Swing Key Listener - 6

목차

1. Key Listener 사용

package ch06;

import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JTextArea;

/**
 * 키 이벤트 리스너 사용해보기
 */

public class MyKeyEvent extends JFrame implements KeyListener {

	private JTextArea textArea;
	public MyKeyEvent() {
		initData();
		setInitLayout();
		addEventListener();
	}

	private void initData() {
		setSize(500, 500);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		super.setResizable(false); // 프레임 사이즈 조절 불가

		textArea = new JTextArea();
	}

	private void setInitLayout() {
		// 좌표 기준으로 세팅하고 싶다면 null
		setLayout(new BorderLayout());
		add(textArea);
		setVisible(true);
	}

	private void addEventListener() {
		// textArea 위에서 사용자가 키보드를 누르면 감지해서
		// 나에게 (코드기준) 알려줘
		textArea.addKeyListener(this);
	}

	@Override
	public void keyTyped(KeyEvent e) {
	}

	@Override
	public void keyPressed(KeyEvent e) {
		// System.out.println("keyPressed : " + e.getKeyCode());
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// 문제 1
		// 제어문을 활용해서 방향키 위 아래 왼쪽 오른쪽이 눌렀다가 때면
		// 콘솔창에 한글로 위 아래 왼쪽 오른쪽 글자를 표기 하시오
		if (e.getKeyCode() == KeyEvent.VK_UP) {
			System.out.println("위");
		} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			System.out.println("아래");
		} else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			System.out.println("왼쪽");
		} else if (e.getKeyCode() == KeyEvent.VK_UP) {
			System.out.println("오른쪽");
		}
	}
}

2. 미니게임 (오브젝트 움직이기)

방향키 입력에 따라 움직이는 오브젝트를 화면에 띄워서 움직여라

package ch06;

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class MiniGame1 extends JFrame {

	private JLabel jPlayer;
	private int jPlayerX = 100;
	private int jPlayerY = 100;
	private final int ONE_STEP = 10;
	private final int UP_END = 10;
	private final int LEFT_END = 10;
	private final int RIGHT_END = 390;
	private final int DOWN_END = 390;

	public MiniGame1() {
		initData();
		setInitLayout();
		addEventListener();
	}

	private void initData() {
		setSize(500, 500);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jPlayer = new JLabel("플레이어1");
		jPlayer.setSize(100, 100);
	}

	private void setInitLayout() {
		// 좌표 기반으로 배치관리자 변경
		setLayout(null);
		add(jPlayer);
		jPlayer.setLocation(jPlayerX, jPlayerY);
		setVisible(true);
	}

	private void addEventListener() {
		// jPlayer 객체에게서만 keyListener 동작을 시키고자 한다면
		// 익명 구현클래스로 KeyListener 인터페이스를 재정의할 수 있다.
		// jPlayer.addKeyListener(this);

		addKeyListener(new KeyListener() {

			@Override
			public void keyTyped(KeyEvent e) {
			}

			@Override
			public void keyReleased(KeyEvent e) {
			}

			@Override
			public void keyPressed(KeyEvent e) {
				switch (e.getKeyCode()) {
				case KeyEvent.VK_UP:
					System.out.println("위");
					if (jPlayerY <= UP_END) {
						jPlayerY = UP_END;
					} else {
						jPlayerY -= ONE_STEP;
					}
					jPlayer.setLocation(jPlayerX, jPlayerY);
					break;
				case KeyEvent.VK_LEFT:
					System.out.println("왼쪽");
					if (jPlayerX <= LEFT_END) {
						jPlayerX = LEFT_END;
					} else {
						jPlayerX -= ONE_STEP;
					}
					jPlayer.setLocation(jPlayerX, jPlayerY);
					break;
				case KeyEvent.VK_RIGHT:
					System.out.println("오른쪽");
					if (jPlayerX >= RIGHT_END) {
						jPlayerX = RIGHT_END;
					} else {
						jPlayerX += ONE_STEP;
					}
					jPlayer.setLocation(jPlayerX, jPlayerY);
					break;
				case KeyEvent.VK_DOWN:
					System.out.println("아래");
					if (jPlayerY >= DOWN_END) {
						jPlayerY = DOWN_END;
					} else {
						jPlayerY += ONE_STEP;
					}
					jPlayer.setLocation(jPlayerX, jPlayerY);
					break;
				}
			}
		});
	}

