plasma-framework/declarativeimports/core/datamodel.cpp
Marco Martin 27bff00756 the previous way to have models didn't work for most engines:
some have many keys one for each item.
bind a new DataModel into QML that will be associated to a specific DataSource and a key pattern

an exact one like "items" of rss
or a partial regexp one like "KnowledgeBase-[\d]*" like the ocs engine

in this way is not necessary to change how those dataengine works and is possible to use them in QML without headaches

svn path=/trunk/KDE/kdebase/runtime/; revision=1189953
2010-10-26 13:18:19 +00:00

175 lines
4.1 KiB
C++

/*
* 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 "datamodel.h"
#include "datasource_p.h"
#include <KDebug>
namespace Plasma
{
DataModel::DataModel(QObject* parent)
: QAbstractItemModel(parent),
m_dataSource(0)
{
setObjectName("DataModel");
}
DataModel::~DataModel()
{
}
void DataModel::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
{
Q_UNUSED(sourceName);
if (data.contains(m_key) && data.value(m_key).canConvert<QVariantList>()) {
setItems(data.value(m_key).value<QVariantList>());
} else {
QRegExp regExp(m_key);
if (!regExp.isValid()) {
return;
}
QHash<QString, QVariant>::const_iterator i;
QVariantList list;
for (i = data.constBegin(); i != data.constEnd(); ++i) {
if (regExp.exactMatch(i.key())) {
list.append(i.value());
}
}
setItems(list);
}
}
void DataModel::setDataSource(QObject *object)
{
DataSource *source = qobject_cast<DataSource *>(object);
if (!source) {
kWarning() << "Error: DataSource type expected";
return;
}
if (m_dataSource == source) {
return;
}
disconnect(m_dataSource, 0, this, 0);
m_dataSource = source;
connect(m_dataSource, SIGNAL(newData(const QString &, const Plasma::DataEngine::Data &)),
this, SLOT(dataUpdated(const QString &, const Plasma::DataEngine::Data &)));
}
QObject *DataModel::dataSource() const
{
return m_dataSource;
}
void DataModel::setKey(const QString key)
{
if (m_key == key) {
return;
}
m_key = key;
}
QString DataModel::key() const
{
return m_key;
}
void DataModel::setItems(const QVariantList &list)
{
emit modelAboutToBeReset();
//convert to vector, so data() will be O(1)
m_items = list.toVector();
int role = Qt::UserRole;
m_roleNames.clear();
foreach (QString roleName, list.first().value<QVariantMap>().keys()) {
++role;
m_roleNames[role] = roleName.toLatin1();
}
setRoleNames(m_roleNames);
//make the declarative view reload everything,
//would be nice an incremental update but is not possible
emit modelReset();
}
QVariant DataModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid() || index.column() > 0 ||
index.row() < 0 || index.row() >= m_items.count()){
return QVariant();
}
return m_items.value(index.row()).value<QVariantMap>().value(m_roleNames.value(role));
}
QVariant DataModel::headerData(int section, Qt::Orientation orientation, int role) const
{
Q_UNUSED(section)
Q_UNUSED(orientation)
Q_UNUSED(role)
return QVariant();
}
QModelIndex DataModel::index(int row, int column, const QModelIndex &parent) const
{
if (parent.isValid() || column > 0 || row < 0 || row >= m_items.count()) {
return QModelIndex();
}
return createIndex(row, column, 0);
}
QModelIndex DataModel::parent(const QModelIndex &child) const
{
Q_UNUSED(child)
return QModelIndex();
}
int DataModel::rowCount(const QModelIndex &parent) const
{
//this is not a tree
//TODO: make it possible some day?
if (parent.isValid()) {
return 0;
}
return m_items.count();
}
int DataModel::columnCount(const QModelIndex &parent) const
{
if (parent.isValid()) {
return 0;
}
return 1;
}
}
#include "datamodel.moc"