1/* 2 * Copyright (c) 1998, 2014, 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 26package javax.swing.plaf.basic; 27 28 29import java.awt.*; 30import java.io.*; 31 32/** 33 * Center-positioning layout manager. 34 * @author Tom Santos 35 * @author Steve Wilson 36 */ 37@SuppressWarnings("serial") // Same-version serialization only 38class CenterLayout implements LayoutManager, Serializable { 39 public void addLayoutComponent(String name, Component comp) { } 40 public void removeLayoutComponent(Component comp) { } 41 42 public Dimension preferredLayoutSize( Container container ) { 43 Component c = container.getComponent( 0 ); 44 if ( c != null ) { 45 Dimension size = c.getPreferredSize(); 46 Insets insets = container.getInsets(); 47 48 return new Dimension(size.width + insets.left + insets.right, 49 size.height + insets.top + insets.bottom); 50 } 51 else { 52 return new Dimension( 0, 0 ); 53 } 54 } 55 56 public Dimension minimumLayoutSize(Container cont) { 57 return preferredLayoutSize(cont); 58 } 59 60 public void layoutContainer(Container container) { 61 if (container.getComponentCount() > 0) { 62 Component c = container.getComponent(0); 63 Dimension pref = c.getPreferredSize(); 64 int containerWidth = container.getWidth(); 65 int containerHeight = container.getHeight(); 66 Insets containerInsets = container.getInsets(); 67 68 containerWidth -= containerInsets.left + 69 containerInsets.right; 70 containerHeight -= containerInsets.top + 71 containerInsets.bottom; 72 73 int left = (containerWidth - pref.width) / 2 + 74 containerInsets.left; 75 int right = (containerHeight - pref.height) / 2 + 76 containerInsets.top; 77 78 c.setBounds(left, right, pref.width, pref.height); 79 } 80 } 81} 82