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        <h1>NetBeans Options Window Module Tutorial</h1>

        <p>This tutorial demonstrates how to extend the Options window.</p>

        <p><strong class="notes">Note: </strong>This document uses NetBeans Platform 7.1 and
            NetBeans IDE 7.1. If you
            are using an earlier version, see <a href="../70/nbm-options.html">the previous version
                of this document</a>.</p>

        <p><b>Contents</b></p>

        <p><img src="../../images/articles/71/netbeans-stamp.png" class="stamp" width="114" height="114" alt="Content on this page applies to NetBeans IDE 7.1" title="Content on this page applies to NetBeans IDE 7.1"/></p>
        <ul class="toc">
            <li><a href="#intro">Introduction to Options Window Extensions</a></li>
            <li><a href="#creatingthemoduleproject">Creating the Module Project</a></li>
            <li><a href="#creatingandgettingtoknowthemainfiles">Extending the Options Window</a>
                <ul>
            <li><a href="#secondary">Scenario 1: Creating a Secondary Panel</a></li>
            <li><a href="#primary">Scenario 2: Creating a Primary Panel</a></li>
                </ul>
            </li>
            <li><a href="#creatingandgettingtoknowthemainfiles">Storing and Loading Preferences</a></li>
        </ul>

        <p><b>To follow this tutorial, you need the software and resources listed in the following 
                table.</b></p>

        <table>
            <tbody>
                <tr>
                    <th class="tblheader" scope="col">Software or Resource</th>
                    <th class="tblheader" scope="col">Version Required</th>
                </tr>
                <tr>
                    <td class="tbltd1"><a href="https://netbeans.org/downloads/index.html">NetBeans IDE</a></td>
                    <td class="tbltd1">version 7.1 or above</td>
                </tr>
                <tr>
                    <td class="tbltd1"><a href="http://java.sun.com/javase/downloads/index.jsp">Java Developer Kit (JDK)</a></td>
                    <td class="tbltd1">version 6 or above</td>
                </tr>
            </tbody>
        </table>

        <h2 class="tutorial"><a name="intro"></a>Introduction to Options Window Extensions</h2>

        <p>Whether you
            are creating a plugin for NetBeans IDE or for another application, there
            is a good chance that you want the user to be able to specify 
            settings, also known as "customizations" or "preferences",
            such as the location of an external file. The Options window offers a
            centralized location for all such settings. In NetBeans IDE, the Options window
            is found under the Tools menu and looks as follows:</p>

        <p><img src="../../images/tutorials/options/71/options-window-ide.png" alt="Primary Panel"/></p>

        <p>The NetBeans APIs give you access to the Options window in two different ways. In the
            first case, you can add a new main panel to the Options window. Using this approach, your
            module will add a new 'primary' panel to the Options window, similar to the 'General' panel
            or 'Editor' panel shown in the screenshot above. Your panel will, just like these panels,
            have a name and an image in the top of the Options window, together with its settings in
            the body of the panel.</p>
        <p>In the second case, the NetBeans APIs allow you to add a new subpanel
            within the Miscellaneous panel, as shown below:</p>

        <p><img src="../../images/tutorials/options/71/options-window-ide2.png" alt="Misc Panel"/></p>

        <p>In this case, your new subpanel will have its own tab, just like "Ant" or "Diff" above, together
            with the settings within a panel in the body of the Options window extension.
            Whether you add your user settings within a new primary panel or within a tab in the
            Miscellaneous panel is completely up to you. Factors that might influence your
            decision are purely personal and a question of your own taste.</p>

        <p>At the end of this tutorial, the Options window will be extended with a new panel.
            In addition, you will be shown how to use the NetBeans <tt><a href="http://bits.netbeans.org/dev/javadoc/org-openide-util/org/openide/util/NbPreferences.html">NbPreferences</a></tt> class to store and
            use the settings that the user specifies in your Options window extension.</p>

        <h2 class="tutorial"><a name="creatingthemoduleproject"></a>Creating the Module Project</h2>

