QTreeView and QStandardModel : add children

[wysota]

How do you expect to use them if they are not initialised?

[Valheru]

What should I initialize them to then? I´m sorry, but I´m new to the model/view way of doing this and am just happy that it´s working at all The docs themselves are rather vague on this subject as well I find

[wysota]

What should I initialize them to then?

I don't know. It is you who used them. Didn't you know what you needed them for?

The docs themselves are rather vague on this subject as well I find

Hmm.... Maybe you didn't look well enough...

An example usage of QStandardItemModel to create a tree:

QStandardItemModel *model = new QStandardItemModel();
QModelIndex parent;
for (int i = 0; i < 4; ++i) {
    parent = model->index(0, 0, parent);
    model->insertRows(0, 1, parent);
    model->insertColumns(0, 1, parent);
    QModelIndex index = model->index(0, 0, parent);
    model->setData(index, i);
}

QStandardItemModel *model = new QStandardItemModel();
QModelIndex parent;
for (int i = 0; i < 4; ++i) {
    parent = model->index(0, 0, parent);
    model->insertRows(0, 1, parent);
    model->insertColumns(0, 1, parent);
    QModelIndex index = model->index(0, 0, parent);
    model->setData(index, i);
}

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It creates a cascade of 4 elements. If you want to have a two level tree you should modify the code a little, so that the parent index doesn't get changed at each iteration:

QStandardItemModel *model = new QStandardItemModel();
int parentrow = 2; // top level row number you wish to create offsprings for
QStringList connectionData;
connectionData << "Con1" << "Con2" << "Con3" << "Con4";
QModelIndex parent = model->index(parentrow, 0);
model->insertColumns(0, 1, parent); // this creates a single column for children of the item
for (int i = 0; i < connectionData.size(); ++i) {
    model->insertRows(0, 1, parent);
    QModelIndex index = model->index(i, 0, parent);
    model->setData(index, connectionData[i]);
}

QStandardItemModel *model = new QStandardItemModel();
int parentrow = 2; // top level row number you wish to create offsprings for
QStringList connectionData;
connectionData << "Con1" << "Con2" << "Con3" << "Con4";
QModelIndex parent = model->index(parentrow, 0);
model->insertColumns(0, 1, parent); // this creates a single column for children of the item
for (int i = 0; i < connectionData.size(); ++i) {
    model->insertRows(0, 1, parent);
    QModelIndex index = model->index(i, 0, parent);
    model->setData(index, connectionData[i]);
}

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[jpn]

Go through and try to understand the following code:

void ServerList::addItem( const QString &hostName, quint16 port, const QString& username,
						 const QString& password, quint16 timeout, quint16 numberConnections )
{
	// first, insert a top level row
	int rows = model()->rowCount();
	model()->insertRow( rows );
 
	// set host name to the index in the first 
	// column of the newly inserted row
	QModelIndex parent = model()->index( rows, 0 );
	model()->setData( parent, hostName );
 
	//Server ns( hostName, port, username, password, timeout, numberConnections );
	//server.append( ns );
 
	// add a column and enough rows for connection children
	// the parent is the parent we just inserted above
	model()->insertColumn( 0, parent );						// one column for children
	rows = model()->rowCount( parent );
	model()->insertRows( rows, numberConnections, parent );	// one row for each child
 
	// set connection names for each children
	for ( int x = 0; x < numberConnections; x++ )
	{
		QModelIndex child = model()->index( x, 0, parent );		// all connections are under the same parent
																// which is, again, the same parent we
																// inserted in the first place
		model()->setData( child, QString("Connection #%1").arg( x + 1 ) );
	}
}

void ServerList::addItem( const QString &hostName, quint16 port, const QString& username,
						 const QString& password, quint16 timeout, quint16 numberConnections )
{
	// first, insert a top level row
	int rows = model()->rowCount();
	model()->insertRow( rows );

	// set host name to the index in the first 
	// column of the newly inserted row
	QModelIndex parent = model()->index( rows, 0 );
	model()->setData( parent, hostName );

	//Server ns( hostName, port, username, password, timeout, numberConnections );
	//server.append( ns );

	// add a column and enough rows for connection children
	// the parent is the parent we just inserted above
	model()->insertColumn( 0, parent );						// one column for children
	rows = model()->rowCount( parent );
	model()->insertRows( rows, numberConnections, parent );	// one row for each child

	// set connection names for each children
	for ( int x = 0; x < numberConnections; x++ )
	{
		QModelIndex child = model()->index( x, 0, parent );		// all connections are under the same parent
																// which is, again, the same parent we
																// inserted in the first place
		model()->setData( child, QString("Connection #%1").arg( x + 1 ) );
	}
}

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[Valheru]

Thanks, that works perfectly. I'm now just trying to puzzle out why