DevFaqListenEditorChanges

(Difference between revisions)
(How can I track what file the user is currently editing?)
(How can I track what file the user is currently editing?)
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===How can I track what file the user is currently editing?===
===How can I track what file the user is currently editing?===
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The editor keeps a registry of open editors;  you can track the active editor using this method: <tt>org.netbeans.api.editor.EditorRegistry.addPropertyChangeListener(myListener);</tt>.
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The editor keeps a registry of open editors;  you can track the active editor using the following code:
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<pre>
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import org.netbeans.api.editor.EditorRegistry;
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PropertyChangeListener l = new PropertyChangeListener() {
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  public void propertyChange(PropertyChangeEvent evt) {
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    JTextComponent jtc = EditorRegistry.lastFocusedComponent();
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    if (jtc != null) {
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      Document d = jtc.getDocument();
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      // use the document
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    }
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  }
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};
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EditorRegistry.addPropertyChangeListener(l);
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</pre>
'''IMPORTANT''': If you attach any listener to the <tt>Document</tt> or anything else in the active editor text component, remember to remove them when the active editor changes.
'''IMPORTANT''': If you attach any listener to the <tt>Document</tt> or anything else in the active editor text component, remember to remove them when the active editor changes.
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Please read javadoc on <tt>EditorRegistry</tt> 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.
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Revision as of 13:51, 16 June 2010

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

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

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.


Applies to: Netbeans 6.x and later

Platforms: All

Track the currently modified files by DataObject Registry listening - Sample code

DataObject.Registry registries = DataObject.getRegistry();
registries.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent e) {
        System.out.println("ChangedListener: o = " + e.getSource().getClass());
        System.out.println("ChangedListener: o.source = " + e.getSource());
    }
});
DataObject[] objects = registries.getModified();
for (int i = 0; i < objects.length; i++) {
    DataObject dataObj = objects[I];
    System.out.println("data object name = " + dataObj.getName());
    System.out.println("data object pimary file name = " + dataObj.getPrimaryFile().getName());
    Set fss = dataObj.files();
    Iterator iter = fss.iterator();
    while (iter.hasNext()) {
        FileObject fo = (FileObject) iter.next();
        System.out.println("\tset file object: " + fo.getName());
    }
}

Libraries needed

  • Datasystems API
  • File System API
  • Nodes API
  • Utilities API
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