CODEWITHSUNDEEP
javaswingjframecenterjwindow
Travis
Travis

Reputation: 161

Center Swing Windows

I'm developing a Java Swing application. How can I make it so that when the program itself and any other windows open they come up in the center of the screen?

Upvotes: 16

Views: 14084

Answers (5)

camickr
camickr

Reputation: 324108

frame.setLocationRelativeTo( null );

Upvotes: 46

Saji
Saji

Reputation: 43

It is easy if you are using Netbeans. In property window of JFrame go to "Code" tab.There is an option as "Generate center".Check that option. JFrame will display in center.

Upvotes: 3

Rehan Farooq
Rehan Farooq

Reputation: 51

frame.setLocationRelativeTo(null); make the frame open in cetner

Regards, Rehan Farooq

Upvotes: 4

Taisin
Taisin

Reputation: 491

Doing it by hand in multi-screen environment gives something like this (static, 'cause you probably would want it in a utility class): 

  public static Rectangle getScreenBounds(Component top){
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice[] gd = ge.getScreenDevices();

    if (top != null){
        Rectangle bounds = top.getBounds();
        int centerX = (int) bounds.getCenterX();
        int centerY = (int) bounds.getCenterY();

        for (GraphicsDevice device : gd){
            GraphicsConfiguration gc = device.getDefaultConfiguration();
            Rectangle r = gc.getBounds();
            if (r.contains(centerX, centerY)){
                return r;
            }
        }
    }
    return gd[0].getDefaultConfiguration().getBounds();
}

public void centerWindowOnScreen(Window windowToCenter){
    Rectangle bounds = getScreenBounds(windowToCenter);
    Point newPt = new Point(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2);
    Dimension componentSize = windowToCenter.getSize();
    newPt.x -= componentSize.width / 2;
    newPt.y -= componentSize.height / 2;
    windowToCenter.setLocation(newPt);

}

As for default button, it's JDialog.getRootPane().setDefaultButton(btn), but button has to be already added to the dialog, and visible.

Upvotes: 1

Jules Olléon
Jules Olléon

Reputation: 6888

You'll have to do it by hand, using setLocation(x,y).

Something like:

Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation((dim.width-frameWidth)/2, (dim.height-frameHeight)/2);

should do it (not tested).

Upvotes: 1

Related Questions