        <p>We begin by working through the New Module Project
            wizard. At the end of it, we will have a basic
            source structure, with some default files, that
            every NetBeans module requires.</p>

        <ol>
            <li>Choose File &gt; New Project (Ctrl+Shift+N). Under Categories, select NetBeans Modules.
                Under Projects, select Module. Click Next.</li>
            <li>In the Name and Location panel, type <tt>CoolOptions</tt> in the Project Name field.
                Change the Project Location to any directory on your computer. Click Next.</li>
            <li>In the Basic Module Configuration panel, type <tt>org.netbeans.modules.cooloptions</tt>
                in Code Name Base. Click Finish.</li>
        </ol>


        <p> The IDE creates the <tt>CoolOptions</tt>
            project. The project contains all of your sources and project
            metadata, such as the project's Ant build script. The project opens in the IDE. You can view its logical
            structure in the Projects window (Ctrl+1) and its file structure in the Files window (Ctrl+2).</p>


        <!-- ===================================    ================================================== -->
        <h2><a name="creatingandgettingtoknowthemainfiles"></a>Extending the Options Window</h2>
        <p>Now that we have a module project, which gives us our source structure,
            we run through another wizard that will create the NetBeans API implementation
            of an Options window extension.</p>
        <p>In the wizard, you need to specify the type of panel you want to have generated, either a primary
            panel or a miscellaneous panel, and then the wizard will
            generate all the required classes and annotations that will
            generate <tt>layer.xml</tt> entries at compile time for you.</p>


        <ol>

            <li>Right-click the "CoolOptions" project node and
                choose New &gt; Other. Under Categories, select Module Development. Under File Types, 
                select Options Panel. Click Next.</li>
            <li><p>In the next panel, you specify the type of panel that you want to create:</p>

                <p><img src="../../images/tutorials/options/71/options-window-template-1.png" alt="Initial Projects window."/></p>

                <p>Here, you need to fill
                    in the information required.</p>

            </li>

        </ol>

        <div class="indent">

            <h3><a name="secondary"></a>Scenario 1: Creating a Secondary Panel</h3>

            <p>In this section, we assume that we are creating a Secondary panel,
                which, in this case, will add a new subpanel to the Miscellaneous Panel. </p>
            <ol><li><p>Fill in the dialog with the following details:</p>
                    <p></p>
                    <ul>
                        <li><b>Primary Panel.</b> Advanced</li>
                        <li><b>Title.</b> Cool Options</li>
                        <li><b>Keywords.</b> cool</li>
                    </ul>
                    <p>Click Next.</p></li>

                <li>In the Location panel, you can set the prefix of the classes that will
                    be generated and the package where they will be placed. Change the Class Name
                    Prefix to "Cool" and leave the package name unchanged. Click Finish.</li>

                <li><p>Look at the generated code. The Projects window should now look as follows:</p>

                    <p><img src="../../images/tutorials/options/71/options-projects-window.png" alt="Initial Projects window."/></p>

                    <p>The content of the <tt>CoolOptionsPanelController</tt>:</p>

                    <pre class="examplecode">package org.netbeans.modules.cooloptions;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import javax.swing.JComponent;
import org.netbeans.spi.options.OptionsPanelController;
import org.openide.util.HelpCtx;
import org.openide.util.Lookup;

@OptionsPanelController.SubRegistration(location = "Advanced",
displayName = "#AdvancedOption_DisplayName_CoolOptions",
keywords = "#AdvancedOption_Keywords_CoolOptions",
keywordsCategory = "Advanced/CoolOptions")
public final class CoolOptionsOptionsPanelController extends OptionsPanelController {

    private CoolOptionsPanel panel;
    private final PropertyChangeSupport pcs = new PropertyChangeSupport(this);
    private boolean changed;

    public void update() {
        getPanel().load();
        changed = false;
    }

    public void applyChanges() {
        getPanel().store();
        changed = false;
    }

    public void cancel() {
        // need not do anything special, if no changes have been persisted yet
    }

    public boolean isValid() {
        return getPanel().valid();
    }

    public boolean isChanged() {
        return changed;
    }

    public HelpCtx getHelpCtx() {
        return null; // new HelpCtx("...ID") if you have a help set
    }

