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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   }

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