10 awt event model

Jun 9, 2010Download as pptx, pdf

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This document discusses event handling in Java AWT. It defines events, event sources, and event handlers. It provides examples of adding listeners to handle different event types, such as clicking a button, closing a window, and mouse movement. Code examples are given to demonstrate implementing event handlers for these scenarios by adding listeners to the appropriate event sources and handling the events in the listener methods. The document also discusses using multiple listeners on a single event source to handle different event types.

10 AWT Event ModelHUREE University ICTInstructor: M.J LEE

ContentsEventActions like clicking button with a mouse, pushing down a key on keyboardEvent SourceSources that cause events such as a button, a keyEvent HandlerMethods that get an occurred event, then handle proper actions2

How to handle event?When something happen(event occurs), this method handle the event.3import java.awt.*;public class ButtonTest { public static void main(String args[]) { Frame f = new Frame("Button Test"); Button b = new Button(“Click!");b.addActionListener(new ButtonHandler());f.add(b);f.pack();f.setVisible(true); }}

How to handle event?When something happens(a event occurs), this method handle the event.4import java.awt.event.*;public class ButtonHandlerimplements ActionListener{ public void actionPerformed(ActionEvent e) {System.out.println(“button pushed!");System.out.println(e.getActionCommand()); }}

ExamplesWe want to close the window when pushing down a close buttonHow to implement? Which method do we have to use?Find out event sourceApply addXXXListener() on the event source, define event handlerImplement event handler7

ExamplesFind out event source  window What is the interface related with window? WindowListenerMatch the event source with event handlerImplement WindowHandler()8f.addWindowListener(new WindowHandler());

Examples9public class WindowHandlerimplementsWindowListener{ public void windowClosing(WindowEvent e) {System.exit(0); }windowOpened(WindowEvent e) { }windowIconified(WindowEvent e) { }windowDeiconified(WindowEvent e) { }windowClosed(WindowEvent e) { }windowActivated(WindowEvent e) { }windowDeactivated(WindowEvent e) { }}

10public class ButtonTest2 implements WindowListener { private Frame f; private Button b; public ButtonTest2(String str) { f = new Frame(str);f.addWindowListener(this); b = new Button("Click!!");b.addActionListener(new ButtonHandler());f.add(b, "Center");f.pack();f.setVisible(true); } public static void main(String args[]) { ButtonTest2 fa= new ButtonTest2("Button Test"); } public void windowClosing(WindowEvent e) {f.setVisible(false); f.dispose(); System.exit(0); } public void windowOpened(WindowEvent e) { } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public void windowClosed(WindowEvent e) { } public void windowActivated(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { }}

11public class ButtonTest extends Frame implements WindowListener {public ButtonTest(String str) {super(str);addWindowListener(this);}public static void main(String args[]) {ButtonTestbt= new ButtonTest("Button Test");Button b = new Button("Click!!");b.addActionListener(new ButtonHandler());bt.add(b, "Center");bt.pack();bt.setVisible(true);}public void windowClosing(WindowEvent e) {setVisible(false); dispose(); System.exit(0); }public void windowOpened(WindowEvent e) { }public void windowIconified(WindowEvent e) { }public void windowDeiconified(WindowEvent e) { }public void windowClosed(WindowEvent e) { }public void windowActivated(WindowEvent e) { }public void windowDeactivated(WindowEvent e) { }}import java.awt.event.*;public class ButtonHandler implements ActionListener{public void actionPerformed(ActionEvent e) {System.out.println("button pushed!");System.out.println(e.getActionCommand());}}

Multiple Listener12We can add multiple event handlers on the one event source

MouseMotionListener / MouseListener interfaceDefine a event sourceAdd each event handler on the event sourceImplement two Event Handler

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Event handling in Java uses the delegation event model. This model defines key participants in event handling - the source that generates an event, listener objects that process events, and an event object that provides event information. When an event occurs, the event object is passed to the registered listener's callback method to be processed. Common AWT events include action, item, mouse, key, text, and window events, which are represented by classes that extend the EventObject class. Listeners implement interfaces like ActionListener to receive and handle specific event types.

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The document outlines event handling in Java, discussing how events are generated by user interactions with components and how they are processed through listeners. It describes the delegation event model, various event classes and listeners, and provides examples of implementing event listeners using both standard and adapter classes. Additional details include the architecture of event classes, the use of nested and anonymous inner classes for event handling, and the organization of event-related functionalities in the Java AWT framework.

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The document discusses event handling in Java, focusing on the delegation event model where events are generated by components in response to user actions and processed by listeners implementing specific interfaces. It details the responsibilities of sources and listeners in the event handling process, various event classes, and how to utilize listener interfaces like ActionListener and MouseListener. Additionally, it introduces adapter classes that simplify the implementation of listener interfaces by allowing users to override only the methods of interest.

