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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 23:38:51 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class JLayeredPane</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/JLayeredPane.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="../../javax/swing/JLabel.AccessibleJLabel.html"><B>PREV CLASS</B></A> <A HREF="../../javax/swing/JLayeredPane.AccessibleJLayeredPane.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="JLayeredPane.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#inner_class_summary">INNER</A> | <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">javax.swing</FONT><BR>Class JLayeredPane</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../java/awt/Component.html">java.awt.Component</A> | +--<A HREF="../../java/awt/Container.html">java.awt.Container</A> | +--<A HREF="../../javax/swing/JComponent.html">javax.swing.JComponent</A> | +--<B>javax.swing.JLayeredPane</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../javax/accessibility/Accessible.html">Accessible</A>, <A HREF="../../java/awt/image/ImageObserver.html">ImageObserver</A>, <A HREF="../../java/awt/MenuContainer.html">MenuContainer</A>, <A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../javax/swing/JDesktopPane.html">JDesktopPane</A></DD></DL><HR><DL><DT>public class <B>JLayeredPane</B><DT>extends <A HREF="../../javax/swing/JComponent.html">JComponent</A><DT>implements <A HREF="../../javax/accessibility/Accessible.html">Accessible</A></DL><P>JLayeredPane adds depth to a JFC/Swing container, allowing components to overlap each other when needed. An Integer object specifies each component's depth in the container, where higher-numbered components sit "on top" of other components. For task-oriented documentation and examples of using layered panes see <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/layeredpane.html">How to Use a Layered Pane</a>, a section in <em>The Java Tutorial</em>. <P> <TABLE ALIGN="RIGHT" BORDER="0"> <TR> <TD ALIGN="CENTER"> <P ALIGN="CENTER"><IMG SRC="doc-files/JLayeredPane-1.gif" WIDTH="269" HEIGHT="264" ALIGN="BOTTOM" BORDER="0"> </TD> </TR> </TABLE> For convenience, JLayeredPane divides the depth-range into several different layers. Putting a component into one of those layers makes it easy to ensure that components overlap properly, without having to worry about specifying numbers for specific depths: <DL> <DT><FONT SIZE="2">DEFAULT_LAYER</FONT></DT> <DD>The standard layer, where most components go. This the bottommost layer. <DT><FONT SIZE="2">PALETTE_LAYER</FONT></DT> <DD>The palette layer sits over the default layer. Useful for floating toolbars and palettes, so they can be positioned above other components. <DT><FONT SIZE="2">MODAL_LAYER</FONT></DT> <DD>The layer used for modal dialogs. They will appear on top of any toolbars, palettes, or standard components in the container. <DT><FONT SIZE="2">POPUP_LAYER</FONT></DT> <DD>The popup layer displays above dialogs. That way, the popup windows associated with combo boxes, tooltips, and other help text will appear above the component, palette, or dialog that generated them. <DT><FONT SIZE="2">DRAG_LAYER</FONT></DT> <DD>When dragging a component, reassigning it to the drag layer ensures that it is positioned over every other component in the container. When finished dragging, it can be reassigned to its normal layer. </DL> The JLayeredPane methods <code>moveToFront(Component)</code>, <code>moveToBack(Component)</code> and <code>setPosition</code> can be used to reposition a component within its layer. The <code>setLayer</code> method can also be used to change the component's current layer. <h2>Details</h2> JLayeredPane manages it's list of children like Container, but allows for the definition of a several layers within itself. Children in the same layer are managed exactly like the normal Container object, with the added feature that when children components overlap, children in higher layers display above the children in lower layers. <p> Each layer is a distinct integer number. The layer attribute can be set on a Component by passing an Integer object during the add call.<br> For example: <PRE> layeredPane.add(child, JLayeredPane.DEFAULT_LAYER); or layeredPane.add(child, new Integer(10)); </PRE> The layer attribute can also be set on a Component by calling<PRE> layeredPaneParent.setLayer(child, 10)</PRE> on the JLayeredPane that is the parent of component. The layer should be set <i>before</i> adding the child to the parent. <p> Higher number layers display above lower number layers. So, using numbers for the layers and letters for individual components, a representative list order would look like this:<PRE> 5a, 5b, 5c, 2a, 2b, 2c, 1a </PRE> where the leftmost components are closest to the top of the display. <p> A component can be moved to the top or bottom position within its layer by calling <code>moveToFront</code> or <code>moveToBack</code>. <p> The position of a component within a layer can also be specified directly. Valid positions range from 0 up to one less than the number of components in that layer. A value of -1 indicates the bottommost position. A value of 0 indicates the topmost position. Unlike layer numbers, higher position values are <i>lower</i> in the display. <blockquote> <b>Note:</b> This sequence (defined by java.awt.Container) is the reverse of the layer numbering sequence. Usually though, you will use <code>moveToFront</code>, <code>moveToBack</code>, and <code>setLayer</code>.⌨️ 快捷键说明
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