1 /* 2 * Copyright (c) 2006, 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 * The {@code GridBagLayoutInfo} is an utility class for 30 * {@code GridBagLayout} layout manager. 31 * It stores align, size and baseline parameters for every component within a container. 32 * 33 * @see java.awt.GridBagLayout 34 * @see java.awt.GridBagConstraints 35 * @since 1.6 36 */ 37 public class GridBagLayoutInfo implements java.io.Serializable { 38 /* 39 * serialVersionUID 40 */ 41 private static final long serialVersionUID = -4899416460737170217L; 42 43 int width, height; /* number of cells: horizontal and vertical */ 44 int startx, starty; /* starting point for layout */ 45 int minWidth[]; /* largest minWidth in each column */ 46 int minHeight[]; /* largest minHeight in each row */ 47 double weightX[]; /* largest weight in each column */ 48 double weightY[]; /* largest weight in each row */ 49 boolean hasBaseline; /* Whether or not baseline layout has been 50 * requested and one of the components 51 * has a valid baseline. */ 52 // These are only valid if hasBaseline is true and are indexed by 53 // row. 54 short baselineType[]; /* The type of baseline for a particular 55 * row. A mix of the BaselineResizeBehavior 56 * constants (1 << ordinal()) */ 57 int maxAscent[]; /* Max ascent (baseline). */ 58 int maxDescent[]; /* Max descent (height - baseline) */ 59 60 /** 61 * Creates an instance of GridBagLayoutInfo representing {@code GridBagLayout} 62 * grid cells with it's own parameters. 63 * @param width the columns 64 * @param height the rows 65 * @since 1.6 66 */ 67 GridBagLayoutInfo(int width, int height) { 68 this.width = width; 69 this.height = height; 70 } 71 72 /** 73 * Returns true if the specified row has any component aligned on the 74 * baseline with a baseline resize behavior of CONSTANT_DESCENT. 75 */ 76 boolean hasConstantDescent(int row) { 77 return ((baselineType[row] & (1 << Component.BaselineResizeBehavior. 78 CONSTANT_DESCENT.ordinal())) != 0); 79 } 80 81 /** 82 * Returns true if there is a baseline for the specified row. 83 */ 84 boolean hasBaseline(int row) { 85 return (hasBaseline && baselineType[row] != 0); 86 } 87 }