center Dialog - Java Swing

Java examples for Swing:JOptionPane

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Description

center Dialog

Demo Code


import java.awt.Dimension;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JDialog;
import org.apache.log4j.Logger;

public class Main{
    private final static Logger LOG = Logger.getLogger(DialogUtil.class);
    public static void centerDialog(Frame parent, JDialog dialog) {
        if (parent == null) {
            parent = getSelectedWindow();
        }//from   w  w w.j  av a 2  s .co m

        GraphicsEnvironment ge = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        Rectangle screenBounds = ge.getDefaultScreenDevice()
                .getDefaultConfiguration().getBounds();
        LOG.debug(String.format("Screen bounds: %s",
                screenBounds.toString()));

        Rectangle bounds = (parent != null) ? parent.getBounds()
                : screenBounds;
        LOG.debug(String.format("Selected bounds: %s", bounds));

        Dimension dialogSize = (dialog.isVisible()) ? dialog.getSize()
                : dialog.getPreferredSize();

        Point myLocation = getCenteringPoint(bounds, dialogSize);
        LOG.debug(String.format("Initial centering location: %s",
                myLocation));
        while (!screenBounds.contains(myLocation)) {
            LOG.debug("Point not within screen bounds");
            if (parent != null) {
                myLocation = getCenteringPoint(screenBounds, dialogSize);
                parent = null;
            } else {
                myLocation = screenBounds.getLocation();
            }
            LOG.debug(String.format("New point: %s", myLocation));
        }
        LOG.debug(String.format("Setting location to: %s", myLocation));
        dialog.setLocation(myLocation);
    }
    public static Frame getSelectedWindow() {
        for (Frame frame : Frame.getFrames()) {
            if (frame.isActive()) {
                return frame;
            }
        }
        return null;
    }
    private static Point getCenteringPoint(Rectangle area, Dimension size) {
        Point base = area.getLocation();
        LOG.debug(String.format("Base: %s", base));
        LOG.debug(String.format("dx = %s / 2 - %s / 2", area.getWidth(),
                size.getWidth()));
        int dx = (int) (area.getWidth() / 2 - size.getWidth() / 2);
        LOG.debug(String.format("dy = %s / 2 - %s / 2", area.getHeight(),
                size.getHeight()));
        int dy = (int) (area.getHeight() / 2 - size.getHeight() / 2);
        base.translate(dx, dy);
        LOG.debug(String.format("dx: %s - dy: %s - translated: %s", dx, dy,
                base));
        return base;
    }
}

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