hswidgetmodel/src/hswidgetfactory.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Mar 2010 09:35:23 +0200
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  HsWidget factory.
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*
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*/
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#include <QStringList>
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#include <QDir>
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#include <QPluginLoader>
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#include "hswidgetfactory.h"
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#include "hswidgetfactory_p.h"
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#include "hswidget.h"
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#include "hswidgetprovidermanifest.h"
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#include "hstest_global.h"
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/*!
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    \class HsPluginUnloader
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    \ingroup group_hswidgetmodel
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    \brief Unloads plugin and deletes plugin loader.
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    Holds plugin loader instance and unloads and destroys plugin
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    on it's destructor. 
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*/
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/*!
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    \fn HsPluginUnloader::HsPluginUnloader(QPluginLoader *pluginLoader,QObject *parent)
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    Constructs plugin unloader object. When this object is destroyed it 
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    unloads it's pointed \a pluginLoader instance.
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*/
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HsPluginUnloader::HsPluginUnloader(QPluginLoader *pluginLoader,QObject *parent)
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    :QObject(parent),mPluginLoader(pluginLoader)
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{
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}
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/*!
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    \fn HsPluginUnloader::~HsPluginUnloader()
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    Unloads it's plugin loader instance.
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*/
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HsPluginUnloader::~HsPluginUnloader()
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{
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    if(mPluginLoader) {
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        mPluginLoader->unload();
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        delete mPluginLoader; 
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    }
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}
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/*!
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    \class HsWidgetFactory 
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    \ingroup group_hswidgetmodel
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    \brief Finds and creates home screen widgets.
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    HsWidget factory creates an instance of
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    a widget base on a widget token that is given to it.
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*/
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HsWidgetFactoryPrivate::HsWidgetFactoryPrivate(HsWidgetFactory *factory):
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    mPublic(factory)
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{
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}
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HsWidgetFactoryPrivate::~HsWidgetFactoryPrivate()
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{
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}
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HsWidget* HsWidgetFactoryPrivate::createWidget(const HsWidgetToken &token)
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{
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   QPluginLoader* loader = new QPluginLoader(token.mLibrary);
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   QObject* plugin = loader->instance();
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   IHsWidgetProvider* provider = qobject_cast<IHsWidgetProvider*>(plugin);
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   HsWidget* widget(0);
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   if (provider) {
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       widget = provider->createWidget(token);
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       if (!widget) {
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          HSDEBUG("Widget creation failed.")
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          loader->unload();
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          delete loader;
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       }
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       else {
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           HsPluginUnloader* p = new HsPluginUnloader(loader);
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           p->connect(widget,SIGNAL(destroyed()),SLOT(deleteLater()));
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       }
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    }
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   else {
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        HSDEBUG("Widget creation failed - No provider.")
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        loader->unload();
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        delete loader;
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   }
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    return widget;
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}
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/*!
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    Constructor
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*/
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HsWidgetFactory::HsWidgetFactory(QObject *parent)
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    : QObject(parent),mD(new HsWidgetFactoryPrivate(this))
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{
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}
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/*!
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    Destructor
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*/
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HsWidgetFactory::~HsWidgetFactory()
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{
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    delete mD;
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}
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/*!
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    Creates and returns a widget based on given \a token
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*/
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HsWidget* HsWidgetFactory::createWidget(const HsWidgetToken &token)
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{
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    return mD->createWidget(token);
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}
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