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/*File Event11.java Copyright 1997, R.G.Baldwin
This program is designed to be compiled and run under
JDK 1.1
The program illustrates the sharing of a single listener
object between two different visual components of
different types.
The program detects mouse events occurring on either a
visual Frame object or on a visual Window object. It
distinguishes between the two objects on the basis of the
component name, and displays a message indicating which
object generated the event.
Clicking inside the Frame object but outside the Window
object produces the following message:
Got mousePressed event from Frame object
Clicking inside the Window object produces the following
message:
Got mousePressed event from Window object
Closing the Frame object produces the following message
and terminates the program:
Got windowClosing event from Frame object
These results were produced using JDK 1.1.3, running under
Windows 95.
**********************************************************/
import java.awt.*;
import java.awt.event.*;
public class Event11 {
public static void main(String[] args){
GUI gui = new GUI();//instantiate a GUI
}//end main
}//end class Event11
//=======================================================//
//The following class is used to instantiate a graphical
// user interface object.
class GUI {
public GUI(){//constructor
//Create a visual Frame object and name it Frame
Frame myFrame = new Frame();
myFrame.setSize(200,300);
myFrame.setTitle("Copyright 1997, R.G.Baldwin");
myFrame.setName("Frame");
myFrame.setVisible(true);
//Create a visual Window object inside the Frame
// object and name it Window
Window myWindow = new Window(myFrame);
myWindow.setSize(100,100);
myWindow.setName("Window");
myWindow.setVisible(true);
//Instantiate and register a Listener object which
// will process mouse events on either the Frame
// object or the Window object.
MouseProc mouseProcCmd = new MouseProc();
myFrame.addMouseListener(mouseProcCmd);
myWindow.addMouseListener(mouseProcCmd);
//Instantiate and register a Listener object which
// will display a message and terminate the program
// when the user closes the Frame object
WProc1 winProcCmd1 = new WProc1();
myFrame.addWindowListener(winProcCmd1);
}//end constructor
}//end class GUI definition
//=======================================================//
//This listener class monitors for mouse presses and
// displays a message when a mousEpressed() event occurs on
// either the Frame object or the Window object. The
// message identifies which visual object generated
// the event. The listener object distinguishes between
// the two visual objects on the basis of their component
// names.
class MouseProc extends MouseAdapter{
//Override the mousePressed() method to respond whenever
// the mouse is pressed on one of the visual objects.
public void mousePressed(MouseEvent e){
if( e.getComponent().getName().compareTo("Frame")
== 0 ){
System.out.println(
"Got mousePressed event from Frame object");
}//end if
if( e.getComponent().getName().compareTo("Window")
== 0 ){
System.out.println(
"Got mousePressed event from Window object");
}//end if
}//end mousePressed()
}//end class MouseProc
//=======================================================//
//The following listener is used to display a message and
// terminate the program when the user closes the Frame
// object.
class WProc1 extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.out.println(
"Got windowClosing event from Frame object");
System.exit(0);
}//end windowClosing()
}//end class WProc1
//=======================================================// |
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