beginInsertRows doesn't appear to be working?

[jpn]

Does DATreeModel::setCanData() get called only once or many times? I think you might be looking for something like this:

void DATreeModel::setCanData( CANDATA *pData, int nAmount, int nCount )
{
    if( pData )
    {
        int row = rowCount();
        beginInsertRows(QModelIndex(), row, row + nAmount - 1);
        ...
        endInsertRows();
    }
}

void DATreeModel::setCanData( CANDATA *pData, int nAmount, int nCount )
{
    if( pData )
    {
        int row = rowCount();
        beginInsertRows(QModelIndex(), row, row + nAmount - 1);
        ...
        endInsertRows();
    }
}

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[steg90]

Hi,

setCanData() gets called over and over again from another thread. I tried what you suggested and still the data is not displayed until I click on the table view, also, the rowCount() function still not updating the tableview row amount?

Unless I do something like return 10000 or whatever from the rowCount function, no rows are inserted, I thought rowCount() would do this for you?

Kind regards,
Steve

[steg90]

I'm still struggling with this, the rowCount returns the amount of rows, but the view doesn't reflect this?

Also, QModelIndex() seems to have invalid row and column values in my beginInsertRows...

Can't believe how difficult this is proving for something so trivial!

Regards,
Steve

[wysota]

You can't do it from another thread. Containers are not thread safe. You can only emit a signal from the other thread and catch it in the model and update the model from within the main thread.

[steg90]

Sorry, the worker thread just reads data and emits a signal to main gui thread which then informs the model to update its data. The code below shows the code within the main gui which informs the model of the change with the setCanData function:

if( m_pCanReadThread->isRunning() )  // user may have stopped thread
	{
		if( nCount < 8000 )
		{
			m_ptreeModel->setCanData( pData, nAmount, nCount  );
			QModelIndex index = m_ptreeModel->index( nCount, 0 );
			ui.tableView->scrollTo( index );
		}
		else
		{
			m_pCanReadThread->cancelThread();
		}
	}

if( m_pCanReadThread->isRunning() )  // user may have stopped thread
	{
		if( nCount < 8000 )
		{
			m_ptreeModel->setCanData( pData, nAmount, nCount  );
			QModelIndex index = m_ptreeModel->index( nCount, 0 );
			ui.tableView->scrollTo( index );
		}
		else
		{
			m_pCanReadThread->cancelThread();
		}
	}

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Regards,
Steve

[wysota]

As a little check emit layoutChanged() at the end of setCanData(). If it makes it work, it means that you have something wrong in your model and using the Modeltest might be a good idea.

[steg90]

Hi,

emit layoutChanged() doesn't have any effect. Still not refreshing the view nor are the rows being inserted.

The only way I can get this to work is to set the row count to a big size right at the begining and click on the table view to get the items to appear, very, very strange and totally not acceptable. Obviously when the table has to scroll, the items appear. One thing I have noticed is that the items in the first column of the table always appear?

Regards,
Steve