kganttsummaryhandlingproxymodel.cpp

/*
 * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
 *
 * This file is part of the KGantt library.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kganttsummaryhandlingproxymodel.h"
#include "kganttsummaryhandlingproxymodel_p.h"
 
#include <QDebug>
 
#include <cassert>
 
using namespace KGantt;
 
 
 
typedef ForwardingProxyModel BASE;
 
bool SummaryHandlingProxyModel::Private::cacheLookup( const QModelIndex& idx,
                                                      QPair<QDateTime,QDateTime>* result ) const
{
    //qDebug() << "cacheLookup("<<idx<<"), cache has " << cached_summary_items.count() << "items";
    QHash<QModelIndex,QPair<QDateTime,QDateTime> >::const_iterator it =
        cached_summary_items.constFind( idx );
    if ( it != cached_summary_items.constEnd() ) {
        *result = *it;
        return true;
    } else {
        return false;
    }
}
 
void SummaryHandlingProxyModel::Private::insertInCache( const SummaryHandlingProxyModel* model,
                                                        const QModelIndex& sourceIdx ) const
{
    QAbstractItemModel* sourceModel = model->sourceModel();
    const QModelIndex& mainIdx = sourceIdx;
    QDateTime st;
    QDateTime et;
 
    for ( int r = 0; r < sourceModel->rowCount( mainIdx ); ++r ) {
        QModelIndex pdIdx = model->mapFromSource( sourceModel->index( r, 0, mainIdx ) );
        /* The probably results in recursive calls here */
    QVariant tmpsv = model->data( pdIdx, StartTimeRole );
    QVariant tmpev = model->data( pdIdx, EndTimeRole );
    if ( !tmpsv.canConvert( QVariant::DateTime ) ||
        !tmpev.canConvert( QVariant::DateTime ) ) {
            qDebug() << "Skipping item " << sourceIdx << " because it doesn't contain QDateTime";
            continue;
        }
 
        // check for valid datetimes
        if ( tmpsv.type() == QVariant::DateTime && !tmpsv.value<QDateTime>().isValid()) continue;
        if ( tmpev.type() == QVariant::DateTime && !tmpev.value<QDateTime>().isValid()) continue;
 
    // We need to test for empty strings to
    // avoid a stupid Qt warning
    if ( tmpsv.type() == QVariant::String && tmpsv.value<QString>().isEmpty()) continue;
    if ( tmpev.type() == QVariant::String && tmpev.value<QString>().isEmpty()) continue;
        QDateTime tmpst = tmpsv.toDateTime();
        QDateTime tmpet = tmpev.toDateTime();
        if ( st.isNull() || st > tmpst ) st = tmpst;
        if ( et.isNull() || et < tmpet ) et = tmpet;
    }
    QVariant tmpssv = sourceModel->data( mainIdx, StartTimeRole );
    QVariant tmpsev = sourceModel->data( mainIdx, EndTimeRole );
    if ( tmpssv.canConvert( QVariant::DateTime )
         && !( tmpssv.canConvert( QVariant::String ) && tmpssv.toString().isEmpty() )
         && tmpssv.toDateTime() != st )
        sourceModel->setData( mainIdx, st, StartTimeRole );
    if ( tmpsev.canConvert( QVariant::DateTime )
         && !( tmpsev.canConvert( QVariant::String ) && tmpsev.toString().isEmpty() )
         && tmpsev.toDateTime() != et )
        sourceModel->setData( mainIdx, et, EndTimeRole );
    cached_summary_items[sourceIdx]=qMakePair( st, et );
}
 
void SummaryHandlingProxyModel::Private::removeFromCache( const QModelIndex& idx ) const
{
    cached_summary_items.remove( idx );
}
 
void SummaryHandlingProxyModel::Private::clearCache() const
{
    cached_summary_items.clear();
}
 
 
SummaryHandlingProxyModel::SummaryHandlingProxyModel( QObject* parent )
    : BASE( parent ), _d( new Private )
{
    init();
}
 
#define d d_func()
SummaryHandlingProxyModel::~SummaryHandlingProxyModel()
{
    delete _d;
}
 
void SummaryHandlingProxyModel::init()
{
}
 
 
void SummaryHandlingProxyModel::setSourceModel( QAbstractItemModel* model )
{
    BASE::setSourceModel( model );
    d->clearCache();
}
 
void SummaryHandlingProxyModel::sourceModelReset()
{
    d->clearCache();
    BASE::sourceModelReset();
}
 
void SummaryHandlingProxyModel::sourceLayoutChanged()
{
    d->clearCache();
    BASE::sourceLayoutChanged();
}
 
void SummaryHandlingProxyModel::sourceDataChanged( const QModelIndex& from, const QModelIndex& to )
{
    QAbstractItemModel* model = sourceModel();
    QModelIndex parentIdx = from;
    do {
        const QModelIndex& dataIdx = parentIdx;
        if ( model->data( dataIdx, ItemTypeRole )==TypeSummary ) {
            //qDebug() << "removing " << parentIdx << "from cache";
            d->removeFromCache( dataIdx );
            QModelIndex proxyDataIdx = mapFromSource( dataIdx );
            Q_EMIT dataChanged( proxyDataIdx, proxyDataIdx );
        }
    } while ( ( parentIdx=model->parent( parentIdx ) ) != QModelIndex() );
 
