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/*
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* Copyright 1995-2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.awt;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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/**
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* A flow layout arranges components in a directional flow, much
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* like lines of text in a paragraph. The flow direction is
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* determined by the container's <code>componentOrientation</code>
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* property and may be one of two values:
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* <ul>
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* <li><code>ComponentOrientation.LEFT_TO_RIGHT</code>
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* <li><code>ComponentOrientation.RIGHT_TO_LEFT</code>
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* </ul>
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* Flow layouts are typically used
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* to arrange buttons in a panel. It arranges buttons
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* horizontally until no more buttons fit on the same line.
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* The line alignment is determined by the <code>align</code>
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* property. The possible values are:
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* <ul>
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* <li>{@link #LEFT LEFT}
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* <li>{@link #RIGHT RIGHT}
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* <li>{@link #CENTER CENTER}
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* <li>{@link #LEADING LEADING}
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* <li>{@link #TRAILING TRAILING}
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* </ul>
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* <p>
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* For example, the following picture shows an applet using the flow
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* layout manager (its default layout manager) to position three buttons:
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* <p>
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* <img src="doc-files/FlowLayout-1.gif"
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* ALT="Graphic of Layout for Three Buttons"
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* ALIGN=center HSPACE=10 VSPACE=7>
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* <p>
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* Here is the code for this applet:
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* <p>
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* <hr><blockquote><pre>
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* import java.awt.*;
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* import java.applet.Applet;
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*
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* public class myButtons extends Applet {
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* Button button1, button2, button3;
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* public void init() {
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* button1 = new Button("Ok");
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* button2 = new Button("Open");
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* button3 = new Button("Close");
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* add(button1);
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* add(button2);
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* add(button3);
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* }
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* }
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* </pre></blockquote><hr>
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* <p>
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* A flow layout lets each component assume its natural (preferred) size.
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*
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* @author Arthur van Hoff
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* @author Sami Shaio
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* @since JDK1.0
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* @see ComponentOrientation
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*/
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public class FlowLayout implements LayoutManager, java.io.Serializable {
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/**
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* This value indicates that each row of components
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* should be left-justified.
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*/
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public static final int LEFT = 0;
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/**
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* This value indicates that each row of components
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* should be centered.
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*/
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public static final int CENTER = 1;
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/**
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* This value indicates that each row of components
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* should be right-justified.
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*/
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public static final int RIGHT = 2;
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/**
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* This value indicates that each row of components
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* should be justified to the leading edge of the container's
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* orientation, for example, to the left in left-to-right orientations.
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*
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* @see java.awt.Component#getComponentOrientation
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* @see java.awt.ComponentOrientation
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* @since 1.2
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*/
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public static final int LEADING = 3;
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/**
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* This value indicates that each row of components
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* should be justified to the trailing edge of the container's
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* orientation, for example, to the right in left-to-right orientations.
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*
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* @see java.awt.Component#getComponentOrientation
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* @see java.awt.ComponentOrientation
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* @since 1.2
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*/
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public static final int TRAILING = 4;
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/**
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* <code>align</code> is the property that determines
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* how each row distributes empty space.
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* It can be one of the following values:
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* <ul>
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* <code>LEFT</code>
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* <code>RIGHT</code>
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* <code>CENTER</code>
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* </ul>
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*
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* @serial
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* @see #getAlignment
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* @see #setAlignment
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*/
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int align; // This is for 1.1 serialization compatibility
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/**
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* <code>newAlign</code> is the property that determines
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* how each row distributes empty space for the Java 2 platform,
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* v1.2 and greater.
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* It can be one of the following three values:
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* <ul>
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* <code>LEFT</code>
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* <code>RIGHT</code>
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* <code>CENTER</code>
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* <code>LEADING</code>
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* <code>TRAILING</code>
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* </ul>
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*
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* @serial
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* @since 1.2
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* @see #getAlignment
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* @see #setAlignment
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*/
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int newAlign; // This is the one we actually use
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/**
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* The flow layout manager allows a seperation of
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* components with gaps. The horizontal gap will
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* specify the space between components and between
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* the components and the borders of the
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* <code>Container</code>.
