How to place a window in the center of the screen ?

(Tom Parson) wrote in
news:4379d7b5$0$21942$:

> I would like to open a window and to placed it at a certain position
> on a screen (e.g. in the center).
>
> public static void main(String args[]) {
> testGBL window = new testGBL();
> window.setTitle("test");
> window.pack();
> window.setVisible(true); }
> }
>
>

put this in ---

Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
int x = (int) ((d.getWidth() - this.getWidth())/ 2);
int y = (int) ((d.getHeight() - this.getHeight())/ 2);
this.setLocation(x, y);
//this.setAlwaysOnTop(true); // show on top - 5.0
this.setVisible(true);

red eff

> I would like to open a window and to placed it at a certain position on a screen

If the variables "width" and "height" are the width and height of your
JFrame, something like this:

int width = 700;
int height = 233;
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
int x = (screen.width-width)/2;
int y = (screen.height - height)/2;
setBounds(x,y,width,height);

jonck@vanderkogel.net

I had to do this a few days ago.
This is the code I wrote :

public static void center(JFrame frame) {

frame.pack();
double height = frame.getHeight();
double width = frame.getWidth();

Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();

double x = screen.getWidth() - width;
double y = screen.getHeight() - height;
x = x / 2.0;
y = y / 2.0;

if ( x < 0) x = 0;
if ( y < 0) y = 0;

frame.setBounds((int)x,(int)y,(int)width,(int)heig ht);




}

Hope this will help

Olivier

"Tom Parson" <> a écrit dans le message de news:
4379d7b5$0$21942$...
>I would like to open a window and to placed it at a certain position on a
>screen
> (e.g. in the center).
>
> How do I do this? My (simplified) current code looks like:
>
>
>
> public class testGBL extends JFrame implements ActionListener {
> JLabel lab1;
> ....
> JButton butBack;
>
> public testGBL() {
>
> ...
> Container contentPane = getContentPane();
> GridBagLayout gridbag = new GridBagLayout();
> GridBagConstraints c = new GridBagConstraints();
> contentPane.setLayout(gridbag);
>
> c.fill = GridBagConstraints.HORIZONTAL;
>
> butBack = new JButton("Back");
> c.gridx = 0;
> c.gridy = 0;
> c.weightx = 1.0;
> c.gridwidth = 2;
> gridbag.setConstraints(butBack, c);
> butBack.setEnabled(false);
> butBack.addActionListener(this);
> contentPane.add(butBack);
> ....
> }
>
> public static void main(String args[]) {
> testGBL window = new testGBL();
> window.setTitle("test");
> window.pack();
> window.setVisible(true); }
> }
>

tele2

Tom Parson wrote:
> I would like to open a window and to placed it at a certain position on a screen
> (e.g. in the center).
>
> How do I do this? My (simplified) current code looks like:
>
>

This puts the window itself in the middle of the screen and not just the
top left corner of the window.

Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame.setSize(dim.width/4, dim.height/4);
frame.setLocation(dim.width/2 - dim.width/8, dim.height/2 - dim.height/;

>
> public class testGBL extends JFrame implements ActionListener {
> JLabel lab1;
> ....
> JButton butBack;
>
> public testGBL() {
>
> ...
> Container contentPane = getContentPane();
> GridBagLayout gridbag = new GridBagLayout();
> GridBagConstraints c = new GridBagConstraints();
> contentPane.setLayout(gridbag);
>
> c.fill = GridBagConstraints.HORIZONTAL;
>
> butBack = new JButton("Back");
> c.gridx = 0;
> c.gridy = 0;
> c.weightx = 1.0;
> c.gridwidth = 2;
> gridbag.setConstraints(butBack, c);
> butBack.setEnabled(false);
> butBack.addActionListener(this);
> contentPane.add(butBack);
> ....
> }
>
> public static void main(String args[]) {
> testGBL window = new testGBL();
> window.setTitle("test");
> window.pack();
> window.setVisible(true); }
> }
>

Brandon McCombs

Here is the code to place ur frame in the center of the screen:

Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();

if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
}

if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
}

int frameX = (screenSize.height - frameSize.height) / 2;
int frameY = (screenSize.height - frameSize.height) / 2;

frame.setLocation(frameX, frameY);

Raja

Raja wrote:
> Here is the code to place ur frame in the center of the screen:
>
> Dimension screenSize =
> Toolkit.getDefaultToolkit().getScreenSize();
> Dimension frameSize = frame.getSize();
>
> if (frameSize.height > screenSize.height) {
> frameSize.height = screenSize.height;
> }
>
> if (frameSize.width > screenSize.width) {
> frameSize.width = screenSize.width;
> }
>
> int frameX = (screenSize.height - frameSize.height) / 2;

width????

> int frameY = (screenSize.height - frameSize.height) / 2;
>
> frame.setLocation(frameX, frameY);
>

Vova Reznik

Tom Parson wrote:

> I would like to open a window and to placed it at a certain position on a screen
> (e.g. in the center).

> How do I do this?

Specifically to place it in the center (but not some arbitrary other
place),
Sun shows a pretty way to do this in:

http://java.sun.com/docs/books/tutor...rameDemo2.java

The line in question says (for a JFrame):

frame.setLocationRelativeTo(null); //center it

and is line 263 in that example. That actually works, though why
it does is probably some Java internals defaults mystery.

Otherwise, the usual trick is to use setLocation, which uses the frame
top left corner coordinates (in some form) as its input.

HTH

xanthian.

Kent Paul Dolan