netbeans.apache.org/src/content/wiki/DevFaqListenEditorChanges.asciidoc

// 
//     Licensed to the Apache Software Foundation (ASF) under one
//     or more contributor license agreements.  See the NOTICE file
//     distributed with this work for additional information
//     regarding copyright ownership.  The ASF licenses this file
//     to you under the Apache License, Version 2.0 (the
//     "License"); you may not use this file except in compliance
//     with the License.  You may obtain a copy of the License at
// 
//       http://www.apache.org/licenses/LICENSE-2.0
// 
//     Unless required by applicable law or agreed to in writing,
//     software distributed under the License is distributed on an
//     "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
//     KIND, either express or implied.  See the License for the
//     specific language governing permissions and limitations
//     under the License.
//

= DevFaqListenEditorChanges
:jbake-type: wiki
:jbake-tags: wiki, devfaq, needsreview
:jbake-status: published
:keywords: Apache NetBeans wiki DevFaqListenEditorChanges
:description: Apache NetBeans wiki DevFaqListenEditorChanges
:toc: left
:toc-title:
:syntax: true

=== How can I track what file the user is currently editing?

==== EditorRegistry

The editor keeps a registry of open editors;  you can track the active editor using the following code:

[source,java]
----

import org.netbeans.api.editor.EditorRegistry;

PropertyChangeListener l = new PropertyChangeListener() {
  public void propertyChange(PropertyChangeEvent evt) {
    JTextComponent jtc = EditorRegistry.lastFocusedComponent();
    if (jtc != null) {
      Document d = jtc.getDocument();
      // use the document
    }
  }
};

EditorRegistry.addPropertyChangeListener(l);
----

*IMPORTANT*: If you attach any listener to the `Document` or anything else in the active editor text component, remember to remove them when the active editor changes.

Please read javadoc on `EditorRegistry` to see details about the properties delivered through the listener used in the above code. There are many property changes fired and if an event comes it does *not* necessarily mean that the active editor has changed.

==== NbDocument.findRecentEditorPane

If you have a `EditorCookie` you can use `NbDocument.findRecentEditorPane`

link:http://bits.netbeans.org/dev/javadoc/org-openide-text/org/openide/text/NbDocument.html#findRecentEditorPane-org.openide.cookies.EditorCookie-[http://bits.netbeans.org/dev/javadoc/org-openide-text/org/openide/text/NbDocument.html#findRecentEditorPane-org.openide.cookies.EditorCookie-]

Applies to: Netbeans 6.x and later

Platforms: All

=== Apache Migration Information

The content in this page was kindly donated by Oracle Corp. to the
Apache Software Foundation.

This page was exported from link:http://wiki.netbeans.org/DevFaqListenEditorChanges[http://wiki.netbeans.org/DevFaqListenEditorChanges] , 
that was last modified by NetBeans user Markiewb 
on 2016-02-22T22:27:20Z.


*NOTE:* This document was automatically converted to the AsciiDoc format on 2018-02-07, and needs to be reviewed.