GridBagLayoutInfo


1   package java.awt;
2   
3   /**
4    * The {@code GridBagLayoutInfo} is an utility class for 
5    * {@code GridBagLayout} layout manager.
6    * It stores align, size and baseline parameters for every component within a container.
7    * <p>
8    * @see       java.awt.GridBagLayout
9    * @see       java.awt.GridBagConstraints
10   * @since 1.6
11   */
12  public class GridBagLayoutInfo implements java.io.Serializable   {
13      /*
14       * serialVersionUID
15       */
16      private static final long serialVersionUID = -4899416460737170217L;
17  
18      int width, height;          /* number of  cells: horizontal and vertical */
19      int startx, starty;         /* starting point for layout */
20      int minWidth[];             /* largest minWidth in each column */
21      int minHeight[];            /* largest minHeight in each row */
22      double weightX[];           /* largest weight in each column */
23      double weightY[];           /* largest weight in each row */
24      boolean hasBaseline;        /* Whether or not baseline layout has been
25                                   * requested and one of the components
26                                   * has a valid baseline. */
27      // These are only valid if hasBaseline is true and are indexed by
28      // row.
29      short baselineType[];       /* The type of baseline for a particular
30                                   * row.  A mix of the BaselineResizeBehavior
31                                   * constants (1 << ordinal()) */
32      int maxAscent[];            /* Max ascent (baseline). */
33      int maxDescent[];           /* Max descent (height - baseline) */
34  
35      /**
36       * Creates an instance of GridBagLayoutInfo representing {@code GridBagLayout} 
37       * grid cells with it's own parameters.
38       * @param width the columns
39       * @param height the rows
40       * @since 6.0
41       */
42      GridBagLayoutInfo(int width, int height) {
43          this.width = width;
44          this.height = height;
45      }
46  
47      /**
48       * Returns true if the specified row has any component aligned on the
49       * baseline with a baseline resize behavior of CONSTANT_DESCENT.
50       */
51      boolean hasConstantDescent(int row) {
52          return ((baselineType[row] & (1 << Component.BaselineResizeBehavior.
53                                        CONSTANT_DESCENT.ordinal())) != 0);
54      }
55  
56      /**
57       * Returns true if there is a baseline for the specified row.
58       */
59      boolean hasBaseline(int row) {
60          return (hasBaseline && baselineType[row] != 0);
61      }
62  }
63
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