get Centered Dialog Bounds - Java Swing

Java examples for Swing:JDialog

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Description

get Centered Dialog Bounds

Demo Code

/*/*w w w .  j av a2s  .c  o m*/
    JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
    Release Version 2.4

    A project from the Physics Dept, The University of Oxford

    Copyright (C) 2007-2010 The University of Oxford

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 as published by
    the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
         
    Details (including contact information) can be found at: 

    jpc.sourceforge.net
    or the developer website
    sourceforge.net/projects/jpc/

    Conceived and Developed by:
    Rhys Newman, Ian Preston, Chris Dennis

    End of licence header
 */
//package com.java2s;
import java.awt.*;

import javax.swing.*;

public class Main {
    public static Rectangle getCentredDialogBounds(JDialog dialog,
            Component parent, int defaultWidth, int defaultHeight) {
        Dimension pref = dialog.getPreferredSize();
        int w = pref.width;
        int h = pref.height;

        if (defaultWidth > 0)
            w = defaultWidth;
        if (defaultHeight > 0)
            h = defaultHeight;

        Rectangle parentBounds = parent.getBounds();
        Dimension size = new Dimension(defaultWidth, defaultHeight);
        int x = parentBounds.x + (parentBounds.width - size.width) / 2;
        int y = parentBounds.y + (parentBounds.height - size.height) / 2;
        Point pt = new Point(x, y);
        SwingUtilities
                .convertPointToScreen(pt, getApplicationFrame(dialog));
        x = Math.max(0, pt.x);
        y = Math.max(0, pt.y);

        return new Rectangle(x, y, size.width, size.height);
    }

    public static Frame getApplicationFrame(Component child) {
        for (Component c = child; c != null; c = c.getParent())
            if (c instanceof Frame)
                return (Frame) c;

        return null;
    }
}

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