    public JComponent getComponent(Lookup masterLookup) {
        return getPanel();
    }

    public void addPropertyChangeListener(PropertyChangeListener l) {
        pcs.addPropertyChangeListener(l);
    }

    public void removePropertyChangeListener(PropertyChangeListener l) {
        pcs.removePropertyChangeListener(l);
    }

    private CoolOptionsPanel getPanel() {
        if (panel == null) {
            panel = new CoolOptionsPanel(this);
        }
        return panel;
    }

    void changed() {
        if (!changed) {
            changed = true;
            pcs.firePropertyChange(OptionsPanelController.PROP_CHANGED, false, true);
        }
        pcs.firePropertyChange(OptionsPanelController.PROP_VALID, null, null);
    }
    
}</pre>

                    <p>The content of <tt>CoolOptionsPanel</tt>:</p>

                    <pre class="examplecode">package org.netbeans.modules.cooloptions;

final class CoolOptionsPanel extends javax.swing.JPanel {

    private final CoolOptionsOptionsPanelController controller;

    CoolOptionsPanel(CoolOptionsOptionsPanelController controller) {
        this.controller = controller;
        initComponents();
        // TODO listen to changes in form fields and call controller.changed()
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt;                          
    private void initComponents() {

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 202, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 68, Short.MAX_VALUE)
        );
    }// &lt;/editor-fold&gt;                        

    void load() {
        // TODO read settings and initialize GUI
        // Example:        
        // someCheckBox.setSelected(Preferences.userNodeForPackage(CoolOptionsPanel.class).getBoolean("someFlag", false));
        // or for org.openide.util with API spec. version >= 7.4:
        // someCheckBox.setSelected(NbPreferences.forModule(CoolOptionsPanel.class).getBoolean("someFlag", false));
        // or:
        // someTextField.setText(SomeSystemOption.getDefault().getSomeStringProperty());
    }

    void store() {
        // TODO store modified settings
        // Example:
        // Preferences.userNodeForPackage(CoolOptionsPanel.class).putBoolean("someFlag", someCheckBox.isSelected());
        // or for org.openide.util with API spec. version >= 7.4:
        // NbPreferences.forModule(CoolOptionsPanel.class).putBoolean("someFlag", someCheckBox.isSelected());
        // or:
        // SomeSystemOption.getDefault().setSomeStringProperty(someTextField.getText());
    }

    boolean valid() {
        // TODO check whether form is consistent and complete
        return true;
    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   

}</pre>
                    <p>We have done no coding whatsoever, but we can already try out our module. When we do so
                        we will see our new panel, integrated with the other panels in the Options window. In subsequent
                        sections, we will add Swing components that will enable the user to enter and store their settings.</p></li>

                <li><p>In the Projects window, right-click the <tt>CoolOptions</tt> project and choose Run.
                        The module is built and installed in a new instance of the target NetBeans Platform.
                        The target NetBeans Platform opens so that you
                        can try out your new module.</p></li> 
                <li><p>Choose Tools &gt; Options from the main menu. The Options window opens.
                        Select the Miscellaneous panel
                        and notice that your new "Cool Options" panel has been
                        integrated there:</p>

                    <p><img src="../../images/tutorials/options/71/options-window-custom1.png" alt="Initial Projects window."/></p>

                    <p>Close the Options window. Press Ctrl-I 
                        and then type the keyword you defined earlier:</p>
                    <p><img src="../../images/tutorials/options/nbm-options-65-8.png" alt="Options window installed 1."/></p>
                    <p>You should then be
                        able to click on the returned item to open the Options window. In addition,
                        the specific category that you created should be opened.</p></li>

            </ol>

            <h3><a name="primary"></a>Scenario 2: Creating a Primary Panel</h3>

            <p>In this section, we assume that we are creating a main panel,
                that is, a primary panel, using the lower part of the panel shown earlier:</p>
            <p><img src="../../images/tutorials/options/71/options-window-template-2.png" alt="Initial Projects window."/></p>

