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1 /* |
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2 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package java.awt; |
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27 |
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28 /** |
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29 * The {@code GridBagLayoutInfo} is an utility class for |
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30 * {@code GridBagLayout} layout manager. |
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31 * It stores align, size and baseline parameters for every component within a container. |
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32 * <p> |
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33 * @see java.awt.GridBagLayout |
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34 * @see java.awt.GridBagConstraints |
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35 * @since 1.6 |
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36 */ |
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37 public class GridBagLayoutInfo implements java.io.Serializable { |
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38 /* |
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39 * serialVersionUID |
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40 */ |
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41 private static final long serialVersionUID = -4899416460737170217L; |
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42 |
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43 int width, height; /* number of cells: horizontal and vertical */ |
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44 int startx, starty; /* starting point for layout */ |
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45 int minWidth[]; /* largest minWidth in each column */ |
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46 int minHeight[]; /* largest minHeight in each row */ |
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47 double weightX[]; /* largest weight in each column */ |
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48 double weightY[]; /* largest weight in each row */ |
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49 boolean hasBaseline; /* Whether or not baseline layout has been |
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50 * requested and one of the components |
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51 * has a valid baseline. */ |
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52 // These are only valid if hasBaseline is true and are indexed by |
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53 // row. |
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54 short baselineType[]; /* The type of baseline for a particular |
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55 * row. A mix of the BaselineResizeBehavior |
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56 * constants (1 << ordinal()) */ |
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57 int maxAscent[]; /* Max ascent (baseline). */ |
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58 int maxDescent[]; /* Max descent (height - baseline) */ |
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59 |
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60 /** |
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61 * Creates an instance of GridBagLayoutInfo representing {@code GridBagLayout} |
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62 * grid cells with it's own parameters. |
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63 * @param width the columns |
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64 * @param height the rows |
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65 * @since 6.0 |
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66 */ |
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67 GridBagLayoutInfo(int width, int height) { |
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68 this.width = width; |
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69 this.height = height; |
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70 } |
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71 |
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72 /** |
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73 * Returns true if the specified row has any component aligned on the |
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74 * baseline with a baseline resize behavior of CONSTANT_DESCENT. |
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75 */ |
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76 boolean hasConstantDescent(int row) { |
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77 return ((baselineType[row] & (1 << Component.BaselineResizeBehavior. |
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78 CONSTANT_DESCENT.ordinal())) != 0); |
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79 } |
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80 |
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81 /** |
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82 * Returns true if there is a baseline for the specified row. |
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83 */ |
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84 boolean hasBaseline(int row) { |
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85 return (hasBaseline && baselineType[row] != 0); |
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86 } |
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87 } |