📄 zoneview.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 23:42:27 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class ZoneView</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/ZoneView.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/text/WrappedPlainView.html"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="ZoneView.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#fields_inherited_from_class_javax.swing.text.View">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: FIELD | <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.text</FONT><BR>Class ZoneView</H2><PRE><A HREF="../../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../../javax/swing/text/View.html">javax.swing.text.View</A> | +--<A HREF="../../../javax/swing/text/CompositeView.html">javax.swing.text.CompositeView</A> | +--<A HREF="../../../javax/swing/text/BoxView.html">javax.swing.text.BoxView</A> | +--<B>javax.swing.text.ZoneView</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../javax/swing/SwingConstants.html">SwingConstants</A></DD></DL><HR><DL><DT>public class <B>ZoneView</B><DT>extends <A HREF="../../../javax/swing/text/BoxView.html">BoxView</A></DL><P>ZoneView is a View implementation that creates zones for which the child views are not created or stored until they are needed for display or model/view translations. This enables a substantial reduction in memory consumption for situations where the model being represented is very large, by building view objects only for the region being actively viewed/edited. The size of the children can be estimated in some way, or calculated asynchronously with only the result being saved. <p> ZoneView extends BoxView to provide a box that implements zones for it's children. The zones are special View implementations (the children of an instance of this class) that represent only a portion of the model that an instance of ZoneView is responsible for. The zones don't create child views until an attempt is made to display them. A box shaped view is well suited to this because: <ul> <li> Boxes are a heavily used view, and having a box that provides this behavior gives substantial opportunity to plug the behavior into a view hierarchy from the view factory. <li> Boxes are tiled in one direction, so it is easy to divide them into zones in a reliable way. <li> Boxes typically have a simple relationship to the model (i.e. they create child views that directly represent the child elements). <li> Boxes are easier to estimate the size of than some other shapes. </ul> <p> The default behavior is controled by two properties, maxZoneSize and maxZonesLoaded. Setting maxZoneSize to Integer.MAX_VALUE would have the effect of causing only one zone to be created. This would effectively turn the view into an implementation of the decorator pattern. Setting maxZonesLoaded to a value of Integer.MAX_VALUE would cause zones to never be unloaded. For simplicity, zones are created on boundaries represented by the child elements of the element the view is responsible for. The zones can be any View implementation, but the default implementation is based upon AsyncBoxView which supports fairly large zones efficiently.<P><DL><DT><B>Since: </B><DD>1.3</DD><DT><B>See Also: </B><DD><A HREF="../../../javax/swing/text/View.html"><CODE>View</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_javax.swing.text.View"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.swing.text.<A HREF="../../../javax/swing/text/View.html">View</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/swing/text/View.html#BadBreakWeight">BadBreakWeight</A>, <A HREF="../../../javax/swing/text/View.html#ExcellentBreakWeight">ExcellentBreakWeight</A>, <A HREF="../../../javax/swing/text/View.html#ForcedBreakWeight">ForcedBreakWeight</A>, <A HREF="../../../javax/swing/text/View.html#GoodBreakWeight">GoodBreakWeight</A>, <A HREF="../../../javax/swing/text/View.html#X_AXIS">X_AXIS</A>, <A HREF="../../../javax/swing/text/View.html#Y_AXIS">Y_AXIS</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.swing.SwingConstants"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface javax.swing.<A HREF="../../../javax/swing/SwingConstants.html">SwingConstants</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/swing/SwingConstants.html#BOTTOM">BOTTOM</A>, <A HREF="../../../javax/swing/SwingConstants.html#CENTER">CENTER</A>, <A HREF="../../../javax/swing/SwingConstants.html#EAST">EAST</A>, <A HREF="../../../javax/swing/SwingConstants.html#HORIZONTAL">HORIZONTAL</A>, <A HREF="../../../javax/swing/SwingConstants.html#LEADING">LEADING</A>, <A HREF="../../../javax/swing/SwingConstants.html#LEFT">LEFT</A>, <A HREF="../../../javax/swing/SwingConstants.html#NORTH">NORTH</A>, <A HREF="../../../javax/swing/SwingConstants.html#NORTH_EAST">NORTH_EAST</A>, <A HREF="../../../javax/swing/SwingConstants.html#NORTH_WEST">NORTH_WEST</A>, <A HREF="../../../javax/swing/SwingConstants.html#RIGHT">RIGHT</A>, <A HREF="../../../javax/swing/SwingConstants.html#SOUTH">SOUTH</A>, <A HREF="../../../javax/swing/SwingConstants.html#SOUTH_EAST">SOUTH_EAST</A>, <A HREF="../../../javax/swing/SwingConstants.html#SOUTH_WEST">SOUTH_WEST</A>, <A HREF="../../../javax/swing/SwingConstants.html#TOP">TOP</A>, <A HREF="../../../javax/swing/SwingConstants.html#TRAILING">TRAILING</A>, <A HREF="../../../javax/swing/SwingConstants.html#VERTICAL">VERTICAL</A>, <A HREF="../../../javax/swing/SwingConstants.html#WEST">WEST</A></CODE></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="../../../javax/swing/text/ZoneView.html#ZoneView(javax.swing.text.Element, int)">ZoneView</A></B>(<A HREF="../../../javax/swing/text/Element.html">Element</A> elem, int axis)</CODE><BR> Constructs a ZoneView.</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>protected <A HREF="../../../javax/swing/text/View.html">View</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/text/ZoneView.html#createZone(int, int)">createZone</A></B>(int p0, int p1)</CODE><BR> Create a view to represent a zone for the given range within the model (which should be within the range of this objects responsibility).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/text/ZoneView.html#getMaximumZoneSize()">getMaximumZoneSize</A></B>()</CODE><BR> Get the current maximum zone size.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/text/ZoneView.html#getMaxZonesLoaded()">getMaxZonesLoaded</A></B>()</CODE><BR> Get the current setting of the number of zones allowed to be loaded at the same time.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/text/ZoneView.html#getViewIndexAtPosition(int)">getViewIndexAtPosition</A></B>(int pos)</CODE><BR> Fetches the child view index representing the given position in the model.</TD>⌨️ 快捷键说明
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