QTableView rowCount(), setRowCount(), setItem()

WhatIf

Hi,

QTableView doesn't seem to have rowCount(), setRowCount() or setItem(). I was following the code from this post to add rows to QTableView:

http://www.qtcentre.org/threads/24755-How-to-add-data-into-the-QTableWidget

I get 4 different errors:

error: 'class QTableView' has no member named 'rowCount'
error: 'class QTableView' has no member named 'setRowCount'
error: 'class QTableView' has no member named 'setItem'
error: expected type-specifier before 'QTableWidgetItem'

I searched online to find a solution but the post that has the solution to at the least 3 member functions has broken links:

https://forum.qt.io/topic/10708/solved-rowcount-tableview/3

Would greatly appreciate your assistance!

mrjj

hi
the forum post pointed to these
http://doc.qt.io/qt-5/qabstractitemview.html#model
http://doc.qt.io/qt-5/qabstractitemmodel.html#rowCount

so basically, ask for the model, use the models rowcount

WhatIf

Here is what I did:

const int currentRow = ui->statisticsTableView->model()->rowCount();
ui->statisticsTableView->model()->setRowCount(currentRow + 1);
ui->statisticsTableView->model()->setItem(currentRow, 0, new QTableWidgetItem(ui->statisticsTableView->itemText(i)));
ui->statisticsTableView->model()->setItem(currentRow, 1, new QTableWidgetItem(getNextStats()));

I'm getting the following 3 error:

error: 'class QAbstractItemModel' has no member named 'setRowCount'
error: 'class QAbstractItemModel' has no member named 'setItem'
error: expected type-specifier before 'QTableWidgetItem'

mrjj

@WhatIf said:

Hi, you might need to cast it to the correct model type

QStandardItemModel has the function
http://doc.qt.io/qt-5/qstandarditemmodel.html#setItem

so u need to check doc and cast if not in
QAbstractItemModel

the model() return a base class model, NOT the type of the actual model.
so if you need methods from model subclasses, u might need to cast.

SGaist

Hi,

To add to @mrjj, QTableWidgetItem is a class to be used with QTableWidget not QTableView.

WhatIf

One last question, all I'm trying to accomplish is display some statistics, 2 column and many rows. Should I use QTableWidget instead?

The Docs have snippets code to help get me start. But I'm not really sure if having a default model from QTableWidget helps or hurts in my case.

SGaist

How many rows are we talking about here ?

How fast do you want to update them ?

WhatIf

Right now, 12 rows but might grow to 100 max. Which is faster and how much faster?

SGaist

For that kind of volume QTableWidget is enough.

For speed answers, you'll have to benchmark for your target.

VRonin

If you really want to understand what's going on see http://doc.qt.io/qt-5/model-view-programming.html and/or chapter 10 of this book http://www.bogotobogo.com/cplusplus/files/c-gui-programming-with-qt-4-2ndedition.pdf