[자바] Gui 프로그래밍

1. 마우스로 텍스트 움직이기 

package hello;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class MouseListenerEx extends JFrame{
	private JLabel la = new JLabel("hello");
	
	public MouseListenerEx() {
		setTitle("Mouse 이벤트 예제");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);;
		Container c = getContentPane();
		c.addMouseListener(new MyMouseListener());
		
		c.setLayout(null);
		la.setSize(50,20);
		la.setLocation(30, 30);
		c.add(la);
		
		setSize(250, 250);
		setVisible(true);
	}
	class MyMouseListener implements MouseListener {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();
			int y = e.getY();
			la.setLocation(x, y);
		}
		public void mouseReleased(MouseEvent e) {}
		public void mouseClicked(MouseEvent e) {}
		public void mouseEntered(MouseEvent e) {}
		public void mouseExited(MouseEvent e) {}
	}
	public static void main(String[] args) {
		new MouseListenerEx();
	}
}

class MyMouseListener implements MouseListener {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();
			int y = e.getY();
			la.setLocation(x, y);
		}
		public void mouseReleased(MouseEvent e) {}
		public void mouseClicked(MouseEvent e) {}
		public void mouseEntered(MouseEvent e) {}
		public void mouseExited(MouseEvent e) {}
	}

를 Adapter를 이용하여 간추릴 수 있다.

class MyMouseAdapter extends MouseAdapter {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();
			int y = e.getY();
			la.setLocation(x, y);
		}
	}

완성된 코드 

package hello;

import javax.swing.*; // 스윙 컴포넌트 api
import java.awt.*; // 그래픽을 처리하는 api
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class MouseListenerEx extends JFrame /*컨테이너 */{
	private JLabel la = new JLabel("hello");
	
	public MouseListenerEx() {
		setTitle("Mouse 이벤트 예제");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		// EXIT_ON_CLOSE : 종료할때 에플리케이션도 함께 종료 
		Container c = getContentPane();
		c.addMouseListener(new MyMouseAdapter());
		
		c.setLayout(null);
		la.setSize(50,20);
		la.setLocation(30, 30);
		c.add(la);
		
		setSize(250, 250);
		setVisible(true); // 스윙 프레임 출력
	}
	class MyMouseAdapter extends MouseAdapter {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();
			int y = e.getY();
			la.setLocation(x, y);
		}
	}
	public static void main(String[] args) {
		new MouseListenerEx();
	}
}

결과는 첫번째 코드와 같지만 코드의 길이가 짧아진 것을 알 수 있다.

 

2. 상하좌우키로 텍스트 움직이기 

package hello;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class FlyingTextEx extends JFrame{
	private final int FLYING_UNIT = 10;
	private JLabel la = new JLabel("HELLO");
	public FlyingTextEx() {
		setTitle("상,하,좌,우 키를 이용하여 텍스트 움직이기");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(null);
		c.addKeyListener(new  MyKeyListener());
		la.setLocation(50,50);
		la.setSize(100, 20);
		c.add(la);
		setSize(300,300);
		setVisible(true);
		c.setFocusable(true);
		c.requestFocus();
		
		c.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				Component com = (Component)e.getSource();
				com.setFocusable(true);
				com.requestFocus();
			}
		});
		}
	class MyKeyListener extends KeyAdapter {
		public void keyPressed(KeyEvent e) {
			int KeyCode = e.getKeyCode();
			
			switch (KeyCode) {
			case KeyEvent.VK_UP:
				la.setLocation(la.getX(), la.getY()-FLYING_UNIT);
				break;
			case KeyEvent.VK_DOWN:
				la.setLocation(la.getX(), la.getY()+FLYING_UNIT);
				break;
			case KeyEvent.VK_LEFT:
				la.setLocation(la.getX()-FLYING_UNIT, la.getY());
				break;
			case KeyEvent.VK_RIGHT:
				la.setLocation(la.getX()+FLYING_UNIT, la.getY());
			default:
				break;
			}
		}
	}
	public static void main(String[] args) {
		new FlyingTextEx();
	}
}

3.마우스와 마우스 모션 이벤트 활용

package hello;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MouseListenerAllEx extends JFrame{
	private JLabel la = new JLabel("No Mouse Event");
	
	public MouseListenerAllEx() {
		setTitle("MouseListener와 MouseMotionListener 예제");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout());
		
		MyMouseListener listener = new MyMouseListener();
		c.addMouseListener(listener);
		c.addMouseMotionListener(listener);
		
		c.add(la);
		
		setSize(300, 200);
		setVisible(true);
	}
	class MyMouseListener implements MouseListener, MouseMotionListener{
		public void mousePressed(MouseEvent e) {
			la.setText("mousePressed("+ e.getX()+", "+e.getY()+")");
		}
		public void mouseReleased(MouseEvent e) {
			la.setText("mouseReleased("+ e.getX()+", "+e.getY()+")");
		}

		@Override
		public void mouseDragged(MouseEvent e) {
			la.setText("mouseDragged("+ e.getX()+", "+e.getY()+")");
		}
		@Override
		public void mouseMoved(MouseEvent e) {
			la.setText("mouseMoved("+ e.getX()+", "+e.getY()+")");
			
		}

		@Override
		public void mouseClicked(MouseEvent e) {}
		public void mouseEntered(MouseEvent e) {
			Component c = (Component)e.getSource();
			c.setBackground(Color.CYAN);
		}

		public void mouseExited(MouseEvent e) {
			Component c = (Component)e.getSource();
			c.setBackground(Color.YELLOW);
		}
	}
	public static void main(String[] args) {
		new MouseListenerAllEx();
	}
}

4. 키를 입력받으면 컨텐트팬의 배경을 초록색으로, % 키를 입력받으면 노란색으로 변경

package hello;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class KeyCodeEx extends JFrame{
	private JLabel la = new JLabel();
	
	public KeyCodeEx() {
		setTitle("key Code 예제 : f1 키 - 초록색, %키 - 노란색");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		
		c.addKeyListener(new MyKeyListener());
		c.add(la);
		
		setSize(300, 150);
		setVisible(true);
		
		c.setFocusable(true);
		c.requestFocus();
	}
	class MyKeyListener extends KeyAdapter {
		public void keyPressed(KeyEvent e) {
			Container contentPane = (Container)e.getSource();
			la.setText(e.getKeyText(e.getKeyCode()));
		
			if(e.getKeyChar() == '%') {
				contentPane.setBackground(Color.YELLOW);
			}
			else if(e.getKeyCode() == KeyEvent.VK_F1) {
				contentPane.setBackground(Color.GREEN);
			}
		}
	}
	public static void main(String[] args) {
		new KeyCodeEx();
	}
}

(원래는 화면에 f1과 %가 나오는데 캡쳐를 했더니... alt가 나왔다...)

 

5. 더블클릭 시 컨텐트팬의 배경색 변경

package hello;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ClickAndDoubleClickEx extends JFrame{
	public ClickAndDoubleClickEx() {
		setTitle("Click and DoubleClick 예제");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.addMouseListener(new MyMouseListener());
		setSize(300,200);
		setVisible(true);
	}
	class MyMouseListener extends MouseAdapter {
		public void mouseClicked(MouseEvent e) {
			if(e.getClickCount() == 2) {
				int r = (int )(Math.random()* 256);
				int g = (int )(Math.random()* 256);
				int b = (int )(Math.random()* 256);
				Component c = (Component)e.getSource();
				c.setBackground(new Color(r,g,b));
			}
		}
	}
	public static void main(String[] args) {
		new ClickAndDoubleClickEx();
	}
}