borderlayout.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:32:17 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class BorderLayout</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/BorderLayout.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/awt/BasicStroke.html"><B>PREV CLASS</B></A> <A HREF="../../java/awt/Button.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="BorderLayout.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.awt</FONT><BR>Class BorderLayout</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.awt.BorderLayout</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/awt/LayoutManager.html">LayoutManager</A>, <A HREF="../../java/awt/LayoutManager2.html">LayoutManager2</A>, <A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><HR><DL><DT>public class <B>BorderLayout</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A><DT>implements <A HREF="../../java/awt/LayoutManager2.html">LayoutManager2</A>, <A HREF="../../java/io/Serializable.html">Serializable</A></DL><P>A border layout lays out a container, arranging and resizing its components to fit in five regions: north, south, east, west, and center. Each region is identified by a corresponding constant: <code>NORTH</code>, <code>SOUTH</code>, <code>EAST</code>, <code>WEST</code>, and <code>CENTER</code>. When adding a component to a container with a border layout, use one of these five constants, for example: <pre> Panel p = new Panel(); p.setLayout(new BorderLayout()); p.add(new Button("Okay"), BorderLayout.SOUTH); </pre> As a convenience, BorderLayout interprets the absence of a string specification the same as the constant <code>CENTER</code>: <pre> Panel p2 = new Panel(); p2.setLayout(new BorderLayout()); p2.add(new TextArea()); // Same as p.add(new TextArea(), BorderLayout.CENTER); </pre> <p> In addition, BorderLayout supports four relative positioning constants, <code>BEFORE_FIRST_LINE</code>, <code>AFTER_LAST_LINE</code>, <code>BEFORE_LINE_BEGINS</code>, and <code>AFTER_LINE_ENDS</code>. In a container whose ComponentOrientation is set to <code>ComponentOrientation.LEFT_TO_RIGHT</code>, these constants map to <code>NORTH</code>, <code>SOUTH</code>, <code>WEST</code>, and <code>EAST</code>, respectively <p> Mixing the two types of constants can lead to unpredicable results. If you use both types, the relative constants will take precedence. For example, if you add components using both the <code>NORTH</code> and <code>BEFORE_FIRST_LINE</code> constants in a container whose orientation is <code>LEFT_TO_RIGHT</code>, only the <code>BEFORE_FIRST_LINE</code> will be layed out. <p> NOTE: Currently (in the Java 2 platform v1.2), BorderLayout does not support vertical orientations. The <code>isVertical</code> setting on the container's ComponentOrientation is not respected. <p> The components are laid out according to their preferred sizes and the constraints of the container's size. The <code>NORTH</code> and <code>SOUTH</code> components may be stretched horizontally; the <code>EAST</code> and <code>WEST</code> components may be stretched vertically; the <code>CENTER</code> component may stretch both horizontally and vertically to fill any space left over. <p> Here is an example of five buttons in an applet laid out using the <code>BorderLayout</code> layout manager: <p> <img src="doc-files/BorderLayout-1.gif" ALIGN=center HSPACE=10 VSPACE=7> <p> The code for this applet is as follows: <p> <hr><blockquote><pre> import java.awt.*; import java.applet.Applet; public class buttonDir extends Applet { public void init() { setLayout(new BorderLayout()); add(new Button("North"), BorderLayout.NORTH); add(new Button("South"), BorderLayout.SOUTH); add(new Button("East"), BorderLayout.EAST); add(new Button("West"), BorderLayout.WEST); add(new Button("Center"), BorderLayout.CENTER); } } </pre></blockquote><hr> <p><P><DL><DT><B>Since: </B><DD>JDK1.0</DD><DT><B>See Also: </B><DD><A HREF="../../java/awt/Container.html#add(java.lang.String, java.awt.Component)"><CODE>Container.add(String, Component)</CODE></A>, <A HREF="../../java/awt/ComponentOrientation.html"><CODE>ComponentOrientation</CODE></A>, <A HREF="../../serialized-form.html#java.awt.BorderLayout">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#AFTER_LAST_LINE">AFTER_LAST_LINE</A></B></CODE><BR> The component comes after the last line of the layout's content.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#AFTER_LINE_ENDS">AFTER_LINE_ENDS</A></B></CODE><BR> The component goes at the end of the line direction for the layout.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#BEFORE_FIRST_LINE">BEFORE_FIRST_LINE</A></B></CODE><BR> The component comes before the first line of the layout's content.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#BEFORE_LINE_BEGINS">BEFORE_LINE_BEGINS</A></B></CODE><BR> The component goes at the beginning of the line direction for the layout.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#CENTER">CENTER</A></B></CODE><BR> The center layout constraint (middle of container).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#EAST">EAST</A></B></CODE><BR> The east layout constraint (right side of container).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#NORTH">NORTH</A></B></CODE><BR> The north layout constraint (top of container).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#SOUTH">SOUTH</A></B></CODE><BR> The south layout constraint (bottom of container).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#WEST">WEST</A></B></CODE><BR> The west layout constraint (left side of container).</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#BorderLayout()">BorderLayout</A></B>()</CODE><BR> Constructs a new border layout with no gaps between components.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#BorderLayout(int, int)">BorderLayout</A></B>(int hgap, int vgap)</CODE><BR> Constructs a border layout with the specified gaps between components.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#addLayoutComponent(java.awt.Component, java.lang.Object)">addLayoutComponent</A></B>(<A HREF="../../java/awt/Component.html">Component</A> comp, <A HREF="../../java/lang/Object.html">Object</A> constraints)</CODE><BR> Adds the specified component to the layout, using the specified constraint object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/BorderLayout.html#addLayoutComponent(java.lang.String, java.awt.Component)">addLayoutComponent</A></B>(<A HREF="../../java/lang/String.html">String</A> name, <A HREF="../../java/awt/Component.html">Component</A> comp)</CODE><BR> Adds the specified component with the specified name to the layout.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor">⌨️ 快捷键说明
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