1 /* 2 * Copyright (c) 1997, 2015, 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 package javax.swing.border; 26 27 import java.awt.Graphics; 28 import java.awt.Insets; 29 import java.awt.Rectangle; 30 import java.awt.Component; 31 import java.io.Serializable; 32 import java.beans.ConstructorProperties; 33 34 /** 35 * A class which provides an empty, transparent border which 36 * takes up space but does no drawing. 37 * <p> 38 * <strong>Warning:</strong> 39 * Serialized objects of this class will not be compatible with 40 * future Swing releases. The current serialization support is 41 * appropriate for short term storage or RMI between applications running 42 * the same version of Swing. As of 1.4, support for long term storage 43 * of all JavaBeans™ 44 * has been added to the <code>java.beans</code> package. 45 * Please see {@link java.beans.XMLEncoder}. 46 * 47 * @author David Kloba 48 */ 49 @SuppressWarnings("serial") 50 public class EmptyBorder extends AbstractBorder implements Serializable 51 { 52 /** 53 * The left inset of the border. 54 */ 55 protected int left; 56 /** 57 * The right inset of the border. 58 */ 59 protected int right; 60 /** 61 * The top inset of the border. 62 */ 63 protected int top; 64 /** 65 * The bottom inset of the border. 66 */ 67 protected int bottom; 68 69 /** 70 * Creates an empty border with the specified insets. 71 * @param top the top inset of the border 72 * @param left the left inset of the border 73 * @param bottom the bottom inset of the border 74 * @param right the right inset of the border 75 */ 76 public EmptyBorder(int top, int left, int bottom, int right) { 77 this.top = top; 78 this.right = right; 79 this.bottom = bottom; 80 this.left = left; 81 } 82 83 /** 84 * Creates an empty border with the specified insets. 85 * @param borderInsets the insets of the border 86 */ 87 @ConstructorProperties({"borderInsets"}) 88 public EmptyBorder(Insets borderInsets) { 89 this.top = borderInsets.top; 90 this.right = borderInsets.right; 91 this.bottom = borderInsets.bottom; 92 this.left = borderInsets.left; 93 } 94 95 /** 96 * Does no drawing by default. 97 */ 98 public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) { 99 } 100 101 /** 102 * Reinitialize the insets parameter with this Border's current Insets. 103 * @param c the component for which this border insets value applies 104 * @param insets the object to be reinitialized 105 */ 106 public Insets getBorderInsets(Component c, Insets insets) { 107 insets.left = left; 108 insets.top = top; 109 insets.right = right; 110 insets.bottom = bottom; 111 return insets; 112 } 113 114 /** 115 * Returns the insets of the border. 116 * 117 * @return an {@code Insets} object containing the insets from top, left, 118 * bottom and right 119 * @since 1.3 120 */ 121 public Insets getBorderInsets() { 122 return new Insets(top, left, bottom, right); 123 } 124 125 /** 126 * Returns whether or not the border is opaque. 127 * Returns false by default. 128 */ 129 public boolean isBorderOpaque() { return false; } 130 131 }