servicebrowser.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Mobility Components.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 Nokia Corporation 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 <QtGui>

 #include <qservicemanager.h>
 #include <qserviceinterfacedescriptor.h>

 #include "servicebrowser.h"
 #include "qplatformdefs.h"

 Q_DECLARE_METATYPE(QServiceInterfaceDescriptor)

 ServiceBrowser::ServiceBrowser(QWidget *parent, Qt::WindowFlags flags)
     : QWidget(parent, flags)
 {
     serviceManager = new QServiceManager(this);
     systemManager = new QServiceManager(QService::SystemScope);

 #ifndef Q_OS_SYMBIAN
     registerExampleServices();
 #endif
     initWidgets();
     reloadServicesList();

     setWindowTitle(tr("Services Browser"));
 }

 ServiceBrowser::~ServiceBrowser()
 {
 #ifndef Q_OS_SYMBIAN
     unregisterExampleServices();
 #endif
 }

 void ServiceBrowser::currentInterfaceImplChanged(QListWidgetItem *current, QListWidgetItem *previous)
 {
     Q_UNUSED(previous);
     if (!current)
         return;

     reloadAttributesList();
     reloadAttributesRadioButtonText();

     QServiceInterfaceDescriptor descriptor = current->data(Qt::UserRole).value<QServiceInterfaceDescriptor>();
     if (descriptor.isValid()) {
 #if defined(Q_WS_MAEMO_5)
         defaultInterfaceButton->setText(tr("Set as default implementation for \n%1").arg(descriptor.interfaceName()));
 #else
         defaultInterfaceButton->setText(tr("Set as default implementation for %1").arg(descriptor.interfaceName()));
 #endif
         defaultInterfaceButton->setEnabled(true);
     }
 }

 void ServiceBrowser::reloadServicesList()
 {
     servicesListWidget->clear();

     QSet<QString> services;
     QList<QServiceInterfaceDescriptor> descriptors = serviceManager->findInterfaces();
     for (int i=0; i<descriptors.count(); i++) {
         QString service = descriptors[i].serviceName();

         if (descriptors[i].scope() == QService::SystemScope)
             service += tr(" (system)");

         services << service;
     }

     foreach (const QString& service, services)
         servicesListWidget->addItem(service);

     servicesListWidget->sortItems();
     servicesListWidget->addItem(showAllServicesItem);
 }

 void ServiceBrowser::reloadInterfaceImplementationsList()
 {
     QString serviceName;
     if (servicesListWidget->currentItem()
             && servicesListWidget->currentItem() != showAllServicesItem) {
         serviceName = servicesListWidget->currentItem()->text();
         interfacesGroup->setTitle(tr("Interfaces implemented by %1").arg(serviceName));
     } else {
         interfacesGroup->setTitle(tr("All interface implementations"));
     }

     QServiceManager *manager = serviceManager;
     if (serviceName.endsWith(" (system)")) {
         serviceName.chop(9);
         manager = systemManager;
     }

     QList<QServiceInterfaceDescriptor> descriptors = manager->findInterfaces(serviceName);

     attributesListWidget->clear();
     interfacesListWidget->clear();
     for (int i=0; i<descriptors.count(); i++) {
         if (descriptors[i].scope() != manager->scope() && !serviceName.isEmpty())
             continue;

         QString text = QString("%1 %2.%3")
                 .arg(descriptors[i].interfaceName())
                 .arg(descriptors[i].majorVersion())
                 .arg(descriptors[i].minorVersion());

         QServiceInterfaceDescriptor defaultInterfaceImpl
             = manager->interfaceDefault(descriptors[i].interfaceName());

         if (serviceName.isEmpty()) {
             text += " (" + descriptors[i].serviceName() + ")";

             if (descriptors[i].scope() == QService::SystemScope) {
                 text += tr(" (system");
                 defaultInterfaceImpl = systemManager->interfaceDefault(descriptors[i].interfaceName());
                 if (descriptors[i] == defaultInterfaceImpl)
                     text += tr(" default)");
                 else
                     text += ")";
                 defaultInterfaceImpl = QServiceInterfaceDescriptor();
             }
         }

         if (descriptors[i] == defaultInterfaceImpl)
             text += tr(" (default)");

