java自定义Swing组件模型、组件、UI委托

Question

一般来说，我对java非常陌生，尤其是使用Swing。我已经创建了一个自定义的swing组件，它可以使用滑块放大和缩小图片。但是，我现在需要这样做，以便我的代码代表三个类
•模型

•UI委托

•捆绑模型和UI委托的组件实现
一起

我非常迷茫，当我开始将代码拆分为不同的类时，我似乎无法让代码正常运行。当在单个类中实现时，我的接口可以正常工作。任何关于如何最好地重新工具化这段代码以使其适合前面提到的模型的帮助都将不胜感激。这是我的密码

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;

import java.io.File;
import java.net.URL;

import javax.imageio.ImageIO;

public class CustomComponent extends JComponent implements ChangeListener {

JPanel gui;
JLabel imageCanvas;
Dimension size;
double scale = 1.0;
private BufferedImage image;

public CustomComponent() {
    size = new Dimension(10, 10);
    setBackground(Color.black);
    try {
         image = ImageIO.read(new File("car.jpg"));
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

public void setImage(Image image) {
    imageCanvas.setIcon(new ImageIcon(image));
}

public void initComponents() {
    if (gui == null) {
        gui = new JPanel(new BorderLayout());
        gui.setBorder(new EmptyBorder(5, 5, 5, 5));
        imageCanvas = new JLabel();
        JPanel imageCenter = new JPanel(new GridBagLayout());
        imageCenter.add(imageCanvas);
        JScrollPane imageScroll = new JScrollPane(imageCenter);
        imageScroll.setPreferredSize(new Dimension(300, 100));
        gui.add(imageScroll, BorderLayout.CENTER);
    }
}

public Container getGui() {
    initComponents();
    return gui;
}

public void stateChanged(ChangeEvent e) {
    int value = ((JSlider) e.getSource()).getValue();
    scale = value / 100.0;
    paintImage();
}

protected void paintImage() {

    int imageWidth = image.getWidth();
    int imageHeight = image.getHeight();
    BufferedImage bi = new BufferedImage(
            (int)(imageWidth*scale), 
            (int)(imageHeight*scale), 
            image.getType());
    Graphics2D g2 = bi.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
    AffineTransform at = AffineTransform.getTranslateInstance(0, 0);
    at.scale(scale, scale);
    g2.drawRenderedImage(image, at);
    setImage(bi);
}

public Dimension getPreferredSize() {
    int w = (int) (scale * size.width);
    int h = (int) (scale * size.height);
    return new Dimension(w, h);
}

private JSlider getControl() {
    JSlider slider = new JSlider(JSlider.HORIZONTAL, 1, 500, 50);
    slider.setMajorTickSpacing(50);
    slider.setMinorTickSpacing(25);
    slider.setPaintTicks(true);
    slider.setPaintLabels(true);
    slider.addChangeListener(this);
    return slider;
}

public static void main(String[] args) {
    CustomComponent app = new CustomComponent();
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(app.getGui());
    app.setImage(app.image);

    // frame.getContentPane().add(new JScrollPane(app));  
    frame.getContentPane().add(app.getControl(), "Last");
    frame.setSize(700, 500);
    frame.setLocation(200, 200);
    frame.setVisible(true);
}
}