1 /* 2 * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.swing.plaf.basic; 27 28 29 import java.awt.*; 30 import java.io.*; 31 32 /** 33 * Center-positioning layout manager. 34 * @author Tom Santos 35 * @author Steve Wilson 36 */ 37 class CenterLayout implements LayoutManager, Serializable { 38 public void addLayoutComponent(String name, Component comp) { } 39 public void removeLayoutComponent(Component comp) { } 40 41 public Dimension preferredLayoutSize( Container container ) { 42 Component c = container.getComponent( 0 ); 43 if ( c != null ) { 44 Dimension size = c.getPreferredSize(); 45 Insets insets = container.getInsets(); 46 47 return new Dimension(size.width + insets.left + insets.right, 48 size.height + insets.top + insets.bottom); 49 } 50 else { 51 return new Dimension( 0, 0 ); 52 } 53 } 54 55 public Dimension minimumLayoutSize(Container cont) { 56 return preferredLayoutSize(cont); 57 } 58 59 public void layoutContainer(Container container) { 60 if (container.getComponentCount() > 0) { 61 Component c = container.getComponent(0); 62 Dimension pref = c.getPreferredSize(); 63 int containerWidth = container.getWidth(); 64 int containerHeight = container.getHeight(); 65 Insets containerInsets = container.getInsets(); 66 67 containerWidth -= containerInsets.left + 68 containerInsets.right; 69 containerHeight -= containerInsets.top + 70 containerInsets.bottom; 71 72 int left = (containerWidth - pref.width) / 2 + 73 containerInsets.left; 74 int right = (containerHeight - pref.height) / 2 + 75 containerInsets.top; 76 77 c.setBounds(left, right, pref.width, pref.height); 78 } 79 } 80 }