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129 lines
3.6 KiB
Java
129 lines
3.6 KiB
Java
/*
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* Copyright (c) 2006, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.awt;
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import java.io.Serial;
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/**
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* The {@code GridBagLayoutInfo} is an utility class for
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* {@code GridBagLayout} layout manager.
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* It stores align, size and baseline parameters for every component within a container.
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*
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* @see java.awt.GridBagLayout
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* @see java.awt.GridBagConstraints
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* @since 1.6
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*/
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public class GridBagLayoutInfo implements java.io.Serializable {
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/**
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* Use serialVersionUID from JDK 1.6 for interoperability.
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*/
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@Serial
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private static final long serialVersionUID = -4899416460737170217L;
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/**
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* The number of cells: horizontal and vertical.
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*/
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int width, height;
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/**
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* The starting point for layout.
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*/
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int startx, starty;
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/**
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* The largest minWidth in each column.
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*/
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int[] minWidth;
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/**
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* The largest minHeight in each row.
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*/
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int[] minHeight;
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/**
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* The largest weight in each column.
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*/
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double[] weightX;
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/**
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* The largest weight in each row.
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*/
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double[] weightY;
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/**
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* Whether or not baseline layout has been requested and one of the
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* components has a valid baseline.
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*/
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boolean hasBaseline;
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// These are only valid if hasBaseline is true and are indexed by
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// row.
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/**
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* The type of baseline for a particular row. A mix of the
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* BaselineResizeBehavior constants {@code (1 << ordinal())}
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*/
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short[] baselineType;
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/**
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* Max ascent (baseline).
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*/
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int[] maxAscent;
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/**
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* Max descent (height - baseline)
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*/
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int[] maxDescent;
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/**
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* Creates an instance of GridBagLayoutInfo representing {@code GridBagLayout}
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* grid cells with it's own parameters.
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* @param width the columns
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* @param height the rows
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* @since 1.6
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*/
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GridBagLayoutInfo(int width, int height) {
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this.width = width;
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this.height = height;
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}
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/**
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* Returns true if the specified row has any component aligned on the
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* baseline with a baseline resize behavior of CONSTANT_DESCENT.
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*/
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boolean hasConstantDescent(int row) {
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return ((baselineType[row] & (1 << Component.BaselineResizeBehavior.
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CONSTANT_DESCENT.ordinal())) != 0);
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}
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/**
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* Returns true if there is a baseline for the specified row.
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*/
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boolean hasBaseline(int row) {
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return (hasBaseline && baselineType[row] != 0);
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}
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}
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