01: /*
02: * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any 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.CONSTANT_DESCENT
78: .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: }
| 