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document.getElementById("ToggleLeft").blur(); } function load() { showLeft(leftBar()); document.getElementById("ToggleLeft").style.display="inline"; } </script> </head><body onload="load()"> <div id=TopBar> <div id=TopBar_tr> <div id=TopBar_tl> <div id=TopBar_br> <div id=TopBar_bl> <div id=TopBar_right> <a target="_blank" href="http://java.sun.com/javase/6/download.jsp">Download the JDK</a> <br> <a href="../../search.html" target="_blank">Search the Tutorials</a> <br> <a href="javascript:toggleLeft()" id="ToggleLeft">Hide the TOC</a> </div> </div> </div> </div> </div> </div> <div class=PrintHeaders> <b>Trail:</b> Creating a GUI with JFC/Swing <br><b>Lesson:</b> Writing Event Listeners <br><b>Section:</b> Implementing Listeners for Commonly Handled Events </div> <div id=LeftBar class=LeftBar_shown> <div id=Contents> <div class="linkLESSON"><a href="index.html">Writing Event Listeners</a></div><div class="linkAHEAD"><a href="intro.html">Introduction to Event Listeners</a></div><div class="linkAHEAD"><a href="generalrules.html">General Information about Writing Event Listeners</a></div><div class="linkAHEAD"><a href="eventsandcomponents.html">Listeners Supported by Swing Components</a></div><div class="linkAHEAD"><a href="handling.html">Implementing Listeners for Commonly Handled Events</a></div><div class="linkBHEAD"><a href="actionlistener.html">How to Write an Action Listener</a></div><div class="linkBHEAD"><a href="caretlistener.html">How to Write a Caret Listener</a></div><div class="linkBHEAD"><a href="changelistener.html">How to Write a Change Listener</a></div><div class="linkBHEAD"><a href="componentlistener.html">How to Write a Component Listener</a></div><div class="linkBHEAD"><a href="containerlistener.html">How to Write a Container Listener</a></div><div class="linkBHEAD"><a href="documentlistener.html">How to Write a Document Listener</a></div><div class="linkBHEAD"><a href="focuslistener.html">How to Write a Focus Listener</a></div><div class="linkBHEAD"><a href="internalframelistener.html">How to Write an Internal Frame Listener</a></div><div class="linkBHEAD"><a href="itemlistener.html">How to Write an Item Listener</a></div><div class="linkBHEAD"><a href="keylistener.html">How to Write a Key Listener</a></div><div class="linkBHEAD"><a href="listdatalistener.html">How to Write a List Data Listener</a></div><div class="linkBHEAD"><a href="listselectionlistener.html">How to Write a List Selection Listener</a></div><div class="linkBHEAD"><a href="mouselistener.html">How to Write a Mouse Listener</a></div><div class="linkBHEAD"><a href="mousemotionlistener.html">How to Write a Mouse-Motion Listener</a></div><div class="linkBHEAD"><a href="mousewheellistener.html">How to Write a Mouse-Wheel Listener</a></div><div class="linkBHEAD"><a href="propertychangelistener.html">How to Write a Property Change Listener</a></div><div class="linkBHEAD"><a href="tablemodellistener.html">How to Write a Table Model Listener</a></div><div class="linkBHEAD"><a href="treeexpansionlistener.html">How to Write a Tree Expansion Listener</a></div><div class="nolinkBHEAD">How to Write a Tree Model Listener</div><div class="linkBHEAD"><a href="treeselectionlistener.html">How to Write a Tree Selection Listener</a></div><div class="linkBHEAD"><a href="treewillexpandlistener.html">How to Write a Tree-Will-Expand Listener</a></div><div class="linkBHEAD"><a href="undoableeditlistener.html">How to Write an Undoable Edit Listener</a></div><div class="linkBHEAD"><a href="windowlistener.html">How to Write Window Listeners</a></div><div class="linkAHEAD"><a href="api.html">Listener API Table</a></div><div class="linkAHEAD"><a href="problems.html">Solving Common Event-Handling Problems</a></div></div> </div> <div id=MainFlow class=MainFlow_indented> <span id=BreadCrumbs> <a href=../../index.html target=_top>Home Page</a> > <a href=../index.html target=_top>Creating a GUI with JFC/Swing</a> > <a href=index.html target=_top>Writing Event Listeners</a> </span> <div class=NavBit> <a target=_top href=treeexpansionlistener.html>« Previous</a> • <a target=_top href=../TOC.html>Trail</a> • <a target=_top href=treeselectionlistener.html>Next »</a> </div> <div id=PageTitle>How to Write a Tree Model Listener</div> <blockquote>By implementing a tree model listener,you can detect when the data displayed by a <a class="TutorialLink" target="_top" href="../components/tree.html">tree</a> changes.You might use a tree model listenerto detect when the user edits tree nodes.To see an example and discussion of doing so,read<a class="TutorialLink" target="_top" href="../components/tree.html#dynamic">Dynamically Changing a Tree</a>.