[Solved] QAbstractTableModel rowsInserted (const QModelIndex & parent, int start, int end) signal
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[quote author="ZapB" date="1304519890"]Andre, not in the implementation no.[/quote]
"D'oh":http://en.wikipedia.org/wiki/D'oh! !
Of course not.ZabB is absolutely right.
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To answer your question ZapB I am using v2.1.0 (Qt 4.7.1) 32 bit on Windows Vista x64
Also now I have my signal connected I don't get notification of any rows being added!
I have changed the code to this:
@
if (m_Model)
{
if (connect(m_Model, SIGNAL(rowsInserted(const QModelIndex &, int, int)), this, SLOT(modelRowsInserted(QModelIndex, int, int))))
{
// Load model from file.
if (m_Model->load("./input.xml"))
{
// Assign the model to the view
ui->myModelView->setModel(m_Model);
}
}
}
@With my slot being:
@
void MainWindow::modelRowsInserted ( const QModelIndex & parent, int start, int end )
{
qDebug() << "Rows Added to Model" ;
}
@But I never see any output in the Application Output console even though my model correctly displays the (processed) content of the input file. In this instance I would have expected to see two lines in the output console based on the content of the file and what is correctly displayed in the View.
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William -
Hi,
Well I cannot see what else I am missing as as far as I can tell I have no need to re-implement anything other than those already listed as this is a read only model. I am relying on (my assumption) that this signal will (should) get emitted (via the default implementation) when a new row is inserted.
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William -
Hi William,
who should add rows that emit this signal?
If you change the content of the model, you have to call the defined methods, like begine/end insert Rows/columns. Same for remove.
Without calling these, the signals will not be emitted.EDIT: I assume, the content of your model is static? Or is it dynamic? if it is dynamic, the model is responsible for notifying the clients.
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Read-only model means read-only as far as the QAbstractItemModel's interface is concerned. ie an attached view will not allow users to edit the model. However, you are still changing the model when you load your data and so you need to call beginInsertRows() and endInsertRows() around the place where you modify your underlying data structure. It is the call to endInsertRows() that causes your missing signal to be emitted. How else would the model know what you are doing behind it's back?
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No worries. I remember the pains of learning the modelview architecture. It can be confusing. The trick is to remember that QAbstractItemModel is only an interface to your data that us used by the views. You have to nudge it it the right direction when you change your data behind it's back by calling the appropriate protected functions.
Good luck with the rest of your project!