	// 코드 테스트
	public static void main(String[] args) {
		new MiniGame1();
	} // end of main
} // end of class

좌표 기반으로 설정 할때는
반드시 좌표와 사이즈를 설정해주어야 한다

3. 미니게임 (그림 위 그림 오브젝트 움직이기)

package ch06;

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class MiniGame2 extends JFrame{
	
	JLabel backgroundMap;
	JLabel player;
	private int jPlayerX = 500;
	private int jPlayerY = 535;
	private final int FRAME_WIDTH = 1000;
	private final int FRAME_HEIGHT = 600;
	private final int PLAYER_WIDTH = 50;
	private final int PLAYER_HEIGHT = 50;
	private final int MOVE_DISTANCE = 30;
	private final int UP_END = MOVE_DISTANCE;
	private final int LEFT_END = 70;
	private final int RIGHT_END = FRAME_WIDTH - PLAYER_WIDTH - 60;
	private final int DOWN_END = FRAME_HEIGHT - PLAYER_HEIGHT - MOVE_DISTANCE;
	
	public MiniGame2() {
		initData();
		setInitLayout();
		addEventListener();
	}
	
	private void initData() {
		setSize(FRAME_WIDTH, FRAME_HEIGHT + 38);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		backgroundMap = new JLabel(new ImageIcon("images/backgroundMap.png"));
		backgroundMap.setSize(FRAME_WIDTH, FRAME_HEIGHT);
		backgroundMap.setLocation(0, 0);
		player = new JLabel(new ImageIcon("images/playerR.png"));
		player.setSize(PLAYER_WIDTH, PLAYER_HEIGHT);
		player.setLocation(jPlayerX, jPlayerY);
	}
	private void setInitLayout() {
		setLayout(null);
		add(backgroundMap);
		backgroundMap.add(player);
		setVisible(true);
	}
	private void addEventListener() {
		addKeyListener(new KeyListener() {
			
			@Override
			public void keyTyped(KeyEvent e) {
			}
			
			@Override
			public void keyReleased(KeyEvent e) {
			}
			
			@Override
			public void keyPressed(KeyEvent e) {
				switch (e.getKeyCode()) {
				case KeyEvent.VK_UP:
					System.out.println("위");
					if (jPlayerY <= UP_END) {
						jPlayerY = UP_END;
					} else {
						jPlayerY -= MOVE_DISTANCE;
					}
					break;
				case KeyEvent.VK_LEFT:
					System.out.println("왼쪽");
					if (jPlayerX <= LEFT_END + MOVE_DISTANCE) {
						jPlayerX = LEFT_END;
					} else {
						jPlayerX -= MOVE_DISTANCE;
					}
					player.setIcon(new ImageIcon("images/playerL.png"));
					break;
				case KeyEvent.VK_RIGHT:
					System.out.println("오른쪽");
					if (jPlayerX >= RIGHT_END - MOVE_DISTANCE) {
						jPlayerX = RIGHT_END;
					} else {
						jPlayerX += MOVE_DISTANCE;
					}
					player.setIcon(new ImageIcon("images/playerR.png"));
					break;
				case KeyEvent.VK_DOWN:
					System.out.println("아래");
					if (jPlayerY >= DOWN_END) {
						jPlayerY = DOWN_END;
					} else {
						jPlayerY += MOVE_DISTANCE;
					}
					break;
				}
				player.setLocation(jPlayerX, jPlayerY);
			}
		});
	}
	
	// 코드 테스트
	public static void main(String[] args) {
		new MiniGame2();
	}
}

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