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*
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* @serial
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* @see #getHgap()
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* @see #setHgap(int)
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*/
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int hgap;
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/**
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* The flow layout manager allows a seperation of
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* components with gaps. The vertical gap will
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* specify the space between rows and between the
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* the rows and the borders of the <code>Container</code>.
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*
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* @serial
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* @see #getHgap()
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* @see #setHgap(int)
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*/
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int vgap;
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/**
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* If true, components will be aligned on their baseline.
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*/
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private boolean alignOnBaseline;
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/*
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* JDK 1.1 serialVersionUID
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*/
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private static final long serialVersionUID = -7262534875583282631L;
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/**
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* Constructs a new <code>FlowLayout</code> with a centered alignment and a
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* default 5-unit horizontal and vertical gap.
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*/
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public FlowLayout() {
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this(CENTER, 5, 5);
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}
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/**
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* Constructs a new <code>FlowLayout</code> with the specified
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* alignment and a default 5-unit horizontal and vertical gap.
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* The value of the alignment argument must be one of
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* <code>FlowLayout.LEFT</code>, <code>FlowLayout.RIGHT</code>,
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* <code>FlowLayout.CENTER</code>, <code>FlowLayout.LEADING</code>,
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* or <code>FlowLayout.TRAILING</code>.
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* @param align the alignment value
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*/
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public FlowLayout(int align) {
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this(align, 5, 5);
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}
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/**
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* Creates a new flow layout manager with the indicated alignment
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* and the indicated horizontal and vertical gaps.
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* <p>
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* The value of the alignment argument must be one of
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* <code>FlowLayout.LEFT</code>, <code>FlowLayout.RIGHT</code>,
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* <code>FlowLayout.CENTER</code>, <code>FlowLayout.LEADING</code>,
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* or <code>FlowLayout.TRAILING</code>.
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* @param align the alignment value
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* @param hgap the horizontal gap between components
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* and between the components and the
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* borders of the <code>Container</code>
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* @param vgap the vertical gap between components
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* and between the components and the
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* borders of the <code>Container</code>
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*/
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public FlowLayout(int align, int hgap, int vgap) {
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this.hgap = hgap;
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this.vgap = vgap;
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setAlignment(align);
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}
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/**
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* Gets the alignment for this layout.
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* Possible values are <code>FlowLayout.LEFT</code>,
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* <code>FlowLayout.RIGHT</code>, <code>FlowLayout.CENTER</code>,
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* <code>FlowLayout.LEADING</code>,
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* or <code>FlowLayout.TRAILING</code>.
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* @return the alignment value for this layout
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* @see java.awt.FlowLayout#setAlignment
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* @since JDK1.1
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*/
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public int getAlignment() {
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return newAlign;
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}
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/**
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* Sets the alignment for this layout.
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* Possible values are
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* <ul>
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* <li><code>FlowLayout.LEFT</code>
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* <li><code>FlowLayout.RIGHT</code>
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* <li><code>FlowLayout.CENTER</code>
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* <li><code>FlowLayout.LEADING</code>
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* <li><code>FlowLayout.TRAILING</code>
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* </ul>
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* @param align one of the alignment values shown above
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* @see #getAlignment()
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* @since JDK1.1
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*/
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public void setAlignment(int align) {
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this.newAlign = align;
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// this.align is used only for serialization compatibility,
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// so set it to a value compatible with the 1.1 version
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// of the class
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switch (align) {
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case LEADING:
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this.align = LEFT;
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break;
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case TRAILING:
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this.align = RIGHT;
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break;
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default:
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this.align = align;
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break;
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}
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}
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/**
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* Gets the horizontal gap between components
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* and between the components and the borders
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* of the <code>Container</code>
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*
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* @return the horizontal gap between components
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* and between the components and the borders
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* of the <code>Container</code>
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* @see java.awt.FlowLayout#setHgap
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* @since JDK1.1
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*/
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public int getHgap() {
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return hgap;
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}
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/**
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* Sets the horizontal gap between components and
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* between the components and the borders of the
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* <code>Container</code>.
