GUI 프로그래밍과 AWT(2)

1. GUI 프로그래밍과 AWT(2) 컴퓨터 공학실험(I) 인공지능 연구실

2. AWT Event Model • Java의 Event Model • Event : 사용자가 Program에 가한 행동 • Event Source : Event가 일어난 근원 • Event Handler : 발생된 Event object를 받아 적당한 행동을 취 하는method

3. Event Handler(1) • import java.awt.*; • public class ButtonTest { • public static void main(String args[]) { •         Frame f = new Frame("Button Test"); //Frame 생성 • Button b = new Button(“버튼1"); //Button 생성 • b.addActionListener(new ButtonHandler()); //addActionListener() method는 이 Button에 Event Handler를 지정 • f.add(b, "Center"); •         f.pack(); •         f.setVisible(true); • } • } 

4. Event Handler(2) • import java.awt.event.*; •  public class ButtonHandler implements ActionListener { // interface 안에 있는 특정한 abstract method를 구현 • public void actionPerformed(ActionEvent e) { •         System.out.println("Button을 클릭하셨네요."); •         System.out.println("Button에 적힌 글은 " + e.getActionCommand()); •   } • } • Event Handler를 만들 때는 반드시 적당한 Event Handler Interface를 implements해야 한다 • addXXXListener()의 argument로 올 Event Handler class는 반드시 XXXListener interface를 implements 해야 한다.

5. Method Categories and Interfaces

6. AWT Component • Button • Checkbox • CheckboxGroup • Choice • Canvas • Label • TextField • TextArea • List • Dialog • ScrollPane • Menu

7. AWT Component(1) - Button import java.awt.*; import java.awt.event.*; public class ButtonTest { Frame f ; Button b;  public static void main(String args[]) {        ButtonTest bt = new ButtonTest();         bt.go();  }  public void go() {         f = new Frame("Button Test");         b = new Button(“확인");     b.addActionListener(new ButtonHandler());  f.add(b, "Center");        f.pack();         f.setVisible(true);    }    class ButtonHandler implements ActionListener {         public void actionPerformed(ActionEvent ae) {                 if (ae.getActionCommand().equals("확인")) {….} // if (ae.getSource()==b){….}    }    } }

8. AWT Component(2) – Check Box public class SampleCheckbox implements ItemListener {    private Frame f;    private Checkbox one, two;    public void go() {         f = new Frame("Sample Checkbox"); one = new Checkbox(“AI", true);         two = new Checkbox(“Lab", false);          one.addItemListener(this);         two.addItemListener(this);         …….. } public void itemStateChanged(ItemEvent ie) {         String state = "해제";         if (ie.getStateChange() == ItemEvent.SELECTED) {   state = "선택";    }         System.out.println (ie.getItem() + " " + state);    }

9. AWT Component(3) – Radio Button public class TestCheckboxGroup implements ItemListener {    private Frame f;   private Checkbox one, two, three;    private CheckboxGroup cbg;    public void go() {         f = new Frame("Sample Checkbox");      cbg = new CheckboxGroup();         one = new Checkbox("대", cbg, true);    two = new Checkbox("중", cbg, false);         three = new Checkbox("소", cbg, false); ////////////////////////////// swing에서는 JRadioButton         one.addItemListener(this); two.addItemListener(this);  three.addItemListener(this); ……… } public void itemStateChanged(ItemEvent ev) {         String state = null;         if (ev.getStateChange() == ItemEvent.SELECTED) {                 state = "가 선택됨";                 System.out.println (ev.getItem() + " " + state);       } }

10. AWT Component(3) – Combo Box public class SampleChoice implements ItemListener {    private Frame f;    private Choice choice; ///////// swing에서는 JComboBox    public void go() {         f = new Frame("Choice 연습");        choice = new Choice();         choice.addItem(“AI"); choice.addItem(“Lab"); choice.addItem("인공지능연구실");         choice.addItemListener(this); ……… } public void itemStateChanged(ItemEvent ev) {         String state = "deselected";         if (ev.getStateChange() == ItemEvent.SELECTED) {   state = "selected";    }         System.out.println (ev.getItem() + " " + state);    }

11. AWT Component(3) – Canvas public class CanvasTest extends Canvas implements KeyListener{    int x=10, y=10, xh=10, yh=10;    public void paint(Graphics g) {  g.drawRect(x, y, xh, yh);    }    public void keyTyped(KeyEvent ev) {         if (ev.getKeyChar() == 'j') {  x -= 1;   x -= 1;   } else if (ev.getKeyChar() == 'l') {  x += 1;   x += 1; }         else if (ev.getKeyChar() == 'k') {  y += 1;   y += 1; }         else if (ev.getKeyChar() == 'i') {  y -= 1;  y -= 1;  }       repaint();    }    public void keyPressed(KeyEvent ev) { }    public void keyReleased(KeyEvent ev) { }    public static void main(String args[]) {         Frame f = new Frame("Canvas");         CanvasTest mc = new CanvasTest();         mc.setSize(150, 150);         f.add(mc, BorderLayout.CENTER);         mc.requestFocus();         mc.addKeyListener(mc);         f.pack();         f.setVisible(true);    } }