         QListWidgetItem *item = new QListWidgetItem(text);
         item->setData(Qt::UserRole, qVariantFromValue(descriptors[i]));
         interfacesListWidget->addItem(item);
     }

     defaultInterfaceButton->setEnabled(false);
 }

 void ServiceBrowser::reloadAttributesList()
 {
     QListWidgetItem *item = interfacesListWidget->currentItem();
     if (!item)
         return;

     QServiceInterfaceDescriptor selectedImpl =
             item->data(Qt::UserRole).value<QServiceInterfaceDescriptor>();

     QObject *implementationRef;
     if (selectedImplRadioButton->isChecked())
         implementationRef = serviceManager->loadInterface(selectedImpl, 0, 0);
     else
         implementationRef = serviceManager->loadInterface(selectedImpl.interfaceName(), 0, 0);

     attributesListWidget->clear();
     if (!implementationRef) {
         attributesListWidget->addItem(tr("(Error loading service plugin)"));
         return;
     }

     const QMetaObject *metaObject = implementationRef->metaObject();
     attributesGroup->setTitle(tr("Invokable attributes for %1 class")
             .arg(QString(metaObject->className())));
     for (int i=0; i<metaObject->methodCount(); i++) {
         QMetaMethod method = metaObject->method(i);
         attributesListWidget->addItem("[METHOD] " + QString(method.signature()));
     }
     for (int i=0; i<metaObject->propertyCount(); i++) {
         QMetaProperty property = metaObject->property(i);
         attributesListWidget->addItem("[PROPERTY] " + QString(property.name()));
     }
 }

 void ServiceBrowser::setDefaultInterfaceImplementation()
 {
     QListWidgetItem *item = interfacesListWidget->currentItem();
     if (!item)
         return;

     QServiceInterfaceDescriptor descriptor = item->data(Qt::UserRole).value<QServiceInterfaceDescriptor>();
     if (descriptor.isValid()) {
         QServiceManager *manager = serviceManager;

         if (descriptor.scope() == QService::SystemScope)
             manager = systemManager;

         if (manager->setInterfaceDefault(descriptor)) {
             int currentIndex = interfacesListWidget->row(item);
             reloadInterfaceImplementationsList();
             interfacesListWidget->setCurrentRow(currentIndex);
         } else {
             qWarning() << "Unable to set default service for interface:"
                     << descriptor.interfaceName();
         }
     }
 }

 void ServiceBrowser::registerExampleServices()
 {
     QStringList exampleXmlFiles;
     exampleXmlFiles << "filemanagerservice.xml" << "bluetoothtransferservice.xml";
     foreach (const QString &fileName, exampleXmlFiles) {
         const QString path = QCoreApplication::applicationDirPath() + "/xmldata/" + fileName;
         serviceManager->addService(path);
     }
 }

 void ServiceBrowser::unregisterExampleServices()
 {
     serviceManager->removeService("FileManagerService");
     serviceManager->removeService("BluetoothTransferService");
 }

 void ServiceBrowser::reloadAttributesRadioButtonText()
 {
     QListWidgetItem *item = interfacesListWidget->currentItem();
     if (!item)
         return;

     QServiceInterfaceDescriptor selectedImpl =
             item->data(Qt::UserRole).value<QServiceInterfaceDescriptor>();
     QServiceInterfaceDescriptor defaultImpl =
             serviceManager->interfaceDefault(selectedImpl.interfaceName());

     defaultImplRadioButton->setText(tr("Default implementation for %1\n(currently provided by %2)")
             .arg(defaultImpl.interfaceName())
             .arg(defaultImpl.serviceName()));
 }

 void ServiceBrowser::initWidgets()
 {
     showAllServicesItem = new QListWidgetItem(tr("(All registered services)"));

