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

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); }
}

Tom Parson

"Tom Parson" <> wrote in message
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).

window.setLocation(int x, int y);

or if you want it in the centre use this cludge:

window.setLocationRelativeTo(null);

should take a component as the argument and centre it on that

--
Mike W

>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); }
> }


Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
int X = (screen.width / 2) - (widthWindow / 2); // Center horizontally.
int Y = (screen.height / 2) - (heightWindow / 2); // Center vertically.

window.setBounds(X,Y , widthWindow,heightWindow);

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:
>
>
>
> 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); }
> }
>

..setLocation() or .setBounds().

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).

There's an easy way to center a Swing JFrame on the screen:

f.setLocationRelativeTo(null);

Do this after the pack() or setSize(...) call.

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

On 15 Nov 2005 12:42:30 GMT, (Tom Parson) wrote,
quoted or indirectly quoted someone who said :

>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:

see http://mindprod.com/jgloss/coordinates.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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:
>
>
>
> public class testGBL extends JFrame implements ActionListener {
....snip

Tom,

You can call the the setBounds method to fine tune the components
location and size on the screen.

A java.awt.Toolkit object will also be helpful if you want information
son the screen size in order to place your component in a relative location.

Carl.

"Tom Parson" <> wrote in message
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;
>
Take a look at the Toolkit (getDefaultToolkit) and its getScreenSize()
method which returns a DImension object, which has width and height
properties of the screen.
Then you use the setBounds method of the JFrame to set the x,y,width,and
height from your meticulous calculations.

after packing the window, you must set the position of the window like
this.

left_of_window = (screen_resolution_width - width_of_the_window)/2
top_of_the_window = (screen_resolution_height - height_of_the_window)
/2

this would center the window in the screen.

/Cheers,
-MadGuy

To place the JFrame at the desired origin, use setLocation() method. To
center JFrame on the screen, use setLocationRelativeTo(null).

Reading the JFrame docs could also help.

"Tom Parson" <> wrote in message
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); }
> }
>