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*
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* @param hgap the horizontal gap between components
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* and between the components and the borders
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* of the <code>Container</code>
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* @see java.awt.FlowLayout#getHgap
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* @since JDK1.1
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*/
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public void setHgap(int hgap) {
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this.hgap = hgap;
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}
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/**
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* Gets the vertical gap between components and
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* between the components and the borders of the
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* <code>Container</code>.
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*
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* @return the vertical gap between components
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* and between the components and the borders
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* of the <code>Container</code>
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* @see java.awt.FlowLayout#setVgap
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* @since JDK1.1
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*/
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public int getVgap() {
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return vgap;
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}
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/**
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* Sets the vertical gap between components and between
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* the components and the borders of the <code>Container</code>.
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*
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* @param vgap the vertical gap between components
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* and between the components and the borders
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* of the <code>Container</code>
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* @see java.awt.FlowLayout#getVgap
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* @since JDK1.1
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*/
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public void setVgap(int vgap) {
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this.vgap = vgap;
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}
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/**
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* Sets whether or not components should be vertically aligned along their
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* baseline. Components that do not have a baseline will be centered.
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* The default is false.
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*
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* @param alignOnBaseline whether or not components should be
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* vertically aligned on their baseline
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* @since 1.6
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*/
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public void setAlignOnBaseline(boolean alignOnBaseline) {
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this.alignOnBaseline = alignOnBaseline;
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}
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/**
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* Returns true if components are to be vertically aligned along
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* their baseline. The default is false.
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*
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* @return true if components are to be vertically aligned along
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* their baseline
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* @since 1.6
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*/
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public boolean getAlignOnBaseline() {
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return alignOnBaseline;
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}
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/**
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* Adds the specified component to the layout.
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* Not used by this class.
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* @param name the name of the component
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* @param comp the component to be added
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*/
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public void addLayoutComponent(String name, Component comp) {
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}
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/**
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* Removes the specified component from the layout.
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* Not used by this class.
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* @param comp the component to remove
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* @see java.awt.Container#removeAll
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*/
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public void removeLayoutComponent(Component comp) {
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}
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/**
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* Returns the preferred dimensions for this layout given the
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* <i>visible</i> components in the specified target container.
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*
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* @param target the container that needs to be laid out
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* @return the preferred dimensions to lay out the
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* subcomponents of the specified container
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* @see Container
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* @see #minimumLayoutSize
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* @see java.awt.Container#getPreferredSize
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*/
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public Dimension preferredLayoutSize(Container target) {
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synchronized (target.getTreeLock()) {
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Dimension dim = new Dimension(0, 0);
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int nmembers = target.getComponentCount();
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boolean firstVisibleComponent = true;
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boolean useBaseline = getAlignOnBaseline();
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int maxAscent = 0;
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int maxDescent = 0;
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for (int i = 0 ; i < nmembers ; i++) {
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Component m = target.getComponent(i);
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if (m.isVisible()) {
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Dimension d = m.getPreferredSize();
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dim.height = Math.max(dim.height, d.height);
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if (firstVisibleComponent) {
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firstVisibleComponent = false;
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} else {
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dim.width += hgap;
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}
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dim.width += d.width;
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if (useBaseline) {
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int baseline = m.getBaseline(d.width, d.height);
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if (baseline >= 0) {
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maxAscent = Math.max(maxAscent, baseline);
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maxDescent = Math.max(maxDescent, d.height - baseline);
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}
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}
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}
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}
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if (useBaseline) {
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dim.height = Math.max(maxAscent + maxDescent, dim.height);
|
|
433 |
}
|
|
434 |
Insets insets = target.getInsets();
|
|
435 |
dim.width += insets.left + insets.right + hgap*2;
|
|
436 |
dim.height += insets.top + insets.bottom + vgap*2;
|
|
437 |
return dim;
|
|
438 |
}
|
|
439 |
}
|
|
440 |
|
|
441 |
/**
|
|
442 |
* Returns the minimum dimensions needed to layout the <i>visible</i>
|
|
443 |
* components contained in the specified target container.