    BASE::sourceDataChanged( from, to );
}
 
void SummaryHandlingProxyModel::sourceColumnsAboutToBeInserted( const QModelIndex& parentIdx,
                                                                    int start,
                                                                    int end )
{
    BASE::sourceColumnsAboutToBeInserted( parentIdx, start, end );
    d->clearCache();
}
 
void SummaryHandlingProxyModel::sourceColumnsAboutToBeRemoved( const QModelIndex& parentIdx,
                                                                    int start,
                                                                    int end )
{
    BASE::sourceColumnsAboutToBeRemoved( parentIdx, start, end );
    d->clearCache();
}
 
void SummaryHandlingProxyModel::sourceRowsAboutToBeInserted( const QModelIndex & parentIdx, int start, int end )
{
    BASE::sourceRowsAboutToBeInserted( parentIdx, start, end );
    d->clearCache();
}
 
void SummaryHandlingProxyModel::sourceRowsAboutToBeRemoved( const QModelIndex & parentIdx, int start, int end )
{
    BASE::sourceRowsAboutToBeRemoved( parentIdx, start, end );
    d->clearCache();
}
 
 
Qt::ItemFlags SummaryHandlingProxyModel::flags( const QModelIndex& idx ) const
{
    const QModelIndex sidx = mapToSource( idx );
    const QAbstractItemModel* model = sourceModel();
    Qt::ItemFlags f = model->flags( sidx );
    if ( d->isSummary(sidx) ) {
        f &= ~Qt::ItemIsEditable;
    }
    return f;
}
 
 
QVariant SummaryHandlingProxyModel::data( const QModelIndex& proxyIndex, int role) const
{
  //qDebug() << "SummaryHandlingProxyModel::data("<<proxyIndex<<role<<")";
    const QModelIndex sidx = mapToSource( proxyIndex );
    const QAbstractItemModel* model = sourceModel();
    if ( d->isSummary(sidx) && ( role==StartTimeRole || role==EndTimeRole )) {
      //qDebug() << "requested summary";
        QPair<QDateTime,QDateTime> result;
        if ( d->cacheLookup( sidx, &result ) ) {
      //qDebug() << "SummaryHandlingProxyModel::data(): Looking up summary for " << proxyIndex << role;
            switch ( role ) {
            case StartTimeRole: return result.first;
            case EndTimeRole: return result.second;
            default: /* fall thru */;
            }
        } else {
            d->insertInCache( this, sidx );
            return data( proxyIndex, role ); /* TODO: Optimize */
        }
    }
    return model->data( sidx, role );
}
 
 
bool SummaryHandlingProxyModel::setData( const QModelIndex& index, const QVariant& value, int role )
{
    QAbstractItemModel* model = sourceModel();
    if ( role==StartTimeRole || role==EndTimeRole ) {
        QModelIndex parentIdx = mapToSource( index );
        do {
            if ( d->isSummary(parentIdx) ) {
          //qDebug() << "removing " << parentIdx << "from cache";
                d->removeFromCache( parentIdx );
                QModelIndex proxyParentIdx = mapFromSource( parentIdx );
                Q_EMIT dataChanged( proxyParentIdx, proxyParentIdx );
            }
        } while ( ( parentIdx=model->parent( parentIdx ) ) != QModelIndex() );
    }
    return BASE::setData( index, value, role );
}
 
#undef d
 
#ifndef KDAB_NO_UNIT_TESTS
 
#include "unittest/test.h"
 
#include <QStandardItemModel>
 
static std::ostream& operator<<( std::ostream& os, const QDateTime& dt )
{
#ifdef QT_NO_STL
    os << dt.toString().toLatin1().constData();
#else
    os << dt.toString().toStdString();
#endif
    return os;
}
 
KDAB_SCOPED_UNITTEST_SIMPLE( KGantt, SummaryHandlingProxyModel, "test" ) {
    SummaryHandlingProxyModel model;
    QStandardItemModel sourceModel;
 
    model.setSourceModel( &sourceModel );
 
    QStandardItem* topitem = new QStandardItem( QString::fromLatin1( "Summary" ) );
    topitem->setData( KGantt::TypeSummary,  KGantt::ItemTypeRole );
    sourceModel.appendRow( topitem );
 
    QStandardItem* task1 = new QStandardItem( QString::fromLatin1( "Task1" ) );
    task1->setData( KGantt::TypeTask, KGantt::ItemTypeRole );
    QStandardItem* task2 = new QStandardItem( QString::fromLatin1( "Task2" ) );
    task2->setData( KGantt::TypeTask, KGantt::ItemTypeRole );
    topitem->appendRow( task1 );
    topitem->appendRow( task2 );
 
 
    QDateTime startdt = QDateTime::currentDateTime();
    QDateTime enddt = startdt.addDays( 1 );
 
 
    task1->setData( startdt, KGantt::StartTimeRole );
    task1->setData( enddt, KGantt::EndTimeRole );
    task2->setData( startdt, KGantt::StartTimeRole );
    task2->setData( enddt, KGantt::EndTimeRole );
 
    const QModelIndex topidx = model.index( 0, 0, QModelIndex() );
 
    assertEqual( model.data( topidx, KGantt::ItemTypeRole ).toInt(), KGantt::TypeSummary );
    assertEqual( model.data( model.index( 0, 0, topidx ), KGantt::ItemTypeRole ).toInt(), KGantt::TypeTask );
 
    QDateTime task1startdt = model.data( model.index( 0, 0, topidx ), KGantt::StartTimeRole ).toDateTime();
    assertEqual( task1startdt, startdt );
 
    QDateTime summarystartdt = model.data( topidx, KGantt::StartTimeRole ).toDateTime();
    assertEqual( summarystartdt, startdt );
    assertTrue( model.flags( model.index( 0, 0, topidx ) ) & Qt::ItemIsEditable );
    assertFalse( model.flags( topidx ) & Qt::ItemIsEditable );
}
 
#endif /* KDAB_NO_UNIT_TESTS */
 
#include "moc_kganttsummaryhandlingproxymodel.cpp"