I had made one application in java-swing,
Now what i am getting problem is, i want to minimize my jframe when it is deactivate and then to maximize i want to activate that window.So for maximize, i want to activate any jframe using java code.
So how to activate and dea开发者_如何学运维ctivate any jframe, so that i can do something on window listeners?thanks in advance.
You'll need to add a WindowListener to your JFrame, and add the following logic to your listener:
public class Demo extends JFrame implements WindowListener {
public Demo() {
addWindowListener(this);
}
public void windowActivated(WindowEvent e) {
setExtendedState(getExtendedState() | Frame.ICONIFIED);
}
public void windowDeactivated(WindowEvent e) {
setExtendedState(getExtendedState() | Frame.MAXIMIZED_BOTH);
}
....
}
The following works:
import java.awt.Frame;
import javax.swing.*;
public class FrameTest {
public static void main(String[] args) throws InterruptedException {
// Create a test frame
JFrame frame = new JFrame("Hello");
frame.add(new JLabel("Minimize demo"));
frame.pack();
// Show the frame
frame.setVisible(true);
// Sleep for 5 seconds, then minimize
Thread.sleep(5000);
frame.setState(Frame.ICONIFIED);
// Sleep for 5 seconds, then restore
Thread.sleep(5000);
frame.setState(Frame.NORMAL);
// Sleep for 5 seconds, then kill window
Thread.sleep(5000);
frame.setVisible(false);
frame.dispose();
// Terminate test
System.exit(0);
}
}
Modified from http://www.javacoffeebreak.com/faq/faq0055.html
To focus the window you can do frame.requestFocus();
.
In my practice, I often encountered a problem when the window is not activated when the usual attributes are set: frame.setVisible (true); frame.setState (Frame.NORMAL);
and I found a solution where the window is activated:
frame.setExtendedState (JFrame.ICONIFIED);
frame.setExtendedState (JFrame.NORMAL);
frame.toFront ();
frame.requestFocus ();
// frame - JFrame
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