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

2 AWT Event Model  Java 의 Event Model 1.Event : 사용자가 Program 에 가한 행동 2.Event Source : Event 가 일어난 근원 3.Event Handler : 발생된 Event object 를 받아 적당한 행동을 취 하는 method

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(“ 버튼 1"); //Button 생성  b.addActionListener(new ButtonHandler()); //addActionListener() method 는 이 Button 에 Event Handler 를 지정  f.add(b, "Center");  f.pack();  f.setVisible(true);  }

4 Event Handler(2) 1.import java.awt.event.*; 2. public class ButtonHandler implements ActionListener { // interface 안에 있는 특정한 abstract method 를 구현 3. public void actionPerformed(ActionEvent e) { 4. System.out.println("Button 을 클릭하셨네요."); 5. System.out.println("Button 에 적힌 글은 " + e.getActionCommand()); 6. } 7.} – Event Handler 를 만들 때는 반드시 적당한 Event Handler Interface 를 implements 해야 한다 – addXXXListener() 의 argument 로 올 Event Handler class 는 반드시 XXXListener interface 를 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); ////////////////////////////// swing 에서는 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; ///////// swing 에서는 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 Label 입니다."); 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(); }