package sec03.exam05_jscrollpane;

import java.awt.BorderLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class JScrollPaneExample extends JFrame {
    private JScrollPane scrollImage;
    private JLabel lblImage;

    public JScrollPaneExample() {
        this.setTitle("JScrollPaneExample");
        this.setSize(350, 230);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        // 이미지가 윈도우보다 크면 자동으로 스크롤 생성됨
        this.getContentPane().add(getScrollImage(), BorderLayout.CENTER);
    }

    private JScrollPane getScrollImage() {
        if (scrollImage == null) {
            scrollImage = new JScrollPane(getLblImage());
        }
        return scrollImage;
    }

    public JLabel getLblImage() {
        if (lblImage == null) {
            lblImage = new JLabel();
            lblImage.setIcon(new ImageIcon(getClass().getResource("snow.jpg")));
        }
        return lblImage;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JScrollPaneExample jFrame = new JScrollPaneExample();
            jFrame.setVisible(true);
        });
    }
}