            <ol><li><p>Fill in the dialog with the following details:</p>
                    <p></p>
                    <ul>
                        <li><b>Category Label.</b> Cool</li>
                        <li><b>Icon (32x32).</b> Browse to a 32x32 pixel icon somewhere on your system. It
                            will be copied into the module.</li>
                        <li><b>Keywords.</b> cool</li>
                        <li><b>Allow Secondary Panels.</b> Determines whether the primary panel will be extensible.</li>
                    </ul>
                    <p>Click Next.</p></li>

                <li>In the Location panel, you can set the prefix of the classes that will
                    be generated and the package where they will be placed. Change the Class Name
                    Prefix to "Cool" and leave the package name unchanged. Click Finish.</li>

                <li><p>Look at the generated code. </p>
                    <p></p>
                    <ul>
                        <li><p>If you did not select "Allow Secondary Panels", two classes
                                very similar to those created in the previous section
                                are generated. The panel is the same as in the previous
                                section, while the content of the <tt>CoolOptionsPanelController</tt> is the
                                same too, except for the annotations:</p>

                            <pre class="examplecode">@OptionsPanelController.TopLevelRegistration(categoryName = "#OptionsCategory_Name_Cool",
iconBase = "org/netbeans/modules/cooloptions/icon32.png",
keywords = "#OptionsCategory_Keywords_Cool",
keywordsCategory = "Cool")</pre></li>

                        <li><p>If you selected "Allow Secondary Panels", the wizard does not create a panel, nor
                                a controller class, because the content of the panel will be provided by
                                its subpanels. Instead, the wizard generates a <tt>package-info.java</tt>
                                file, with this content:</p>

                            <pre class="examplecode">@ContainerRegistration(id = "Cool", categoryName = "#OptionsCategory_Name_Cool", iconBase = "org/netbeans/modules/cooloptions/icon32.png", keywords = "#OptionsCategory_Keywords_Cool", keywordsCategory = "Cool")
package org.netbeans.modules.cooloptions;

import org.netbeans.spi.options.OptionsPanelController.ContainerRegistration;</pre>
                            <p>Now you can create some secondary panels within the new primary
                                panel you created above. To do so, return to the previous section
                            about secondary panels. The "id" of the new primary panel is "cool" and
                            hence that is the name of the primary panel to be used in the wizard
                            when you're defining the secondary panel.</p></li>
                    </ul>
                    <p>When the module is compiled, the annotations shown above are turned
                        into <tt>layer.xml</tt> entries, registering the primary panels
                        and secondary panels you've created.</p>

                    <p>We have done no coding whatsoever, but we can already try out our module. When we do so
                        we will see our new panel, integrated with the other panels in the Options window. In subsequent
                        sections, we will add Swing components that will enable the user to enter and store their settings.</p></li>

                <li><p>In the Projects window, right-click the <tt>CoolOptions</tt> project and choose Run.
                        The module is built and installed in a new instance of the target NetBeans Platform.
                        The target NetBeans Platform opens so that you
                        can try out your new module.</p></li> 
                <li><p>Choose Tools &gt; Options from the main menu. The Options window opens.
                        Select the panel
                        you've created, for example, in the screenshot below,
                        you see a new primary panel containing a secondary panel:</p>

                    <p><img src="../../images/tutorials/options/71/options-window-custom2.png" alt="Initial Projects window."/></p>

                    <p>Close the Options window. Press Ctrl-I 
                        and then type the keyword you defined earlier:</p>
                    <p><img src="../../images/tutorials/options/nbm-options-65-8.png" alt="Options window installed 1."/></p>
                    <p>You should then be
                        able to click on the returned item to open the Options window. In addition,
                        the specific category that you created should be opened.</p></li>

            </ol>
        </div>
        <p>In the next section, we add a text field and button to the panel and
            we learn how to store the user's setting when the Options window closes.
            Then we learn how to load the setting and use it, when appropriate, in the module's code.</p>


        <!-- ======================================================================================= -->