|
|
444 |
* @param target the container that needs to be laid out
|
|
445 |
* @return the minimum dimensions to lay out the
|
|
446 |
* subcomponents of the specified container
|
|
447 |
* @see #preferredLayoutSize
|
|
448 |
* @see java.awt.Container
|
|
449 |
* @see java.awt.Container#doLayout
|
|
450 |
*/
|
|
451 |
public Dimension minimumLayoutSize(Container target) {
|
|
452 |
synchronized (target.getTreeLock()) {
|
|
453 |
boolean useBaseline = getAlignOnBaseline();
|
|
454 |
Dimension dim = new Dimension(0, 0);
|
|
455 |
int nmembers = target.getComponentCount();
|
|
456 |
int maxAscent = 0;
|
|
457 |
int maxDescent = 0;
|
|
458 |
boolean firstVisibleComponent = true;
|
|
459 |
|
|
460 |
for (int i = 0 ; i < nmembers ; i++) {
|
|
461 |
Component m = target.getComponent(i);
|
|
462 |
if (m.visible) {
|
|
463 |
Dimension d = m.getMinimumSize();
|
|
464 |
dim.height = Math.max(dim.height, d.height);
|
|
465 |
if (firstVisibleComponent) {
|
|
466 |
firstVisibleComponent = false;
|
|
467 |
} else {
|
|
468 |
dim.width += hgap;
|
|
469 |
}
|
|
470 |
dim.width += d.width;
|
|
471 |
if (useBaseline) {
|
|
472 |
int baseline = m.getBaseline(d.width, d.height);
|
|
473 |
if (baseline >= 0) {
|
|
474 |
maxAscent = Math.max(maxAscent, baseline);
|
|
475 |
maxDescent = Math.max(maxDescent,
|
|
476 |
dim.height - baseline);
|
|
477 |
}
|
|
478 |
}
|
|
479 |
}
|
|
480 |
}
|
|
481 |
|
|
482 |
if (useBaseline) {
|
|
483 |
dim.height = Math.max(maxAscent + maxDescent, dim.height);
|
|
484 |
}
|
|
485 |
|
|
486 |
Insets insets = target.getInsets();
|
|
487 |
dim.width += insets.left + insets.right + hgap*2;
|
|
488 |
dim.height += insets.top + insets.bottom + vgap*2;
|
|
489 |
return dim;
|
|
490 |
|
|
491 |
|
|
492 |
|
|
493 |
|
|
494 |
|
|
495 |
}
|
|
496 |
}
|
|
497 |
|
|
498 |
/**
|
|
499 |
* Centers the elements in the specified row, if there is any slack.
|
|
500 |
* @param target the component which needs to be moved
|
|
501 |
* @param x the x coordinate
|
|
502 |
* @param y the y coordinate
|
|
503 |
* @param width the width dimensions
|
|
504 |
* @param height the height dimensions
|
|
505 |
* @param rowStart the beginning of the row
|
|
506 |
* @param rowEnd the the ending of the row
|
|
507 |
* @param useBaseline Whether or not to align on baseline.
|
|
508 |
* @param ascent Ascent for the components. This is only valid if
|
|
509 |
* useBaseline is true.
|
|
510 |
* @param descent Ascent for the components. This is only valid if
|
|
511 |
* useBaseline is true.
