package sec04.exam01_borderlayout;

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class BorderLayoutExample extends JFrame {
    private JTextField txtNorth;
    private JTextArea txtCenter;
    private JButton btnSouth;

    public BorderLayoutExample() {
        this.setTitle("BorderLayoutExample");
        this.setSize(300, 200);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        // 북쪽, 중앙, 남쪽에 컴포넌트 배치
        this.getContentPane().add(getTxtNorth(), BorderLayout.NORTH);
        this.getContentPane().add(getTxtCenter(), BorderLayout.CENTER);
        this.getContentPane().add(getBtnSouth(), BorderLayout.SOUTH);
    }

    private JTextField getTxtNorth() {
        if (txtNorth == null) {
            txtNorth = new JTextField();
            txtNorth.setText("북쪽 컴포넌트");
            txtNorth.setBackground(Color.YELLOW);
        }
        return txtNorth;
    }

    private JTextArea getTxtCenter() {
        if (txtCenter == null) {
            txtCenter = new JTextArea();
            txtCenter.append("중앙 컴포넌트\n");
            txtCenter.append("동쪽/서쪽이 없으면 중앙이 확장됩니다.\n");
        }
        return txtCenter;
    }

    private JButton getBtnSouth() {
        if (btnSouth == null) {
            btnSouth = new JButton("남쪽 컴포넌트");
        }
        return btnSouth;
    }

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