Day 13 - UI 구현하기

시스템 스크린 사이즈 갖고오기

java.awt.Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screen = kit.getScreenSize();
int w, h;
w = screen.width/2;
h = screen.height/2;

Dimension app = new Dimension(500, 800);

setSize(app);
setResizable(false);
setLocation(w-app.width/2, h-app.height/2);
setVisible(true);  

Event 만들기

윈도우 리스너 가져오기

public class Ex02 extends Frame implements WindowListener{

    public Ex02() {
        addWindowListener(this);

        setBounds(0, 100, 400, 300);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex02();

    }

    @Override
    public void windowOpened(WindowEvent e) {
        System.out.println("call windowOpened");
    }

    @Override
    public void windowClosing(WindowEvent e) {
        System.out.println("call windowClosing"); // 창의 "x"버튼을 눌렀을 떄 
//        setVisible(false); // 창을 안보이게 하기
//        System.exit(0); // jvm 강제로 종료시키기
        dispose(); // window를 deactivate 시킨 후 windowClosed를 호출한다.
    }

    @Override
    public void windowClosed(WindowEvent e) {
        System.out.println("call windowClosed"); // 종료시 후행작업을 수행한다. 
    }

    @Override
    public void windowIconified(WindowEvent e) {
        System.out.println("call windowIconified"); // 창 최소화 
    }

    @Override
    public void windowDeiconified(WindowEvent e) {
        System.out.println("call windowDeiconified"); // 창 최소화 해제 
    }

    @Override
    public void windowActivated(WindowEvent e) {
        System.out.println("call windowActivated");
    }

    @Override
    public void windowDeactivated(WindowEvent e) {
        System.out.println("call windowDeactivated");
    }
}

public class Ex03 implements WindowListener {
    static Frame f;

    public static void main(String[] args) {
        f = new Frame();
        f.addWindowListener(new Ex03());
        f.setBounds(0, 100, 200, 200);
        f.setVisible(true);

    }

    @Override
    public void windowClosing(WindowEvent e) {
        f.dispose();
    }

마우스로 버튼 클릭시 이벤트 발생

MouseListener

public class Ex04 extends Frame implements MouseListener{
//    Button btn;
    JLabel la;

    public Ex04() {
        setLayout(null);
        ImageIcon icon = new ImageIcon("airplane.jpg");
////        btn = new Button("button");
//        btn = new JLabel();
//        btn.setIcon(icon);
//        btn.setSize(200, 100);
//        btn.setLocation(100, 100);
////        btn.addMouseListener(this);
//        this.addMouseListener(this); // 창과 마우스의 상호작용 반환 
//        add(btn);

//        Toolkit kit = Toolkit.getDefaultToolkit();
//        Image img = kit.createImage("airplane.png");

        la = new JLabel();
        la.setIcon(icon);
        la.setSize(200, 100);
        la.setLocation(100, 100);
        this.addMouseListener(this);
        add(la);


        setBounds(100, 100, 400, 300);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex04();
    }

    @Override
    public void mousePressed(MouseEvent e) {
//        System.out.println("call mousePressed");
        int x = e.getX();
        int y = e.getY();
        la.setLocation(x-50, y-50);
    }
}

MouseMotionListender

public class Ex05 extends Frame implements MouseMotionListener {
    JLabel la;

    public Ex05() {
        setLayout(null);
        addMouseMotionListener(this);
        ImageIcon icon = new ImageIcon("airplane.jpg");

        la = new JLabel(icon);
//        la.setIcon(icon);
//        la.setSize(icon.getIconWidth(), icon.getIconHeight());
        la.setSize(200, 100);
        la.setLocation(100, 100);
        add(la);

        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex05();

    }

    @Override
    public void mouseDragged(MouseEvent e) {
        System.out.println("call mouseDragged");
    }

    @Override
    public void mouseMoved(MouseEvent e) {
//        System.out.println(e.getX() + ", " + e.getY());        
        int x = e.getX();
        int y = e.getY();
        la.setLocation(x-50, y-50);
    }
}

키보드 클릭시 이벤트 발생

public class Ex06 extends Frame implements KeyListener{
    TextField tf;

    public Ex06() {
        setLayout(new FlowLayout());
        tf = new TextField(15);
        tf.addKeyListener(this);
        add(tf);



        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex06();
    }

    @Override
    public void keyTyped(KeyEvent e) {
        // 문자(폰트)를 타입했을때만 호출됨
        System.out.print("call keyTyped:" + e.getKeyCode() + ", " + e.getKeyChar());
        System.out.println(" => " + tf.getText()); // ab
    }

    @Override
    public void keyPressed(KeyEvent e) {
        // 모든 키보드를 눌렀을때 호출됨 
        System.out.print("call keyPressed:" + e.getKeyCode() + ", " + e.getKeyChar());
        System.out.println(" => " + tf.getText()); // ab
    }

