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: [email protected] */ /* * 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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