     servicesListWidget = new QListWidget;
     interfacesListWidget = new QListWidget;
     interfacesListWidget->addItem(tr("(Select a service)"));
     attributesListWidget = new QListWidget;
     attributesListWidget->addItem(tr("(Select an interface implementation)"));

     connect(servicesListWidget, SIGNAL(currentItemChanged(QListWidgetItem*,QListWidgetItem*)),
             this, SLOT(reloadInterfaceImplementationsList()));

     connect(interfacesListWidget, SIGNAL(currentItemChanged(QListWidgetItem*,QListWidgetItem*)),
             this, SLOT(currentInterfaceImplChanged(QListWidgetItem*,QListWidgetItem*)));

     defaultInterfaceButton = new QPushButton(tr("Set as default implementation"));
     defaultInterfaceButton->setEnabled(false);
     connect(defaultInterfaceButton, SIGNAL(clicked()),
             this, SLOT(setDefaultInterfaceImplementation()));

     selectedImplRadioButton = new QRadioButton(tr("Selected interface implementation"));
     defaultImplRadioButton = new QRadioButton(tr("Default implementation"));
     selectedImplRadioButton->setChecked(true);

     QButtonGroup *radioButtons = new QButtonGroup(this);
     radioButtons->addButton(selectedImplRadioButton);
     radioButtons->addButton(defaultImplRadioButton);
     connect(radioButtons, SIGNAL(buttonClicked(QAbstractButton*)),
             this, SLOT(reloadAttributesList()));

     QGroupBox *servicesGroup = new QGroupBox(tr("Show services for:"));
     QVBoxLayout *servicesLayout = new QVBoxLayout;
     servicesLayout->addWidget(servicesListWidget);
     servicesGroup->setLayout(servicesLayout);

     interfacesGroup = new QGroupBox(tr("Interface implementations"));
     QVBoxLayout *interfacesLayout = new QVBoxLayout;
     interfacesLayout->addWidget(interfacesListWidget);
     interfacesLayout->addWidget(defaultInterfaceButton);
     interfacesGroup->setLayout(interfacesLayout);

     attributesGroup = new QGroupBox(tr("Invokable attributes"));
     QVBoxLayout *attributesLayout = new QVBoxLayout;
     attributesLayout->addWidget(attributesListWidget);
 #if !defined(Q_WS_MAEMO_5)
     // No space on the screen to show following title in Maemo
     attributesLayout->addWidget(new QLabel(tr("Show attributes for:")));
 #endif
     attributesLayout->addWidget(selectedImplRadioButton);
     attributesLayout->addWidget(defaultImplRadioButton);
     attributesGroup->setLayout(attributesLayout);

 #if defined(Q_WS_MAEMO_5)
     // Maemo 5 style doesn't take group box titles into account.
     int spacingHack = QFontMetrics(QFont()).height();
     interfacesLayout->setContentsMargins(0, spacingHack, 0, 0);
     attributesLayout->setContentsMargins(0, spacingHack, 0, 0);
     servicesLayout->setContentsMargins(0, spacingHack, 0, 0);
 #endif
 #if defined(MEEGO_EDITION_HARMATTAN)
     QGridLayout *layout = new QGridLayout;
     layout->addWidget(servicesGroup, 0, 0);
     layout->addWidget(attributesGroup, 0, 1, 2, 1);
     layout->addWidget(interfacesGroup, 1, 0);
 #else
     QVBoxLayout *layout = new QVBoxLayout;
     QStackedLayout *stackedLayout = new QStackedLayout;
     stackedLayout->addWidget(servicesGroup);
     stackedLayout->addWidget(interfacesGroup);
     stackedLayout->addWidget(attributesGroup);

     QComboBox *pageComboBox = new QComboBox;
     pageComboBox->addItem(tr("Services"));
     pageComboBox->addItem(tr("Interfaces"));
     pageComboBox->addItem(tr("Attributes"));
     connect(pageComboBox, SIGNAL(activated(int)),
             stackedLayout, SLOT(setCurrentIndex(int)));

     layout->addWidget(pageComboBox);
     layout->addLayout(stackedLayout);
 #endif

     setLayout(layout);
 }