רישום התוכנה SwingEvent08
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/*File SwingEvent08.java Copyright 1998, R.G.Baldwin
Rev 05/09/98
This is a Swing version of the program named Event08.
The purpose of this program is to illustrate that in many
respects, programming with Swing components is no different
from programming with AWT components.
Conversion of this program from AWT to Swing involved
nothing more complex than using the search and replace
feature of an editor to replace all instances of Frame
with JFrame and to import the swing package.
Illustrates the use of Event Sources, Event Listeners, and
Adapters in the Delegation Event Model for Swing
components.
Briefly, this application instantiates an object which
creates a user interface consisting of a simple JFrame
object. This object is an Event Source which notifies two
different Event Listener objects of Window events.
One of the Listener objects implements the WindowListener
interface and overrides all of the methods declared in
that interface.
The other Listener object extends the Adapter class named
WindowAdapter. The purpose of Adapter classes is to
implement the Listener interfaces and to define all of
the methods with empty methods. Classes which extend the
Adapter classes can then selectively override only those
methods of interest. This Listener object overrides only
two of the methods.
Note that this application does not terminate and return
control to the operating system. You must forcefully
terminate it.
Tested using JDK 1.1.6 and Swing 1.0.1 under Win95.
When executed, this application places a simple empty
JFrame object on the screen.
Starting the program produces screen output similar to
the following:
WProc1 windowActivated test msg
Wproc1 windowOpened test msg
Pressing the minimize button on the JFrame produces the
output similar to the following:
WProc1 windowIconified test msg
******** WProc2 windowIconified test msg
WProc1 windowDeactivated test msg
Restoring the JFrame after minimization produces the
output similar to the following:
WProc1 windowActivated test msg
WProc1 windowDeiconified test msg
******** WProc2 windowDeiconified test msg
WProc1 windowActivated test msg
Closing the JFrame by pressing the X-icon in the upper
right of the JFrame produces output similar to the
following:
WProc1 windowClosing test msg
WProc1 windowDeactivated test msg
WProc1 windowClosed test msg
**********************************************************/
import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;
public class SwingEvent08 {
public static void main(String[] args){
GUI gui = new GUI();//instantiate a GUInterface object
}//end main
}//end class SwingEvent08
//=======================================================//
//The following class is used to instantiate a user
// interface object, to instantiate two Listener objects,
// and to register those two objects for notification
// whenever a Window event occurs.
class GUI{
public GUI(){//constructor
//Create a new JFrame object
JFrame displayWindow = new JFrame();
displayWindow.setSize(300,200);
displayWindow.setTitle("Copyright 1998, R.G.Baldwin");
//Instantiate two Listener objects which will process
// Window events
WProc1 winProcCmd1 = new WProc1(displayWindow);
WProc2 winProcCmd2 = new WProc2();
//Register the Listener objects for notification of
// Window events. This object is the Event Source.
displayWindow.addWindowListener(winProcCmd1);
displayWindow.addWindowListener(winProcCmd2);
//windowActivated and windowOpened test messages
// are produced here
displayWindow.setVisible(true);
}//end constructor
}//end class GUI definition
//=======================================================//
//The following two classes can be used to instantiate
// Listener objects. Note that this class implements the
// WindowListener interface. This requires that all the
// methods declared in the interface be overridden in this
// class. This class overrides all of the methods and
// displays a descriptive message whenever one of the
// methods is invoked.
class WProc1 implements WindowListener{
//used to save a reference to the JFrame object
JFrame displayWindowRef;
WProc1(JFrame windowIn){//constructor
// save ref to JFrame object
this.displayWindowRef = windowIn;
}//end constructor
public void windowClosed(WindowEvent e){
System.out.println("WProc1 windowClosed test msg");
}//end windowClosed()
public void windowIconified(WindowEvent e){
System.out.println("WProc1 windowIconified test msg");
}//end windowIconified()
public void windowOpened(WindowEvent e){
System.out.println("WProc1 windowOpened test msg");
}//end windowOpened()
public void windowClosing(WindowEvent e){
System.out.println("WProc1 windowClosing test msg");
displayWindowRef.dispose();//generate WindowClosed
}//end windowClosing()
public void windowDeiconified(WindowEvent e){
System.out.println(
"WProc1 windowDeiconified test msg");
}//end windowDeiconified()
public void windowActivated(WindowEvent e){
System.out.println("WProc1 windowActivated test msg");
}//end windowActivated()
public void windowDeactivated(WindowEvent e){
System.out.println(
"WProc1 windowDeactivated test msg");
}//end windowDeactivated()
}//end class WProc1
//=======================================================//
//This and the previous class can be used to instantiate
// Listener objects. Note that this class extends an
// Adapter class which can be used to avoid the
// requirement to define all of the methods of the
// actual Listener class named WindowListener. This class
// overrides only two of the methods declared in the
// interface. It displays a message whenever one of the
// methods is invoked.
class WProc2 extends WindowAdapter{
public void windowIconified(WindowEvent e){
System.out.println(
"******** WProc2 windowIconified test msg");
}//end windowIconified()
public void windowDeiconified(WindowEvent e){
System.out.println(
"******** WProc2 windowDeiconified test msg");
}//end windowDeiconified()
}//end class WProc2 |
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