        <h2><a name="tweaking"></a>Storing and Loading Preferences</h2>

        <p>In this section, we begin by designing the Options window extension.
            Using the GUI Builder, we add a <tt>JPanel</tt>, a <tt>JTextField</tt>, 
            and a <tt>JLabel</tt>. Then we install the module again and we see
            the result. Next, we begin coding. Using the NetBeans <tt><a href="http://bits.netbeans.org/dev/javadoc/org-openide-util/org/openide/util/NbPreferences.html">NbPreferences</a></tt> class,
            we store the value entered by the user. Storage of preferences is done
            in the user directory. Then we load the preference into an appropriate place
            in our code.</p>


        <div class="indent">
            <h3 class="tutorial"><a name="icon"></a>Designing the Panel</h3>

            <p>First, let's add some Swing components to the panel, to give
                the user a means of setting a preference.</p>

            <ol>
                <li>Make the panel in the Design view of <tt>CoolPanel.java</tt> larger, so
                    that you have room to manoeuvre.</li>
                <li><p>Drag and drop a <tt>JPanel</tt>, a <tt>JTextField</tt>, and a <tt>JLabel</tt>
                        onto the panel. Add a titled border, containing the text "Details",
                        to the <tt>JPanel</tt>. Change the text of the <tt>JLabel</tt> to "Name".
                        You should now see the following:</p>
                    <p><img src="../../images/tutorials/options/nbm-options-65-9.png" alt="Options design"/></p></li>
                <li><p>Install the module again. 
                        In the Options window, you should
                        now see the following:</p>
                    <p><img src="../../images/tutorials/options/nbm-options-65-10.png" alt="Options design"/></p></li>
            </ol>
            <p>You have now designed the new Options panel. In the next section, we'll add logic
                to the panel so that the text in the text field will be stored when the Options window
                closes.</p>

            <h3 class="tutorial"><a name="sources"></a>Storing Preferences</h3>
            <p>In this section, we add code that will store the preference after the user clicks OK in the Options window.</p>

            <ol>        
                <li>Look in the source of the <tt>CoolPanel</tt> class. You should see the <tt>store()</tt> method defined as follows:

                    <pre class="examplecode">void store() {
    // TODO store modified settings
    // Example:
    // Preferences.userNodeForPackage(CoolPanel.class).putBoolean("someFlag", someCheckBox.isSelected());
    // or for org.openide.util with API spec. version >= 7.4:
    // NbPreferences.forModule(CoolPanel.class).putBoolean("someFlag", someCheckBox.isSelected());
    // or:
    // SomeSystemOption.getDefault().setSomeStringProperty(someTextField.getText());
 }</pre>

                    <p>The comments in the code present the three ways in which preferences can be stored. The first uses
                        the JDK's Preferences API. The second uses the NetBeans IDE 6.x+ NetBeans <tt><a href="http://bits.netbeans.org/dev/javadoc/org-openide-util/org/openide/util/NbPreferences.html">NbPreferences</a></tt> class. The third
                        uses the pre-6.0 System Option class. The third approach is deprecated, while the first does not
                        store preferences in the application's user directory. The second approach, the NetBeans <tt><a href="http://bits.netbeans.org/dev/javadoc/org-openide-util/org/openide/util/NbPreferences.html">NbPreferences</a></tt> class,
                        is the recommended approach. The NetBeans <tt><a href="http://bits.netbeans.org/dev/javadoc/org-openide-util/org/openide/util/NbPreferences.html">NbPreferences</a></tt> class is based on the JDK's Preferences API, but is
                        tailored towards NetBeans applications, in that it stores preferences in the application's user
                        directory, which is a convenient place to store them since all other user customizations for your application
                        are stored there too.</p></li>

                <li>In the <tt>store()</tt> method, delete all the comments and add this line:

                    <pre class="examplecode">NbPreferences.forModule(CoolPanel.class).put("namePreference", jTextField1.getText());</pre>

                    <p>Press Alt-Enter in the line. Let the IDE specify an import statement for the
                        NetBeans API package called <tt>org.openide.util.NbPreferences</tt>.</p></li>

                <li><p>Install the module again. Type a
                        name in your Options window extension panel:</p>

