plasma-framework/declarativeimports/core/datamodel.cpp

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/*
* 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.h"
#include <QTimer>
#include <KDebug>
namespace Plasma
{
SortFilterModel::SortFilterModel(QObject* parent)
: QSortFilterProxyModel(parent)
{
setObjectName("SortFilterModel");
setDynamicSortFilter(true);
connect(this, SIGNAL(rowsInserted(const QModelIndex &, int, int)),
this, SIGNAL(countChanged()));
connect(this, SIGNAL(rowsRemoved(const QModelIndex &, int, int)),
this, SIGNAL(countChanged()));
connect(this, SIGNAL(modelReset()),
this, SIGNAL(countChanged()));
}
SortFilterModel::~SortFilterModel()
{
}
void SortFilterModel::syncRoleNames()
{
m_roleIds.clear();
setRoleNames(sourceModel()->roleNames());
QHash<int, QByteArray>::const_iterator i;
for (i = roleNames().constBegin(); i != roleNames().constEnd(); ++i) {
m_roleIds[i.value()] = i.key();
}
setFilterRole(m_filterRole);
setSortRole(m_sortRole);
}
int SortFilterModel::roleNameToId(const QString &name)
{
if (!m_roleIds.contains(name)) {
return Qt::DisplayRole;
}
return m_roleIds.value(name);
}
void SortFilterModel::setModel(QObject *source)
{
QAbstractItemModel *model = qobject_cast<QAbstractItemModel *>(source);
if (!model) {
kWarning() << "Error: QAbstractItemModel type expected";
return;
}
connect(model, SIGNAL(modelReset()), this, SLOT(syncRoleNames()));
QSortFilterProxyModel::setSourceModel(model);
}
void SortFilterModel::setFilterRegExp(const QString &exp)
{
//FIXME: this delaying of the reset signal seems to make the views behave a bit better, i.e. less holes and avoids some crashes, in theory shouldn't be necessary
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beginResetModel();
blockSignals(true);
QSortFilterProxyModel::setFilterRegExp(QRegExp(exp, Qt::CaseInsensitive));
blockSignals(false);
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endResetModel();
}
QString SortFilterModel::filterRegExp() const
{
return QSortFilterProxyModel::filterRegExp().pattern();
}
void SortFilterModel::setFilterRole(const QString &role)
{
QSortFilterProxyModel::setFilterRole(roleNameToId(role));
m_filterRole = role;
}
QString SortFilterModel::filterRole() const
{
return m_filterRole;
}
void SortFilterModel::setSortRole(const QString &role)
{
QSortFilterProxyModel::setSortRole(roleNameToId(role));
m_sortRole = role;
sort(0, sortOrder());
}
QString SortFilterModel::sortRole() const
{
return m_sortRole;
}
void SortFilterModel::setSortOrder(const Qt::SortOrder order)
{
sort(0, order);
}
DataModel::DataModel(QObject* parent)
: QAbstractItemModel(parent),
m_dataSource(0),
m_maxRoleId(Qt::UserRole+1)
{
//There is one reserved role name: DataEngineSource
m_roleNames[m_maxRoleId] = "DataEngineSource";
m_roleIds["DataEngineSource"] = m_maxRoleId;
++m_maxRoleId;
setObjectName("DataModel");
connect(this, SIGNAL(rowsInserted(const QModelIndex &, int, int)),
this, SIGNAL(countChanged()));
connect(this, SIGNAL(rowsRemoved(const QModelIndex &, int, int)),
this, SIGNAL(countChanged()));
connect(this, SIGNAL(modelReset()),
this, SIGNAL(countChanged()));
}
DataModel::~DataModel()
{
}
void DataModel::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
{
if (!m_sourceFilter.isEmpty() && m_sourceFilterRE.isValid() && !m_sourceFilterRE.exactMatch(sourceName)) {
return;
}
if (m_keyRoleFilter.isEmpty()) {
//an item is represented by a source: keys are roles m_roleLevel == FirstLevel
QVariantList list;
if (!m_dataSource->data().isEmpty()) {
QVariantHash::const_iterator i = m_dataSource->data().constBegin();
while (i != m_dataSource->data().constEnd()) {
QVariant value = i.value();
if (value.isValid() && value.canConvert<Plasma::DataEngine::Data>()) {
Plasma::DataEngine::Data data = value.value<Plasma::DataEngine::Data>();
data["DataEngineSource"] = i.key();
list.append(data);
}
++i;
}
}
setItems(QString(), list);
} else {
//a key that matches the one we want exists and is a list of DataEngine::Data
if (data.contains(m_keyRoleFilter) &&
data.value(m_keyRoleFilter).canConvert<QVariantList>()) {
setItems(sourceName, data.value(m_keyRoleFilter).value<QVariantList>());
} else if (m_keyRoleFilterRE.isValid()) {
//try to match the key we want with a regular expression if set
QVariantList list;
QHash<QString, QVariant>::const_iterator i;
for (i = data.constBegin(); i != data.constEnd(); ++i) {
if (m_keyRoleFilterRE.exactMatch(i.key())) {
list.append(i.value());
}
}
setItems(sourceName, 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;
}
if (m_dataSource) {
disconnect(m_dataSource, 0, this, 0);
}
m_dataSource = source;
const QHash<QString, QVariant> data = source->data();
QHash<QString, QVariant>::const_iterator i = data.constBegin();
while (i != data.constEnd()) {
dataUpdated(i.key(), i.value().value<Plasma::DataEngine::Data>());
++i;
}
connect(m_dataSource, SIGNAL(newData(const QString &, const Plasma::DataEngine::Data &)),