    @Override
    public void keyReleased(KeyEvent e) {
        System.out.print("call keyReleased");
        System.out.println(" => " + tf.getText()); // abc
    }
}

public class Ex07 extends Frame implements KeyListener{
    JLabel la;

    public Ex07() {
        setLayout(new FlowLayout());

//        TextField tf = new TextField();
//        Button btn = new Button("new Button");
        la = new JLabel("new Button");
        la.setSize(50, 50);
        la.setLocation(100, 100);

        this.addKeyListener(this);
//        add(tf);
//        add(btn);
        add(la);


        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex07();
    }

    @Override
    public void keyTyped(KeyEvent e) {

    }

    @Override
    public void keyPressed(KeyEvent e) {

    }

    @Override
    public void keyReleased(KeyEvent e) {
//        System.out.println("call" + e.getKeyCode());
        if(e.getKeyCode() == 37) {
            if(la.getX()-100 >= 0+10)
                la.setLocation(la.getX()-100, la.getY());
        }
        if(e.getKeyCode() == 39) {
            if(la.getX()+100 <= this.getWidth()-10)
                la.setLocation(la.getX()+100, la.getY());
        }
        if(e.getKeyCode() == 38) {
            if(la.getY()-100 >= 0+5)
                la.setLocation(la.getX(), la.getY()-100);
        }
        if(e.getKeyCode() == 40) {
            if(la.getY()+100 <= this.getHeight()-5)
                la.setLocation(la.getX(), la.getY()+100);
        }
    }
}

TextListener

public class Ex08 extends Frame implements TextListener{

    public Ex08() {
        setLayout(new FlowLayout());

        TextField tf = new TextField(15);
        tf.addTextListener(this);

        add(tf);


        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex08();
    }

    @Override
    public void textValueChanged(TextEvent e) {
        TextField tf = (TextField)e.getSource();
        System.out.println(tf.getText());
    }
}

ItemListener

public class Ex09 extends Frame implements ItemListener{

    public Ex09() {
        setLayout(new FlowLayout());

        Choice list1 = new Choice();
        list1.setFont(new Font("", 0, 15));
        list1.add("item1");
        list1.add("item2");
        list1.add("item3");
        list1.add("item4");
//        list1.addItemListener(this);

        List list2 = new List(4, true);
        list2.setFont(new Font("", 0, 15));
        list2.add("item1");
        list2.add("item2");
        list2.add("item3");
        list2.add("item4");
        list2.add("item5");
        list2.addItemListener(this);

        add(list1);
        add(list2);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex09();
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        System.out.println(e.getItem());
        System.out.println(e.getSource());
        System.out.println(e.getStateChange());
        Object[] arr = e.getItemSelectable().getSelectedObjects();
        System.out.println(java.util.Arrays.deepToString(arr));
    }
}

ActionListener

• 컴포넌트 고유의 이벤트를 실행한다.

public class Ex10 extends Frame implements ActionListener{

    public Ex10() {
        setLayout(new FlowLayout());

        Button btn = new Button("Button");
//        btn.addActionListener(this);

        TextField tf = new TextField(15);
        tf.addActionListener(this); // enter를 쳤을때 호출된다.

        add(btn);
        add(tf);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex10();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("call actionPerformed");
    }
}

두개 이상의 ActionListener 사용하기

public class Ex10 extends Frame implements ActionListener{
    Button btn;
    TextField tf;

    public Ex10() {
        setLayout(new FlowLayout());

        btn = new Button("Button");
        btn.addActionListener(this);

        tf = new TextField(15);
        tf.setEchoChar('*');
        tf.addActionListener(this); // enter를 쳤을때 호출된다.

        add(btn);
        add(tf);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex10();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == tf)
            System.out.println(e.getActionCommand());
        if(e.getSource() == btn)
            System.out.println("button clicked");

    }
}

public class Ex10 extends Frame implements ActionListener{
    Button btn;
    TextField tf;

    class BtnEvent implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("button clicked");
        }

    }

    public Ex10() {
        setLayout(new FlowLayout());

        btn = new Button("Button");
        btn.addActionListener(new BtnEvent());

        tf = new TextField(15);
        tf.setEchoChar('*');
        tf.addActionListener(this); // enter를 쳤을때 호출된다.

        add(btn);
        add(tf);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex10();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println(e.getActionCommand());

    }
}

혹은

public class Ex10 extends Frame implements ActionListener{
    Button btn;
    TextField tf;


    public Ex10() {
        setLayout(new FlowLayout());

        btn = new Button("Button");
//        btn.addActionListener(new ActionListener(){
//
//            @Override
//            public void actionPerformed(ActionEvent e) {
//                System.out.println("button clicked");
//            }
//            
//        });

        btn.addActionListener(e -> System.out.println("클릭"));

        tf = new TextField(15);
        tf.setEchoChar('*');
        tf.addActionListener(this); // enter를 쳤을때 호출된다.

