trap maximize event and get new width of frame

Question

I tried to do this in Java:

public class Fram extends JFrame{
     public void init(){

        addWindowStateListener(new java.awt.event.WindowStateListener() {
            public void windowStateChanged(java.awt.event.WindowEvent evt) {
                wsc(evt);
            }
        });

    }
    private void wsc(java.awt.event.WindowEvent evt) {                     

        System.out.println(evt.getNewState() == Frame.MAXIMIZED_BOTH);
        System.out.println(this.getWidth());
    }                    
}

And the output is late.

When I maximize it the value is 360, but actual value is 1260. How do I the get width after maximizing?

You're never assigning a new width if I am not mistaken. You're only printing it out. — Marv, Dec 15 '14 at 16:22
What happens when you try using a ComponentListener and listen in on the `componentResized(...)` method? — Hovercraft Full Of Eels, Dec 15 '14 at 16:30

score 1 · Accepted Answer · answered Dec 15 '14 at 16:30

1

It's a bit confusing. You actually have to implement ComponentListener. Then componentResized() is called. This will give you the correct width.

answered Dec 15 '14 at 16:30

markbernard

1,412
9
18

score 1 · Answer 2 · answered Dec 15 '14 at 16:31

when i maximize it the value is 360 but actual value is 1260 hot to get width after maximize?

Try wrapping your code in a SwingUtiltities.invokeLater(). This will place the code at the end of the Event Dispatch Thread (EDT) so it should execute after the resizing code has been completed.

score 0 · Answer 3 · edited May 23 '17 at 12:04

ok i found the solution this post is not at all right.

How to detect JFrame window minimize and maximize events?

this code, do the trick

import java.awt.Dimension;
import java.awt.Frame;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;

import javax.swing.JFrame;

public class Main extends JFrame implements ComponentListener {
  public Main() {
    addComponentListener(this);
  }

  public void componentHidden(ComponentEvent e) {
    System.out.println("componentHidden");
  }

  public void componentMoved(ComponentEvent e) {
    System.out.println("componentMoved");
  }

  public void componentResized(ComponentEvent e) {
    System.out.println("componentResized");

    if (getState() == Frame.ICONIFIED) {
      System.out.println("RESIZED TO ICONIFIED");
    } else if (getState() == Frame.NORMAL) {
      System.out.println("RESIZED TO NORMAL");
    } else {
      System.out.println("RESIZED TO MAXIMIZED");
    }
  }

  public void componentShown(ComponentEvent e) {
  }

  public static void main(String[] arg) {
    Main m = new Main();

    m.setVisible(true);
    m.setSize(new Dimension(300, 100));
    m.setLocation(50, 50);
  }
}

trap maximize event and get new width of frame

3 Answers3