this, SLOT(dataUpdated(const QString &, const Plasma::DataEngine::Data &)));
connect(m_dataSource, SIGNAL(sourceRemoved(const QString &)), this, SLOT(removeSource(const QString &)));
connect(m_dataSource, SIGNAL(sourceDisconnected(const QString &)), this, SLOT(removeSource(const QString &)));
}
QObject *DataModel::dataSource() const
{
return m_dataSource;
}
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void DataModel::setKeyRoleFilter(const QString& key)
{
// the "key role filter" can be used in one of three ways:
//
// 1) empty string -> all data is used, each source is one row in the model
// 2) matches a key in the data exactly -> only that key/value pair is used, and the value is
// treated as a collection where each item in the collection becomes a row in the model
// 3) regular expression -> matches zero or more keys in the data, and each matching key/value
// pair becomes a row in the model
if (m_keyRoleFilter == key) {
return;
}
m_keyRoleFilter = key;
m_keyRoleFilterRE = QRegExp(m_keyRoleFilter);
}
QString DataModel::keyRoleFilter() const
{
return m_keyRoleFilter;
}
void DataModel::setSourceFilter(const QString& key)
{
if (m_sourceFilter == key) {
return;
}
m_sourceFilter = key;
m_sourceFilterRE = QRegExp(key);
/*
FIXME: if the user changes the source filter, it won't immediately be reflected in the
available data
if (m_sourceFilterRE.isValid()) {
.. iterate through all items and weed out the ones that don't match ..
}
*/
}
QString DataModel::sourceFilter() const
{
return m_sourceFilter;
}
void DataModel::setItems(const QString &sourceName, const QVariantList &list)
{
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beginResetModel();
//convert to vector, so data() will be O(1)
m_items[sourceName] = list.toVector();
if (!list.isEmpty()) {
if (list.first().canConvert<QVariantHash>()) {
foreach (const QVariant &item, list) {
const QVariantHash &vh = item.value<QVariantHash>();
QHashIterator<QString, QVariant> it(vh);
while (it.hasNext()) {
it.next();
const QString &roleName = it.key();
if (!m_roleIds.contains(roleName)) {
++m_maxRoleId;
m_roleNames[m_maxRoleId] = roleName.toLatin1();
m_roleIds[roleName] = m_maxRoleId;
}
}
}
} else {
foreach (const QVariant &item, list) {
const QVariantMap &vh = item.value<QVariantMap>();
QMapIterator<QString, QVariant> it(vh);
while (it.hasNext()) {
it.next();
const QString &roleName = it.key();
if (!m_roleIds.contains(roleName)) {
++m_maxRoleId;
m_roleNames[m_maxRoleId] = roleName.toLatin1();
m_roleIds[roleName] = m_maxRoleId;
}
}
}
}
setRoleNames(m_roleNames);
}
setRoleNames(m_roleNames);
//make the declarative view reload everything,
//would be nice an incremental update but is not possible
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endResetModel();
}
void DataModel::removeSource(const QString &sourceName)
{
//FIXME: this could be way more efficient by not resetting the whole model
//FIXME: find a way to remove only the proper things also in the case where sources are items
if (m_keyRoleFilter.isEmpty()) {
//source name in the map, linear scan
for (int i = 0; i < m_items.value(QString()).count(); ++i) {
if (m_items.value(QString())[i].value<QVariantHash>().value("DataEngineSource") == sourceName) {
beginResetModel();
m_items[QString()].remove(i);
endResetModel();
break;
}
}
} else {
//source name as key of the map
if (m_items.contains(sourceName)) {
beginResetModel();
m_items.remove(sourceName);
endResetModel();
}
}
}
QVariant DataModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid() || index.column() > 0 ||
index.row() < 0 || index.row() >= countItems()){
return QVariant();
}
int count = 0;
int actualRow = 0;
QString source;
QMap<QString, QVector<QVariant> >::const_iterator i;
for (i = m_items.constBegin(); i != m_items.constEnd(); ++i) {
const int oldCount = count;
count += i.value().count();
if (index.row() < count) {
source = i.key();
actualRow = index.row() - oldCount;
break;
}
}
//is it the reserved role: DataEngineSource ?
//also, if each source is an item DataEngineSource is a role between all the others, otherwise we know it from the role variable
//finally, sub items are some times QVariantHash some times QVariantMaps
if (!m_keyRoleFilter.isEmpty() && m_roleNames.value(role) == "DataEngineSource") {
return source;
} else if (m_items.value(source).value(actualRow).canConvert<QVariantHash>()) {
return m_items.value(source).value(actualRow).value<QVariantHash>().value(m_roleNames.value(role));
} else {
return m_items.value(source).value(actualRow).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 >= countItems()) {
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 countItems();
}
int DataModel::columnCount(const QModelIndex &parent) const
{
if (parent.isValid()) {
return 0;
}
return 1;
}
int DataModel::roleNameToId(const QString &name)
{
if (!m_roleIds.contains(name)) {
return -1;
}
return m_roleIds.value(name);
}
}
#include "datamodel.moc"