Mega Code Archive
Center Within Parent
<![CDATA[
/*
* Copyright (C) 2001-2004 Colin Bell
* colbell@users.sourceforge.net
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.geom.Rectangle2D;
import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;
/**
* Common GUI utilities accessed via static methods.
*
* @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
*/
public class GUIUtils {
private static JFrame _mainFrame;
/**
* Centers <CODE>wind</CODE> within its parent. If it has no parent then
* center within the screen. If centering would cause the title bar to go
* above the parent (I.E. cannot see the titlebar and so cannot move the
* window) then move the window down.
*
* @param wind
* The Window to be centered.
*
* @throws IllegalArgumentException
* If <TT>wind</TT> is <TT>null</TT>.
*/
public static void centerWithinParent(Window wind) {
if (wind == null) {
throw new IllegalArgumentException("null Window passed");
}
final Container parent = wind.getParent();
if (parent != null && parent.isVisible()) {
center(wind, new Rectangle(parent.getLocationOnScreen(), parent.getSize()));
} else {
centerWithinScreen(wind);
}
}
/**
* Centers passed internal frame within its desktop area. If centering would
* cause the title bar to go off the top of the screen then move the window
* down.
*
* @param frame
* The internal frame to be centered.
*
* @throws IllegalArgumentException
* If <TT>frame</TT> is <TT>null</TT>.
*/
public static void centerWithinDesktop(JInternalFrame frame) {
if (frame == null) {
throw new IllegalArgumentException("null JInternalFrame passed");
}
final Container parent = frame.getDesktopPane();
if (parent != null && parent.isVisible()) {
center(frame, new Rectangle(new Point(0, 0), parent.getSize()));
}
}
/**
* Centers <CODE>wind</CODE> within the screen. If centering would cause the
* title bar to go off the top of the screen then move the window down.
*
* @param wind
* The Window to be centered.
*
* @throws IllegalArgumentException
* If <TT>wind</TT> is <TT>null</TT>.
*/
public static void centerWithinScreen(Window wind) {
if (wind == null) {
throw new IllegalArgumentException("null Window passed");
}
final Toolkit toolKit = Toolkit.getDefaultToolkit();
final Rectangle rcScreen = new Rectangle(toolKit.getScreenSize());
final Dimension windSize = wind.getSize();
final Dimension parentSize = new Dimension(rcScreen.width, rcScreen.height);
if (windSize.height > parentSize.height) {
windSize.height = parentSize.height;
}
if (windSize.width > parentSize.width) {
windSize.width = parentSize.width;
}
center(wind, rcScreen);
}
/**
* Centers <CODE>wind</CODE> within the passed rectangle.
*
* @param wind
* The Window to be centered.
* @param rect
* The rectangle (in screen coords) to center <CODE>wind</CODE>
* within.
*
* @throws IllegalArgumentException
* If <TT>Window</TT> or <TT>Rectangle</TT> is <TT>null</TT>.
*/
private static void center(Component wind, Rectangle rect) {
if (wind == null || rect == null) {
throw new IllegalArgumentException("null Window or Rectangle passed");
}
Dimension windSize = wind.getSize();
int x = ((rect.width - windSize.width) / 2) + rect.x;
int y = ((rect.height - windSize.height) / 2) + rect.y;
if (y < rect.y) {
y = rect.y;
}
wind.setLocation(x, y);
}
}
]]>