Set frame max size

Question

hey, is there a way to prevent a JFrame from maximising beyond a certain size? I have a JFrame that is 800 by 400, and i dont want it to be smaller than 700 by 400 and larger than 900 by 400.
thanks
Pedge
Prog2(){
final Demo demo = new Demo();
DemoControls demoC;
demoC = new DemoControls(demo);
JFrame f = new JFrame("prog 2");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
public void windowDeiconified(WindowEvent e) { demo.start(); }
public void windowIconified(WindowEvent e) { demo.stop(); }});
f.getContentPane().add("Center", demo);
f.getContentPane().add("East", demoC);
f.pack();
f.setSize(new Dimension(800,400));
f.show();
demo.start();}

Answer 1

Hi,
In my programs I use the method update(Graphics g) from JFrame to keep the size of the window within boundaries.
This method is called each time when the size of the window is changed (and maybe also in other situations), but the way it works can be compared with paint (Graphics g) in applets.
Just try to compile the following code and see how it works.
(I know that it is not the best way to wish for, but this is one way of wich I know that it works)
Good luck,
Willy
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
class testFrame extends JFrame implements WindowListener {
// Constructor:
public testFrame () {
super ("Keeping the size within limits !!!");
this.setSize (new Dimension (700,400));
this.addWindowListener (this);
this.show ();
} // End of constructor
public void update (Graphics g) {
super.update (g);
Dimension oDim = this.getSize ();
double dWidth = oDim.getWidth();
double dHeight = oDim.getHeight();
if (dWidth > 900)
dWidth = 900;
if (dWidth < 700)
dWidth = 700;
if (dHeight != 400)
dHeight = 400;
oDim.setSize (dWidth,dHeight);
this.setSize (oDim);
} // End of method update
public static void main (String [] args) {
testFrame oFrame = new testFrame ();
} // End of method main
// Implementing methods :
public void windowClosing (WindowEvent e) {System.exit(1);}
public void windowDeiconified (WindowEvent e) {}
public void windowActivated (WindowEvent e) {}
public void windowOpened (WindowEvent e) {}
public void windowIconified (WindowEvent e) {}
public void windowClosed (WindowEvent e) {}
public void windowDeactivated (WindowEvent e) {}
} // End class testFrame