                    <p><img src="../../images/tutorials/options/nbm-options-65-11.png" alt="Typing a name"/></p></li>

                <li><p>Click OK. Switch to the Files window (Ctrl-2). Expand the application's <tt>build</tt>
                        folder. Look in the application's user directory,
                        within the <tt>config</tt> folder.
                        In the <tt>config</tt>  folder, you should find a folder called <tt>Preferences</tt>, containing
                        a properties file for your Options window.
                        Open the folder and notice that the preference
                        has been stored there:</p>

                    <p><img src="../../images/tutorials/options/nbm-options-65-12.png" alt="Preferences folder"/></p></li>

            </ol>

            <h3 class="tutorial"><a name="sources"></a>Loading Preferences</h3>
            <p>In this section, we add code that will load the preference. We want the
                preference, in this case "Harry Potter", to be loaded into at least two places.
                First, we want the preference to be loaded into the Options window when the application
                restarts. Secondly, we want to be able to use the preference somewhere in our module. After
                all, the reason why a preference is set is so that it can be used somewhere else in the code.
                Finally, we also need to handle the situation where the preference changes. In that case,
                we need to add a preference listener and use the new value in our code, once the value changes.</p>

            <ol>        
                <li>Look in the source of the <tt>CoolPanel</tt> class. You should see the <tt>load()</tt> method,
                    defined with comments, similar to those discussed in the previous section.</li>

                <li>In the <tt>load()</tt> method, delete all the comments and replace them with the following:

                    <pre class="examplecode">jTextField1.setText(NbPreferences.forModule(CoolPanel.class).get("namePreference", ""));</pre>   

                    <p>Now, when you restart the application, the preference is loaded into the Options window.</p>

                    <p>Next, we will create a new <tt>TopComponent</tt>. We will only do so to demonstrate
                        how a preference is used. Instead of a <tt>TopComponent</tt>, you could use any other Java class
                        to use your preference. In other words, this is just an example of using a user's preference
                        in the context of a module.</p></li>

                <li>Right-click the module project and choose New Window Component. Call the Window Component
                    whatever you like and position it anywhere you want it to be. When you have created it,
                    add a <tt>JTextField</tt> to the <tt>TopComponent</tt>. This is where we will display the user's
                    preference.</li>

                <li>Switch to the <tt>TopComponent's</tt> Source view and add the following lines
                    to the end of the constructor:

                    <pre class="examplecode">Preferences pref = NbPreferences.forModule(CoolPanel.class);
String name = pref.get("namePreference", "");

pref.addPreferenceChangeListener(new PreferenceChangeListener() {
    public void preferenceChange(PreferenceChangeEvent evt) {
        if (evt.getKey().equals("namePreference")) {
            jTextField1.setText(evt.getNewValue());
        }
    }
});

jTextField1.setText(name);</pre></li>

                <li>Install the module again.

                    <p>Whenever the application restarts, the current preference in the Options window
                        is shown in the <tt>TopComponent</tt>. And whenever you change the preference in
                        the Options window, the <tt>TopComponent</tt> immediately reflects the new value,
                        as soon as OK is clicked in the Options window.</p></li>
            </ol>


            <p>Congratulations! You have successfully completed the Options Window Module Tutorial.
                You now know how to provide the functionality needed for users to set your module's options.</p>


        </div>


        <p><br/></p>
        <div class="feedback-box"><a href="https://netbeans.org/about/contact_form.html?to=3&amp;subject=Feedback:%20Options%20Window%207.1%20Module%20Tutorial">Send Us Your Feedback</a></div>
        <p><br style="clear:both;" /></p>
        <!-- ======================================================================================== -->

        <h2><a name="nextsteps"></a>Next Steps</h2>

        <p>For more information about creating and developing NetBeans modules, see the following resources:</p>
        <ul>
            <li><a href="https://netbeans.org/kb/trails/platform.html">Other Related Tutorials</a></li>
            <li><a href="https://netbeans.org/download/dev/javadoc/">NetBeans API Javadoc</a></li>
        </ul>

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