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/*!

    \class QDesignerMemberSheetExtension

    \brief The QDesignerMemberSheetExtension class allows you to

    manipulate a widget's member functions which is displayed when

    configuring connections using Qt Designer's mode for editing

    signals and slots.

    \inmodule QtDesigner

    QDesignerMemberSheetExtension is a collection of functions that is

    typically used to query a widget's member functions, and to

    manipulate the member functions' appearance in \QD's signals and

    slots editing mode. For example:

    \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 2

    When implementing a custom widget plugin, a pointer to \QD's

    current QDesignerFormEditorInterface object (\c formEditor in the

    example above) is provided by the

    QDesignerCustomWidgetInterface::initialize() function's parameter.

    The member sheet (and any other extension), can be retrieved by

    querying \QD's extension manager using the qt_extension()

    function. When you want to release the extension, you only need to

    delete the pointer.

    All widgets have a default member sheet used in \QD's signals and

    slots editing mode with the widget's member functions. But

    QDesignerMemberSheetExtension also provides an interface for

    creating custom member sheet extensions.

    \warning \QD uses the QDesignerMemberSheetExtension to facilitate

    the signal and slot editing mode. Whenever a connection between

    two widgets is requested, \QD will query for the widgets' member

    sheet extensions. If a widget has an implemented member sheet

    extension, this extension will override the default member sheet.

    To create a member sheet extension, your extension class must

    inherit from both QObject and QDesignerMemberSheetExtension. Then,

    since we are implementing an interface, we must ensure that it's

    made known to the meta object system using the Q_INTERFACES()

    macro:

    \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 3

    This enables \QD to use qobject_cast() to query for

    supported interfaces using nothing but a QObject pointer.

    In \QD the extensions are not created until they are

    required. For that reason, when implementing a member sheet

    extension, you must also create a QExtensionFactory, i.e a class

    that is able to make an instance of your extension, and register

    it using \QD's \l {QExtensionManager}{extension manager}.

    When a widget's member sheet extension is required, \QD's \l

    {QExtensionManager}{extension manager} will run through all its

    registered factories calling QExtensionFactory::createExtension()

    for each until the first one that is able to create a member sheet

    extension for that widget, is found. This factory will then make

    an instance of the extension. If no such factory is found, \QD

    will use the default member sheet.

    There are four available types of extensions in \QD:

    QDesignerContainerExtension, QDesignerMemberSheetExtension,

    QDesignerPropertySheetExtension and

    QDesignerTaskMenuExtension. \QD's behavior is the same whether the

    requested extension is associated with a multi page container, a

    member sheet, a property sheet or a task menu.

    The QExtensionFactory class provides a standard extension

    factory, and can also be used as an interface for custom

    extension factories. You can either create a new

    QExtensionFactory and reimplement the

    QExtensionFactory::createExtension() function. For example:

    \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 4

    Or you can use an existing factory, expanding the

    QExtensionFactory::createExtension() function to make the factory

    able to create a member sheet extension as well. For example:

    \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 5

    For a complete example using an extension class, see \l

    {designer/taskmenuextension}{Task Menu Extension example}. The

    example shows how to create a custom widget plugin for Qt

    Designer, and how to to use the QDesignerTaskMenuExtension class

    to add custom items to \QD's task menu.

    \sa QExtensionFactory, QExtensionManager, {Creating Custom Widget

    Extensions}

*/

/*!

    \fn QDesignerMemberSheetExtension::~QDesignerMemberSheetExtension()

    Destroys the member sheet extension.

*/

/*!

    \fn int QDesignerMemberSheetExtension::count() const

    Returns the extension's number of member functions.

*/

/*!

    \fn int QDesignerMemberSheetExtension::indexOf(const QString &name) const

    Returns the index of the member function specified by the given \a

    name.

    \sa memberName()

*/

/*!

    \fn QString QDesignerMemberSheetExtension::memberName(int index) const

    Returns the name of the member function with the given \a index.

    \sa indexOf()

*/

/*!

    \fn QString QDesignerMemberSheetExtension::memberGroup(int index) const

    Returns the name of the member group specified for the function

    with the given \a index.

    \sa indexOf(), setMemberGroup()

*/

/*!

    \fn void QDesignerMemberSheetExtension::setMemberGroup(int index, const QString &group)

    Sets the member group of the member function with the given \a

    index, to \a group.

    \sa indexOf(), memberGroup()

*/

/*!

    \fn bool QDesignerMemberSheetExtension::isVisible(int index) const

    Returns true if the member function with the given \a index is

    visible in \QD's signal and slot editor, otherwise false.

    \sa indexOf(), setVisible()

*/

/*!

    \fn void QDesignerMemberSheetExtension::setVisible(int index, bool visible)

    If \a visible is true, the member function with the given \a index

    is visible in \QD's signals and slots editing mode; otherwise the

    member function is hidden.

    \sa indexOf(), isVisible()

*/

/*!

    \fn virtual bool QDesignerMemberSheetExtension::isSignal(int index) const

    Returns true if the member function with the given \a index is a

    signal, otherwise false.

    \sa indexOf()

*/

/*!

    \fn bool QDesignerMemberSheetExtension::isSlot(int index) const

    Returns true if the member function with the given \a index is a

    slot, otherwise false.

    \sa indexOf()

*/

/*!

    \fn bool QDesignerMemberSheetExtension::inheritedFromWidget(int index) const

    Returns true if the member function with the given \a index is

    inherited from QWidget, otherwise false.

    \sa indexOf()

*/

/*!

    \fn QString QDesignerMemberSheetExtension::declaredInClass(int index) const

    Returns the name of the class in which the member function with

    the given \a index is declared.

    \sa indexOf()

*/

/*!

    \fn QString QDesignerMemberSheetExtension::signature(int index) const

    Returns the signature of the member function with the given \a

    index.

    \sa indexOf()

*/

/*!

    \fn QList<QByteArray> QDesignerMemberSheetExtension::parameterTypes(int index) const

    Returns the parameter types of the member function with the given

    \a index, as a QByteArray list.

    \sa indexOf(), parameterNames()

*/

/*!

    \fn QList<QByteArray> QDesignerMemberSheetExtension::parameterNames(int index) const

    Returns the parameter names of the member function with the given

    \a index, as a QByteArray list.

    \sa indexOf(), parameterTypes()

*/