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/*File SwingEvent10.java Copyright 1998, R.G.Baldwin
Illustrates use of getContentPane() to add a JButton to
a JFrame.
Illustrates use of AncestorListener on a JButton.
Running the program and moving the resulting JFrame on the
screen produced the following output. Note that line breaks
were manually added to this presentation to make the lines
fit in this format. Note that these outputs don't seem to
provide a good match for the descriptions and names of the
methods in the JavaSoft documentation.
Make JFrame visible
ancestorAdded method invoked
Event source: com.sun.java.swing.JButton[,0,0,0x0,
invalid,layout=com.sun.java.swing.OverlayLayout]
Ancestor: com.sun.java.swing.JButton[,0,0,0x0,
invalid,layout=com.sun.java.swing.OverlayLayout]
Parent: com.sun.java.swing.JPanel[null.contentPane,0,0,0x0,
invalid,layout=com.sun.java.swing.JRootPane$1]
Component: com.sun.java.swing.JButton[,0,0,0x0,
invalid,layout=com.sun.java.swing.OverlayLayout]
ID value: 1
ancestorMoved method
ancestorMoved method
Tested using JDK 1.1.6 and Swing 1.0.1 under Win95.
**********************************************************/
import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
public class SwingEvent10 {
public static void main(String[] args){
GUI gui = new GUI();//instantiate a GUI
}//end main
}//end class SwingEvent10
//=======================================================//
//The following class is used to instantiate a
// graphical user interface object.
class GUI {
public GUI(){//constructor
//Create a new JFrame object, set size, title, etc.
JFrame displayWindow = new JFrame();
displayWindow.setSize(300,300);
displayWindow.setTitle("Copyright 1998, R.G.Baldwin");
//Add window listener to terminate the program
displayWindow.addWindowListener(new WProc1());
//Create a JButton object
JButton theButton = new JButton("Button");
//Register an AncestorListener object on the JButton
theButton.addAncestorListener(new MyAncestorListener());
//Add the JButton to the JFrame using content pane
displayWindow.getContentPane().add(theButton);
System.out.println("Make JFrame visible");
displayWindow.setVisible(true);
}//end constructor
//.....................................................//
//Begin inner class definitions
//The following listener is used to terminate the program
// when the user closes the frame.
class WProc1 extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}//end windowClosing()
}//end class WProc1
//.....................................................//
//Define an AncestorListener class
class MyAncestorListener implements AncestorListener{
//Define three methods declared in AncestorListener
// interface.
public void ancestorAdded(AncestorEvent e){
System.out.println("ancestorAdded method invoked");
System.out.println("Event source: " + e.getSource());
System.out.println("Ancestor: " + e.getAncestor());
System.out.println("Parent: " + e.getAncestorParent());
System.out.println("Component: " + e.getComponent());
System.out.println("ID value: " + e.getID());
}//end ancestorAdded()
public void ancestorRemoved(AncestorEvent e){
System.out.println("ancestorRemoved method");
}//end ancestorRemoved()
public void ancestorMoved(AncestorEvent e){
System.out.println("ancestorMoved method");
}//end ancestorMoved
}//end class MyAncestorListener
//.....................................................//
}//end class GUI definition
//=======================================================// |
גולשים מקוונים: 3