Center Layout
/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: lobochief@users.sourceforge.net
*/
/*
* Created on Mar 19, 2005
*/
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager;
/**
* @author J. H. S.
*/
public class CenterLayout implements LayoutManager {
public void addLayoutComponent(String arg0, Component arg1) {
}
public void removeLayoutComponent(Component arg0) {
}
public Dimension preferredLayoutSize(Container arg0) {
java.awt.Insets insets = arg0.getInsets();
int count = arg0.getComponentCount();
if(count > 0) {
Dimension d = arg0.getComponent(0).getPreferredSize();
return new Dimension(d.width + insets.left + insets.right,
d.height + insets.top + insets.bottom);
}
else {
return new Dimension(insets.left + insets.right, insets.top + insets.bottom);
}
}
/* (non-Javadoc)
* @see java.awt.LayoutManager#minimumLayoutSize(java.awt.Container)
*/
public Dimension minimumLayoutSize(Container arg0) {
java.awt.Insets insets = arg0.getInsets();
int count = arg0.getComponentCount();
if(count > 0) {
Dimension d = arg0.getComponent(0).getMinimumSize();
return new Dimension(d.width + insets.left + insets.right,
d.height + insets.top + insets.bottom);
}
else {
return new Dimension(insets.left + insets.right, insets.top + insets.bottom);
}
}
/* (non-Javadoc)
* @see java.awt.LayoutManager#layoutContainer(java.awt.Container)
*/
public void layoutContainer(Container container) {
int count = container.getComponentCount();
if(count > 0) {
Component child = container.getComponent(0);
java.awt.Insets insets = container.getInsets();
int availWidth = container.getWidth() - insets.left - insets.right;
int availHeight = container.getHeight() - insets.top - insets.bottom;
Dimension preferredSize = child.getPreferredSize();
double preferredWidth = preferredSize.getWidth();
double preferredHeight = preferredSize.getHeight();
int width;
int height;
int x;
int y;
if(preferredWidth < availWidth) {
x = (int) Math.round(insets.left + (availWidth - preferredWidth) / 2);
width = (int) Math.round(preferredWidth);
}
else {
x = insets.left;
width = availWidth;
}
if(preferredHeight < availHeight) {
y = (int) Math.round(insets.top + (availHeight - preferredHeight) / 2);
height = (int) Math.round(preferredHeight);
}
else {
y = insets.top;
height = availHeight;
}
child.setBounds(x, y, width, height);
}
}
private static CenterLayout instance = new CenterLayout();
public static CenterLayout getInstance() {
return instance;
}
}
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