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# QScriptExtensionPlugin Class Reference
[QtScript module]

The QScriptExtensionPlugin class provides an abstract base for custom QScript extension plugins. More...

     #include <QScriptExtensionPlugin>

This class is not part of the Qt GUI Framework Edition.

Inherits QObject.

This class was introduced in qtscriptclassic 4.3.

- List of all members, including inherited members

## Public Functions

| QScriptExtensionPlugin ( QObject * parent = 0 )
| ~QScriptExtensionPlugin ()
virtual QStringList | keys () const = 0
QScriptValue | setupPackage ( const QString & key, QScriptEngine * engine ) const

## Reimplemented Public Functions

virtual void | initialize ( const QString & key, QScriptEngine * engine ) = 0

- 29 public functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 1 public slot inherited from QObject
- 1 signal inherited from QObject
- 1 public type inherited from QObject
- 4 static public members inherited from QObject
- 7 protected functions inherited from QObject
- 2 protected variables inherited from QObject

## Detailed Description

The QScriptExtensionPlugin class provides an abstract base for custom QScript extension plugins.

QScriptExtensionPlugin is a plugin interface that makes it possible to offer extensions that can be loaded dynamically into applications using the QScriptEngine class.

Writing a script extension plugin is achieved by subclassing this base class, reimplementing the pure virtual keys() and initialize() functions, and exporting the class using the Q_EXPORT_PLUGIN2() macro. See How to Create Qt Plugins for details.

See also QScriptEngine::importExtension() and Creating QtScript Extensions.

## Member Function Documentation

### QScriptExtensionPlugin::QScriptExtensionPlugin ( QObject * parent = 0 )

Constructs a script extension plugin with the given parent.

Note that this constructor is invoked automatically by the Q_EXPORT_PLUGIN2() macro, so there is no need for calling it explicitly.

### QScriptExtensionPlugin::~QScriptExtensionPlugin ()

Destroys the script extension plugin.

Note that Qt destroys a plugin automatically when it is no longer used, so there is no need for calling the destructor explicitly.

### void QScriptExtensionPlugin::initialize ( const QString & key, QScriptEngine * engine ) `[pure virtual]`

Initializes the extension specified by key in the given engine. The key must come from the set of keys().

See also keys().

### QStringList QScriptExtensionPlugin::keys () const `[pure virtual]`

Returns the list of keys this plugin supports.

These keys are usually the names of the "modules" or "packages" that are implemented in the plugin (e.g. `com.mycompany.MyProduct`).

See also initialize().

### QScriptValue QScriptExtensionPlugin::setupPackage ( const QString & key, QScriptEngine * engine ) const

This function is provided for convenience when reimplementing initialize(). It splits the given key on `'.'` (dot), and ensures that there's a corresponding path of objects in the environment of the given engine, creating new objects to complete the path if necessary. E.g. if the key is "com.trolltech", after the call to setupPackage() the script expression `com.trolltech` will evaluate to an object. More specifically, the engine's Global Object will have a property called "com", which in turn has a property called "trolltech".

Use this function to avoid global namespace pollution when installing your extensions in the engine.

See also initialize().