void TestQgsFields::toList()
{
QgsFields fields;
QList<QgsField> list = fields.toList();
QVERIFY( list.isEmpty() );
QgsField field( QString( "testfield" ) );
fields.append( field );
QgsField field2( QString( "testfield2" ) );
fields.append( field2 );
QgsField field3( QString( "testfield3" ) );
fields.append( field3 );
list = fields.toList();
QCOMPARE( list.at( 0 ), field );
QCOMPARE( list.at( 1 ), field2 );
QCOMPARE( list.at( 2 ), field3 );
}
void QgsFieldModel::updateModel()
{
if ( mLayer )
{
QgsFields newFields = mLayer->fields();
if ( mFields.toList() != newFields.toList() )
{
// Try to handle two special cases: addition of a new field and removal of a field.
// It would be better to listen directly to attributeAdded/attributeDeleted
// so we would not have to check for addition/removal here.
if ( mFields.count() == newFields.count() - 1 )
{
QgsFields tmpNewFields = newFields;
tmpNewFields.remove( tmpNewFields.count() - 1 );
if ( mFields.toList() == tmpNewFields.toList() )
{
// the only change is a new field at the end
beginInsertRows( QModelIndex(), mFields.count(), mFields.count() );
mFields = newFields;
endInsertRows();
return;
}
}
if ( mFields.count() == newFields.count() + 1 )
{
QgsFields tmpOldFields = mFields;
tmpOldFields.remove( tmpOldFields.count() - 1 );
if ( tmpOldFields.toList() == newFields.toList() )
{
// the only change is a field removed at the end
beginRemoveRows( QModelIndex(), mFields.count() - 1, mFields.count() - 1 );
mFields = newFields;
endRemoveRows();
return;
}
for ( int i = 0; i < newFields.count(); ++i )
{
if ( mFields.at( i ) != newFields.at( i ) )
{
QgsFields tmpOldFields = mFields;
tmpOldFields.remove( i );
if ( tmpOldFields.toList() != newFields.toList() )
break; // the change is more complex - go with general case
// the only change is a field removed at index i
beginRemoveRows( QModelIndex(), i, i );
mFields = newFields;
endRemoveRows();
return;
}
}
}
// general case with reset - not good - resets selections
beginResetModel();
mFields = mLayer->fields();
endResetModel();
}
else
emit dataChanged( index( 0, 0 ), index( rowCount(), 0 ) );
}
else
{
beginResetModel();
mFields = QgsFields();
endResetModel();
}
}
