        container.add(northPanel, BorderLayout.NORTH);
 
        //將centerPanel新增到窗體的中部
        container.add(centerPanel, BorderLayout.CENTER);
 
        //將southPanel新增到窗體的南部
        container.add(southPanel, BorderLayout.SOUTH);
 
        setSize(500, 300);
        //將窗體位於螢幕的中央
        this.setLocationRelativeTo(null);
 
        setVisible(true);
    }
 
    private JPanel getNorthPanel() {
        JPanel panel = new JPanel();
        label = new JLabel("輸入");
        inputText = new JTextField(10);
        boldBx = new JCheckBox("粗體");
        italicBx = new JCheckBox("斜體");
        colorBtn = new JButton("顏色");
 
        panel.add(label);
        panel.add(inputText);
        panel.add(boldBx);
        panel.add(italicBx);
        panel.add(colorBtn);
          /***  
 
 
 
 
        在下面括號中改名字
        JTextArea("計xxxx xxxxxxxx xx")
   
 
 
 
 
             ***/
        JTextArea textArea=	new JTextArea("計xxxx xxxxxxxx xx");
        //註冊事件監視器
        inputText.addActionListener(this);
        colorBtn.addActionListener(this);
        boldBx.addItemListener(this);
        italicBx.addItemListener(this);
        panel.add(textArea);
        return panel;
    }
 
 
 
    private JPanel getCenterPanel() {
        JPanel panel = new JPanel();
        txtArea =  new JTextArea();
        panel.setLayout(new BorderLayout());
        panel.add(new JScrollPane(txtArea), BorderLayout.CENTER);
 
        return panel;
    }
 
    private JPanel getSouthPanel() {
        JPanel panel = new JPanel();
        //獲得系統預設字型
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        fontNames = ge.getAvailableFontFamilyNames();
        fontType = new JComboBox(fontNames);
        //設定字型大小
        fontSizes = new String[63];
        for (int i = 0; i < fontSizes.length; i++) {
            fontSizes[i] = Integer.toString(i+10);
        }
        fontSize = new JComboBox(fontSizes);
        windowStyle = new JComboBox(style);
 
        panel.add(fontType);
        panel.add(fontSize);
        panel.add(windowStyle);
        //註冊事件監視器
        fontType.addItemListener(this);
        fontSize.addItemListener(this);
        windowStyle.addItemListener(this);
 
        return panel;
    }
    public static void main(String args[]) {
        ArtFont artFont = new ArtFont();
        artFont.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
 
 
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == inputText) {
            txtArea.setText(inputText.getText());
        } else if (e.getSource() == colorBtn) {
            colorStyle=JColorChooser.showDialog(this,"請選擇一種顏色",colorStyle);
            colorBtn.setForeground(colorStyle);
            txtArea.setForeground(colorStyle);
        }
    }
 
    @Override
    public void itemStateChanged(ItemEvent e) {
        if (e.getSource() == boldBx) {
            if (boldBx.isSelected()){
                boldStyle=Font.BOLD;
            }else {
                boldStyle=Font.PLAIN;
            }
 
        } else if (e.getSource() == italicBx) {
            if (italicBx.isSelected()){
                italicStyle=Font.ITALIC;
            }else {
                italicStyle=Font.PLAIN;
            }
 
        } else if (e.getSource() == fontType) {
            fontNameStyle=(String) e.getItem();
 
        } else if (e.getSource() == fontSize) {
            fontSizeStyle=Integer.parseInt((String) e.getItem());
 
        } else if (e.getSource() == windowStyle) {
            String s = (String) e.getItem();
            String className = "";
            if (s.equals("Windows顯示效果"))
                className = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
            else if (s.equals("Unix顯示效果"))
                className = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
            else if (s.equals("預設顯示效果"))
                className = UIManager.getCrossPlatformLookAndFeelClassName();
            try {
                UIManager.setLookAndFeel(className);
                SwingUtilities.updateComponentTreeUI(this);
            } catch (Exception de) {
                System.out.println("Exception happened!");
            }
        }
        font = new Font(fontNameStyle, boldStyle + italicStyle, fontSizeStyle);
        txtArea.setFont(font);
    }
 
}