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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 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 java.awt; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * An <code>Insets</code> object is a representation of the borders | |
| 30 | + * of a container. It specifies the space that a container must leave | |
| 31 | + * at each of its edges. The space can be a border, a blank space, or | |
| 32 | + * a title. | |
| 33 | + * | |
| 34 | + * @author Arthur van Hoff | |
| 35 | + * @author Sami Shaio | |
| 36 | + * @see java.awt.LayoutManager | |
| 37 | + * @see java.awt.Container | |
| 38 | + * @since JDK1.0 | |
| 39 | + */ | |
| 40 | +public class Insets implements Cloneable, java.io.Serializable { | |
| 41 | + | |
| 42 | + /** | |
| 43 | + * The inset from the top. | |
| 44 | + * This value is added to the Top of the rectangle | |
| 45 | + * to yield a new location for the Top. | |
| 46 | + * | |
| 47 | + * @serial | |
| 48 | + * @see #clone() | |
| 49 | + */ | |
| 50 | + public int top; | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * The inset from the left. | |
| 54 | + * This value is added to the Left of the rectangle | |
| 55 | + * to yield a new location for the Left edge. | |
| 56 | + * | |
| 57 | + * @serial | |
| 58 | + * @see #clone() | |
| 59 | + */ | |
| 60 | + public int left; | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * The inset from the bottom. | |
| 64 | + * This value is subtracted from the Bottom of the rectangle | |
| 65 | + * to yield a new location for the Bottom. | |
| 66 | + * | |
| 67 | + * @serial | |
| 68 | + * @see #clone() | |
| 69 | + */ | |
| 70 | + public int bottom; | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * The inset from the right. | |
| 74 | + * This value is subtracted from the Right of the rectangle | |
| 75 | + * to yield a new location for the Right edge. | |
| 76 | + * | |
| 77 | + * @serial | |
| 78 | + * @see #clone() | |
| 79 | + */ | |
| 80 | + public int right; | |
| 81 | + | |
| 82 | + /* | |
| 83 | + * JDK 1.1 serialVersionUID | |
| 84 | + */ | |
| 85 | + private static final long serialVersionUID = -2272572637695466749L; | |
| 86 | + | |
| 87 | + static { | |
| 88 | + /* ensure that the necessary native libraries are loaded */ | |
| 89 | + Toolkit.loadLibraries(); | |
| 90 | + if (!GraphicsEnvironment.isHeadless()) { | |
| 91 | + initIDs(); | |
| 92 | + } | |
| 93 | + } | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Creates and initializes a new <code>Insets</code> object with the | |
| 97 | + * specified top, left, bottom, and right insets. | |
| 98 | + * @param top the inset from the top. | |
| 99 | + * @param left the inset from the left. | |
| 100 | + * @param bottom the inset from the bottom. | |
| 101 | + * @param right the inset from the right. | |
| 102 | + */ | |
| 103 | + public Insets(int top, int left, int bottom, int right) { | |
| 104 | + this.top = top; | |
| 105 | + this.left = left; | |
| 106 | + this.bottom = bottom; | |
| 107 | + this.right = right; | |
| 108 | + } | |
| 109 | + | |
| 110 | + /** | |
| 111 | + * Set top, left, bottom, and right to the specified values | |
| 112 | + * | |
| 113 | + * @param top the inset from the top. | |
| 114 | + * @param left the inset from the left. | |
| 115 | + * @param bottom the inset from the bottom. | |
| 116 | + * @param right the inset from the right. | |
| 117 | + * @since 1.5 | |
| 118 | + */ | |
| 119 | + public void set(int top, int left, int bottom, int right) { | |
| 120 | + this.top = top; | |
| 121 | + this.left = left; | |
| 122 | + this.bottom = bottom; | |
| 123 | + this.right = right; | |
| 124 | + } | |
| 125 | + | |
| 126 | + /** | |
| 127 | + * Checks whether two insets objects are equal. Two instances | |
| 128 | + * of <code>Insets</code> are equal if the four integer values | |
| 129 | + * of the fields <code>top</code>, <code>left</code>, | |
| 130 | + * <code>bottom</code>, and <code>right</code> are all equal. | |
| 131 | + * @return <code>true</code> if the two insets are equal; | |
| 132 | + * otherwise <code>false</code>. | |
| 133 | + * @since JDK1.1 | |
| 134 | + */ | |
| 135 | + public boolean equals(Object obj) { | |
| 136 | + if (obj instanceof Insets) { | |
| 137 | + Insets insets = (Insets)obj; | |
| 138 | + return ((top == insets.top) && (left == insets.left) && | |
| 139 | + (bottom == insets.bottom) && (right == insets.right)); | |
| 140 | + } | |
| 141 | + return false; | |
| 142 | + } | |
| 143 | + | |
| 144 | + /** | |
| 145 | + * Returns the hash code for this Insets. | |
| 146 | + * | |
| 147 | + * @return a hash code for this Insets. | |
| 148 | + */ | |
| 149 | + public int hashCode() { | |
| 150 | + int sum1 = left + bottom; | |
| 151 | + int sum2 = right + top; | |
| 152 | + int val1 = sum1 * (sum1 + 1)/2 + left; | |
| 153 | + int val2 = sum2 * (sum2 + 1)/2 + top; | |
| 154 | + int sum3 = val1 + val2; | |
| 155 | + return sum3 * (sum3 + 1)/2 + val2; | |
| 156 | + } | |
| 157 | + | |
| 158 | + /** | |
| 159 | + * Returns a string representation of this <code>Insets</code> object. | |
| 160 | + * This method is intended to be used only for debugging purposes, and | |
| 161 | + * the content and format of the returned string may vary between | |
| 162 | + * implementations. The returned string may be empty but may not be | |
| 163 | + * <code>null</code>. | |
| 164 | + * | |
| 165 | + * @return a string representation of this <code>Insets</code> object. | |
| 166 | + */ | |
| 167 | + public String toString() { | |
| 168 | + return getClass().getName() + "[top=" + top + ",left=" + left + ",bottom=" + bottom + ",right=" + right + "]"; | |
| 169 | + } | |
| 170 | + | |
| 171 | + /** | |
| 172 | + * Create a copy of this object. | |
| 173 | + * @return a copy of this <code>Insets</code> object. | |
| 174 | + */ | |
| 175 | + public Object clone() { | |
| 176 | + try { | |
| 177 | + return super.clone(); | |
| 178 | + } catch (CloneNotSupportedException e) { | |
| 179 | + // this shouldn't happen, since we are Cloneable | |
| 180 | + throw new InternalError(); | |
| 181 | + } | |
| 182 | + } | |
| 183 | + /** | |
| 184 | + * Initialize JNI field and method IDs | |
| 185 | + */ | |
| 186 | + private static native void initIDs(); | |
| 187 | + | |
| 188 | +} | |