</blockquote><h3><a name="api">The Tree Model Listener API</a></h3><blockquote><p align=center><a name="treemodellistener">The TreeModelListener Interface</a><p><em><code>TreeModelListener</code> has no adapter class.</em><table border=1><tr><th align=left>Method</th><th align=left>Purpose</th></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelListener.html#treeNodesChanged(javax.swing.event.TreeModelEvent)">treeNodesChanged(TreeModelEvent)</a></td><td> Called when one or more sibling nodes have changed in some way.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelListener.html#treeNodesInserted(javax.swing.event.TreeModelEvent)">treeNodesInserted(TreeModelEvent)</a></td><td> Called after nodes have been inserted into the tree.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelListener.html#treeNodesRemoved(javax.swing.event.TreeModelEvent)">treeNodesRemoved(TreeModelEvent)</a></td><td> Called after nodes have been removed from the tree.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelListener.html#treeStructureChanged(javax.swing.event.TreeModelEvent)">treeStructureChanged(TreeModelEvent)</a></td><td> Called after the tree's structure has drastically changed.</td></tr></table><p align=center><a name="treemodelevent">The TreeModelEvent API</a><p><table border=1><tr><th align=left>Method</th><th align=left>Purpose</th></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/java/util/EventObject.html#getSource()">Object getSource()</a><br>(<em>in <code>java.util.EventObject</code></em>)</td><td> Return the object that fired the event.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelEvent.html#getChildIndices()">int[] getChildIndices()</a></td><td> For <code>treeNodesChanged</code>, <code>treeNodesInserted</code>, and <code>treeNodesRemoved</code>, returns the indices of the changed, inserted, or deleted nodes, respectively. Returns nothing useful for <code>treeStructureChanged</code>.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelEvent.html#getChildren()">Object[] getChildren()</a></td><td> Returns the objects corresponding to the child indices.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelEvent.html#getPath()">Object[] getPath()</a></td><td> Returns the path to the parent of the changed, inserted, or deleted nodes. For <code>treeStructureChanged</code>, returns the path to the node beneath which the structure has changed.</td></tr><tr><td><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/event/TreeModelEvent.html#getTreePath()">TreePath getTreePath()</a></td><td> Returns the same thing as <code>getPath</code>, but as a <a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/tree/TreePath.html"><code>TreePath</code></a> object.</td></tr></table></blockquote><a name="eg"><h3>Examples that Use Tree Model Listeners</h3></a><blockquote>The following table lists theexamples that use tree expansion listeners.<p><table><tr><th align=left> Example</th><th align=left> Where Described</th><th align=left> Notes</th></tr><tr valign=top><td> <a href="../components/examples/index.html#DynamicTreeDemo"><code>DynamicTreeDemo</code></a></td><td><a class="TutorialLink" target="_top" href="../components/tree.html#dynamic">How to Use Trees</a></td><td> The <code>DynamicTree</code> class implements a tree model listener to detect when the user has edited a node's data.</td></tr></table> </blockquote> <div class=NavBit> <a target=_top href=treeexpansionlistener.html>« Previous</a> • <a target=_top href=../TOC.html>Trail</a> • <a target=_top href=treeselectionlistener.html>Next »</a> </div> </div> <div id=Footer><div id=TagNotes> Problems with the examples? Try <a target="_blank" href=../../information/run-examples.html>Compiling and Running the Examples: FAQs</a>. <br> Complaints? Compliments? Suggestions? <a target="_blank" href="http://developer.sun.com/contact/tutorial_feedback.jsp">Give us your feedback</a>.<br><br> <a target="_blank" href="../../information/copyright.html">Copyright</a> 1995-2006 Sun Microsystems, Inc. All rights reserved. <span id=Download></span></div> </div> <div class=PrintHeaders> <b>Previous page:</b> How to Write a Tree Expansion Listener <br><b>Next page:</b> How to Write a Tree Selection Listener </div> </body></html> ⌨️ 快捷键说明
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