Java WindowFocusListener .windowLostFocus (WindowEvent e)
Syntax
WindowFocusListener.windowLostFocus(WindowEvent e) has the following syntax.
void windowLostFocus(WindowEvent e)
Example
In the following code shows how to use WindowFocusListener.windowLostFocus(WindowEvent e) method.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
/* w ww .j a v a 2s.c o m*/
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main extends JFrame implements
WindowFocusListener{
static Main frame = new Main("WindowEventDemo");
JTextArea display;
public static void main(String[] args) {
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addComponentsToPane();
frame.pack();
frame.setVisible(true);
}
private void addComponentsToPane() {
display = new JTextArea();
display.setEditable(false);
JScrollPane scrollPane = new JScrollPane(display);
scrollPane.setPreferredSize(new Dimension(500, 450));
getContentPane().add(scrollPane, BorderLayout.CENTER);
addWindowFocusListener(this);
}
public Main(String name) {
super(name);
}
public void windowGainedFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowGainedFocus.");
}
public void windowLostFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowLostFocus.");
}
private void displayMessage(String msg) {
display.append(msg+"\n");
System.out.println(msg);
}
}
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