|
|
512 |
* @return actual row height
|
|
513 |
*/
|
|
514 |
private int moveComponents(Container target, int x, int y, int width, int height,
|
|
515 |
int rowStart, int rowEnd, boolean ltr,
|
|
516 |
boolean useBaseline, int[] ascent,
|
|
517 |
int[] descent) {
|
|
518 |
switch (newAlign) {
|
|
519 |
case LEFT:
|
|
520 |
x += ltr ? 0 : width;
|
|
521 |
break;
|
|
522 |
case CENTER:
|
|
523 |
x += width / 2;
|
|
524 |
break;
|
|
525 |
case RIGHT:
|
|
526 |
x += ltr ? width : 0;
|
|
527 |
break;
|
|
528 |
case LEADING:
|
|
529 |
break;
|
|
530 |
case TRAILING:
|
|
531 |
x += width;
|
|
532 |
break;
|
|
533 |
}
|
|
534 |
int maxAscent = 0;
|
|
535 |
int nonbaselineHeight = 0;
|
|
536 |
int baselineOffset = 0;
|
|
537 |
if (useBaseline) {
|
|
538 |
int maxDescent = 0;
|
|
539 |
for (int i = rowStart ; i < rowEnd ; i++) {
|
|
540 |
Component m = target.getComponent(i);
|
|
541 |
if (m.visible) {
|
|
542 |
if (ascent[i] >= 0) {
|
|
543 |
maxAscent = Math.max(maxAscent, ascent[i]);
|
|
544 |
maxDescent = Math.max(maxDescent, descent[i]);
|
|
545 |
}
|
|
546 |
else {
|
|
547 |
nonbaselineHeight = Math.max(m.getHeight(),
|
|
548 |
nonbaselineHeight);
|
|
549 |
}
|
|
550 |
}
|
|
551 |
}
|
|
552 |
height = Math.max(maxAscent + maxDescent, nonbaselineHeight);
|
|
553 |
baselineOffset = (height - maxAscent - maxDescent) / 2;
|
|
554 |
}
|
|
555 |
for (int i = rowStart ; i < rowEnd ; i++) {
|
|
556 |
Component m = target.getComponent(i);
|
|
557 |
if (m.isVisible()) {
|
|
558 |
int cy;
|
|
559 |
if (useBaseline && ascent[i] >= 0) {
|
|
560 |
cy = y + baselineOffset + maxAscent - ascent[i];
|
|
561 |
}
|
|
562 |
else {
|
|
563 |
cy = y + (height - m.height) / 2;
|
|
564 |
}
|
|
565 |
if (ltr) {
|
|
566 |
m.setLocation(x, cy);
|
|
567 |
} else {
|
|
568 |
m.setLocation(target.width - x - m.width, cy);
|
|
569 |
}
|
|
570 |
x += m.width + hgap;
|
|
571 |
}
|
|
572 |
}
|
|
573 |
return height;
|
|
574 |
}
|
|
575 |
|
|
576 |
/**
|
|
577 |
* Lays out the container. This method lets each
|
|
578 |
* <i>visible</i> component take
|
|
579 |
* its preferred size by reshaping the components in the
|
|
580 |
* target container in order to satisfy the alignment of
|
|
581 |
* this <code>FlowLayout</code> object.
|
|
582 |
*
|
|
583 |
* @param target the specified component being laid out
|
|
584 |
* @see Container
|
|
585 |
* @see java.awt.Container#doLayout
|
|
586 |
*/
|
|
587 |
public void layoutContainer(Container target) {
|
|
588 |
synchronized (target.getTreeLock()) {
|
|
589 |
Insets insets = target.getInsets();
|
|
590 |
int maxwidth = target.width - (insets.left + insets.right + hgap*2);
|
|
591 |
int nmembers = target.getComponentCount();
|
|
592 |
int x = 0, y = insets.top + vgap;
|
|
593 |
int rowh = 0, start = 0;
|
|
594 |
|
|
595 |
boolean ltr = target.getComponentOrientation().isLeftToRight();
|
|
596 |
|
|
597 |
boolean useBaseline = getAlignOnBaseline();
|
|
598 |
int[] ascent = null;
|
|
599 |
int[] descent = null;
|
|
600 |
|
|
601 |
if (useBaseline) {
|
|
602 |
ascent = new int[nmembers];
|
|
603 |
descent = new int[nmembers];
|
|
604 |
}
|
|
605 |
|
|
606 |
for (int i = 0 ; i < nmembers ; i++) {
|
|
607 |