12. AWT Component(3) – Label import java.awt.*; public class LabelTest{ public static void main(String args[]) {          Frame f = new Frame("이게 Label입니다.");   Label lb = new Label("사원정보");          f.add(lb);          f.pack();          f.setVisible(true); } }

13. AWT Component(3) – Text Field import java.awt.*; import java.awt.event.*; public class TextFieldTest { private Frame f; private TextField tf; public void go() {          f = new Frame("TextField Test");       tf = new TextField(30);       tf.setEchoChar('*');          f.add(tf, BorderLayout.CENTER);          f.pack();          f.setVisible(true); } public static void main (String args[]) {          TextFieldTest tft = new TextFieldTest();          tft.go(); } }

14. AWT Component(3) – Text Area import java.awt.*; import java.awt.event.*; public class TextAreaTest implements ActionListener { private Frame f; private TextArea ta, tac; private Button ok; public void go() {         f = new Frame("TextArea"); ta = new TextArea("Hello!", 4, 30);   tac = new TextArea(4, 30); ok = new Button("복사");         f.add(ta, BorderLayout.NORTH);       f.add(ok, BorderLayout.CENTER);         f.add(tac, BorderLayout.SOUTH);  ok.addActionListener(this);      f.pack();         f.setVisible(true); } public void actionPerformed(ActionEvent av) {          String text = ta.getText();        tac.setText(text); } public static void main (String args[]) {         TextAreaTest tt = new TextAreaTest();         tt.go(); } }

15. AWT Component(3) – List import java.awt.*; import java.awt.event.*;    public class TestList implements ActionListener {    private Frame f;   private List list;    private Button b;     public void go() {          f = new Frame(“List"); list = new List(4, true); list.add(“AI");       list.add(“Lab");       list.add("인공지능연구실"); b = new Button("눌러~눌러~"); f.add(list, BorderLayout.CENTER);     f.add(b, BorderLayout.SOUTH);          b.addActionListener(this);      f.pack();         f.setVisible(true);     }    public void actionPerformed(ActionEvent ae) {          String [] selectedItems;         selectedItems = list.getSelectedItems(); for (int i = 0; i < selectedItems.length; i++) System.out.println(selectedItems[i]);     }     public static void main (String args[]) {          TestList ml = new TestList();         ml.go();    } }

16. AWT Component(3) – Dialog Box import java.awt.*; import java.awt.event.*; public class TestDialog implements ActionListener { private Frame f; private FileDialog fd; private Dialog dl; private Button b1, b2, close; public void go() {          f = new Frame("FileDialog");        fd = new FileDialog(f, "파일 열기");// Dialog 만들기 dl = new Dialog(f, "dialog", true);   dl.add(new Label("여러분 안녕?"), BorderLayout.NORTH);          close = new Button("닫 기");   close.addActionListener(this);  dl.add(close, BorderLayout.CENTER); dl.pack(); b1 = new Button("FileDialog");  b2 = new Button("Dialog"); b1.addActionListener(this);          b2.addActionListener(this);         f.add(b1, BorderLayout.CENTER);         f.add(b2, BorderLayout.EAST);          f.pack();         f.setVisible(true); } public void actionPerformed( ActionEvent ae) {          String buttonPressed = ae.getActionCommand();         if (buttonPressed.equals("FileDialog")) {             fd.setVisible(true);       } else if (buttonPressed.equals("Dialog")) {            dl.setVisible(true);       } else if (buttonPressed.equals("닫 기")) { dl.setVisible(false);    } else {    fd.setVisible(false);    } }  public static void main (String args[]) {          TestDialog TestDialog = new TestDialog();     TestDialog.go(); } }

17. AWT Component(3) – ScrollPane import java.awt.*;    public class TestScrollPane {     private Frame f;  private Image img; private Button b1, b2, b3, b4, b5, b6;   private Button b7, b8, b9, b10, b11, b12;     private Panel p; private ScrollPane sp; public void go() {          f = new Frame("Sample ScrollPane"); p = new Panel(); sp = new ScrollPane();  p.setLayout(new GridLayout(4,3)); b1 = new Button("사람 1"); b2 = new Button("사람 2"); b3 = new Button("사람 3"); b4 = new Button("사람 4");          b5 = new Button("사람 5"); b6 = new Button("사람 6"); b7 = new Button("사람 7"); b8 = new Button("사람 8");          b9 = new Button("사람 9"); b10 = new Button("사람 10");b11 = new Button("사람 11");b12 = new Button("사람 12");          p.add(b1); p.add(b2); p.add(b3); p.add(b4); p.add(b5); p.add(b6); p.add(b7); p.add(b8); p.add(b9); p.add(b10); p.add(b11); p.add(b12);    sp.add(p);     f.add(sp, BorderLayout.CENTER);     f.setSize(100,100);        f.setVisible(true);     }     public static void main (String args[]) {          TestScrollPane TestScrollPane = new TestScrollPane();          TestScrollPane.go();   } }