        add(btn);
        add(tf);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex10();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println(e.getActionCommand());

    }
}

입력된 TextField 문자를 안보이게 하는 법

public class Ex10 extends Frame implements ActionListener{

    public Ex10() {
        setLayout(new FlowLayout());

        TextField tf = new TextField(15);
        tf.setEchoChar('*');
        tf.addActionListener(this); // enter를 쳤을때 호출된다.

        add(tf);
        setBounds(0, 200, 500, 600);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Ex10();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println(e.getActionCommand());
    }
}

Anonymous class를 이용해 WindowListener를 implement 하지 않고 windowCLosing 적용하기

class Temp implements WindowListener{
// @Override methods 
}
public class Ex10 extends Frame implements ActionListener{
    this.addWindowListener(new Temp() {
        @Override
        public void windowClosing(WindowEvent e) {
            dispose();
        }
    });

public class Ex10 extends Frame implements ActionListener{
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                dispose();
            }
        });

학생성적관리프로그램

package com.Day13;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Label;
import java.util.List;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

public class Ex13_answer implements ActionListener {
    List<String[]> data = new ArrayList<>();
    static TextField[] adds;
    static Panel center = new Panel();
    static Frame f;
    static Font ft;

    public static void main(String[] args) {
        f = new Frame("학생성적관리프로그램 (ver 0.9.0)");
        f.setLayout(new BorderLayout());

        Panel top = new Panel();
        top.setLayout(new FlowLayout());
        center.setLayout(new FlowLayout());
        ft = new Font("", Font.BOLD, 20);

        adds = new TextField[5];
        Label[] las = {
                new Label("ID"),
                new Label("Name"),
                new Label("Kor"),
                new Label("Eng"),
                new Label("Math"),
        };
        for(int i = 0; i < adds.length; i++) {
            adds[i] = new TextField(8);
            adds[i].setFont(ft);
            las[i].setFont(ft);
            top.add(las[i]);
            top.add(adds[i]);
        }
        Button addBtn = new Button("Insert");
        addBtn.addActionListener(new Ex13_answer());
        addBtn.setFont(ft);
        top.add(addBtn);

        f.add(top, BorderLayout.NORTH);
        f.add(center, BorderLayout.CENTER);


        java.awt.Toolkit kit = Toolkit.getDefaultToolkit();
        Dimension screen = kit.getScreenSize();
        int w, h;
        w = screen.width/2;
        h = screen.height/2;
        f.setBounds(w, h, 1000, 600);
        f.setVisible(true);
    }


    @Override
    public void actionPerformed(ActionEvent e) {
        String[] row = new String[] {
                adds[0].getText(),
                adds[1].getText(),
                adds[2].getText(),
                adds[3].getText(),
                adds[4].getText(),
        };
        data.add(row);
        centerValid();

//        TextField[] col = new TextField[5];
//        col[0] = new TextField(adds[0].getText(), 8);
//        col[1] = new TextField(adds[1].getText(), 8);
//        col[2] = new TextField(adds[2].getText(), 8);
//        col[3] = new TextField(adds[3].getText(), 8);
//        col[4] = new TextField(adds[4].getText(), 8);
//        
//        Panel row = new Panel();
//        for(int i = 0; i < col.length; i++) {
//            row.add(col[i]);
//        }
//        Button edit = new Button("Edit");
//        Button del = new Button("Delete");
//        row.add(edit);
//        row.add(del);
//        center.add(row);
//        for(int i = 0; i < adds.length; i++) {
//            adds[i].setText("");
//        }
//        f.validate();
    }


    void centerValid() {
        center.removeAll();
        Panel group1 = new Panel();
        group1.add(new Label("ID\t\t\t\t"));
        group1.add(new Label("Name\t\t\t\t"));
        group1.add(new Label("Kor\t\t\t\t"));
        group1.add(new Label("Eng\t\t\t\t"));
        group1.add(new Label("Math\t\t\t\t\t\t\t"));
        center.add(group1);
        group1.setFont(ft);
        for(int i = 0; i < data.size(); i++) {
            String[] row = data.get(i);
            Panel group = new Panel();
            group.add(new TextField(row[0], 8));
            group.add(new TextField(row[1], 8));
            group.add(new TextField(row[2], 8));
            group.add(new TextField(row[3], 8));
            group.add(new TextField(row[4], 8));
            Button btn1 = new Button("Edit");
            Button btn2 = new Button("Delete");
            group.add(btn1);
            group.add(btn2);
            group.setFont(ft);
            center.add(group);
        }
        for(int i = 0; i < adds.length; i++) {
            adds[i].setText("");
        }
        f.validate();
    }

}