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package javax.swing.plaf.basic;


import java.awt.*;
import java.io.*;

Center-positioning layout manager.
Author:Tom Santos, Steve Wilson
/** * Center-positioning layout manager. * @author Tom Santos * @author Steve Wilson */
class CenterLayout implements LayoutManager, Serializable { public void addLayoutComponent(String name, Component comp) { } public void removeLayoutComponent(Component comp) { } public Dimension preferredLayoutSize( Container container ) { Component c = container.getComponent( 0 ); if ( c != null ) { Dimension size = c.getPreferredSize(); Insets insets = container.getInsets(); return new Dimension(size.width + insets.left + insets.right, size.height + insets.top + insets.bottom); } else { return new Dimension( 0, 0 ); } } public Dimension minimumLayoutSize(Container cont) { return preferredLayoutSize(cont); } public void layoutContainer(Container container) { if (container.getComponentCount() > 0) { Component c = container.getComponent(0); Dimension pref = c.getPreferredSize(); int containerWidth = container.getWidth(); int containerHeight = container.getHeight(); Insets containerInsets = container.getInsets(); containerWidth -= containerInsets.left + containerInsets.right; containerHeight -= containerInsets.top + containerInsets.bottom; int left = (containerWidth - pref.width) / 2 + containerInsets.left; int right = (containerHeight - pref.height) / 2 + containerInsets.top; c.setBounds(left, right, pref.width, pref.height); } } }