plasma-framework/declarativeimports/core/datamodel.cpp
Marco Martin 1dcc19c800 delay the reset signal after a setFilterRegExp: seems to make views behave a bit better:
avoids "holes" and some crash

svn path=/trunk/KDE/kdebase/runtime/; revision=1204228
2010-12-06 13:28:45 +00:00

340 lines
9.2 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
{
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 -1;
}
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
blockSignals(true);
QSortFilterProxyModel::setFilterRegExp(QRegExp(exp, Qt::CaseInsensitive));
blockSignals(false);
reset();
}
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)
{
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_keyRoleFilter.isEmpty()) {
//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>());
//try to match the key we want with a regular expression if set
} else {
QRegExp regExp(m_keyRoleFilter);
if (regExp.isValid()) {
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(sourceName, list);
}
}
//an item is represented by a source: keys are roles m_roleLevel == FirstLevel
} else {
QVariantList list;
foreach (QVariant data, m_dataSource->data()) {
list.append(data.value<Plasma::DataEngine::Data>());
}
setItems(QString(), 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 &)));
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;
}
void DataModel::setKeyRoleFilter(const QString key)
{
if (m_keyRoleFilter == key) {
return;
}
m_keyRoleFilter = key;
}
QString DataModel::keyRoleFilter() const
{
return m_keyRoleFilter;
}
void DataModel::setItems(const QString &sourceName, const QVariantList &list)
{
emit modelAboutToBeReset();
//convert to vector, so data() will be O(1)
m_items[sourceName] = list.toVector();
if (!list.isEmpty()) {
int role = Qt::UserRole;
m_roleNames.clear();
m_roleIds.clear();
if (list.first().canConvert<QVariantHash>()) {
foreach (const QString& roleName, list.first().value<QVariantHash>().keys()) {
++role;
m_roleNames[role] = roleName.toLatin1();
m_roleIds[roleName] = role;
}
} else {
foreach (const QString& roleName, list.first().value<QVariantMap>().keys()) {
++role;
m_roleNames[role] = roleName.toLatin1();
m_roleIds[roleName] = role;
}
}
setRoleNames(m_roleNames);
}
//make the declarative view reload everything,
//would be nice an incremental update but is not possible
emit modelReset();
}
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
emit modelAboutToBeReset();
m_items.remove(sourceName);
emit modelReset();
}
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;
}
}
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"