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7.3.1.1 Registering with the MIME Lookup Module generate, create none none with none projectsprint pdf-417 c# In order to handle various mo none none dules registries of different sorts of objects associated with MIME types ef ciently, the Editor MIME Lookup module requires that we register our registry we must tell it about the folder we want other modules to put things into. To do that we need to implement an interface. ISBN - 10 4. Don t be fooled by the wor d editor in the name. This API originated as part of the editor, and its sources still live as a subproject of the Editor project in NetBeans sources.

However, it is not tied to the NetBeans Editor in any particular way. 5. The Editor MIME Lookup API also allows you to de ne folders to be used only when one MIME type is embedded in a le of another MIME type, such as a Java scriptlet inside a JSP page.

. Providing a UI Component in the Editor MIME Lookup mod ule s SPI, org.netbeans.spi.

editor. mimelookup.Class2LayerFolder.

This interface simply associates a particular subfolder of each MIME type s folder under Editors/ in the System Filesystem with the type of object we expect to look up in it, and provides the name of the folder. So we will add one class to the Pseudo Navigator module. Create a new class, org.

netbeans.examples.pseudonavigator.

FolderMapper. Implement it as follows in Example 7.7:.

Example 7.7: Implementing MIM none none E Lookup s SPI public class FolderMapper implements Class2LayerFolder { public FolderMapper() { } public Class getClazz() { return ListModelProvider.class; } public String getLayerFolderName() { return "ListModelProvider"; } public InstanceProvider getInstanceProvider() { return null; } }.

Now we need to register this class in the META-INF/services lookup, so that the Editor MIME Lookup module s infrastructure will recognize our our folder and objects. To do this, simply create a new le in the Pseudo Navigator module, META-INF/services/org.netbeans.

spi.editor. mimelookup.

Class2LayerFolder. Add to it one line of text to register our implementation of that interface:. org.netbeans.examples.pseudonavigator.FolderMapper Providing a Window Component to Show List Models As yet there is no Pseudo Na none for none vigator there is only an API that lets us create ListModelProviders. There is nothing that will actually use them or show them..

7 . Threading, Listener Patterns, and MIME Lookup To create a component that wi ll display the list models for which we have created a way to register, we will be using the Window Component wizard. It creates a UI component a subclass of org.openide.

windows. TopComponent that can be opened in the NetBeans main window. In 8 we will cover TopComponents in depth.

For now, it is enough to know that we can treat it as a standard Swing container such as a JPanel. The TopComponent will contain one child component, a javax.swing.

JList, which can show a ListModel. Right-click the pseudonavigator package and choose New . Window Component to bring up none for none the template wizard that will create a new TopComponent subclass. Enter PseudoNavigator for the class name pre x in the third step of the wizard. We will do speci c edits to turn it into the component we need.

What do we know about the requirements so far It will need to know when the selected le changes. The selected le is the le being edited in the editor, if an editor component has keyboard focus (in other words, if it is the active TopComponent in the Window System at the time). If focus is in a tree control, such as the Projects window, it should be noti ed when the selection in that tree changes and be able to nd out what the selected le is.

It must nd out what is the MIME type of the selected le. It must nd out if there is a ListModelProvider registered for that MIME type. If there is one, it must be able to get and call that ListModelProvider.

If it indeed nds a ListModelProvider, it must ask it to generate a javax.swing.ListModel for the le that is selected and show that model in some component, presumably a JList.

If it is showing a model and the user selects an item in the list, it must call the selected() method in the ListModelProvider, passing to it the item in the model that was selected. What happens when selected() is called is up to the ListModelProvider implementation. Presumably it will do something such as changing the caret position in the editor and sending keyboard focus back to it.

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