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| 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 | + * <p> | |
| 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 6.0 | |
| 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 | +} | |