plasma-framework/declarativeimports/core/datasource.cpp

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/*
* Copyright 2009 by Alan Alpert <alan.alpert@nokia.com>
* Copyright 2010 by Ménard Alexis <menard@kde.org>
* Copyright 2010 by Marco MArtin <mart@kde.org>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "datasource_p.h"
#include "qdeclarativeengine.h"
#include "qdeclarativecontext.h"
#include <Plasma/Applet>
namespace Plasma
{
DataSource::DataSource(QObject* parent)
: QObject(parent),
m_interval(1000),
m_dataEngine(0)
{
setObjectName("DataSource");
connect(this, SIGNAL(engineChanged()),
this, SLOT(setupData()));
connect(this, SIGNAL(connectedSourcesChanged()),
this, SLOT(setupData()), Qt::QueuedConnection);
connect(this, SIGNAL(intervalChanged()),
this, SLOT(setupData()));
}
void DataSource::setConnectedSources(const QStringList &sources)
{
foreach (const QString &source, sources) {
if (!m_connectedSources.contains(source)) {
m_newSources.append(source);
}
}
foreach (const QString &source, m_connectedSources) {
if (!sources.contains(source)) {
m_oldSources.append(source);
}
}
if (!m_newSources.isEmpty() || !m_oldSources.isEmpty()) {
m_connectedSources = sources;
m_changes |= SourcesChanged;
emit connectedSourcesChanged();
}
}
void DataSource::setEngine(const QString &e)
{
if (e == m_engine) {
return;
}
m_engine = e;
m_changes |= DataEngineChanged;
emit engineChanged();
}
void DataSource::setInterval(const int interval)
{
if (interval == m_interval) {
return;
}
m_interval = interval;
m_changes |= DataEngineChanged;
emit intervalChanged();
}
//TODO: event compression for this
void DataSource::setupData()
{
if (m_changes & DataEngineChanged) {
if (m_dataEngine) {
foreach (const QString &source, m_connectedSources) {
m_dataEngine->disconnectSource(source, this);
}
}
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qDeleteAll(m_services);
m_services.clear();
m_dataEngine = dataEngine(m_engine);
if (!m_dataEngine) {
kWarning() << "DataEngine" << m_engine << "not found";
return;
}
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connect(m_dataEngine, SIGNAL(sourceAdded(const QString&)), this, SIGNAL(sourcesChanged()));
connect(m_dataEngine, SIGNAL(sourceRemoved(const QString&)), this, SIGNAL(sourcesChanged()));
connect(m_dataEngine, SIGNAL(sourceAdded(const QString&)), this, SIGNAL(sourceAdded(const QString&)));
connect(m_dataEngine, SIGNAL(sourceRemoved(const QString&)), this, SLOT(removeSource(const QString&)));
connect(m_dataEngine, SIGNAL(sourceRemoved(const QString&)), this, SIGNAL(sourceRemoved(const QString&)));
//TODO: remove after event compression done
if (!(m_changes & SourcesChanged)) {
foreach (const QString &source, m_connectedSources) {
m_dataEngine->connectSource(source, this, m_interval);
emit sourceConnected(source);
}
}
}
if (m_changes & SourcesChanged) {
if (m_dataEngine) {
foreach (const QString &source, m_oldSources) {
m_dataEngine->disconnectSource(source, this);
emit sourceDisconnected(source);
}
foreach (const QString &source, m_newSources) {
m_dataEngine->connectSource(source, this, m_interval);
emit sourceConnected(source);
}
m_oldSources.clear();
m_newSources.clear();
}
}
m_changes = NoChange;
}
void DataSource::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
{
//it can arrive also data we don't explicitly connected a source
if (m_connectedSources.contains(sourceName)) {
m_data.insert(sourceName.toLatin1(), data);
emit dataChanged();
emit newData(sourceName, data);
} else if (m_dataEngine) {
m_dataEngine->disconnectSource(sourceName, this);
}
}
void DataSource::removeSource(const QString &source)
{
m_data.remove(source);
//TODO: emit those signals as last thing
if (m_connectedSources.contains(source)) {
emit sourceDisconnected(source);
emit connectedSourcesChanged();
}
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if (m_dataEngine) {
m_connectedSources.removeAll(source);
m_newSources.removeAll(source);
m_oldSources.removeAll(source);
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QHash<QString, Plasma::Service *>::iterator it = m_services.find(source);
if (it != m_services.end()) {
delete it.value();
m_services.erase(it);
}
}
}
QStringList DataSource::keysForSource(const QString &source) const
{
if (!m_data.contains(source)) {
return QStringList();
}
return m_data.value(source).value<Data>().keys();
}
Plasma::Service *DataSource::serviceForSource(const QString &source)
{
if (!m_services.contains(source)) {
m_services[source] = m_dataEngine->serviceForSource(source);
}
return m_services.value(source);
}
void DataSource::connectSource(const QString &source)
{
if (m_connectedSources.contains(source)) {
return;
}
m_newSources.append(source);
m_connectedSources.append(source);
m_changes |= SourcesChanged;
emit sourceConnected(source);
emit connectedSourcesChanged();
}
void DataSource::disconnectSource(const QString &source)
{
m_oldSources.append(source);
m_connectedSources.removeAll(source);
m_changes |= SourcesChanged;
emit sourceDisconnected(source);
emit connectedSourcesChanged();
}
}
#include "datasource_p.moc"