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#include "qaxbindable.h"

#ifndef QT_NO_WIN_ACTIVEQT

#include <qmetaobject.h>

#include <qt_windows.h> // for IUnknown

#include "../shared/qaxtypes.h"

QT_BEGIN_NAMESPACE

/*!

    \class QAxBindable

    \brief The QAxBindable class provides an interface between a

    QWidget and an ActiveX client.

    \inmodule QAxServer

    The functions provided by this class allow an ActiveX control to

    communicate property changes to a client application. Inherit

    your control class from both QWidget (directly or indirectly) and

    this class to get access to this class's functions. The

    \l{moc}{meta-object compiler} requires you to inherit from

    QWidget first.

    \snippet doc/src/snippets/code/src_activeqt_control_qaxbindable.cpp 0

    When implementing the property write function, use

    requestPropertyChange() to get permission from the ActiveX client

    application to change this property. When the property changes,

    call propertyChanged() to notify the ActiveX client application

    about the change. If a fatal error occurs in the control, use the

    static reportError() function to notify the client.

    Use the interface returned by clientSite() to call the ActiveX

    client. To implement additional COM interfaces in your ActiveX

    control, reimplement createAggregate() to return a new object of a

    QAxAggregated subclass.

    The ActiveQt \l{activeqt/opengl}{OpenGL} example shows how to use

    QAxBindable to implement additional COM interfaces.

    \sa QAxAggregated, QAxFactory, {ActiveQt Framework}

*/

/*!

    Constructs an empty QAxBindable object.

*/

QAxBindable::QAxBindable()

:activex(0)

{

}

/*!

    Destroys the QAxBindable object.

*/

QAxBindable::~QAxBindable()

{

}

/*!

    Call this function to request permission to change the property

    \a property from the client that is hosting this ActiveX control.

    Returns true if the client allows the change; otherwise returns

    false.

    This function is usually called first in the write function for \a

    property, and writing is abandoned if the function returns false.

    \snippet doc/src/snippets/code/src_activeqt_control_qaxbindable.cpp 1

    \sa propertyChanged()

*/

bool QAxBindable::requestPropertyChange(const char *property)

{

    if (!activex)

        return true;

    return activex->emitRequestPropertyChange(property);

}

/*!

    Call this function to notify the client that is hosting this

    ActiveX control that the property \a property has been changed.

    This function is usually called at the end of the property's write

    function.

    \sa requestPropertyChange()

*/

void QAxBindable::propertyChanged(const char *property)

{

    if (!activex)

        return;

    activex->emitPropertyChanged(property);

}

/*!

    Returns a pointer to the client site interface for this ActiveX object,

    or null if no client site has been set.

    Call \c QueryInterface() on the returned interface to get the

    interface you want to call.

*/

IUnknown *QAxBindable::clientSite() const

{

    if (!activex)

        return 0;

    return activex->clientSite();

}

/*!

    Reimplement this function when you want to implement additional

    COM interfaces in the ActiveX control, or when you want to provide

    alternative implementations of COM interfaces. Return a new object

    of a QAxAggregated subclass.

    The default implementation returns the null pointer.

*/

QAxAggregated *QAxBindable::createAggregate()

{

    return 0;

}

/*!

    Reports an error to the client application. \a code is a

    control-defined error code. \a desc is a human-readable description

    of the error intended for the application user. \a src is the name

    of the source for the error, typically the ActiveX server name. \a

    context can be the location of a help file with more information

    about the error. If \a context ends with a number in brackets,

    e.g. [12], this number will be interpreted as the context ID in

    the help file.

*/

void QAxBindable::reportError(int code, const QString &src, const QString &desc, const QString &context)

{

    if (!activex)

        return;

    activex->reportError(code, src, desc, context);

}

/*!

    \since 4.1

    If the COM object supports a MIME type then this function is called

    to initialize the COM object from the data \a source in \a format.

    You have to open \a source for reading before you can read from it.

