/**************************************************************************** ** ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the ActiveQt framework of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** You may use this file under the terms of the BSD license as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names ** of its contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qaxbindable.h" #ifndef QT_NO_WIN_ACTIVEQT #include #include // 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