Component m = target.getComponent(i);
|
|
608 |
if (m.isVisible()) {
|
|
609 |
Dimension d = m.getPreferredSize();
|
|
610 |
m.setSize(d.width, d.height);
|
|
611 |
|
|
612 |
if (useBaseline) {
|
|
613 |
int baseline = m.getBaseline(d.width, d.height);
|
|
614 |
if (baseline >= 0) {
|
|
615 |
ascent[i] = baseline;
|
|
616 |
descent[i] = d.height - baseline;
|
|
617 |
}
|
|
618 |
else {
|
|
619 |
ascent[i] = -1;
|
|
620 |
}
|
|
621 |
}
|
|
622 |
if ((x == 0) || ((x + d.width) <= maxwidth)) {
|
|
623 |
if (x > 0) {
|
|
624 |
x += hgap;
|
|
625 |
}
|
|
626 |
x += d.width;
|
|
627 |
rowh = Math.max(rowh, d.height);
|
|
628 |
} else {
|
|
629 |
rowh = moveComponents(target, insets.left + hgap, y,
|
|
630 |
maxwidth - x, rowh, start, i, ltr,
|
|
631 |
useBaseline, ascent, descent);
|
|
632 |
x = d.width;
|
|
633 |
y += vgap + rowh;
|
|
634 |
rowh = d.height;
|
|
635 |
start = i;
|
|
636 |
}
|
|
637 |
}
|
|
638 |
}
|
|
639 |
moveComponents(target, insets.left + hgap, y, maxwidth - x, rowh,
|
|
640 |
start, nmembers, ltr, useBaseline, ascent, descent);
|
|
641 |
}
|
|
642 |
}
|
|
643 |
|
|
644 |
//
|
|
645 |
// the internal serial version which says which version was written
|
|
646 |
// - 0 (default) for versions before the Java 2 platform, v1.2
|
|
647 |
// - 1 for version >= Java 2 platform v1.2, which includes "newAlign" field
|
|
648 |
//
|
|
649 |
private static final int currentSerialVersion = 1;
|
|
650 |
/**
|
|
651 |
* This represent the <code>currentSerialVersion</code>
|
|
652 |
* which is bein used. It will be one of two values :
|
|
653 |
* <code>0</code> versions before Java 2 platform v1.2..
|
|
654 |
* <code>1</code> versions after Java 2 platform v1.2..
|
|
655 |
*
|
|
656 |
* @serial
|
|
657 |
* @since 1.2
|
|
658 |
*/
|
|
659 |
private int serialVersionOnStream = currentSerialVersion;
|
|
660 |
|
|
661 |
/**
|
|
662 |
* Reads this object out of a serialization stream, handling
|
|
663 |
* objects written by older versions of the class that didn't contain all
|
|
664 |
* of the fields we use now..
|
|
665 |
*/
|
|
666 |
private void readObject(ObjectInputStream stream)
|
|
667 |
throws IOException, ClassNotFoundException
|
|
668 |
{
|
|
669 |
stream.defaultReadObject();
|
|
670 |
|
|
671 |
if (serialVersionOnStream < 1) {
|
|
672 |
// "newAlign" field wasn't present, so use the old "align" field.
|
|
673 |
setAlignment(this.align);
|
|
674 |
}
|
|
675 |
serialVersionOnStream = currentSerialVersion;
|
|
676 |
}
|
|
677 |
|
|
678 |
/**
|
|
679 |
* Returns a string representation of this <code>FlowLayout</code>
|
|
680 |
* object and its values.
|
|
681 |
* @return a string representation of this layout
|
|
682 |
*/
|
|
683 |
public String toString() {
|
|
684 |
String str = "";
|
|
685 |
switch (align) {
|
|
686 |
case LEFT: str = ",align=left"; break;
|
|
687 |
case CENTER: str = ",align=center"; break;
|
|
688 |
case RIGHT: str = ",align=right"; break;
|
|
689 |
case LEADING: str = ",align=leading"; break;
|
|
690 |
case TRAILING: str = ",align=trailing"; break;
|
|
691 |
}
|
|
692 |
return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + str + "]";
|
|
693 |
}
|
|
694 |
|
|
695 |
|
|
696 |
}
|