QTableView not refreshing

[steg90]

Hi,

I'm using my own model derived from QAbstractTableModel. My class looks something like :

class DATreeModel : public QAbstractTableModel
{
	Q_OBJECT
 
public:
	DATreeModel(const QStringList &strings, QObject *parent = 0)
         : QAbstractTableModel(parent), stringList(strings) {}
 
	DATreeModel(QObject *parent = 0);
	~DATreeModel();
 
	int rowCount(const QModelIndex &parent = QModelIndex()) const;
	int columnCount(const QModelIndex &) const;
	QVariant data(const QModelIndex &index, int role) const;
	QVariant headerData(int section, Qt::Orientation orientation, int role) const;
	void setCanData( const QString& strData );
	void SetHeaders( QStringList& strHeaders );
 
private:
	QStringList stringList;
	QList<QString> m_Data;
	QStringList strHeaderList;
};

class DATreeModel : public QAbstractTableModel
{
	Q_OBJECT

public:
	DATreeModel(const QStringList &strings, QObject *parent = 0)
         : QAbstractTableModel(parent), stringList(strings) {}

	DATreeModel(QObject *parent = 0);
	~DATreeModel();

	int rowCount(const QModelIndex &parent = QModelIndex()) const;
	int columnCount(const QModelIndex &) const;
	QVariant data(const QModelIndex &index, int role) const;
	QVariant headerData(int section, Qt::Orientation orientation, int role) const;
	void setCanData( const QString& strData );
	void SetHeaders( QStringList& strHeaders );

private:
	QStringList stringList;
	QList<QString> m_Data;
	QStringList strHeaderList;
};

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This model is just read only so no need to override setData. Now the following snippet of code is used to set the data :

QVariant DATreeModel::data( const QModelIndex& index, int role) const
{
	QVariant data;
 
	if (!index.isValid())
		return QVariant();
 
 
	if (index.row() > (m_Data.size() / 4) )
	{
		return QVariant();
	}
 
	if(index.column() > 3 )
	{
		return QVariant();
	}
 
	if( role == Qt::DisplayRole )
	{
		// just return data at given column
		int nPos = index.column() + ( 4 * index.row() );
		if( nPos < m_Data.size() )
			data = m_Data.at( nPos );
 
	}
 
	return data;
}

QVariant DATreeModel::data( const QModelIndex& index, int role) const
{
	QVariant data;
	
	if (!index.isValid())
		return QVariant();


	if (index.row() > (m_Data.size() / 4) )
	{
		return QVariant();
	}

	if(index.column() > 3 )
	{
		return QVariant();
	}

	if( role == Qt::DisplayRole )
	{
		// just return data at given column
		int nPos = index.column() + ( 4 * index.row() );
		if( nPos < m_Data.size() )
			data = m_Data.at( nPos );
	
	}

	return data;
}

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And the following is used to insert new data :

void DATreeModel::setCanData( const QString& strData )
{
	m_Data.append(strData);
	QModelIndex nindex = index(m_Data.size(),0);;
	emit dataChanged(nindex, nindex );
}

void DATreeModel::setCanData( const QString& strData )
{
	m_Data.append(strData);
	QModelIndex nindex = index(m_Data.size(),0);;
	emit dataChanged(nindex, nindex );
}

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Alas, the table view is not 'refreshed' unless I click on the cells within it, I thought this would be automatic?

Any help would be much appreciated.

Steve

[jpn]

Alas, the table view is not 'refreshed' unless I click on the cells within it, I thought this would be automatic?

Make the model aware of the insertion with:

• QAbstractItemModel::beginInsertRows()
• QAbstractItemModel::endInsertRows()

[steg90]

Thanks,

Do I need to implement these functions in my model?

Regards,
Steve

[steg90]

Hi again,

I've now done this, thanks JPN

[wysota]

An alternative is to emit layoutChanged() after inserting new data.