91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
/*
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* Copyright 2011 Aaron Seigo <aseigo@kde.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <QUrl>
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#include <QDebug>
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#include "customDataContainersEngine.h"
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#include "httpContainer.h"
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/*
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This DataEngine shows how to use a subclass of DataContainer to create and
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manage sources. This is particularly useful when managing asynchronous requests,
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such as sources that reflect network, D-Bus, etc. results.
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*/
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DataContainersEngine::DataContainersEngine(QObject *parent, const QVariantList &args)
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: Plasma::DataEngine(parent, args)
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{
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// We've passed the constructor's args to our parent class.
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// We're done for now!
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}
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bool DataContainersEngine::sourceRequestEvent(const QString &source)
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{
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// This engine will fetch webpages over http. First thing we do is check
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// the source to make sure it is indeed an http URL.
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QUrl url(source);
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qDebug() << "goin to fetch" << source << url << url.scheme();
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if (!url.scheme().startsWith("http", Qt::CaseInsensitive)) {
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return false;
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}
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// Create a HttpContainer, which is a subclass of Plasma::DataContainer
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HttpContainer *container = new HttpContainer(url, this);
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// Set the object name to be the same as the source name; DataEngine
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// relies on this to identify the container. This could also be done
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// in HttpContainer's constructor, but for the sake of this example
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// we're dong it here to show that it must be done *before* the
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// DataContainer subclass is passed to addSource
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container->setObjectName(source);
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// Now we tell Plasma::DataEngine about this new container
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addSource(container);
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// Since we successfully set up the source, return true
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return true;
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}
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bool DataContainersEngine::updateSourceEvent(const QString &source)
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{
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HttpContainer *container = qobject_cast<HttpContainer *>(containerForSource(source));
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if (container) {
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container->fetchUrl();
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}
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// HttpContainer is asynchronous, so the data hasn't actually been updated yet. So
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// we return false here to let the DataEngine know that nothing has changed quite yet.
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return false;
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}
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// export the plugin; use the plugin name and the class name
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K_EXPORT_PLASMA_DATAENGINE_WITH_JSON(org.kde.examples.customDataContainers, DataContainersEngine, "plasma-dataengine-example-customDataContainers.json")
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// include the moc file so the build system makes it for us
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#include "customDataContainersEngine.moc"
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