    Returns true to indicate success. If the function returns false,

    then ActiveQt will process the data by setting the properties

    through the meta object system.

    If you reimplement this function you also have to implement

    writeData().  The default implementation does nothing and returns

    false.

    \warning ActiveX controls embedded in HTML can use either the 

    \c type and \c data attribute of the \c object tag to read data,

    or use a list of \c param tags to initialize properties. If

    \c param tags are used, then Internet Explorer will ignore the

    \c data attribute, and readData will not be called.

    \sa writeData()

*/

bool QAxBindable::readData(QIODevice *source, const QString &format)

{

    Q_UNUSED(source);

    Q_UNUSED(format);

    return false;

}

/*!

    \since 4.1

    If the COM object supports a MIME type then this function is called

    to store the COM object into \a sink.

    You have to open \a sink for writing before you can write to it.

    Returns true to indicate success. If the function returns false,

    then ActiveQt will serialize the object by storing the property

    values.

    If you reimplement this function you also have to implement

    readData(). The default implementation does nothing and returns

    false.

    \sa readData()

*/

bool QAxBindable::writeData(QIODevice *sink)

{

    Q_UNUSED(sink);

    return false;

}

/*!

    \class QAxAggregated

    \brief The QAxAggregated class is an abstract base class for implementations of

    additional COM interfaces.

    \inmodule QAxServer

    Create a subclass of QAxAggregated and reimplement

    queryInterface() to support additional COM interfaces. Use

    multiple inheritance from those COM interfaces. Implement the

    IUnknown interface of those COM interfaces by delegating the

    calls to \c QueryInterface(), \c AddRef() and \c Release() to the

    interface provided by controllingUnknown().

    Use the widget() method if you need to make calls to the QWidget

    implementing the ActiveX control. You must not store that pointer

    in your subclass (unless you use QPointer), as the QWidget can

    be destroyed by the ActiveQt framework at any time.

    \sa QAxBindable, QAxFactory, {ActiveQt Framework}

*/

/*!

    \fn QAxAggregated::~QAxAggregated()

    The destructor is called internally by Qt.

*/

/*!

    \fn long QAxAggregated::queryInterface(const QUuid &iid, void **iface)

    Reimplement this pure virtual function to support additional COM

    interfaces. Set the value of \a iface to point to this object to

    support the interface \a iid. Note that you must cast the \c

    this pointer to the appropriate superclass.

    \snippet doc/src/snippets/code/src_activeqt_control_qaxbindable.cpp 2

    Return the standard COM results \c S_OK (interface is supported)

    or \c E_NOINTERFACE (requested interface is not supported).

    \warning

    Even though you must implement the \c IUnknown interface if you

    implement any COM interface you must not support the \c IUnknown

    interface in your queryInterface() implementation.

*/

/*!

    \fn IUnknown *QAxAggregated::controllingUnknown() const

    Returns the \c IUnknown interface of the ActiveX control. Implement

    the \c IUnknown interface in your QAxAggregated subclass to

    delegate calls to \c QueryInterface(), \c AddRef(), and \c

    Release() to the interface provided by this function.

    \snippet doc/src/snippets/code/src_activeqt_control_qaxbindable.cpp 3

    Instead of declaring and implementing these three functions

    manually, you can use the \c QAXAGG_IUNKNOWN macro in the class

    declaration of your subclass.

*/

/*!

    \fn QObject *QAxAggregated::object() const

    Returns a pointer to the QObject subclass implementing the COM object.

    This function might return 0.

    \warning

    You must not store the returned pointer, unless you use a

    QPointer, since the QObject can be destroyed by ActiveQt at any

    time.

*/

/*!

    \fn QWidget *QAxAggregated::widget() const

    Returns a pointer to the QWidget subclass implementing the ActiveX control.

    This function might return 0.

    \warning

    You must not store the returned pointer, unless you use a

    QPointer, since the QWidget can be destroyed by ActiveQt at any

    time.

*/

QT_END_NAMESPACE

#endif // QT_NO_WIN_ACTIVEQT