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10 awt event model

1. 10 AWT Event ModelHUREE University ICTInstructor: M.J LEE

2. ContentsEventActions like clicking button with a mouse, pushing down a key on keyboardEvent SourceSources that cause events such as a button, a keyEvent HandlerMethods that get an occurred event, then handle proper actions2

3. How to handle event?When something happen(event occurs), this method handle the event.3import java.awt.*;public class ButtonTest { public static void main(String args[]) { Frame f = new Frame("Button Test"); Button b = new Button(“Click!");b.addActionListener(new ButtonHandler());f.add(b);f.pack();f.setVisible(true); }}

4. How to handle event?When something happens(a event occurs), this method handle the event.4import java.awt.event.*;public class ButtonHandlerimplements ActionListener{ public void actionPerformed(ActionEvent e) {System.out.println(“button pushed!");System.out.println(e.getActionCommand()); }}

5. Method Categories and Interfaces5

6. 6

7. ExamplesWe want to close the window when pushing down a close buttonHow to implement? Which method do we have to use?Find out event sourceApply addXXXListener() on the event source, define event handlerImplement event handler7

8. ExamplesFind out event source  window What is the interface related with window? WindowListenerMatch the event source with event handlerImplement WindowHandler()8f.addWindowListener(new WindowHandler());

9. Examples9public class WindowHandlerimplementsWindowListener{ public void windowClosing(WindowEvent e) {System.exit(0); }windowOpened(WindowEvent e) { }windowIconified(WindowEvent e) { }windowDeiconified(WindowEvent e) { }windowClosed(WindowEvent e) { }windowActivated(WindowEvent e) { }windowDeactivated(WindowEvent e) { }}

10. 10public class ButtonTest2 implements WindowListener { private Frame f; private Button b; public ButtonTest2(String str) { f = new Frame(str);f.addWindowListener(this); b = new Button("Click!!");b.addActionListener(new ButtonHandler());f.add(b, "Center");f.pack();f.setVisible(true); } public static void main(String args[]) { ButtonTest2 fa= new ButtonTest2("Button Test"); } public void windowClosing(WindowEvent e) {f.setVisible(false); f.dispose(); System.exit(0); } public void windowOpened(WindowEvent e) { } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public void windowClosed(WindowEvent e) { } public void windowActivated(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { }}

11. 11public class ButtonTest extends Frame implements WindowListener {public ButtonTest(String str) {super(str);addWindowListener(this);}public static void main(String args[]) {ButtonTestbt= new ButtonTest("Button Test");Button b = new Button("Click!!");b.addActionListener(new ButtonHandler());bt.add(b, "Center");bt.pack();bt.setVisible(true);}public void windowClosing(WindowEvent e) {setVisible(false); dispose(); System.exit(0); }public void windowOpened(WindowEvent e) { }public void windowIconified(WindowEvent e) { }public void windowDeiconified(WindowEvent e) { }public void windowClosed(WindowEvent e) { }public void windowActivated(WindowEvent e) { }public void windowDeactivated(WindowEvent e) { }}import java.awt.event.*;public class ButtonHandler implements ActionListener{public void actionPerformed(ActionEvent e) {System.out.println("button pushed!");System.out.println(e.getActionCommand());}}

12. Multiple Listener12We can add multiple event handlers on the one event source

13. Sensing moving, and being clocked.

14. MouseMotionListener / MouseListener interfaceDefine a event sourceAdd each event handler on the event sourceImplement two Event Handler

15. public class TwoListen implements MouseMotionListener, MouseListener { private Frame f; private TextFieldtf;public static void main(String args[]) { TwoListen two = new TwoListen(); two.go(); } public void go() { f = new Frame("Two listeners example"); f.add (new Label ("Click and drag the mouse"), BorderLayout.NORTH); tf = new TextField (30);f.add (tf, BorderLayout.SOUTH);f.addMouseMotionListener(this);f.addMouseListener (this);f.setSize(300, 200);f.setVisible(true); }... ...1Event sourceAdd listeners2

16. ... ...public void mouseDragged (MouseEvent e) { String s = "Mouse dragging: X=“+e.getX()+" Y=“+ e.getY(); tf.setText (s); } public void mouseEntered (MouseEvent e) { String s = "The mouse entered"; tf.setText (s);} public void mouseExited (MouseEvent e) { String s = "The mouse has left the building"; tf.setText (s); } public void mouseMoved (MouseEvent e) { }public void mousePressed (MouseEvent e) { }public void mouseClicked (MouseEvent e) { }public void mouseReleased (MouseEvent e) { } } Implement all abstract methods in Listeners3

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10 awt event model

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