DevFaqSwitchingMenusByContext

How can I change the contents of a menu according to the selected file in the editor?

https://bitbucket.org/jglick/dynamicmenudemo/ also does something similar.

Can I hide or show a whole menu or toolbar?

To hide a menu or toolbar you have to edit your layer.xml and append _hidden to the name of the desired menu or toolbar. You may also hide *.instance files.

<folder name="Menu">
    <!-- Hide View menu -->
    <folder name="View_hidden"/>
    <folder name="SomeMenu">
        <!-- Hide a single menu item -->
        <file name="SomeAction.instance_hidden"/>
    </folder>
</folder>
<folder name="Toolbars">
    <!-- Hide Edit toolbar -->
    <folder name="Edit_hidden"/>
</folder>

It's generally much easier to do this from the NetBeans IDE, as described here.

Note that to hide the Navigate menu one has to declare GoTo_hidden instead of Navigate_hidden (the menu was originally named GoTo, but was later renamed to Navigate by the means of Bundle.properties).

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