The application given below brings up a scrollpane that has no child.

On Windows NT, this scrollpane has scrollbars.
On Solaris OpenWindows, it doesn't.


/*
  ScrollpaneNochild.java
  This application displays a scrollpane with no child
*/


import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class ScrollpaneNochild extends Frame {
 
    public ScrollpaneNochild () {
        setLayout(new BorderLayout());
        setFont(new Font("Helvetica", Font.PLAIN, 14));
    }

    public static void main(String args[]) {
        ScrollpaneNochild window = new ScrollpaneNochild();

// Panel for the scrollpane
Panel scrollpanePanel = new Panel();

// Scrollpane
        ScrollPane scrollpane= new ScrollPane();

// Set size of scrollpane
scrollpane.setSize(150, 300);

// Add scrollpane to scrollpane panel
scrollpanePanel.setLayout(new GridLayout(0, 1));
        scrollpanePanel.add(scrollpane);

// Add scrollpane panel to window
        window.add("North", scrollpanePanel);

// Display window
        window.setTitle("ScrollpaneNochild Application");
        window.addWindowListener(new EventAdapter());
        window.pack();
        window.show();
    }
}


// ******************************* EventAdapter ***************************

class EventAdapter implements WindowListener {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowOpened(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
}



ronan.mandel@Eng 1997-10-23
Here is another example:

import java.awt.*;
import java.awt.event.*;

class ScrollHandle extends ScrollPane implements AdjustmentListener {
    int count;

    ScrollHandle() {
        setSize(400, 600);
        getVAdjustable().addAdjustmentListener(this);
        getHAdjustable().addAdjustmentListener(this);
        count = 0;
    }
    
    public void adjustmentValueChanged(AdjustmentEvent e) {
        System.out.println("value" + e.getValue());
        System.out.println(e);
        count++;
        System.out.println("count " + count);
    }
    
    public static final void main(String[] args) {
        Frame f = new Frame();
        f.setSize(200, 200);
        ScrollHandle sh = new ScrollHandle();
        f.add(sh);
        f.show();
    }
}